Dissertations / Theses on the topic 'Carangids'

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A espécie Carangoides bartholomaei, conhecida vulgarmente como guarajuba, pertence à família Carangidae, a qual apresenta alguns dos peixes mais importantes para comercialização. Os indivíduos desta espécie possuem distribuição de Massachussetts (EUA) a São Paulo (Brasil), abrangendo toda a plataforma continental. O presente trabalho teve como objetivo analisar os aspectos biológicos da reprodução e alimentação da guarajuba na plataforma continental de Pernambuco. Os 87 indivíduos amostrados, variando de 24,1 a 43,6 cm de comprimento total, foram capturados com rede de espera demersal de malha entre - nós de 40 mm, com aproximadamente 20 m de comprimento e 2 m de altura. Os peixes foram coletados mensalmente, de janeiro de 2009 a março de 2010, após o desembarque do pescado, na comunidade pesqueira de Brasília Teimosa, em Recife. Para cada amostragem, os indivíduos foram submetidos à biometria, sendo mensurados o comprimento total (CT), o comprimento furcal (CF) e o comprimento padrão (CP), medidos em centímetros (± 0,1 cm); o peso total (PT), o peso da gônada (PG), e o peso do estômago (PE), medidos em gramas (± 0,01g). As gônadas foram fixadas em formaldeído 10% e os estômagos fixados internamente com formaldeído a 4% e, externamente, em formaldeído a 10%. Para a análise da reprodução foram determinadas: as proporções sexuais; a frequência relativa dos estádios maturacionais das fêmeas; o índice gonadossomático (IGS); o fator de condição alométrico; o tamanho de primeira maturação sexual (L50); e a fecundidade total das fêmeas. Para a análise da alimentação foram determinados: o grau de repleção (GR); o grau de digestão (GD); o índice de importância alimentar (IAi); as variações na dieta por sexo, meses e classes de comprimento; e o hábito alimentar. A proporção F:M para o total de indivíduos foi 1:0,58. Microscopicamente as gônadas foram classificadas em imatura, em maturação, matura, desovada e em repouso. O período de desova foi longo, ocorrendo do início do período seco até o início do período chuvoso. A relação peso-comprimento para fêmeas e machos foi significativa, com alometria negativa. O L50 foi de 30 cm de CT para as fêmeas. De acordo com o grau e índice de repleção estomacal e grau de digestão das presas, C. bartholomaei apresentou estômagos com maior quantidade de alimento no período chuvoso, enquanto que, no período seco, os conteúdos estomacais se encontravam mais digeridos. A categoria Actinopterygii apresentou maior contribuição no período chuvoso e entre os indivíduos maiores enquanto que Matéria Orgânica Animal e Decapoda foram mais consumidas no período seco e por indivíduos menores. A espécie caracterizou-se por ingerir principalmente Actinopterygii (IAi% = 51,1), tendo Decapoda (IAi% = 3,8) como categoria acessória na dieta. A espécie, bem como a maioria dos indivíduos da família Carangidae, pode ser considerada carnívora pscívora, com dieta variando entre os sexos e de acordo com os estágios reprodutivos, o que se torna uma estratégia para obter sucesso na reprodução.

This thesis had two overriding aims. The first was to describe the biology of Samson Fish Seriola hippos and therefore extend the knowledge and understanding of the genus Seriola. The second was to uses these data to develop strategies to better manage the fishery and, if appropriate, develop catch-and-release protocols for the S. hippos sportfishery. Trends exhibited by marginal increment analysis in the opaque zones of sectioned S. hippos otoliths, together with an otolith of a recaptured calcein injected fish, demonstrated that these opaque zones represent annual features. Thus, as with some other members of the genus, the number of opaque zones in sectioned otoliths of S. hippos are appropriate for determining age and growth parameters of this species. Seriola hippos displayed similar growth trajectories to other members of the genus. Early growth in S. hippos is rapid with this species reaching minimum legal length for retention (MML) of 600mm TL within the second year of life. After the first 5 years of life growth rates of each sex differ, with females growing faster and reaching a larger size at age than males. Thus, by 10, 15 and 20 years of age, the predicted fork lengths (and weights) for females were 1088 (17 kg), 1221 (24 kg) and 1311 mm (30 kg), respectively, compared with 1035 (15 kg), 1124 (19 kg) and 1167 mm (21 kg), respectively for males. Despite these differences, female and male S. hippos attained similar maximum age, i.e. 29 (1470 mm FL) and 28 years (1280 mm FL), respectively. The maximum age determined for S. hippos is greater than that recorded for any other Seriola spp. The largest female and male S. hippos recorded during this study were encountered during the tagging component and had fork lengths of 1600 mm and 1380 mm, respectively. Seriola hippos has a protracted spawning period, ca four months, which starts in late spring and continues through summer into early autumn during which time many individuals engage in large spawning aggregations on the lower west coast of Australia. The length at which 50 % of the females in the population reached maturity was 831 mm FL (888 mm TL) and approximately 4 years of age, whilst all females over 950 mm FL were mature. Whilst aggregated for spawning S. hippos ceases feeding, however, during the non-spawning period this species can best be described as an opportunistic carnivore which feeds on a variety of pelagic and demersal prey. This study has greatly increased our understanding of S. hippos movement on the west and south coasts of Australia and has documented, for the first time, the migratory behaviour of a carangid in these waters. Many S. hippos individuals undertake long distance migrations to join spawning aggregation sites near Rottnest Island. Individuals tagged at these aggregation sites where recaptured throughout this species distribution along the south coast of Australia, some after travelling distances of over 2400 km. Many S. hippos individuals displayed strong temporal and spatial spawning ground fidelity as numerous fish released at the spawning aggregations were recaptured at the exact same spawning site at similar times in subsequent years. Tagging data suggest that on the completion of spawning S. hippos individuals return to a resident location and remain in that general vicinity over the winter months. This study has developed a hypothesis describing larval dispersal associated with the S. hippos spawning behaviour exhibited near Rottnest Island. It is proposed that variations in the prevailing ocean currents, at this important spawning location throughout the protracted spawning period, leads to high intra and inter-annual variation in larval distribution and survival. The affect of this variation on the evolution of the spawning and migratory behaviour displayed by S. hippos is discussed. A recent increase in the popularity of S. hippos as a catch-and-release sportfish has led to concerns by some anglers about post release survival of this species, particularly due to the depth of capture. Short term mortality of S. hippos capture at the sportfishing sites was assessed by monitoring fish held within an enclosure near the site of capture for up to 31 hours post release. The total hooking mortality of S. hippos subjected to catch-and-release angling within the Rottnest Island sportfishery is approximately 8%. Most of this observed mortality is delayed and occurs sometime after release. Although best handling practises require ongoing development, the current level of mortality associated with this catch-and-release fishery is considered acceptable. Furthermore, this mortality is likely to have little effect on the S. hippos population due to the high abundance of this species and the fact that even the highest fishing effort yields a relatively low catch. Seriola hippos exhibits a typical teleost neuroendocrine stress response associated with catch-and-release. The physiological dysfunction associated with the stress of capture in this species does not appear to cause any post release mortality. Instead, most mortality was attributable to barotrauma, however, although mortality in S. hippos increases with capture depth, this species is much less susceptible to depth induced mortality than other commonly targeted species in which barotrauma has been observed. This study developed key handling protocols for fishers who catch-and-release S. hippos at the Rottnest Island aggregation sites. These protocols cover aspects of catch-and-release fishing such as hook type, water depth, time at surface, release method and shark predation. Almost all S. hippos observed during capture from deep water released large quantities of gas from the opercular region, particularly during the last 10 to 20 m before reaching the surface. This phenomenon has also been witnessed by divers and fishers to occur under natural conditions. Investigations into this release of gas revealed this physoclistous species to exhibit unique swim bladder characteristics. Seriola hippos possess a membranous tube that connects the posterior-dorsal surface of the swim bladder internally to a region under each operculum externally. This connection, termed the swim bladder vent, allows the escape of expanding swim bladder gases on rapid ascent. The presence of the swim bladder vent provides an explanation as to why the incidence of external barotrauma symptoms in S. hippos captured from the deepwater was low. The ability to expel excess swim bladder gases during rapid ascent whilst retaining full swim bladder function is likely to offer this semi-pelagic species considerable advantages when hunting prey, avoiding predators and engaging in spawning activities. Preliminary estimates of total mortality indicated that S. hippos is not currently subjected to a high level of fishing pressure. However, managers must remain mindful of the fact that the size at which females reach sexual maturity, i.e. 888 mm TL, is greater than the current minimum legal length, i.e. 600 mm, and thus fishers are currently allowed to harvest sexually immature fish. Furthermore, the effectiveness of future conservation measures must consider the large scale migration and spawning strategy undertaken by this species in order to ensure its protection. The collaborative research approach undertaken during this study demonstrated that a high level of community engagement produced a large amount of research interest, increased stakeholder satisfaction from project input, improved understanding of research outcomes, and increased research uptake, all of which has led to increased stewardship and conservation of the S. hippos fishery and fisheries resources in general. Indeed, projects of this nature would not be possible without this type of approach.

This thesis had two overriding aims. The first was to describe the biology of Samson Fish Seriola hippos and therefore extend the knowledge and understanding of the genus Seriola. The second was to uses these data to develop strategies to better manage the fishery and, if appropriate, develop catch-and-release protocols for the S. hippos sportfishery. Trends exhibited by marginal increment analysis in the opaque zones of sectioned S. hippos otoliths, together with an otolith of a recaptured calcein injected fish, demonstrated that these opaque zones represent annual features. Thus, as with some other members of the genus, the number of opaque zones in sectioned otoliths of S. hippos are appropriate for determining age and growth parameters of this species. Seriola hippos displayed similar growth trajectories to other members of the genus. Early growth in S. hippos is rapid with this species reaching minimum legal length for retention (MML) of 600mm TL within the second year of life. After the first 5 years of life growth rates of each sex differ, with females growing faster and reaching a larger size at age than males. Thus, by 10, 15 and 20 years of age, the predicted fork lengths (and weights) for females were 1088 (17 kg), 1221 (24 kg) and 1311 mm (30 kg), respectively, compared with 1035 (15 kg), 1124 (19 kg) and 1167 mm (21 kg), respectively for males. Despite these differences, female and male S. hippos attained similar maximum age, i.e. 29 (1470 mm FL) and 28 years (1280 mm FL), respectively. The maximum age determined for S. hippos is greater than that recorded for any other Seriola spp. The largest female and male S. hippos recorded during this study were encountered during the tagging component and had fork lengths of 1600 mm and 1380 mm, respectively. Seriola hippos has a protracted spawning period, ca four months, which starts in late spring and continues through summer into early autumn during which time many individuals engage in large spawning aggregations on the lower west coast of Australia. The length at which 50 % of the females in the population reached maturity was 831 mm FL (888 mm TL) and approximately 4 years of age, whilst all females over 950 mm FL were mature. Whilst aggregated for spawning S. hippos ceases feeding, however, during the non-spawning period this species can best be described as an opportunistic carnivore which feeds on a variety of pelagic and demersal prey. This study has greatly increased our understanding of S. hippos movement on the west and south coasts of Australia and has documented, for the first time, the migratory behaviour of a carangid in these waters. Many S. hippos individuals undertake long distance migrations to join spawning aggregation sites near Rottnest Island. Individuals tagged at these aggregation sites where recaptured throughout this species distribution along the south coast of Australia, some after travelling distances of over 2400 km. Many S. hippos individuals displayed strong temporal and spatial spawning ground fidelity as numerous fish released at the spawning aggregations were recaptured at the exact same spawning site at similar times in subsequent years. Tagging data suggest that on the completion of spawning S. hippos individuals return to a resident location and remain in that general vicinity over the winter months. This study has developed a hypothesis describing larval dispersal associated with the S. hippos spawning behaviour exhibited near Rottnest Island. It is proposed that variations in the prevailing ocean currents, at this important spawning location throughout the protracted spawning period, leads to high intra and inter-annual variation in larval distribution and survival. The affect of this variation on the evolution of the spawning and migratory behaviour displayed by S. hippos is discussed. A recent increase in the popularity of S. hippos as a catch-and-release sportfish has led to concerns by some anglers about post release survival of this species, particularly due to the depth of capture. Short term mortality of S. hippos capture at the sportfishing sites was assessed by monitoring fish held within an enclosure near the site of capture for up to 31 hours post release. The total hooking mortality of S. hippos subjected to catch-and-release angling within the Rottnest Island sportfishery is approximately 8%. Most of this observed mortality is delayed and occurs sometime after release. Although best handling practises require ongoing development, the current level of mortality associated with this catch-and-release fishery is considered acceptable. Furthermore, this mortality is likely to have little effect on the S. hippos population due to the high abundance of this species and the fact that even the highest fishing effort yields a relatively low catch. Seriola hippos exhibits a typical teleost neuroendocrine stress response associated with catch-and-release. The physiological dysfunction associated with the stress of capture in this species does not appear to cause any post release mortality. Instead, most mortality was attributable to barotrauma, however, although mortality in S. hippos increases with capture depth, this species is much less susceptible to depth induced mortality than other commonly targeted species in which barotrauma has been observed. This study developed key handling protocols for fishers who catch-and-release S. hippos at the Rottnest Island aggregation sites. These protocols cover aspects of catch-and-release fishing such as hook type, water depth, time at surface, release method and shark predation. Almost all S. hippos observed during capture from deep water released large quantities of gas from the opercular region, particularly during the last 10 to 20 m before reaching the surface. This phenomenon has also been witnessed by divers and fishers to occur under natural conditions. Investigations into this release of gas revealed this physoclistous species to exhibit unique swim bladder characteristics. Seriola hippos possess a membranous tube that connects the posterior-dorsal surface of the swim bladder internally to a region under each operculum externally. This connection, termed the swim bladder vent, allows the escape of expanding swim bladder gases on rapid ascent. The presence of the swim bladder vent provides an explanation as to why the incidence of external barotrauma symptoms in S. hippos captured from the deepwater was low. The ability to expel excess swim bladder gases during rapid ascent whilst retaining full swim bladder function is likely to offer this semi-pelagic species considerable advantages when hunting prey, avoiding predators and engaging in spawning activities. Preliminary estimates of total mortality indicated that S. hippos is not currently subjected to a high level of fishing pressure. However, managers must remain mindful of the fact that the size at which females reach sexual maturity, i.e. 888 mm TL, is greater than the current minimum legal length, i.e. 600 mm, and thus fishers are currently allowed to harvest sexually immature fish. Furthermore, the effectiveness of future conservation measures must consider the large scale migration and spawning strategy undertaken by this species in order to ensure its protection. The collaborative research approach undertaken during this study demonstrated that a high level of community engagement produced a large amount of research interest, increased stakeholder satisfaction from project input, improved understanding of research outcomes, and increased research uptake, all of which has led to increased stewardship and conservation of the S. hippos fishery and fisheries resources in general. Indeed, projects of this nature would not be possible without this type of approach.

Three stocks of the Cape horse mackerel, Trachurus trachurus capensis, have been recognised in the ICSEAF convention region off southern Africa (Figure 1) on the basis of catch distribution and biological analyses. They were identified as being off Namibia (ICSEAF Divisions 1 . 3 and 1.4), off the West Coast of South Africa (Div. 1.6) and off the South Coast (Div. 2.1 and 2.2). Recently, speculation as to the accuracy of the classification of the South African populations has arisen. The aim of this study was to determine the number of stocks In Divisions 1.6, 2.1 and 2.2, using methodology which assessed the spatial and temporal nature and the phenotypic and genotypic characteristics of the species. The distribution of horse mackerel was evaluated by studying the trends in catch data and length frequency distributions obtained from the demersal industry during 1986 to 1988 and from the demersal biomass cruises in 1987 and 1988. Adult fish, found in Div. 2.1 and 2.2, probably migrated; during the months in which horse mackerel were expected to spawn, CPUE values were higher over the central Agulhas Bank than in the east of the study region. During the quiescent period, catches and numbers were higher in the latter region. Juvenile horse mackerel were found in the nursery areas utilised by pelagic fish and it is likely that they were transported northward from the Agulhas Bank. A decrease in biomass of individuals in Div. 1.5 indicated a separation between a northern and a southern population. Analyses of the phenotype, or epigenetic characters, of horse mackerel were used as a further test of stock integrity. Monthly samples were drawn from Div. 1.6, 2.1 and 2.2 during May 1988 to June, 1989. Comparisons for the values obtained from growth, length-at-50%-maturity and the season of otolith ring formation from each region showed no significant variation in the phenotype. Morphometric analysis proved inconclusive. Monthly gonadosomatic indices show that fish south of the Orange River share the same spawning season. Reports from the literature show that horse mackerel in the latter region differ from those of northern Namibia in spawning season, age-at-50%-maturity and season of otolith ring formation. The genetic structure of the populations of horse mackerel was evaluated by means of a restriction enzyme analysis of the Mitochondrial DNA of 37 fish collected from Divisions 1.4, 1.5, 1.6, 2.1 and 2.2. Two composite genotypes of horse mackerel were found; one belonging to fish in Div. 1.4 and one to fish in Div. 1.6, 2.1 and 2.2. The genetic distance between the two genotypes, 0.07, was the expected distance between two populations at a subspecies level. Fish in Div. 1.5 consisted of both genotypes and may be a region of mixing between the two populations. The interpretation of results was cautioned; prevlous work has shown that the migration of a small number of individuals between two stocks can be expected to maintain a low variation between the populations. In concluding, it was recommended that the horse mackerel be managed as two stocks, one in Div. 1.3 and 1.4 and one in Div. 1.6, 2.1 and 2.2

A família Carangidae Rafinesque 1815 (Teleostei: Percomorphacea: Carangiformes) é tradicionalmente reconhecida como um grupo monofilético, tanto em hipóteses baseadas em dados moleculares quanto morfológicos. O monofiletismo do grupo, entretanto, é sustentado por um baixo número de sinapomorfias e suas relações internas ainda apresentam conflitos. O status filético e inter-relações das tribos Trachinotini,Scomberoidini, Naucratini e Caranginivariam de acordo com autores e metodologias empregadas na reconstrução evolutiva da família. As propostas morfológicas mais recentes para os Carangidae datam de 30 anos atrás e empregam maciçamente dados de morfologia externa e osteologia, sendo a miologia do grupo praticamente inexplorada. O presente estudo analisou extensamente a miologia facial, gular e das nadadeiras peitorais, pélvicas e caudal dos Carangidae e grupos proximamente relacionados. Novos caracteres de origem miológica foram levantados e analisados sob um paradigma cladístico em conjunto com os demais caracteres morfológicos disponíveis na literatura especializada. Uma nova hipótese filogenética foi proposta e comparada com as disponíveis, tanto baseadas em dados morfológicos como moleculares. Os novos dados miológicos reforçam as hipóteses de monofiletismo das tribos de Carangidae, bem como a presença de dois grandes clados irmãos, um formado por Trachinotinie Scomberoidinie outro por Caranginie Naucratini. O estudo da musculatura também forneceu pistas sobre o posicionamento do historicamente problemático gênero Parastromateus dentro de Carangini. Além disso, a descrição de complexos musculares nunca antes estudados forneceu dados sobre o a evolução de músculos considerados erráticos em Percomorphacea e que podem contribuir para o entendimento das inter-relações deste grande grupo.
The Carangidae Rafinesque 1815 (Teleostei: Percomorphacea: Carangiformes) is traditionally recognized as a monophyletic group in both morphological and molecular hypotheses. The monophyly of the family, however, is supported by a surprisingly low number of synapomorphies and the internal resolution of the group is contentious. The phyletic status and interrelationships of the tribes Trachinotini, Scomberoidini, Naucratini, and Carangini vary across different studies. The most recent morphological hypothesis for carangids dates back to 30 years and is based solely on data from osteology and external morphology. The myology of the family remainednearly unexplored. The present study analyzed the facial, gular,pectoral, pelvic, and caudal muscles of carangids and closely related outgroups. Several characters from myology were discovered and analyzed under a cladistic paradigm. The new myological data were combined with the morphological data available in the literature in order to produce more robust and up to date phylogenetic hypotheses. The four traditional carangid tribes are herein recognized as monophyletic and the family is basally divided into two major sister clades: one comped by Trachinotini and Scomberoidini and another by Carangini and Naucratini. Also, the historically problematic genus Parastromateus was allocated intoaapical clade within the Carangini. The study of the fin musculature provided insights on the occurrence of muscles considered erratic across the Percomorphacea. Those new discoveries might be helpful for a better understanding of the phylogenetic relationships of thatlarge group.

Various aspects of metabolism and physiology were investigated during the ontogeny of yellowtail kingfish (Seriola lalandi), a fish of growing aquaculture importance in both New Zealand and other countries. Incubation experiments between 18-24°C showed that developing eggs and larvae were heavily influenced by temperature. It appeared that at warmer temperatures larvae hatched smaller but grew on the yolk sac, whereas at cooler temperatures larvae grew inside the chorion. Oxygen consumption data supported this, with a negative correlation found between total embryonic oxygen consumption and temperature. A mechanism was proposed to explain the differential effect of temperature on ontogeny and growth. Like other marine fish with pelagic eggs, yellowtail kingfish were found to be heavily reliant on free amino acids as a source of energy. At 23°C the pattern of substrate utilisation in eggs was considerably different from that at 17-21°C, indicating that 23°C exceeded the tolerance for normal development. Inter-individual aggression by large individuals was associated with the development of size heterogeneity in juveniles. Although this aggression also affected the survival of smaller juveniles, it was not the primary agent of much of the mortality that occurs during this phase, as many of these individuals were on a degenerate developmental trajectory. Yellowtail kingfish fingerlings used for ongrowing were robust to the stressors imposed by live transport. The ontogenetic development of metabolic rate from 0.6 mg-2.2 kg did not follow the same scaling exponent as that observed for mammalian models of allometry, and has implications for interspecific studies of mass-dependent metabolism.

Este trabalho teve como objetivo o estudo dos hábitos alimentares de três espécies de peixes da família Carangidae, da zona de surf da enseada de Caraguatatuba, São Paulo. Amostras de Selene setapinnis, Selene vomer e Oligoplites saliens foram obtidas com rede de arrasto de porta, mensalmente, entre maio de 2003 e outubro de 2004, em duas áreas previamente selecionadas na enseada, com profundidade variando entre 1 e 5 metros. Foram medidos e pesados 3022 exemplares, e 1367 estômagos foram retirados para a análise de conteúdo estomacal. A composição da dieta foi analisada por meio das frequências de ocorrência, numérica, gravimétrica, e volumétrica, e de índices alimentares. Todos os exemplares eram jovens e a sua dieta foi composta principalmente por Crustacea. Outros grandes grupos presentes foram Chaetognatha e Teleostei. Dentre os crustáceos, destacaramse as larvas de Decapoda, os misidáceos, os camarões Acetes americanus e os copépodes calanóides Labidocera fluviatilis e Acartia lilljeborgii. As variações intraespecíficas da dieta, bem como as relações interespecíficas, foram avaliadas através de análises de agrupamento. Foi observada uma tendência de aumento do tamanho da presa com o aumento do tamanho do peixe. Embora A. americanus tenha sido importante na dieta em todos os tamanhos, nas três espécies, houve maior destaque desse item nos peixes maiores, enquanto Lucifer faxoni e larvas de Decapoda foram mais importantes nos menores. Avaliando-se o comportamento alimentar, há indicações de que as três espécies tendem a ser generalistas e a explorar o hábitat de maneira semelhante. Em relação à variabilidade temporal, as espécies diferiram entre si: S. vomer, não apresentou diferença intra-anual significativa, ao contrário de S. setapinnis e O. saliens.
The purpose of this work was to study the food habits of three Carangidae juvenile fish species, from the surf zone in Caraguatatuba sound, São Paulo. Samples were taken monthly, with an otter trawl, from May 2003 to October 2004, in two areas previously selected in the bay, between 1 and 5 meters deep. Weight and length of 3002 specimens were taken, and 1367 stomach contents were examined. The diet composition was analyzed through frequencies of occurrence, number, weight and volume, and feeding indexes. The main food item was Crustacea, particularly Decapoda larvae, Mysidae, the shrimp Acetes americanus, and the calanoid copepods Labidocera fluviatilis and Acartia lilljeborgii. Chaetognatha and Teleostei were also present. Seasonal and ontogenetic variations of the diet and interspecific interactions were performed by similarity measures. Ontogenetic changes in diet were recognized; smaller fish consumed smaller prey, and the prey size increased with the body size. Though Acetes americanus were the main item of all sizes, it was more important in bigger fish, while Lucifer faxoni and Decapoda larvae were more important in smaller ones. Selene setapinnis and Oligoplites saliens showed temporal food variability, but Selene vomer did not. The three species were considered as generalists showed similarity in feeding habits.

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Cytogenetics analyses in fish are important because they compose a private group among the vertebrates, occupying a central position in the animal evolution. The Perciforms Order, dominant in the marine and freshwater environment, it constitutes a model potentially useful in the genetic evaluation of populations, as well as in the understanding of its evolutionary processes. In spite of this, cytogenetics studies in this great group is scarce, above all for the inhabitants of sandy bottom and pelagics habits. The present work proposed to contribute for the cytogenetic characterization of nine species of fish marine of sandy bottom of the coast of Rio Grande do Norte (Brazil), identifying the evolutionary patterns related to the karyotype in these species and the existence of filogenetics affinities between them and other Perciformes. The animals were collected in the beaches of the Redinha, Ponta Negra and B?zios (Coast of Rio Grande do Norte) and in Saint Peter and Saint Paul Archipelago. Later on they were submitted to the cytogenetics technical that consist of mitotic estimulation, obtaining of mitotics chromosomes, proceeded by techniques of conventional coloration (Giemsa) and chromosomic bands (Ag-RONs and C band). Diploid number and fundamental number equal to 48 were observed in most of the species: Menticirrhus americanus, Ophioscion punctatissimus, Pareques acuminatus (Sciaenidae); Chloroscombrus chrysurus (Carangidae); Echeneis sp. 2 (Echeneidae); Archosargus probatocephalus (Sparidae) and Orthopristis ruber (Haemulidae). Trachinotus goodei (NF=52) (Carangidae) and Echeneis sp. 1 (Echeneidae) (NF=54) presented variation in NF, staying constant a diploid number equal to 48. RONs was situated in pericentromeric position in whole the scianids, and in the species Echeneis sp. 2 (22? pair), O. ruber and A. probatocephalus (1? pair), coinciding with great heterocromatics blocks in M. americanus (1? pair), P. acuminatus (2? pairl) and O. ruber (1? pair). RONs was also located in the telomeric area of the short arm of the 5? and 11? acrocentrics pairs in T. goodei, 4? and 19? pairs of C. chrysurus, 1? pair (sm) of Echeneis sp. 1. The C band detected centromeric blocks in most of the chromosomes of the species of Sciaenidae, Carangidae and Echeneidae, with great blocks in A. probatocephalus (4? pair). Heterocromatic blocks in telomeric areas in submetacentrics of Echeneis sp. 1, and pericentromerics in M. americanus (1? and 8? pairs), O. punctatissimus (1? pair) and P. acuminatus (2? pair) were also observed. It is noticed a marked conservatism cromossomic in the species of the family Scianidae and Haemulidae in what says respect to the number of acrocentrics chromosomes and the location of RONs. Even so it is outstanding the presence of heterocromatinization events during the karyotypic evolution of this family. Already in the families Sparidae and Carangidae, the obtained results reaffirm examples of small variations structural resultants of inversion and translocation Robertsonian, as important mechanisms of diversification karyotipical, as well as a pattern numerical evolutionary conserved, also observed in representatives of Echeneidae of Atlantic in relation to Pacific. The presence of RONs multiple, observed in the species T. goodei and C. chrysurus seems to represent a character derived in the family Carangidae. The results for the species O. ruber and A. probatocephalus suggest the presence of possible geographical or climatic barriers among populations of NE of Brazil in relationship the one of the SE
An?lises citogen?ticas em peixes s?o importantes porque os mesmos comp?em um grupo particular entre os vertebrados, ocupando posi??o central na evolu??o animal. A Ordem Perciformes, dominante nos ambientes marinhos e dulc?colas, constitui um modelo potencialmente ?til na avalia??o gen?tica de popula??es, como tamb?m no entendimento de seus processos evolutivos. Apesar disto, ainda s?o escassos os estudos citogen?ticos neste grande grupo, sobretudo para os habitantes de fundo arenoso e h?bitos pel?gicos. O presente trabalho se prop?s a contribuir para a caracteriza??o citogen?tica de nove esp?cies de peixes marinhos litor?neos de fundo arenoso do litoral do Rio Grande do Norte (Brasil), identificando os padr?es evolutivos relacionados ao cari?tipo nestas esp?cies e a exist?ncia de afinidades filogen?ticas entre elas e outros Perciformes. Os animais foram coletados nas praias da Redinha, Ponta Negra e B?zios (Litoral do Rio Grande do Norte) e no Arquip?lago de S?o Pedro e S?o Paulo. Posteriormente foram submetidos ?s t?cnicas citogen?ticas que consistem em estimula??o mit?tica, obten??o de cromossomos mit?ticos, seguida por t?cnicas de colora??o convencional (Giemsa) e bandamentos cromoss?micos (Ag-RONs e bandamento C). N?mero dipl?ide e n?mero fundamental iguais a 48 foram observados na maioria das esp?cies: Menticirrhus americanus, Ophioscion punctatissimus, Pareques acuminatus (Sciaenidae); Chloroscombrus chrysurus (Carangidae); Echeneis sp. 2 (Echeneidae); Archosargus probatocephalus (Sparidae) e Orthopristis ruber (Haemulidae). Trachinotus goodei (NF=52) (Carangidae) e Echeneis sp. 1 (Echeneidae) (NF=54) apresentaram uma varia??o no NF, mantendo-se constante um n?mero dipl?ide igual a 48. As RONs estavam situadas em posi??o pericentrom?rica em todas os scian?deos, e nas esp?cies Echeneis sp. 2 (22? par), O. ruber e A. probatocephalus (1? par), coincidindo com grandes blocos heterocrom?ticos em M. americanus (1? par), P. acuminatus (2? par) e O. ruber (1? par). As RONs tamb?m foram localizadas na regi?o telom?rica do bra?o curto do 5? e 11? pares acroc?ntricos em T. goodei, 4? e 19? pares de C. chrysurus, 1? par (sm) de Echeneis sp. 1. O bandamento C detectou blocos centrom?ricos na maioria dos cromossomos das esp?cies de Sciaenidae, Carangidae e Echeneidae, com grandes blocos em A. probatocephalus (4? par). Blocos heterocrom?ticos em regi?es telom?ricas em submetac?ntricos de Echeneis sp. 1, e pericentrom?ricas em M. americanus (1? e 8? pares), O. punctatissimus (1? par) e P. acuminatus (2? par) tamb?m foram observados. Nota-se um marcante conservadorismo cromoss?mico nas esp?cies da fam?lia Scianidae e Haemulidae no que diz respeito ao n?mero de cromossomos acroc?ntricos e a localiza??o das RONs. Por?m ? destacada a presen?a de eventos de heterocromatiniza??o durante a evolu??o cariot?pica desta fam?lia. J? nas fam?lias Sparidae e Carangidae, os resultados obtidos reafirmam exemplos de pequenas varia??es estruturais resultantes de invers?es e transloca??es Robertsonianas, como principais mecanismos de diversifica??o cariot?pica, bem como um padr?o evolutivo mais conservado numericamente, tamb?m observado em representantes de Echeneidae do Atl?ntico em rela??o ao Pac?fico. A presen?a de RONs m?ltiplas, observadas nas esp?cies T. goodei e C. chrysurus parecem representar um car?ter derivado na fam?lia Carangidae. Os resultados para as esp?cies O. ruber e A. probatocephalus sugerem a presen?a de poss?veis barreiras geogr?ficas ou clim?ticas entre suas popula??es no NE do Brasil, quando comparada com a regi?o SE

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Species of the Carangidae family are important components of fish fauna during all phases of the life span. Both Selene spixii (full moon fish) Spix and Agassiz (1831) and Selene Vomer (Atlantic look down) Linnaeus (1758) range in the Western Atlantic Ocean from New Scotia (Canada) to South America including the Gulf of Mexico. They are found in coastal shallow waters, either on hard or sandy bottoms. They usually establish schoals, but are also observed in small groups or pairs. They feed on small crustaceans, shrimps, fish and worms. Their flesh tastes good; these species are trade fresh. They can also be reared, they are highly prized in sport fishing. Both species are very similar in early phases of their life cycle, which renders the identification at the species level quite difficult. The aim of the present study was to carry out analyses of the pattern of morphological differentiation between the above mentioned species of Selene genre, using as method 1, techniques of multivariate analysis of the 16 distances between landmarks, defined in the truss net; and as method 2, the relative warps analysis (thin plate spline function) on the coordinates of 9 landmarks. Morphometric data were obtained from scanner digitalized images and the coordinates of the landmarks by using tpsdigw program, the distances were obtained from a program developed in language C and the relative warps analysis from tpsRelw program. Similarities were discriminated between the studied species using both Principal Components Analysis, Canonic as well as Discriminant Analyses based on morphometric features. The landmarks usedwere: 1. tip of the nose, 2. base of pelvic fin, 3. beginning of the first dorsal fin, 4. beginning of anal fin, 5. beginning of the second dorsal fin, 6. end of anal fin, 7.end of the second dorsal fin, 8. beginning of lower caudal fin, 9. beginning of upper caudal fin. According to method 1, measures D 1-3 and D 3-4 were the most important whereas for method 2, among shape variations, the one which contributes the most was the component x.
Os Carangidae são importantes componentes da ictiofauna em todas as fases da vida e as espécies Selene spixii (Lua-do-Caribe) Spix e Agassiz (1831) e Selene vomer (galo–de-penacho) Linnaeus (1758) estão distribuídas pelo Atlântico Oeste de Nova Escócia (Canadá) ao longo das costas do Golfo do México até a América do Sul. Esses peixes são encontrados em águas rasas costeiras, sobre fundos duros ou arenosos. Vivem em cardumes, mas também podem ser observados em pequenos grupos ou em pares. Alimentam-se de pequenos caranguejos, camarões, peixes e poliquetas. Sua carne apresenta um sabor excelente, sendo comercializado fresco. Estes peixes podem ser cultivados em aquários, são valorizados na pesca esportiva, e ambas espécies apresentam grande semelhança na fase jovem o que dificulta a identificação. O objetivo deste trabalho foi analisar os padrões de diferenciação morfológicos entre as espécies do gênero Selene, utilizando como método 1, técnicas de análise multivariada das 16 distâncias entre marcos anatômicos, definidas na rede de treliças; e como método 2, a análise de deformações relativas (função thin plate spline) sobre as coordenadas de 9 marcos anatômicos. Os dados morfométricos foram obtidos em imagens digitalizadas por scanner, as coordenadas dos marcos anatômicos pelo programa tpsDig, as distâncias obtidas por programa desenvolvido em linguagem C e a análise de deformações relativas através do programa tpsRelw. Pretendeu-se discriminar similaridades entre as duas espécies por meio de Componentes Principais, Análise de Variáveis Canônicas e Análise Discriminante com base em características morfométricas. Foram utilizados os seguintes marcos anatômicos: 1. ponta do focinho; 2. base da nadadeira ventral (pélvica); 3. início da primeira nadadeira dorsal; 4. início da nadadeira anal; 5. início da segunda nadadeira dorsal; 6. final da nadadeira anal; 7. final da segunda nadadeira dorsal; 8. início da nadadeira caudal inferior; 9. início da nadadeira caudal superior. No método 1, as medidas D 1-3 e D 3-4 foram as mais importantes, enquanto que no método 2, dentre as variações de forma, a que mais contribuiu foi a componente uniforme x.

Estuaries are highly productive ecosystems that provide an important nursery function to many marine-spawning fish species. While in estuaries, the juveniles of estuary-associated fishes are exposed to frequent, abrupt changes in environmental conditions and, as such, utilise movement as a strategy to cope with the changing conditions. Therefore, to gain a better understanding of the importance of estuaries (i.e. estuary-dependency) to estuary-associated species, knowledge on their movement patterns within estuaries, the links between habitats, and the environmental and cyclical processes driving these movements, is necessary. Lichia amia, commonly known as leervis or garrick in southern Africa, is an over-exploited, estuary-dependent fishery species targeted by coastal recreational and subsistence fishers, as well as spearfishers, throughout its South African distribution. Aspects of its biology and life history have been assessed; however, knowledge on its movement behaviour is limited to a single conventional dart tagging study, which described large-scale coastal movements of juvenile, sub-adult and adult leervis. As such, little is known about area use and movement patterns within estuaries, or the degree of connectivity between estuarine and marine habitats. Therefore, the aim of this study, using conventional dart tagging and passive acoustic telemetry methods, was to assess the role of estuarine nursery habitats in the life cycle of the leervis by examining area use patterns and movement behaviour within estuaries, investigating the degree of habitat connectivity, and determining the drivers (cyclical rhythms and environmental variables) of estuarine use and connectivity. A dedicated conventional mark-recapture study on juvenile leervis within the Swartkops Estuary revealed a high level of estuarine fidelity (philopatry) suggesting that estuaries are important nursery habitats. However, movement distances increased with increasing fish length, with some fish also being recaptured in the neighbouring marine environment. These results provided evidence of an ontogenetic habitat shift, with smaller fish remaining in the estuary for extended periods and larger individuals undertaking more extensive movements. Complementary passive acoustic telemetry studies were conducted in the Kowie and Goukou estuaries, spaced 620 km apart, to assess area use, movement patterns, residency and multiple habitat connectivity of juvenile leervis. These telemetry studies showed varying levels of residency within the tagging estuaries, and seasonal variation in area use. The lengths of estuary used by leervis tagged in the Kowie Estuary generally decreased with the onset of austral winter, while fish tagged in the Goukou Estuary generally moved into the marine environment. Despite tagged individuals spending on average 56% and 38% of the total monitoring periods within the Kowie and Goukou estuaries, respectively, fish displayed high levels of multiple habitat connectivity, with 71% and 76% of Kowie and Goukou fish, respectively, visiting adjacent marine and estuarine environments. A total of 11 different neighbouring habitats (estuaries and ports) were visited by Kowie fish, while fish tagged in the Goukou Estuary only visited four adjacent habitats. These differences in connectivity could be attributed to the proximity of many more estuaries to the Kowie Estuary compared to the Goukou Estuary. Estuarine movements by acoustically tagged leervis in both estuaries followed a strong diel but a much weaker tidal pattern. A number of environmental variables significantly influenced estuarine movements and marine excursions (including river inflow, photoperiod and moon phase). However, water temperature (river and sea) had the most significant effects on these movements, with decreasing winter river temperatures coincident with a downstream shift in mean daily position of fish tagged in the Kowie Estuary, and movement into the marine environment from the Goukou Estuary. Interestingly, the area use patterns of juvenile leervis tagged in the Kowie and Goukou estuaries were different, predominantly using limited portions of each estuary. Kowie fish spent more time in the mouth region and lower reaches, while Goukou fish spent more time in the lower and middle reaches of the estuary. Therefore, should no-take Estuarine Protected Areas be implemented, inter-estuary differences would need to be considered to determine the most effective stretches of estuary to close to provide maximum protection for leervis. This study provided new information on the movement behaviour of juvenile leervis, the degree to which juveniles depend on estuaries as nursery areas, and the cyclical rhythms and environmental factors influencing their movements. The study therefore contributes considerably to our understanding of the role of estuaries in the life history of leervis, and provides essential information for the improved management of this over-exploited species.

A exposição dos peixes a poluentes provoca danos nos organismos que podem ser identificados precocemente através de respostas biológicas. O presente estudo visou avaliar os efeitos do naftaleno e benzo(a)pireno em pampos da espécie Trachinotus carolinus. Foram avaliados os efeitos citogenotóxicos, histopatológicos e bioquímicos após exposições às concentrações de 0,9 M; 2,7 M e 8,1 M de NAP e BAP por períodos de 12, 24, 48 e 96 horas. O NAP causa quebra no DNA de eritrócitos de pampos em concentrações de 8,1 M e a partir de 12 horas de exposição. O BAP revelou ser genotóxico a partir da menor concentração e de 24 horas. A mutagenicidade de ambos os poluentes, avaliada através da indução de formação de micronúcleos e anormalidades nucleares eritrocitárias, também ocorre a partir de curtos períodos de exposição e freqüências de MN e ANE estão relacionadas com a duração da exposição. O período de exposição aos HPAs foi determinante na intensidade e severidade das lesões observadas nos tecidos dos peixes. A especificidade de CYP1A, observada segundo análise imunohistoquímica, ocorreu de maneira dose-dependente e evidenciada principalmente nos maiores períodos experimentais. Os poluentes orgânicos, nas condições experimentais utilizadas, não provocaram alteração significativa na atividade das enzimas catalase e GST da espécie. Os biomarcadores, citogenotóxicos e histopatológicos utilizados neste estudo, demonstraram ser ferramentas eficientes para aferir a toxicidade, genotoxicidade e mutagenicidade de NAP e BAP como também sua relação dose-resposta na espécie T. carolinus.
Effects of exposure of fish to pollutants can be identified through stress responses. The present study aims to evaluate the effects of naphthalene and benzo(a)pyrene in Florida pompanos, Trachinotus carolinus. Evidences from citogenotoxical, histopathological and biochemical studies showed that alterations caused by exposures to 0.9 M, 2.7 M and 8.1 M of NAP and BAP occurred within 12 to 96 hours. NAP at 8.1 M induced erythrocyte DNA strand breaks in pompanos since early periods of exposure. Genotoxic effects of BAP at the lowest concentration were documented soon after 24 hours of exposure. Mutagenotoxicity of both pollutants, as seen by the induction of MN and ENA, was revealed since early periods and their frequencies are related to the duration of exposure. Exposures to these PAHs, for longer periods, resulted in increased frequency and severity of lesions observed in fish tissues. Specificity of CYP1A, observed through immunohistochemical analyses, was related to the dose of the pollutants and mainly at longer periods of exposure. These organic pollutants, under the experimental conditions, did not interfere with the activity of liver catalase and GST of the species. The citogenotoxic and histopathologic biomarkers used in this study proved to be efficient tools to ascertain the toxicity, genotoxicity and mutagenesis of NAP and BAP, as well as their dose related response, in the species T. carolinus.

A temperatura é um fator abiótico que exerce profundos efeitos no funcionamento dos ecossistemas marinhos, influenciando na biologia das espécies. Os peixes são um bom modelo para se estudar este fator, pois são pecilotérmicos e possuem importância comercial e ecológica. O objetivo deste trabalho foi analisar o comportamento, a tolerância térmica e os mecânicos moleculares de juvenis de peixe pampo Trachinotus carolinus em relação à elevação da temperatura. Para isso, foram submetidos ao aumento controlado da temperatura da água (2°C/h) a partir da temperatura de coleta (22°C) até 26°C, 30°C, 32°C, 34°C e 36°C e nestas foram mantidos por 120 minutos, ou foram aquecidos até a morte no estudo de tolerância térmica. O comportamento foi analisado usando-se vídeos e as expressões de Hsp70 e p53 nas brânquias e no coração dos pampos foram obtidas por meio da técnica de imuno-histoquímica Os resultados mostraram que os pampos comportam-se de forma agitada com o aquecimento até a temperatura de 36°C, e a partir dela apresentam uma desorganização dos sistemas e órgãos. A expressão de Hsp70 e p53 está relacionada ao aumento de temperatura até 34°C e decai nas temperaturas de 36°C e TCS. Assim, conclui-se que o aumento de temperatura afeta o comportamento e a expressão de Hsp70 e p53.
Temperature is an abiotic factor that influences the biology of marine species. Fishes are a good model to study temperature because they are poikilothermic and have ecological and commercial importance. The aim of this study was to analyze the behavior and study the expression of Hsp70 and p53 using the immunohistochemistry assay. The Expression of these two protein was observed in relation to temperature rise in heart and gills tissues of juvenile pompano fish Trachinotus carolinus. The Fishes were exposed to controlled increase of the water temperature (2°C/h), from 22°C (control) to 26°C, 30°C, 32°C, 34°C and 36°C and they were maintained in these temperature for 120 minutes . After that fishes were maintained in these temperature for 120 minutes. In addition, experiments were performed to determinate the critical temperature survival (TCS). The results revealed that the expression of Hsp70 and p53 were proportional to the temperature rise until 34°C and that it declines at temperatures of 36°C and TCS. The fishes behavior was frantic with heating until a temperature of 36°C and subsequently they have showed a disorganization of systems and organs. We concluded that the temperature increase affects the behavior and expression of p53 and Hsp70 in pompanos fishes.

A temperatura é um fator abiótico fundamental que influencia diretamente o comportamento e a sobrevivência dos organismos, incluindo peixes. Por serem ectotérmicos, peixes respondem diretamente à variação de temperatura. Eles possuem mecanismos celulares de termoestabilidade, com diferentes expressões, ajustados evolutivamente às condições do meio. O presente trabalho tem como objetivo estudar os efeitos do aumento gradual da temperatura (2°C/h) a partir da temperatura ambiente de inverno (22°C) até 26, 30, 32, 34 e 36°C e temperatura crítica de sobrevivência (TCS) em peixes pampo, Trachinotus carolinus. Analisou-se o comportamento a partir de vídeos; a expressão das proteínas relacionadas à hipóxia tecidual HIF-1~a e VEGF em músculo e fígado através da técnica de imuno-histoquímica; e análises celulares através da quantificação de mitocôndrias e mensuração de sua área. Os resultados mostraram que o comportamento dos pampos é alterado com o aumento da temperatura, apresentando um padrão definido. As maiores expressões proteicas foram em temperaturas elevadas, a 34°C no caso do VEGF e a 36°C no caso do HIF-1 ~a. Houve aumento no número de mitocôndrias e queda em sua área conforme o aumento da temperatura. Portanto, a temperatura tem influência em todos os níveis de organização estudados, ou seja, celular, tecidual e do organismo
Temperature is an important abiotic factor that influences directly the behavior and survival of organisms, including fish. Fishes are ectothermic, and respond directly to temperature variation. They have cellular mechanisms of thermostability that were adjusted during evolution to environmental conditions. The present work aims to study the effects of the gradual increase in temperature (2°C / h) from the winter temperature (22°C) to 26, 30, 32, 34 and 36°C and critical survival temperature (TCS) in fish pompano, Trachinotus carolinus. We analyzed the behavior out of vídeos; the expression of proteins related to tissue hypoxia HIF-1 ~a and VEGF in muscle and liver through the technique of immunohistochemistry; and determined the number and the área of cellular mitochondria. The results showed that the behavior of pampano changes with increasing temperature, in a gradual scale pattern. The protein expressions were higher at elevated temperatures, at 34°C in the case of VEGF and at 36°C in the case of HIF-1 ~a. An increase in the number of mitochondria, and a decrease in their area were observed with increasing temperature. Therefore, temperature had measurable effects at all levels of organization studied, i.e., cellular, tissular and organismic

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Worldwide, families Carangidae and Rachycentridae represent one of the groups most important commercial fish, used for food, and great potential for marine aquaculture. However, the genetic bases that can underpin the future cultivation of these species, cytogenetic between these aspects are very weak. The chromosomal patterns have provided basic data for the exploration of biotechnological processes aimed at handling chromosomal genetic improvement, such as induction of polyploidy, androgenesis and ginogenesis, as well as obtaining monosex stocks and interspecific hybridizations. This paper presents a comprehensive cytogenetic survey in 10 species, seven of the family Carangidae and the monotypic family Rachycentridae. Classical cytogenetic analysis and in situ mapping of multigene sequences were employed, and additionally for the genus Selene and morphotypes of Caranx lugubris, comparisons were made using geometric morphometrics. In general, conservative species exhibit a marked chromosome number (2n=48). Although present in large part, different karyotypic form, retain many characteristics typical of chromosomal Order Perciformes, the high number of elements monobrachyal, Ag-NORs/18S rDNA sites and heterochromatin simply reduced, preferably centromeric. The main mechanisms involved in karyotypic diversification are the pericentric inversions, with secondary action of centric fusions. In addition to physical mapping and chromosome detail for the species are presented and discussed patterns of intra-and interspecific diversity, cytotaxonomic markers. This data set provides a better understanding of these patterns caryoevolutyonary groups and conditions for the development of protocols based on Biotechnology for chromosomal manipulation Atlantic these species
Entre os peixes marinhos, as fam?lias Carangidae e Rachycentridae se apresentam como grupos de grande import?ncia comercial pela pesca e potencial para piscicultura marinha. Entretanto, bases gen?ticas que possam alicer?ar o futuro cultivo destas esp?cies, sobretudo seus aspectos citogen?ticos s?o incipientes. Os padr?es cromoss?micos t?m fornecido dados b?sicos para a prospec??o de processos biotecnol?gicos de manipula??o cromoss?mica voltados ao melhoramento gen?tico, como a indu??o a poliploidia, ginog?nese e androg?nese, assim como obten??o de estoques monossexo e hibridiza??es interespec?ficas. Neste trabalho ? apresentado um amplo levantamento citogen?tico em 10 esp?cies, sendo sete da fam?lia Carangidae e de Rachycentron canadum, esp?cie monot?pica da fam?lia Rachycentridae. A caracteriza??o citogen?tica cl?ssica e mapeamento in situ de sequ?ncias multig?nicas foram empregadas. Adicionalmente em esp?cies do g?nero Selene e em morf?tipos de Caranx lugubris foram realizadas compara??es atrav?s de morfometria geom?trica. Em geral, as esp?cies exibiram um marcante conservadorismo cromoss?mico num?rico (2n=48). Apesar de apresentar, em grande parte, f?rmulas cariot?picas diferenciadas, conservam diversas caracter?sticas cromoss?micas t?picas da Ordem Perciformes, como elevado n?mero de elementos monobraquiais, s?tios Ag-RONs/ DNAr 18S simples e heterocromatina reduzida, preferencialmente centrom?rica. Os principais mecanismos envolvidos na diversifica??o cariot?pica s?o as invers?es peric?ntricas, com a??o secund?ria de fus?es c?ntricas. Al?m do mapeamento f?sico e detalhamento cromoss?mico para as esp?cies s?o apresentados e discutidos padr?es de variabilidade intra e diversifica??o interespec?ficas, com identifica??o de marcadores citotaxon?micos. Este conjunto dos dados propicia um melhor conhecimento dos padr?es carioevolutivos destes grupos e condi??es para o desenvolvimento de protocolos biotecnol?gicos baseados na manipula??o cromoss?mica para estas esp?cies Atl?nticas

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Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior
?Oligoplites palometa (Cuvier) and Oligoplites saurus (Bloch & Schneider) (Osteichthyes: Carangidae) are coastal pelagic fish species. The objective of this study was to investigate the effect of parasitism by isopods and the reproductive biology of the leather jack, Oligoplites spp. A total of 113 individuals of Oligoplites spp (35 of O. saurus and 78 of O. palometa) were captured during the period between January, 2005 and July, 2007 from the coastal waters of Natal, RN. The morphometric and meristic characters were registered; macroscopic analyses were done to collect the isopod parasites and the gonads were observed to verify the reproductive aspects. The crustacean isopod parasite, Cymothoa spinipalpa (Isopoda: Cymothidae) was encountered on the tongue in the oral cavity in both fish hosts. The parasitic indices of C. spinipalpa showed high values of prevalance of 51,4% for O. saurus and 64,1% for O. palometa. The host presented significant correlations between body mass and body length of O. palometa and the number of parasites. Body lengths of female C. spinipalpa were small due to the limited space available in the oral cavity of the host. There was a significant difference in the sex ratio of O. palometa, males outnumbered the females. The isopod parasites showed specificity to the oral cavity of hosts. Macroscopic analyses of gonads showed four stages of gonadal development for both sex of O. palometa: immature, maturing, mature and spent
?As esp?cies Oligoplites palometa (Cuvier) e Oligoplites saurus (Bloch & Schneider) (Osteichthyes: Carangidae) s?o peixes costeiros pel?gicos. O objetivo do presente trabalho foi estudar o parasitismo por is?podos e a biologia reprodutiva em tibiro, Oligoplites spp. Foram capturados cento e treze exemplares de Oligoplites spp durante o per?odo de janeiro de 2005 a julho de 2007 nas ?guas costeiras de Natal, RN. Foram realizadas as medidas morfom?tricas e mer?sticas, a an?lise macrosc?pica para coleta dos parasitos is?podos e a retirada das g?nadas para o estudo dos aspectos reprodutivos. Foi encontrada uma nova esp?cie de ectoparasito, Cymothoa spinipalpa (Isopoda: Cymothidae), sobre a l?ngua na cavidade oral em ambas as esp?cies de Oligoplites. Os ?ndices parasit?rios de C. spinipalpa indicaram uma alta preval?ncia sendo de 51,4% para O. saurus e de 64,1% para O. palometa. Em O. palometa existe uma correla??o significativa entre peso do hospedeiro e o n?mero de parasito como tamb?m entre o comprimento total do hospedeiro e o n?mero de parasito. As f?meas de C. spinipalpa tiveram seu comprimento limitado pelo ambiente f?sico dispon?vel na cavidade bucal do hospedeiro. Foi encontrada uma diferen?a significativa na propor??o sexual de O. palometa, com um maior n?mero de machos em rela??o ao n?mero de f?meas. Os is?podos t?m especificidade pela cavidade oral dos hospedeiros. A an?lise macrosc?pica das g?nadas permitiu a identifica??o de quatro est?dios distintos de matura??o em ambos os sexos de O. palometa: imaturo, em matura??o, maduro e esvaziado

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Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq)
Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES)
O extenso litoral brasileiro ? multipartido em diferentes ecossistemas, compostos por estu?rios, manguezais, sistemas recifais, ilhas costeiras e oce?nicas. Estes ambientes possuem uma ictiofauna bastante diversificada composta por 1.297 esp?cies, das quais aproximadamente 25% representam esp?cies end?micas. Esses n?veis de biodiversidade podem ser incertos, devido a ocorr?ncia de esp?cies cr?pticas e polit?picas e pela aus?ncia de estudos populacionais, sobretudo em esp?cies recifais. Neste sentido, foram analisados aspectos populacionais, taxon?micos e filogen?ticos de esp?cies das fam?lias Pomacentridae (Perciformes) e Carangidae (Carangiformes), distribu?dos ao longo da costa e ilhas oce?nicas brasileiras. As an?lises moleculares e morfom?tricas realizadas em S. variabilis, S. fuscus, S. rocasensis, S. sanctipauli e S. fuscus trindadensis indicaram sinon?mia entre S. rocasensis e S. sanctipauli, e entre S. fuscus e S. fuscus trindadensis. Al?m disso, revelaram a presen?a de uma poss?vel esp?cie cr?ptica que tem sido confundida com S. variabilis. As an?lises populacionais em Abudefduf saxatilis no Atl?ntico Ocidental, incluindo as ilhas oce?nicas, revelam um quadro de panmixia desde a Venezuela at? o sudeste do Brasil, enquanto que as popula??es insulares possuem diferentes n?veis de estrutura??o gen?tica, sobretudo a da Ilha de Trindade. As an?lises gen?ticas na esp?cie polit?pica Caranx lugubris indicaram uma grande popula??o panm?tica no Atl?ntico Ocidental, lan?ando novos dados sobre a origem dos morf?tipos que ocorrem no entorno do Arquip?lago de S?o Pedro e S?o Paulo. Os dados obtidos aprofundam o conhecimento da fauna ?ctica insular do Atl?ntico e servem de subs?dios para o manejo e conserva??o de esp?cies dessas importantes e particulares regi?es oce?nicas.
The extensive Brazilian coast is multi-party in different ecosystems, composed by estuaries, mangroves, reef systems, oceanic and coastal islands. These environments detain a largely diversified ichthyofauna composed by 1,297 species, in which 25% represents endemic species. These levels of biodiversity can be uncertain, because of the occurrence of cryptic and polytypic species and the absence of population studies, especially in reef species. In this sense, population, taxonomical and phylogenetical aspects were analyzed form species of the Pomacentridae (Perciformes) and Carangidae (Carangiformes) families, along the coast and oceanic islands of Brazil. The molecular and morphometric analyzes were performed in S. variabilis, S. fuscus, S. rocasensis, S. sanctipauli and S. fuscus trindadensis indicated synonym among S. rocasensis and S. sanctipauli, and between S. fuscus and S. fuscus trindadensis. Besides that, revealed the presence of a possible cryptic species which has been confused with S. variabilis. The population analyzes in Abudefduf saxatilis at the Western Atlantic, including the oceanic islands, reveals a status of panmixia from Venezuela to the Southeast of Brazil, while the island populations have different levels of genetic structuration, specially the population of the Trindade island. The genetic analyzes in the polytypic species Caranx lugubris indicated a large panmitic population in the Western Atlantic, revealing new data about the origins of the morphotypes that occurs in the surroundings of the Saint Paul Rocks archipelago. The data obtained expands the knowledge over the insular ichthyic fauna of the Atlantic and serves as subsidy to the conservation and management of species of these particular and important oceanic regions.

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Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico, CNPq, Brasil.
Morphodynamism, extratification and seasonality are among the main factor to influence the composition and abundance of the macroinfauna in sandy beaches. The macroinfauna of two sandy beaches were sampled between winter-2005 and summer-2006 during low tide; one beach was protected (Flamengo beach) located in Guanabara bay, and the other was exposed to waves in the oceanic zone (Grumari beach). The hypothesis that the physical characteristics of the beaches determine the difference in composition and relative abundance of the macroinfauna was tested. Flamengo beach was characterized as dissipative and had comparatively higher t?xon richenes and lower biomass, when compared with Grumari beach that was classsified as reflective. In Flamengo beaches, higher abundance was recordded for Enoploides sp, and Emerita brasiliensis, whereas in Grumari beach Sacocirrus sp and E. brasiliensis were the most abundant taxons. The beaches showed highe dissimilarity in composition and relative abundance of the taxons (91.75%). Sacocirrus sp, Enoploides sp, Dispio uncinata, Scolelepis goodbobyi and E. brasiliensis explained 63.70% of the dissimilarity between the two beaches. In both beaches, we observed extratification in occurence and abundance of the macroinfauna in two seasons. Emerita brasiliensis occurred mainly in Grumary beach in the extrate 1 and Sacocirrus sp in extrate 2, while in Flamengo beach E. brasiliensis and Enoploides sp had the highest abundance in extrate 1 and S. goodbody and D. uncinata in extrate 3. The hypothesis that the macrofauna differs among extrate and beaches was accepted and the differences in composition and relative abundance of the macroinfauna were attributed to morphodynamism, althought other environmental factores can be influencing such differences.
O morfodinamismo, estratifica??o e a sazonalidade s?o os fatores mais importantes na determina??o da composi??o e abund?ncia da macroinfauna em praias arenosas. A macroinfauna de duas praias foi amostrada no inverno/2005 e ver?o/2006 durante a mar? baixa, sendo uma praia protegida (Flamengo) localizada na ba?a de Guanabara, e outra praia exposta localizada na zona oce?nica (Grumari). Foi testada a hip?tese que as caracter?sticas f?sicas das praias determinam diferen?as na composi??o e abund?ncia da macroinfauna. A praia do Flamengo foi caracterizada como dissipativa e apresentou maior riqueza de t?xons, e menor biomassa, quando comparada com a praia de Grumari classificada como refletiva. Na praia do Flamengo as maiores abund?ncias foram registradas para Enoploides sp, e Emerita brasiliensis, enquanto em Grumari foram Sacocirrus sp e E. brasiliensis. As praias apresentaram elevada dissimilaridade na composi??o e abund?ncia relativa dos t?xons (91.75%), Sacocirrus sp, Enoploides sp, Dispio uncinata, Scolelepis goodbobyi e E. brasiliensis explicaram 63.70% das diferen?as entre as praias. Em ambas as praias foram observadas estratifica??es na ocorr?ncia e abund?ncia da macroinfauna nas duas esta??es analisadas. Na praia de Grumari, E. brasiliensis ocorreu principalmente no estrato 1 e Sacocirrus sp no estrato 2, enquanto na praia do Flamengo E. brasiliensis e Enoploides sp apresentaram as maiores abund?ncias no estrato 1 e S. goodbodyi e D. uncinata no estrato 3. A hip?tese da varia??o na composi??o da macroinfauna entre os extratos foi aceita, e as diferen?as observadas na composi??o e abund?ncia da macroinfauna foram atribu?das ao morfodinamismo; no entanto, outros fatores ambientais podem estar relacionados com tais diferen?as.

Artificial reefs have been deployed throughout the world’s oceans to act as habitat and fishing enhancement tools. To expand current research on the role of artificial reefs in the marine community, ordination and multivariate regression methods were used here to analyze survey data of natural and artificial reefs. The reefs, located in the Northern Gulf of Mexico (NGOM) and on the West Florida Shelf (WFS), had been previously surveyed from 2004 to 2015 using remote operated vehicle and stationary video techniques. This study tested the hypothesis that similar functional roles are accounted for at both natural and artificial reef sites even if species composition varies. Secondly, it examines the role of environment and fisheries in determining the assemblages. Artificial reefs tended to host communities that were as biodiverse as natural reefs, although not necessarily composed of the same species. Results of an ordination confirmed that as the classification was broadened from the level of species, to family, to functional group, the assemblages on each reef type (natural vs. artificial and NGOM vs WFS) appeared more similar. Dominant groups were present at all levels of classification and included the families Lutjanidae and Carangidae, as well as functional groups Red Snapper and Small Reef Fish. Both natural and artificial reefs tended to be dominated by one of the following: Lutjanidae, Carangidae, or Small Reef Fish, although a continuous gradient was found across the extremes of natural versus artificial reefs. Generalized Additive Models were developed to examine the influence of reef type, location, environment and fishing intensity covariates. Results indicated that for both natural and artificial reefs, the abundance of families and functional groups can be influenced by environmental factors. In both cases, there is strong spatial autocorrelation suggesting connectivity with neighboring reefs.

The assemblage structure, abundance, biomass, and vertical distribution of juvenile reef fishes in the offshore pelagic habitat of the northern Gulf of Mexico are described as part of the NOAA-supported Offshore Nekton Sampling and Analysis Program. The results presented here are from a 3-month, continuous sampling series in 2011 in which discrete depth strata from 0 to 1500 m were sampled using a 10-m2 MOCNESS midwater trawl. This is the first study to examine pelagic juvenile reef fish distributions across the entire oceanic northern Gulf of Mexico seaward of the continental shelf break after the Deepwater Horizon Oil Spill. During this series, 87,407 specimens were collected, of which 838 were reef fishes, representing seven orders, 30 families and 119 species. The faunal composition of pelagic juvenile reef fishes was diverse and well mixed, with no discernable spatial structure with respect to water masses and solar cycle. Seventy-nine percent of the pelagic juvenile reef fishes were collected in the epipelagic and the dominant families were Congridae, Carangidae, Tetraodontidae, and Acanthuridae. Species richness, biomass, and frequency of occurrence of pelagic juvenile reef fishes was greatest between 0-200 m and decreased with depth. Data from the assemblage structure, abundance, biomass, and vertical distribution of pelagic juvenile reef fishes collected from this cruise series will contribute to the lack of knowledge regarding the dispersal dynamics and coastal-connectivity of these fishes in the northern Gulf of Mexico.

Largespot pompano, Trachinotus botla, is a surf zone carangid with a cosmopolitan distribution in subtropical and tropical waters. Within South Africa, the species occurs along the KwaZulu-Natal coastline where it is a popular recreational fishing target. Recreational fishing in southern Africa has developed significantly in recent years, and is now regarded as an industry with huge economic potential. The long-term contribution of South African recreational fisheries to local economies is reliant upon sustainable exploitation through effective management. Trachinotus botla was found to grow rapidly with maximum observed age of six years. Otolith growth zone deposition was validated using edge analysis. Growth was similar between males and females until ~350 mm FL after which females continued to grow while growth in males slowed. The resulting overall sex ratio was slightly female-biased (1 male: 1.3 females). Trachinotus botla matures early with all fish considered to be mature at 290 mm FL, which corresponds to an age of three years. A protracted spawning season was observed ranging from November to February and there was evidence to suggest that T. botla is a serial spawner. Dietary analysis indicates that T. botla is an opportunistic predator with a catholic diet. The opportunistic utilization of “superabundant” prey items is a fundamental characteristic of the species feeding habits. An ontogenetic dietary shift was observed at approximately 300 mm FL that was linked to a shift in habitat preference. This thesis provided the first evidence that infection by the tongue-replacing isopod, Cymothoa borbonica, reduces the growth rate of wild host fish populations despite not affecting the diet, feeding habits and feeding frequency of their hosts. These results also highlighted the inadequacy of condition factor as a proxy for quantifying the effects of cymothoids on their hosts, and identified the need to incorporate host age when assessing the effects of parasite infection. Information on the life-cycle of C. borbonica, including estimates of the hypothesized “infectious” period and its longevity were obtained through analysis of parasite infection patterns as a function of host age and length. An assessment of the T. botla shore fishery of KwaZulu-Natal using historical catch data revealed that the fishery is stable. Productivity of the T. botla fishery increased towards the north of KwaZulu-Natal. Distinct seasonal variations in the T. botla fishery were also noted with catches peaking in summer months and lowest during winter. A per-recruit assessment revealed that the species is currently underexploited (SBR = 62% of pristine levels), and fishing mortality rate could be doubled before reaching the spawner biomass-per recruit target reference point of FSB₄₀. A combination of the life history characteristics of species, the nature of the recreational shore fishery together with the current management regulation of 5 fish person⁻¹ day⁻¹ has ensured the sustainable utilization of the T. botla resource in KwaZulu-Natal.

碩士
國立屏東科技大學
材料工程研究所
104
Twenty-first century is the era that information technology is rapid developed in a lot of fields such as agriculture, industry, and medicine. For the owners of domestic aquaculture fields, the judgment of water quantity by eye’s observations could not fit the climate extremely changed today. Although a lot of water monitoring equipments are used in the water treatment factory, there is a space for development some automatic robotics for detecting the environment factors during feeding the fish. The aim of present study us to design and study the performance of small-scale robotic fish that can swim with fish and can also monitor the changes in water quality. In this robotic fish, the shape of body is inspired from Carangidae fish and made by 3D printing machines. The propulsion mode is BCF (Body and / or Caudal Fin) with different shapes of trail. Arduino micro-control system is the core unit with pre-written program and the Zeebee module is used for communication. We have installed a water temperature sensor on the side of robot fish. App software is installed in the cell-phone that used to remote control the motion of robotic fish. A human machine interface written with language of Visual Basic is applied for giving commands for startup the flapping of trails for swimming. The length of robotic fish is forty centimeter and its weight is one thousand and sixty-five grams. The robot fish can swim on straight line, rotating and sensing temperature on water. The maximum travel speed can up to 0.69 times the robot fish body length, and the rotation speed is 21 degree/second. It can co-swim with real fish at low flapping frequency of trail.

Japanese yellowtail Seriola quinqueradiata has been commercially farmed in Japan since the 1940s. In comparison, sea-cage farming of yellowtail kingfish Seriola lalandi in Australia is still developing, with commercial production commencing in 1998. In Australia, S. lalandi is parasitised by Zeuxapta seriolae and Benedenia seriolae. In Japan, S. quinqueradiata is parasitised by Heteraxine heterocerca and B. seriolae. These monogeneans affect industries in both countries and management of these parasites is required to prevent impacts on fish health and commercial losses. I investigated efficacy (% reduction of mean parasite abundance) for orally administered praziquantel, fenbendzole and oxfendazole against Z. seriolae and B. seriolae on S. lalandi and the efficacy of orally administered praziquantel and febantel against H. heterocerca and B. seriolae on S. quinqueradiata. Medications were administered to fish by surface coating feed pellets or via direct intubation of the stomach. Seriola lalandi administered fenbendazole and oxfendazole by surface coating of feed had lower abundance of the gill parasite Z. seriolae. Seriola quinqueradiata intubated with febantel had lower abundance of the gill parasite H. heterocerca. Neither fenbendazole nor oxfendazole administered to S. lalandi in Australia, nor febantel administered to S. quinqueradiata in Japan resulted in a lower abundance of the skin parasite B. seriolae. Praziquantel was first administered to S. lalandi by surface coating of feed. Fish rejected medicated feed, suggesting praziquantel affected its palatability. Fish treated with feed medicated with praziquantel had fewer Z. seriolae and B. seriolae than untreated fish. Praziquantel administered to S. lalandi by intubation allowed a more accurate dose to be tested without differential feeding or reduced palatability obstructing results, and resulted in fewer Z. seriolae (99.5-100 % reduction) and B. seriolae (91 – 97.7 % reduction). Intubated praziquantel also led to fewer recruitment life stages of Z. seriolae and B. seriolae, even at low doses, but did not completely eliminate them from S. lalandi. Praziquantel administered to S. lalandi alone and combined with cimetidine had high efficacy (>99%) against Z. seriolae. In comparison, praziquantel administered alone resulted in fewer B. seriolae (68.3 – 69.7 % reduction) than the same doses of praziquantel combined with cimetidine (36.9 – 40.9 % reduction). A 90.4 -100% reduction in H. heterocerca was achieved when praziquantel was administered by intubation to S. quinqueradiata in Japan but there was only a 22-77.8 % reduction in B. seriolae. The dose of PZQ (150 mg kg⁻¹ body weight day⁻¹ for 3 days) on the label of a commercially available product used to treat B. seriolae in Japanese aquaculture resulted in a 50.9% reduction against B. seriolae, but completely eliminated H. heterocerca. In trials against Z. seriolae and B. seriolae on S. lalandi in South Australia, I also screened 27 other anthelmintics and antiparasitics from the chemical groups: amprolium derivatives, benzimidazoles, benzyl ureas, diphosphate salts, imidazothiazoles, macrocyclic lactones, nitromidazoles, organophosphates, piperazines, salicylanilides, substituted phenols and tetrahydropyrimidines. Of these, only the benzimidazole, albendazole, was effective against Z. seriolae and none appeared to have an effect against B. seriolae.
http://proxy.library.adelaide.edu.au/login?url= http://library.adelaide.edu.au/cgi-bin/Pwebrecon.cgi?BBID=1459172
Thesis (Ph.D.) -- University of Adelaide, School of Earth and Environmental Sciences, 2010

The limited range of garrick/leervis Lichia amia, its popularity as a gamefish to all sectors of the marine recreational linefishery and the degradation of many estuaries which function as nurseries for this species, has aroused concern about the stock status of this species. In addition, other than a preliminary investigation conducted by ORI in 1992, relatively little research has been undertaken on this important recreational species. Considering the recreational value of L. amia and the need to provide a scientific basis for its management, a comprehensive stock assessment was required. This study therefore investigated the biology and stock status of L. amia off the South African coast. Through ad hoc biological sampling undertaken from 1978-2007 and validation of growth by means of OTC marking, the growth of the L. amia population was best described as: Lt=1206mmfl(1-e-20[t+1.10 years]). Growth was also determined using tag-recapture and length frequency data. The tag-recapture data was further utilized in illustrating the movement behaviour of L. amia. Trends in catches were determined from the analysis of catch and effort data from the National Marine Linefish System (NMLS) and Boat Launch Site Monitoring System (BLSMS) databases. This showed a decreasing trend in the CPUE of L. amia along the KZN coast over time for all sectors of the KZN marine recreational linefishery investigated. The growth parameter estimates from the length-at-age data were used in undertaking a per-recruit assessment of L. amia. The results of the spawner-biomass-per-recruit (SBPR) model indicate that L. amia is at 14% of its unfished level. According to the South Africa.s Linefish Management Protocol (LMP), the L. amia stock has thus collapsed and appropriate management options to rebuild the stock are discussed.
Thesis (M.Sc.)-University of KwaZulu-Natal, 2008.

碩士
國立臺灣海洋大學
環境生物與漁業科學學系
101
The purpose of this study is to investigate the characteristics of the changes of fishing-oceanic conditions of the Carangidae fishery in the waters off Taiwan. This study utilized the geographic information system (GIS) to analyze two major sources of data obtained between January and December in 2011. The first source of data was based on the fishing activities of 866 sample Carangidae fishing vessels. The second source of data was collected from the records of the voyage date recorder (VDR). The result of the data analysis was also used to investigate the spatio-temporal distribution of catch rates in different types of Carangidae fishery. Based on the data of fishing activities from different types of Carangidae fishery vessels, the data shows that the average catch rate of Taiwanese seine fishery specimens is higher than other types of Carangidae fishery. The data shows that different tons of Taiwanese seine fishing vessels; the catch rate of CT2 was 255 kg/hour, the average catch rate of the seine fishery specimens are higher than 500 kg/hour and the CT4 which was 1,218 kg/hour is the most. The numbers of fish caught were classified into over 10 varieties. The dominant species was the Carangidae fish caught in the waters off the the coast Taiwan were: Decapterus maruadsi, Trachurus japonicus, Megalaspis cordyla, Carangoides malabaricus and Seriola dumerili. There are two major fishing grounds for Carangidae fishery, based on the distribution of cumulative fishing hours and the catch rate in unit area (0.2°×0.2°) in the waters off Taiwan. One is located between Yilan Bay and the waters off northeastern Taiwan, which is nearby the water front of the Kuroshio Current meets the coastal waters of China. Another one is located between the waters off southwestern Taiwan and PengHu, which is nearby the water front of the Kuroshio branch meets the coastal waters of China. By overlay of monthly catch rate from the specimen vessel of Carangidae fishery and the monthly sea surface temperature (SST) from the satellite, it shows that the distribution in these two fishing grounds varie and change by the monthly water front movement. The complete data taken when considered as a whole it is possible and reliable to analyze the distribution structure of Carangidae fish breeding grounds in the waters off Taiwan using the VDR data. Therefore, this thesis suggests this data collection process can be relied upon and can be used as a solid point of reference for fish catching management and policy-making in Taiwan.

碩士
國立臺灣海洋大學
食品科學系
102
Carangidae species are edible coastal fish with importantly economic value, and the commercial products of which are popular in Taiwan. It is difficult to identify fish species from commercial fish products when the morphological characteristics are partially or completely lost after processing. Since the liver of Carangidae is considered as valuable supplements in diet habits of Taiwanese, the occurrence of food poisoning caused by ingesting the liver of large-sized fish is occasionally happened in Taiwan. In order to protect and prevent consumers from food intoxication in above-mentioned cases, a rapid method has been developed to identify 15 common Carangidae species and their commercial products in this study. In addition, the risk of ingesting liver of large-sized Caranx ignobilis (CI), Seriola dumerili and S. quinqueradiata has been assessed. First, polymerase chain reaction - restriction fragment length polymorphism (PCR-RFLP) and DNA sequencing were used to establish RFLP map of 15 common Carangidae species in Taiwan. Second, the level of vitamin A in liver was examined by high performance liquid chromatography (HPLC), and the components of ciguateric toxins in liver was detected by mouse neuroblastoma cells Neuro-2a model and liquid chromatography - tandem mass spectrometry (LC-MS/MS). The developed PCR-RFLP method could be rapidly applied to identify the species of Carangidae both in fresh and commercial products in Taiwan. There is one fake product among in 10 commercial Carangidae products. The dose per unit of vitamin A has a positive correlation with the liver size and body weight of Carangidae fish. The vitamin A level in the liver of large-sized Carangidae is significant higher than the common fish. The existence of ciguatoxin (CTX) in the liver of sample CI-02 was detected by using developed cell test and LC-MS-MS, as approximately 0.08 ppb pacific-ciguatoxin-1 (P-CTX-1). In summary, the developed PCR-RFLP method in this study could be applied to distinguish authentication or fraudulent substitution of 15 Carangidae species, and used to identify causative residues that implicated in Carangidae fish-related food poisoning. The results indicate that large-sized Carangidae fish has a high level of vitamin A in the liver. This is the first research to demonstrate that the liver of large-sized Carangidae fish may accumulate P-CTX-1 via food chain in Taiwan. Acute vitamin A poisoning and ciguatera poisoning may occur simultaneously due to ingestion the liver of large-sized Carangidae.