Journal articles: 'Ichthyoplankton'

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Li, Shuofu, Jianguo He, and Zhigang Lai. "The Interannual Variations of Summer Ichthyoplankton in the Pearl River Estuary as a Response to Climate Change." Journal of Marine Science and Engineering 11, no. 1 (January 13, 2023): 209. http://dx.doi.org/10.3390/jmse11010209.

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The impacts of climate change on ichthyoplankton have barely been examined in the Pearl River estuary (PRE). Using the fish larvae and eggs caught in the estuary in the summer from 2003 to 2018 (except for the years 2004 and 2008), the spatial and temporal variations in ichthyoplankton’s abundance, species composition, and community structure were examined and linked to the variability of the climate system. A positive/negative correlation was found between the abundance and taxonomic diversity of the fish larvae and the monthly Oceanic Niño Index. However, the variation in larval fish’s species diversity was in phase with climate change, while the variation in larval fish’s abundance had a 3-month lag behind the climate variability. The different phases of the correlations reflect a progressive change in the ichthyoplankton dynamics under the influence of climate. Furthermore, during the period of the study, the regional climate underwent an obvious transition from a “cold” to a “warm” state in the early 2010s. Associated with that, it was found that both the abundance and species composition of the ichthyoplankton exhibit a significant change around that time, particularly for the fish larvae. A further examination of the ichthyoplankton’s horizontal distributions suggests that the assemblage of ichthyoplankton in the PRE is sensitive to the La Niña conditions. This leads to an overall reduction in ichthyoplankton’s abundance and less seaward spreading of the assemblage, implying the possible impact of climate change on river discharge and then the estuarine environment.

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Reynalte-Tataje, David Augusto, Keshiyu Nakatani, Rodrigo Fernandes, Angelo Antônio Agostinho, and Andréa Bialetzki. "Temporal distribution of ichthyoplankton in the Ivinhema River (Mato Grosso do Sul State/ Brazil): influence of environmental variables." Neotropical Ichthyology 9, no. 2 (June 10, 2011): 427–36. http://dx.doi.org/10.1590/s1679-62252011005000017.

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Information on ichthyoplankton is an important tool in determining reproduction periods that - if associated to environmental variables - allows for inferences about the factors that regulate their intensity, beginning, and ending. In this context, this study aims to establish (i) ichthyoplankton composition; (ii) temporal variations in the overall density of eggs and larvae and among the most important taxa; and (iii) the influence of some abiotic and biotic variables on these organisms' abundance. Ichthyoplankton sampling was undertaken during the period between April 2005 and March 2006 at the Ivinhema River, upper Paraná River basin (MS/Brazil). Differences in the ichthyoplankton's temporal variation were evaluated using unifactorial ANOVAs. Principal Component Analysis and Pearson's correlation were used for the relationships between eggs and larvae densities and environmental variables. A total of 3,341 eggs and 2,896 larvae were captured during the period studied, and most of them were medium-sized and large species that carried out some type of reproductive migration. The highest densities of eggs and larvae occurred during the months of spring and summer, except for those of Bryconamericus stramineus, which was most abundant during the winter. The density of ichthyoplankton was most positively correlated with the water's outflow and temperature. However, Plagioscion squamosissimus was positively related to the increase in pH and in zooplanktonic organisms, while B. stramineus was inversely correlated with water outflow and temperature. The study concludes that spawning is most intense in the spring and summer, especially between November and January, and is related to the greatest values of water temperature and outflow. Nevertheless, the response and reproductive intensity in relation to the environmental variables vary according to the species.

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Dempsey, C. H. "Ichthyoplankton entrainment." Journal of Fish Biology 33, sa (December 1988): 93–102. http://dx.doi.org/10.1111/j.1095-8649.1988.tb05563.x.

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Zhang, Hui, Weiwei Xian, and Shude Liu. "Autumn ichthyoplankton assemblage in the Yangtze Estuary shaped by environmental factors." PeerJ 4 (April 19, 2016): e1922. http://dx.doi.org/10.7717/peerj.1922.

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This study investigated the response of the ichthyoplankton community to environmental changes in the Yangtze Estuary using canonical correspondence analysis. Ichthyoplankton community and environmental data were recorded during the autumns of 1998, 2000, 2002, 2003, 2004, 2007 and 2009. Among the ichthyoplankton, the dominant larval and juvenile families were the Engraulidae, Gobiidae and Salangidae, and the most common eggs were fromTrichiurus lepturus. The ichthyoplankton was identified via canonical correspondence analysis to three assemblages: an estuary assemblage dominated byChaeturichthys stigmatias, a coastal assemblage dominated byEngraulis japonicusandStolephorus commersonii, and an offshore assemblage dominated byTrichiurus lepturus. Regarding environmental factors in the Yangtze Estuary, suspended matter and surface seawater salinity were the main factors influencing the distributions of the different assemblages, while sediment from the Yangtze River during the rainy season and chlorophyllawere the principle drivers of the annual variances in the distribution of ichthyoplankton assemblages. Our aims in this study were to provide detailed characterizations of the ichthyoplankton assemblage in the autumns of seven years, examine the long-term dynamics of autumn ichthyoplankton assemblages, and evaluate the influence of environmental factors on the spatial distribution and inter-annual variations of ichthyoplankton assemblages associated with the Yangtze Estuary.

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Mukhametov, I. N., O. N. Mukhametova, and V. N. Chastikov. "The spring ichthyoplankton of pacific water off northern Kuril Islands." Trudy VNIRO 190 (December 28, 2022): 62–78. http://dx.doi.org/10.36038/2307-3497-2022-190-62-78.

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The aim of the work is assesment of the species composition and spatial distribution of spring ichthyoplankton in area off northern Kuril Islands.Material and methods. It is based on the data of ichthyoplankton sampling in 2011, 2015 and 2016 yrs, trawl surveys in 2011 and 2015, and hydrological surveys in 2015 and 2016 yrs. Maps of the fish distribution at various stages of ontogenesis were made. Cluster analysis was used to identify the structure of ichthyoplankton in the 2015 collections.Novelty. For the first time, data on ichthyoplankton collected by the SakhNIRO in the 2010s near the northern Kuril Islands are presented. The ichthyoplankton complexes of the spring 2015 are identified and their spatial location is shown.Results. Eggs and larvae of 26 fish species were identified in ichthyoplankton collection, 86 species of teleosts were noted in trawl catches. The dominant components of ichthyoplankton were the walleye pollock eggs Gadus chalcogrammus, the larvae of the Pacific sand lance Ammodytes hexapterus and the larvae of sculpins gen. Gymnocanthus. Most species abundant in ichthyoplankton were among the most significant in trawl catches. The maximum abundance of ichthyoplankton, more than 600 ind./m2, in the area of the Northern Kuril occurred at the beginning of May. The structure of ichthyoplankton in April-May of 2015–2016 was quite similar, at the level of 60–70%.Practical significance. Knowledge of the main spawning areas of commercial fish and the places of development of their early stages is an important component for making decisions on the rational use of biological resources.

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Basova, Marina, Svetlana Krasheninnikova, and Vincenzo Parrino. "Intra-Decadal (2012–2021) Dynamics of Spatial Ichthyoplankton Distribution in Sevastopol Bay (Black Sea) Affected by Hydrometeorological Factors." Animals 12, no. 23 (November 28, 2022): 3317. http://dx.doi.org/10.3390/ani12233317.

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High mortality of fish in the early stages of ontogenesis requires the detection of factors affecting it and is an extremely important problem. For this reason, we tried to consider the influence of some hydrometeorological factors on the intra-decadal dynamics and spatial distribution of ichthyoplankton abundance in Sevastopol Bay. To this end, we analyzed ichthyoplankton samples collected in 2012–2021 in Sevastopol Bay, and the four districts were identified. The ichthyoplankton distribution by areas was associated with the peculiarities of the pollution distribution. The maximum numbers in eggs (34.7 ± 7.5 ind. m−2) and larvae (10.0 ± 2.4 ind. m−2) were recorded in July–August. For the first time, a positive effect of temperature and repeatability of north and northeast winds on the ichthyoplankton number during the summer spawning in all identified areas of Sevastopol Bay using principal component analysis (PCA) was reported. In the southern region, positive influence of temperature and northerly winds on the ichthyoplankton abundance was confirmed by ANOVA (p = 0.02), and Pearson’s correlation analysis revealed significant correlations between these parameters on inter-annual scale (r > 0.5). In the eastern area, the discharge of rivers is an additional factor affecting the abundance of ichthyoplankton, while in the western and central areas, these factors were the wind characteristics caused by the orography peculiarities. The pollution spread in Sevastopol Bay is also largely due to the wind regime. The importance of comprehensive monitoring studies using intra-decadal data on ichthyoplankton is emphasized.

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Silva, Patrícia Alves da, David Augusto Reynalte-Tataje, and Evoy Zaniboni-Filho. "Identification of fish nursery areas in a free tributary of an impoundment region, upper Uruguay River, Brazil." Neotropical Ichthyology 10, no. 2 (June 28, 2012): 425–38. http://dx.doi.org/10.1590/s1679-62252012005000012.

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This study aims to determine the importance of different environments of the Ligeiro River (upper Uruguay River, Brazil) in fish reproduction. For this purpose, three environments (sampling sites) were selected: rapids, a pool, and the mouth of the Ligeiro River. Ichthyoplankton, zooplankton, and benthos were sampled six times per month from September, 2006 to March, 2007. Zooplankton and ichthyoplankton samples were collected early in the evening with plankton nets (64 µm and 500 µm, respectively). Benthos samples were also collected early in the evening with a Van Veen dredge. Local abiotic variables (temperature, dissolved oxygen, pH, electrical conductivity, water speed, alkalinity, water hardness, and water transparency) were measured simultaneously with the biotic data sampling and were complemented by regional variables (water flow and precipitation). A total of 43,475 eggs and 2,269 larvae were captured. Of these larvae, 80.1% were in the pre-flexion and larval yolk stages. Digestive tract content showed that the greatest degree of repletion among the larvae in more advanced phases occurred in the pool environment. Water speed was the main characteristic used to differentiate the river's rapids and mouth from the pool. The abundance of zooplankton and benthos was not related to the distribution of densities among the different components of the ichthyoplankton. A greater abundance of eggs and larvae with yolk was found in the rapids and river mouth. Ordination analyses showed a connection between the advanced stage larvae and the pool environment. In conclusion, the rapids and river mouth of the Ligeiro River's are important locations for fish reproduction, particularly in regard to spawning and drifting of the ichthyoplankton's initial stages, whereas the pool represents a nursery place for larval growth.

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Dos Santos, Elizângela Alves, Ana Carla Asfora El-Deir, and Jacqueline Santos Silva Cavalcanti. "Microplastics vs. ichthyoplankton: effects of this interaction in controlled and estuarine environments." STUDIES IN ENVIRONMENTAL AND ANIMAL SCIENCES 3, no. 1 (March 15, 2022): 84–102. http://dx.doi.org/10.54020/seasv3n1-006.

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This literature review exploring the relationship between microplastics and ichthyoplankton was conducted in the main databases available online, considering the period from 2007 to 2021. Sixty articles were found reporting the presence of microplastics in estuarine environments (71.7%), and ingestion by ichthyoplankton in estuarine environments (16.6%) and under experimental conditions (11.7%). The most abundant microplastic found in natural environments was fiber (55%). Environments with densities between 17.5 and 4100 particles/m³ exhibited greater possibilities of ingestion of these particles by ichthyoplankton, the smaller the microplastic particle (63 μm-0.5 mm) the greater the probability (95%) of being ingested by ichthyoplankton (>2.56 mm). Danio rerio (zebrafish) was the species commonly used to assess the effects caused by the interaction between microplastics and ichthyoplankton under experimental conditions. The effects frequently reported were: increased heart rates (25%); growth inhibition (25%); interference in larvae’s swimming speed (53.4%); and inflammation in various organs (e.g., liver, intestine) (50%).

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Jiang, Rijin, James Leonard Lusana, and Yongjiu Chen. "High-Throughput DNA Metabarcoding as an Approach for Ichthyoplankton Survey in Oujiang River Estuary, China." Diversity 14, no. 12 (December 14, 2022): 1111. http://dx.doi.org/10.3390/d14121111.

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High-throughput DNA metabarcoding of mitochondrial 12S rRNA and Cyt b gene sequences was coupled with a morphology-based identification tool to assess ichthyoplankton community structure in Oujiang River Estuary, China. The performances of 12S and Cyt b barcoding markers were compared in terms of taxonomic resolution, detection and coverage, and their suitability was established for use as a quick and powerful ichthyoplankton assessment tool. A total of 30,138 ichthyoplankton (2462 eggs and 27,676 larvae) samples were collected from April to August 2015 and identified to 145 taxa belonging to 57 families and 105 genera. June and July were the main spawning months. Ichthyoplankton were more abundant around Lingkun and Qidu Islands and the upper parts of Oujiang River Estuary. The 12S gene marker presented higher species coverage and detection rate than Cyt b. DNA metabarcoding exhibited more representative species identification power than morphology. The findings reported in this study provided a key attempt towards the development of time-efficient and cost-effective ichthyoplankton identification and assessment tool.

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Saushkina, D. Ya, and A. V. Vinogradskaya. "Some of test results of the “Aldofix” in fixing the phytoplankton on the example of eggs of walleye pollock Theragra chalcogramma." Researches of the aquatic biological resources of Kamchatka and the North-West Part of the Pacific Ocean 1, no. 56 (December 8, 2020): 120–26. http://dx.doi.org/10.15853/2072-8212.2020.56.120-126.

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Data about new conservant “Aldofix” to fix ichthyoplankton are demonstrated. Series of experiments on the conservation of ichthyoplankton and eggs of walleye pollock were carried out with the use of “Aldofix” and its modernized solutions. External view, including color of the eggs, as a result of fixing in different solutions was described, and difference in the egg diameter was noted in case of fixing in formalin and “Aldofix”. It is concluded, that “Aldofix” (example № 1) was the most convinient fixing solution to preserve ichthyoplankton.

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Zhang, Hui, Weiwei Xian, and Shude Liu. "Seasonal variations of the ichthyoplankton assemblage in the Yangtze Estuary and its relationship with environmental factors." PeerJ 7 (February 21, 2019): e6482. http://dx.doi.org/10.7717/peerj.6482.

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Seasonal variations of the ichthyoplankton assemblage and its relationship with the environment were analyzed based on four seasonal surveys during 2012. Historical data was collected to be compared with results from previous years in order to indicate the seasonal and inter-annual variation of the ichthyoplankton assemblage in the Yangtze Estuary and the adjacent waters. A total of 3,688 individuals belonging to 5 orders, 9 families, and 15 species were collected. No samples were collected in the winter cruise. In 2012, all samples were separated into four ecotypes, which is comparable with the historical data from previous years. The Engraulis japonicus was the most abundant species of all teleost fishes. The E. japonicus was captured in every season and contributed the most to the abundance of ichthyoplankton, which was greater than that of previous years. This result may be due to the periodic fluctuations of E. japonicus or from the displacement of spawning grounds offshore for environmental reasons. The diversity indices of the assemblage were significantly different among seasons, with the number and abundance of the species peaking in the spring, while richness, evenness and diversity indices peaked in the autumn. The species richness of the ichthyoplankton varied from 0.74 to 1.62, the Pielou evenness index varied from 0.10 to 0.49 and the Shannon–Wiener index varied from 0.19 to 1.04. The results of CCA analysis showed that the major factors affecting the ichthyoplankton assemblage differed throughout the seasons. Chla was the key factor affecting the ichthyoplankton in 2012. These seasonal and inter-annual variations likely resulted from migrations associated with fish spawning as well as the environment. Compared with data from previous studies, the relationship between the assemblage structure of ichthyoplankton and corresponding environmental variables have undergone a decline.

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Soares, Rômulo de Araújo, Júlio Cesar Martins Ribeiro Júnior, Paula Cilene Alves da Silveira, Raimunda Fortes Carvalho Neta, and Audalio Rebelo Torres Junior. "La distribución del ictioplancton está directamente relacionada con la hidrodinámica de una región y el comportamiento de desove de los adultos. En este estudio buscamos mapear las zonas de mayor ocurrencia de ictioplancton observadas en la Bahía de São Marcos, que tiene una de las mayores amplitudes de marea en la Costa Amazónica, Brasil. El ictioplancton fue recolectado mediante una técnica de arrastre horizontal en la capa superficial, utilizando una red de rodillos cónicos con malla de 300 μm acoplada a un medidor de flujo, para estimar el volumen de agua filtrada en la Bahía de São Marcos (Complexo Estuarino de São Marcos - CESM, Maranhão) . La densidad se calculó a partir de la relación entre el número total de huevos y larvas en cada muestra y el volumen de agua filtrada. Las fuentes de Ictioplancton se consideraron continuas y se organizaron para representar de forma asincrónica las condiciones de distribución. Para ello se realizó utilizando el polígono de Voronoi para determinar la forma espacial del área de operación de todos los puntos de muestreo. El uso de CESM, como lugar de desove y cría de larvas de peces, se verificó en todas las épocas del año, con mayor densidad de huevos en la época de lluvias y mayor densidad de larvas durante la época seca. La ubicación de las mayores densidades de ictioplancton varió, con las concentraciones más altas más cerca del canal sureste del CESM en la estación seca, moviéndose hacia el centro en la estación lluviosa. El canal sureste del CESM era, por tanto, un área de cría de muchas especies de peces, lo que requería una acción prioritaria para la protección del medio ambiente." Research, Society and Development 9, no. 10 (October 25, 2020): e9229109238. http://dx.doi.org/10.33448/rsd-v9i10.9238.

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The occurrence of ichthyoplankton is associated to the hydrodynamics and spawning behavior of adults. In this study we aimed to detect regions of concentration of ichthyoplankton in São Marcos Bay, which has macro tidal amplitudes in Amazon Coast, Brazil. Ichthyoplankton was acquired by way of drag technique, using with 300 μm mesh. The density was obtained considering the number of eggs and larvae in filtered water. The sources of Ichthyoplankton were defined continuous and organized to denote the asynchronously the distribution conditions. To this was done using Voronoi polygon to determine the spatial shape of the region of operation of all sampling points. The use of CESM, as a spawning site and breeding fish larvae, was verified at all times of the year, with a higher density of eggs in the wet period and a higher density of larvae during the dry period. The position of the higher ichthyoplankton densities varied, considering concentrations in the area at south-east channel of the CESM in the rainless period, going to the central area in the wet period. The southeast of CESM is, therefore, a nursery for fish, requiring environmental management actions.

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Dagg, MJ, and JJ Govoni. "Is Ichthyoplankton Predation an Important Source of Copepod Mortality in Subtropical Coastal Waters?" Marine and Freshwater Research 47, no. 2 (1996): 137. http://dx.doi.org/10.1071/mf9960137.

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The significance of ichthyoplankton-induced mortality to copepods was examined at three localities in the northern Gulf of Mexico: in the winter at a site of an exceptionally high concentration of larval spot, Leiostomus xanthurus; in the winter at a highly productive region near the Mississippi River delta; and in the summer in a highly eutrophic estuary dominated by larval bay anchovy, Anchoa mitchilli. In each region, ichthyoplankton ingestion of copepod eggs, nauplii and copepodids was compared with production rates and stocks of the dominant copepod species in the same waters. In all cases, predation from the dominant larval species and from the total ichthyoplankton assemblage was much less than prey production. It is concluded that ichthyoplankton predation in these regions rarely has any significant effect on copepod population dynamics, and therefore larval competition for food is unlikely to contribute to density-dependent mortality.

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Lee, O., R. D. M. Nash, and B. S. Danilowicz. "Small-scale spatio-temporal variability in ichthyoplankton and zooplankton distribution in relation to a tidal-mixing front in the Irish Sea." ICES Journal of Marine Science 62, no. 6 (January 1, 2005): 1021–36. http://dx.doi.org/10.1016/j.icesjms.2005.04.016.

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Abstract This study examines the spatio-temporal dynamics of fish larvae and their prey at a tidal-mixing front in the central Irish Sea. The distribution of ichthyoplankton and zooplankton was analysed in relation to environmental variables (depth, surface temperature, surface salinity, and water column stratification) using Redundancy Analysis (RDA). Significant interannual variability in the formation and position of the tidal-mixing front coincided with large differences in the species abundances of both ichthyoplankton and zooplankton. During the summer, ichthyoplankton and zooplankton communities were structured by a combination of depth and hydrography, and the variability in species composition was directly related to the average value of the stratification parameter. Several ichthyoplankton species were consistently associated with frontal waters, while fewer species were concentrated in mixed water masses throughout the sampling period. The distribution of individual zooplankton species was also examined, and water mass affinities were shown to vary with developmental stage.

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Qin, Qubin, Jian Shen, Troy Tuckey, Xun Cai, and Jilian Xiong. "Using Forward and Backward Particle Tracking Approaches to Analyze Impacts of a Water Intake on Ichthyoplankton Mortality in the Appomattox River." Journal of Marine Science and Engineering 10, no. 9 (September 14, 2022): 1299. http://dx.doi.org/10.3390/jmse10091299.

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Municipal intakes of surface water have various uses, and their impacts on the aquatic environment and ecosystem, such as the impingement and entrainment of ichthyoplankton, are a major concern. A robust assessment of the intake impacts on ichthyoplankton in a system generally requires modeling efforts that can simulate the transport and dispersal pathways of the ichthyoplankton. However, it is challenging to simulate hydrodynamics with a high-resolution grid at the scale needed for intake screen sizes in a large system. In this study, a 3D unstructured grid model with a fine resolution grid (<1 m) was developed to investigate potential impacts of an intake on aquatic resources in a tidal freshwater estuary. This approach enables us to directly estimate intake-induced mortality. With the use of the coupled particle-tracking model, we evaluated the total and maximum daily removal rates of particles by the intake that can be used to estimate percent mortality of ichthyoplankton. We further investigated how impacts from the intake vary with spawning locations, flow conditions, and vertical migration velocity of ichthyoplankton. A risk assessment was conducted based on designed flow of water withdrawals. This approach is widely applicable and can address impacts of water intakes in other systems.

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Dembek, Małgorzata, Luiza Bielecka, Piotr Margoński, and Tycjan Wodzinowski. "Changes in the composition and abundance of ichthyoplankton along environmental gradients of the southern Baltic Sea." Oceanological and Hydrobiological Studies 48, no. 4 (December 18, 2019): 328–36. http://dx.doi.org/10.2478/ohs-2019-0030.

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Abstract The research focuses mainly on the ichthyoplankton of the Baltic deeps – the inflow route from the North Sea. The ichthyoplankton was represented by eggs and larvae of nine fish species: sprat, cod, herring, European flounder, fourbeard rockling, longspined bullhead, straightnose pipefish, sand goby and great sandeel. The species composition of ichthyoplankton varied depending on the location of a given site – the number of taxa ranged from one to five. The Slupsk Furrow was the most diversified area in terms of the number of taxa, while the highest abundance of ichthyoplankton occurred in the Bornholm Basin. The sprat clearly dominated and inhabited all the surveyed depths. Of the remaining species, only cod eggs as well as eggs and larvae of the fourbeard rockling significantly contributed to this formation. They occurred within their main spawning grounds (Bornholm Deep in the near-bottom layers) and secondary spawning grounds (Slupsk Furrow and Gdansk Deep) where salinity and oxygenation of water favored their development. Biometric research has shown that the diameter of eggs was within the size range typical of the Baltic Sea.

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Klimova, T. N., A. A. Subbotin, V. V. Melnikov, A. N. Serebrennikov, and P. S. Podrezova. "Spatial distribution of ichthyoplankton near the Crimean Peninsula in the summer spawning season 2013." Marine Biological Journal 4, no. 1 (March 31, 2019): 63–80. http://dx.doi.org/10.21072/mbj.2019.04.1.06.

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Data obtained in five complex cruises of RV “Professor Vodyanitsky”, carried out from May to September 2013, in the summer spawning season, are analyzed. The dynamics of ichthyoplankton species diversity and spatial distribution depending on hydrological regime peculiarities in different regions of the shelf and open waters of the Black Sea off the Crimean Peninsula is presented. Totally 17 species of fish eggs and larvae from 13 families were identified in ichthyoplankton, maximum number of species was observed in June. Average eggs and larvae numbers during the spawning season were 50.5 and 9.2 specimen per m², respectively. Maximum abundance of eggs and larvae was observed in July (109.9 and 9.2 specimen per m², respectively). Eggs and larvae of anchovy Engraulis encrasicolus (Linnaeus, 1758) dominated: their proportion in open waters in the height of the spawning season amounted 96 and 94 %, respectively. Maximum indexes of species diversity and evenness (significance of each species) were observed in May, at the beginning of spawning season, when dominant species had just started their spawning and their abundance in ichthyoplankton was comparatively low. Species richness indexes reached the maximum value in June, when maximum species number in ichthyoplankton was observed. Species composition and spatial distribution of ichthyoplankton depended on the thermohydrodynamic structure of the sea in the studied regions, and decline of jelly plankton pressing on ichthyoplankton fodder base contributed to the survival of fish larvae. The most significant factors determining the thermohydrodynamic structure of the sea in the summer spawning season 2013 were: regional peculiarities of the sea surface warming up regime in spring-summer period and its cooling in autumn hydrological season; advective contribution of surface currents (first of all, the Main Black Sea Current); wind-driven processes (upwelling and vortex dipole) in the coastal regions; local thermohaline inhomogeneities in the areas of freshened river water mixing with shelf waters in the north-western part of the Black Sea and the Sea of Azov waters at the beginning of the Kerch Strait mixing with open sea waters.

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Olivar, M. P. "Ichthyoplankton assemblages off northern Namibia." South African Journal of Marine Science 5, no. 1 (June 1, 1987): 627–43. http://dx.doi.org/10.2989/025776187784522388.

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Arkhipov, A. G., and A. A. Mamedov. "Ichthyoplankton of Rockall-Hutton seamounts." Journal of Ichthyology 47, no. 7 (August 2007): 511–19. http://dx.doi.org/10.1134/s0032945207070053.

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Arkhipov, A. G., and A. A. Mamedov. "Ichthyoplankton of the Azores seamounts." Journal of Ichthyology 48, no. 3 (April 2008): 259–67. http://dx.doi.org/10.1134/s0032945208030089.

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Macedo-Soares, Luis C. P., Alesandra B. Birolo, and Andrea S. Freire. "Spatial and temporal distribution of fish eggs and larvae in a subtropical coastal lagoon, Santa Catarina State, Brazil." Neotropical Ichthyology 7, no. 2 (June 2009): 231–40. http://dx.doi.org/10.1590/s1679-62252009000200015.

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This study investigated the variation in abundance, distribution and composition of ichthyoplankton in a lagoon in southern Brazil through the year and at different stations within the lagoon. Ibiraquera Lagoon is a shallow coastal lagoon connected to the sea by a semi-permanent sandbar. Ichthyoplankton samples were collected monthly from December 2003 to December 2004, with a 200 µm mesh net using horizontal surface hauls. A colder, drier period was detected, contrasting with warm months during which salinity varied depending on rainfall and whether the sandbar was open or closed. The mean abundance of ichthyoplankton over the study period was 459.6 ± 76.2 (SE) eggs · 100 m-3 and 63.6 ± 7.9 (SE) larvae · 100 m-3, and they were present during all months. Significantly higher abundances of eggs and larvae were observed during warm months. The community was dominated by the family Engraulidae followed by Clupeidae, Gobiidae and Mugilidae. Engraulidae and Clupeidae were present throughout the year, with greater abundances in months with higher temperatures. Some coastal fish species spawn in Ibiraquera Lagoon, mainly near to the sandbar, demonstrating that the lagoon is a spawning area for coastal stock. We recommend the establishment of environmental procedures to promote the conservation of Ibiraquera Lagoon and its ichthyoplankton community.

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Stahl, Thomas P., and Roy A. Stein. "Influence of Larval Gizzard Shad (Dorosoma cepedianum) Density on Piscivory and Growth of Young-of-Year Saugeye (Stizostedion vitreum × S. canadense)." Canadian Journal of Fisheries and Aquatic Sciences 51, no. 9 (September 1, 1994): 1993–2002. http://dx.doi.org/10.1139/f94-202.

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Growth and survival of young-of-year saugeye (Stizostedion vitreum ♂ × S. canadense ♀) (stocked into Ohio reservoirs to create sport fisheries) are probably influenced by prey availability, variations in which may account for historically documented variability in stocking success. Because saugeye switch from a diet of zooplankton to fish once stocked, we sought to determine experimentally if saugeye size and available ichthyoplankton, i.e., larval gizzard shad (Dorosoma cepedianum), affected this switch and whether piscivory improved saugeye growth. In an enclosure experiment, saugeye (33.9 mm TL) immediately switched to piscivory when exposed to ichthyoplankton densities of 20 and 100∙m−3, growing faster when more gizzard shad were available. In another enclosure experiment, saugeye 30–49 mm TL consumed 14-mm gizzard shad. In ponds (N = 4 ponds∙treatment−1) containing zooplankton and chironomids, we compared saugeye growth with and without larval gizzard shad and found, as in the first enclosure experiment, that piscivory improved saugeye growth. Neither saugeye size nor ichthyoplankton density influenced how quickly saugeye switched to piscivory. We conclude that managers should stock saugeye ≥ 30 mm 1–2 wk before peak ichthyoplankton densities to improve saugeye growth and survival by enhancing opportunities for exploitation of young-of-year gizzard shad.

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Vieira, Thaila, Fabíola Silva, Zaqueu Santos, Lucas Oliveira, Ruineris Cajado, Elzamara Oliveira, and Diego Zacardi. "ICHTHYOPLANKTON COMMUNITY IN LAGOONS OF THE TAPAJÓS AND TROMBETAS RIVERS, EASTERN AMAZON." ACTA OF FISHERIES AND AQUATIC RESSOURCES 10, no. 2 (2022): 113–32. http://dx.doi.org/10.46732/actafish.2022.10.2.113-132.

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We evaluated the structure of the ichthyoplanktonic assemblage (taxonomic composition, abundance, developmental stages, and relationship with local environmental variables) in marginal lagoons located in the clearwater Tapajós and Trombetas rivers, Amazon Basin, Brazil during periods of high water (rising waters and flooding). Samples were collected by means of horizontal drags in the subsurface of the water with a plankton net (300 µm mesh). Sorting, counting, identification of biological material, and classification of embryonic and larval stages were performed under a stereoscopic microscope. A total of 122 eggs and 2,813 fish larvae were captured and distributed in nine orders, 18 families, 20 genera, and 26 species. Of these, more than 75% are considered sedentary or short-distance migrants and more than 50% are of commercial interest. The results revealed fluctuating patterns of abundance and species composition between the lagoons of the two rivers. The ichthyoplankton community in the lagoons consisted mainly of larvae of native pelagic fish belonging to the Engraulidae family and larvae of benthic fish such as Eleotridae, making up more than 85% of the individuals captured in the study area. In addition to these two groups, some larvae of piranha species (Pygocentrus nattereri) stood out due to their high densities in the Tapajós river lagoons and croaker larvae (Plagioscion spp.) in the Trombetas river lagoons. The highest larval densities were recorded during the night with significant variations recorded in species composition. The presence of all stages of larval development indicates that these biotopes enable growth and are essential for the biological recruitment of fish species in the region. The ichthyoplankton showed a low correlation with the limnological variables, however, the patterns of abundance and composition of fish larval assemblages in the lagoons of the Tapajós and Trombetas rivers were preliminarily elucidated, although additional work is needed to assess the effects on survival and recruitment

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Carvalho, Daniel Cardoso. "Ichthyoplankton DNA metabarcoding: Challenges and perspectives." Molecular Ecology 31, no. 6 (February 16, 2022): 1612–14. http://dx.doi.org/10.1111/mec.16387.

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Felley, Susan M., Michael Vecchione, and Sandra G. F. Hare. "Incidence of Ectoparasitic Copepods on Ichthyoplankton." Copeia 1987, no. 3 (August 5, 1987): 778. http://dx.doi.org/10.2307/1445673.

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Maggia, M. E., Y. Vigouroux, J. F. Renno, F. Duponchelle, E. Desmarais, J. Nunez, C. García-Dávila, et al. "DNA Metabarcoding of Amazonian Ichthyoplankton Swarms." PLOS ONE 12, no. 1 (January 17, 2017): e0170009. http://dx.doi.org/10.1371/journal.pone.0170009.

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Monreal Gómez, María Adela, David Alberto Salas de León, Cesar Flores Coto, Fernando Flores Hernández, David Salas Monreal, and Mayra Lorena Riverón Enzástiga. "Tidal effects on ichthyoplankton aggregation and dispersion in the Southern Gulf of Mexico." Brazilian Journal of Oceanography 61, no. 4 (December 2013): 231–41. http://dx.doi.org/10.1590/s1679-87592013000400004.

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The role of vertical barotropic and baroclinic tidal forcing in the aggregation and dispersion of ichthyoplankton in the Southern Gulf of Mexico was analyzed in this study. Samplings of ichthyoplankton and the determination of hydrographic parameters were performed during September 1992 at a single point of 180 m depth, near the shelf break (19º32'N - 92º38.5'W). A 24 h CTD yo-yoing casting and biological samples were taken every 2 h and these measurements were combined with water velocity and density simulations from the Regional Ocean Model System (ROMS). One thermocline and two haloclines were depicted. The Froude number increased with a 2 h lag with respect to the maximal barotropic tide, suggesting the existence of a baroclinic tide. Aggregation and dispersion of the ichthyoplankton showed vertical oscillations in the abundance and the numbers of taxa and larvae with a 5 h lag with respect to the maximal barotropic tide and were in phase with the thermocline oscillation. The vertical oscillation was attributed to a hydraulic control forced by the internal tide.

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Ávila-Simas, Sunshine de, David Augusto Reynalte-Tataje, and Evoy Zaniboni-Filho. "Pools and rapids as spawning and nursery areas for fish in a river stretch without floodplains." Neotropical Ichthyology 12, no. 3 (September 16, 2014): 611–22. http://dx.doi.org/10.1590/1982-0224-20130116.

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This study aimed to evaluate the importance of two environments situated in the main channel of the Peixe River (a tributary of the upper Uruguay River) on fish reproduction and initial growth. Ichthyoplankton, macrozooplankton, and zoobenthos collections were taken on a monthly basis from October 2011 to March 2012, sampling a rapids and a pool environment. The instrument used for the capture of the ichthyoplankton in both environments was a light trap. In total, 795 eggs and 274 larvae were captured. The species that presented higher abundance and occurrence frequency out of the total captured in both environments were Leporinus obtusidens, Bryconamericus iheringii, and Bryconamericus stramineus. The evaluation of the feeding activity reveals a major repletion degree of the larvae in more advanced stages in the pool. The pool environment presented a higher abundance of larvae in more advanced development stages. We conclude that the channel of the Peixe River is important for the reproduction and initial growth of fish and that each river environment seems to fulfill a different role in the life cycle of the ichthyoplankton community.

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Landaeta, Mauricio F., Javier Vera-Duarte, María José Ochoa-Muñoz, Claudia A. Bustos, and Fernando Balbontín. "Feeding ecology of fish larvae from Chilean Patagonia during austral winter." Revista de Biología Marina y Oceanografía 54, no. 2 (September 13, 2019): 221. http://dx.doi.org/10.22370/rbmo.2019.54.2.1906.

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Feeding habits of the ichthyoplankton from Chilean Patagonia (44-46°30’S) were studied during June-July 2012 (austral winter). Ichthyoplankton assemblage was composed by 10 species, with low abundance (3.8 to 16.73 ind. 1000 m-3). Most abundant larvae were Maurolicus parvipinnis, Leptonotus blainvilleanus and Sprattus fuegensis. These three species fed mainly on calanoid copepodites, Paracalanus indicus and Calanus sp. copepodites, and cyphonautes. Trophic overlap among dominant fish larvae was high (Schoener’s D > 0.69) and no significant differences were detected in prey composition and size. Therefore, no resource partitioning occurred in planktonic fish larvae during winter 2012 in Chilean Patagonia.

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Karaseva, E. M., A. G. Arkhipov, and E. E. Ezhova. "Ichthyoplankton of the South-Eastern Baltic Sea in the summer season: modern changes in the distribution and abundance of eggs and larvae of mass species." Trudy VNIRO 181 (2020): 165–77. http://dx.doi.org/10.36038/2307-3497-2020-181-165-177.

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The aim of ichthyoplankton studies in July 2019 was to monitor the distribution and estimate the abundance of: 1) eggs and larvae of mass pelagophilous fish species (cod, sprat) in deep-water areas; 2) larvae of small-sized benthic fish species inhabiting the shallow coastal zone of the South-Eastern Baltic Sea (the exclusive economic zone of the Russian Federation). It was noted, the main concentrations of cod and sprat eggs were in the northern part of the area (southern slope of Gotland Deep). Aggregations with a noticeably lower abundance of eggs were observed in the Gdansk basin. In July 2019, the average abundance of cod eggs (3.4 ind./m2) was higher than in the years without strong North Sea advections according to observations in the 1990–2000. Although the reproduction of sprat was nearing completion, in July its eggs dominated the ichthyoplankton assemblage of the deep-water zone, tenfold exceeding the numbers of cod eggs. In the composition of the ichthyoplankton of the shallow-water zone, 7 species of fish larvae were found, among which the sand goby dominated in numbers. Its small-sized larvae were most abundant above depths from 20 to 40 m, which made it possible to identify this depth range as an area of intensive spawning of the species. The decrease in the number of sand goby larvae in the 2010s, compared to the beginning of the 2000s, could be associated with the spread of the Ponto-Caspian invader round goby in the coastal zone, small-sized fry of which were also found in July 2019 in the ichthyoplankton of the coastal zone.

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Suzuki, Fábio Mineo, Lucas Vilela Pires, and Paulo Santos Pompeu. "Passage of fish larvae and eggs through the Funil, Itutinga and Camargos Reservoirs on the upper Rio Grande (Minas Gerais, Brazil)." Neotropical Ichthyology 9, no. 3 (2011): 617–22. http://dx.doi.org/10.1590/s1679-62252011000300014.

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The objective of this study was to evaluate the passage of fish eggs and larvae through the Funil, Itutinga and Camargos Reservoirs, located in the upper Rio Grande basin, Minas Gerais, Brazil. Samples were taken downstream and upstream of the dams using a conical ichthyoplankton net and were collected every two weeks, twice per sampling day, between November 2008 and March 2009. Although eggs and larvae were abundant immediately upstream of the reservoirs, no ichthyoplankton were captured immediately downstream of the dams, possibly indicating that eggs and larvae do not pass through the reservoirs. The arrival of ichthyoplankton in the reservoirs without its effective passage downstream makes the survival of these eggs and larvae unlikely. Furthermore, this lack of downstream movement may compromise the recruitment of species to downstream stretches, especially in the case of the Funil Reservoir (because of the presence of a fish pass in this dam). We emphasize that the fish lift operation at the Funil Dam must be carefully assessed, considering not only its efficiency but also its short- and long-term effects on the recruitment of migratory fish species from the river.

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Gao, Minghui, Zhiqiang Wu, Xichang Tan, Liangliang Huang, Jie Feng, and Saeed Rad. "Ontogenetic Structure and Temporal Patterns of Summer Ichthyoplankton in Upper Course of the Xijiang River, SW China." Water 13, no. 5 (March 5, 2021): 703. http://dx.doi.org/10.3390/w13050703.

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The summer ichthyoplankton characteristics in the Laibin section of the Xijiang River were analyzed based on a survey during summer 2017. The ontogenetic structure and temporal patterns of ichthyoplankton and the correlation between environmental parameters and the temporal patterns were investigated. A total of 10,665 eggs and 447 larval belonging to four orders, ten families, and 28 species were collected. According to the flood regime, summer is divided into three periods (pre-flood, flood period, and post-flood). Ichthyoplankton proved to be heterogeneous between periods in summer with differences in the composition and abundance. The assemblages were distinguished by multiple analytical tools, and presented a chronological pattern of marked variability in composition of the species between the periods, and under the strong influence of flood. The assemblages were mainly represented by eggs of S. wui Fang and S. robusta in the pre-flood period, S. argentatus and S. macrops in the flood period, and H. leucisculus and S. curriculus in the post-flood period, while, the larval occurred mainly in the flood period. Understanding these temporal patterns of the upper course of the Xijiang River is useful for the recruitment of fish resources and conservation of fish community diversity.

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Eko Dwi Haryono, Florencius, Rose Dewi, Taufik Budhi Pramono, Rifki Ahda Sumantri, Tri Nur Cahyo, and Dewi Wisudyanti. "Interaction of oceanography patterns towards the abundance of phytoplankton, zooplankton and ichthyoplankton in teluk penyu waters of Cilacap." E3S Web of Conferences 47 (2018): 05002. http://dx.doi.org/10.1051/e3sconf/20184705002.

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Coastal waters of Teluk Penyu-Cilacap district is an enlarging area for many species of fish larvae. The waters is directly influenced by the physical, chemical and biological of Indian Ocean patterns. Fish communities inhabit in gulf waters to take advantage of the high productivity in the coastal waters to support their livelihoods. The gulf area is usually associate with other productive ecosystems i.e. rivers that empties into it and mangrove forests. The study aim is to analyze the influence of oceanography pattern to the existence of ichthyoplankton [fish larvae] inhabit at Teluk Penyu waters of Cilacap district. Sampling is conducted monthly from April - June 2009 at 3 sites. The sites were set 1 mile of distance from coastline at Teluk Penyu Cilacap, PPSC and RSPC waters. Fish larvae were collected using larvae net mesh size 0.5 mm and 75 cm mouth diameter and phytoplankton and zooplankton are collected using plankton net . Larvae net was towed on the surface of the waters using a motorized boat with a speed 1 knot. Data were analyzed statistically based on Principal Components Analysis/PCA. 30 species of phytoplankton and 25 species of zooplankton species were identified from the waters. The species of phytoplankton and zooplankton were obtained difference species at each site. The highest abundance of phytoplankton were species of Chaetoceros and the abundance of zooplankton from the highest subsequence are species of Coelosphaerium dubium and Platydorina. The highest of relative abundance of ichthyoplankton in Teluk Penyu tourism waters was obtained 41,463% of the crawfish [Crumrnophthalmus spp.], followed by pheasant fish [Auriglobus nefastus] 8.53667%, and swordfish (Chirocentrus dorab spp.) 2.439%, and fish beloso [Tumbilic saurida] and gulamah fish (Johnius dussumieri) which are 1.2195%. The abundance of phytoplankton and zooplankton associated to ichthyoplankton abundance. The Southern of Teluk Penyu gulf waters was highest abundance area of ichthyoplankton.

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Klimova, T. N., I. V. Vdodovich, Yu A. Zagorodnaya, and V. S. Dotsenko. "Ichthyoplankton of Feodosiya bay in December 2006." Journal of Ichthyology 49, no. 2 (March 2009): 193–99. http://dx.doi.org/10.1134/s0032945209020064.

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Garavelli, L., A. Gruss, B. Grote, N. Chang, M. Smith, P. Verley, E. K. Stenevik, D. M. Kaplan, and C. Lett. "Modeling the dispersal of Cape hake ichthyoplankton." Journal of Plankton Research 34, no. 8 (May 29, 2012): 655–69. http://dx.doi.org/10.1093/plankt/fbs039.

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Mavruk, Sinan, and Dursun Avşar. "Distribution dynamics of ichthyoplankton and recruitment hypotheses." Ege Journal of Fisheries and Aquatic Sciences 34, no. 3 (September 26, 2017): 355–61. http://dx.doi.org/10.12714/egejfas.2017.34.3.16.

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LETT, C., P. VERLEY, C. MULLON, C. PARADA, T. BROCHIER, P. PENVEN, and B. BLANKE. "A Lagrangian tool for modelling ichthyoplankton dynamics." Environmental Modelling & Software 23, no. 9 (September 2008): 1210–14. http://dx.doi.org/10.1016/j.envsoft.2008.02.005.

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38

Demirel, Nazli. "Ichthyoplankton dynamics in a highly urbanized estuary." Marine Biology Research 11, no. 7 (March 4, 2015): 677–88. http://dx.doi.org/10.1080/17451000.2015.1007873.

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Greve, Wulf, Sabine Prinage, Heike Zidowitz, Jutta Nast, and Frank Reiners. "On the phenology of North Sea ichthyoplankton." ICES Journal of Marine Science 62, no. 7 (January 1, 2005): 1216–23. http://dx.doi.org/10.1016/j.icesjms.2005.03.011.

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Abstract The timing of fish larvae abundance was investigated at Helgoland Roads in the southern North Sea for the years 1990, 1993–1996, 1998, and 1999. From the 44 species identified, 27 were sufficiently abundant in more than 3 years and had well defined seasonal changes to calculate their phenology. The passage of the 15%, 50%, and 85% annual cumulative abundance thresholds was used to define the “start of season”, “middle of season”, and “end of season”, respectively. The timing of a significant number of these events was correlated with the mean annual winter sea surface temperatures (SSTs) in weeks 1–10 with higher temperatures leading to earlier appearance. The timing of the end of season was also negatively correlated with the SSTs. Sole (Solea solea) is presented as an example of the general functional relationship.

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Helbig, J. A., and P. Pepin. "Partitioning the influence of physical processes on the estimation of ichthyoplankton mortality rates. I. Theory." Canadian Journal of Fisheries and Aquatic Sciences 55, no. 10 (October 1, 1998): 2189–205. http://dx.doi.org/10.1139/f98-087.

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This paper examines the effects of natural spatial-temporal variability in ichthyoplankton concentration and in currents on the estimation of mortality rates. We derive expressions for the biases and variances of mortality estimates computed from the change in plankton concentration between successive surveys as well as estimates of the corrections due to the advection of plankton. We demonstrate that estimate bias depends primarily on how well the mean current and mean ichthyoplankton fields are sampled whereas the variance depends on the variability about the mean in currents and plankton concentration and on the time and length scales on which this variability occurs. Simplified versions of the theoretical expressions provide an easily implemented framework for evaluating the quality of field sampling plans.

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Kallianiotis, Athanasios A., Nikolaos Kamidis, Anastasios Tselepides, and Ioannis E. Batjakas. "Spatiotemporal and Environmental Dynamics of Abundances and Diversity of Larval Fish in Artificial Reef Edge Habitats of Kitros, Pieria (Northern Aegean Sea, Eastern Mediterranean)." Journal of Marine Science and Engineering 11, no. 1 (December 28, 2022): 40. http://dx.doi.org/10.3390/jmse11010040.

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Spatiotemporal and physiochemical influences on the abundances and diversity of ichthyoplankton were assessed in the Thermaikos Gulf and edge habitats surrounding the Pieria (Northern Greece) artificial reef complex. The collection of data was performed in edge habitats in the marine protected area near the artificial reef offshore of Kitros. Sampling trips occurred in each season of the spring, summer, and autumn in each year from 2015–2017. This artificial reef complex lies at a distance offshore of 11.5 km from Kitros and the delta of River Aliakmonas. A bongo net sampler was used to sample ichthyoplankton over a network of 16 sampling stations. Seventy species of larval fish were identified. The greatest measures of ichthyoplankton diversity were found during warmer seasons. Non-metric multidimensional scaling showed that seasons play a significant role in species assemblages, as months during the spring, summer, and autumn from different years clustered together. Ten groups of larvae were identified to the family or genus level, such as Arnoglossus spp., Callionymus spp., Crenilabrus spp., Gobius spp., Liza spp., Scorpaena spp., Solea spp., and Spicara spp. Overall, the species with the greatest abundance was the larvae of the European anchovy (Engraulis encrasicolus). The second genera (in order of highest abundance) were Gobius spp. followed by relatively abundant (but lesser numbers of) larvae representing the families Callionymidae, Centracanthidae, and Bothidae. The largest total abundances were found in July 2015 and September 2016. The biodiversity index indicated that measures of diversity were greater in July 2015, which was the only sampling performed in the middle of the summer, and indicated higher diversity in autumn 2015. The aim of this study was to present the assemblages of fish larvae in the marine protected area surrounding the artificial reef of Kitros Pierias as the result of a 3-year sampling program (2015–2017). The novelty of this study is that it is the only study of Ichthyoplankton ever performed in Greece with seasonal repetitions and densely located stations around a coastal marine protected area.

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Vdodovich, I. V., P. S. Podrezova, and T. N. Klimova. "Fish larvae as food item of planktonic predator (Chaetognatha)." Marine Biological Journal 3, no. 3 (September 28, 2018): 94–96. http://dx.doi.org/10.21072/mbj.2018.03.3.10.

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Photos of predation of sagitta (Chaetognatha) to fish larvae are presented for the first time for the Black Sea. While analyzing ichthyoplankton samples obtained in May and November in 2017 (94ᵗʰ and 98ᵗʰ cruises of RV “Professor Vodyanitsky”) several sagittas were found with their guts containing fish larvae. Fish larvae seem to have been captured by sagittas in the same way as sagittas in cannibalism cases, with both folding in half at the spot of capture. The data obtained allow us to assume sagittas in conditions of high abundance of eggs and fish larvae in the plankton to be not only a food competitor of larvae and juveniles of fish, as a fodder plankton consumer, but an active predator, being able to play a significant role in the elimination of ichthyoplankton.

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Richardson, David E., Jonathan A. Hare, William J. Overholtz, and Donna L. Johnson. "Development of long-term larval indices for Atlantic herring (Clupea harengus) on the northeast US continental shelf." ICES Journal of Marine Science 67, no. 4 (December 16, 2009): 617–27. http://dx.doi.org/10.1093/icesjms/fsp276.

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Abstract Richardson, D. E., Hare, J. A., Overholtz, W. J., and Johnson, D. L. 2010. Development of long-term larval indices for Atlantic herring (Clupea harengus) on the northeast US continental shelf. – ICES Journal of Marine Science, 67: 617–627. The incorporation of data from ichthyoplankton programmes into the stock assessment process has lagged far behind the use of data from comparable adult-monitoring programmes. This can in part be attributed to a mismatch between established analytical approaches to larval-index development and the inconsistencies in sampling for many long-term ichthyoplankton datasets. Along the northeast US continental shelf, ichthyoplankton surveys have been carried out by the Northeast Fisheries Science Center (NMFS/NOAA) multiple times annually since 1971, but the spatial and seasonal allocation of sampling has varied substantially. Here, we present a non-linear least-squares approach to larval-index development. We use the age structure and abundance of larvae on each survey to derive the larval index, along with parameters describing the survival of larvae and the seasonal cycle of hatching. Application to Atlantic herring (Clupea harengus) revealed a large drop in the index around 1976, an increase in the index through the late 1980s, and another large drop in 2004. This index was correlated with the stock assessment estimate of Atlantic herring spawning-stock biomass from 1971 to 2003, but differed substantially during 2004. Our results demonstrate that our approach to larval-index development is flexible to the inconsistencies in sampling effort.

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Lamia, Diouri, Uwiringiyeyezu Théophile, Abdelouahab Hinde, Malki Mohamed, Baibai Tarik, and Soukri Abdelaziz. "Comparison and Validation of Ichthyoplankton DNA Extraction Methods." Methods and Protocols 4, no. 4 (December 6, 2021): 87. http://dx.doi.org/10.3390/mps4040087.

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Ichthyoplankton is the cluster of planktonic organisms that consists of fish eggs and larvae. These planktonic stages belong to the temporary zooplankton, representing future exploitable stocks. The study of the early ontogenesis of fish plays a key role in the understanding and evaluation of these populations through the study of their abundance and their spatio-temporal distribution. To better understand and protect these fisheries resources, it is essential to identify the different stages of fish embryonic development. This identification is usually performed using the classical method, based on morphological criteria under a binocular magnifying glass; however, this methodology is not always sufficient and is time consuming and, therefore, it is necessary to rely increasingly on molecular tools. The major problem with these tools is the yield and quality of the nucleic acids extracted from ichthyoplankton, especially in the case of eggs, which are small. Several methods have been used for DNA extraction from ichthyoplankton, either automated or manual, but very often from larvae or adults. In the present work, five fish egg DNA extraction protocols were compared based on their DNA yield and extraction quality, verified by agarose gel electrophoresis and quantitative PCR amplification. The results showed that extraction by our heat-protocol for direct PCR (Hp-dPCR) presents the simplest and cheapest protocol of all the kits used in this study, providing a sufficient quantity and quality of nucleic acids to be used for PCR amplification, and being within the reach of third world laboratories that often do not have sufficiently large budgets to obtain automated kits.

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Peabody, CE, AR Thompson, DF Sax, RE Morse, and CT Perretti. "Decadal regime shifts in southern California’s ichthyoplankton assemblage." Marine Ecology Progress Series 607 (December 6, 2018): 71–83. http://dx.doi.org/10.3354/meps12787.

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Meador, Michael R., and James S. Bulak. "Quantifiable Ichthyoplankton Sampling in Congested Shallow-Water Areas." Journal of Freshwater Ecology 4, no. 1 (June 1987): 65–69. http://dx.doi.org/10.1080/02705060.1987.9665162.

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Arkhipov, A. G. "Seasonal and interannual variation of ichthyoplankton off Mauritania." Journal of Ichthyology 49, no. 6 (July 2009): 460–68. http://dx.doi.org/10.1134/s0032945209060058.

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Saushkina, Daria Ya. "THE ICHTHYOPLANKTON OF AVACHINSKAYA BAY IN 2014–2017." Researches of the aquatic biological resources of Kamchatka and of the north-west part of the Pacific Ocean, no. 55 (December 23, 2019): 126–37. http://dx.doi.org/10.15853/2072-8212.2019.55.126-137.

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Horstman, K. "Ichthyoplankton distribution and abundance in the Celtic Sea." ICES Journal of Marine Science 51, no. 4 (November 1994): 447–60. http://dx.doi.org/10.1006/jmsc.1994.1046.

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Lopes, Rubens M., Mario Katsuragawa, June F. Dias, Mónica A. Montú, José H. Muelbert, Charles Gorri, and Frederico P. Brandini. "Zooplankton and ichthyoplankton distribution on the southern Brazilian shelf: an overview." Scientia Marina 70, no. 2 (June 30, 2006): 189–202. http://dx.doi.org/10.3989/scimar.2006.70n2189.

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Journal articles on the topic 'Ichthyoplankton'

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