Letteratura scientifica selezionata sul tema "Artificial fish habitats"
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Articoli di riviste sul tema "Artificial fish habitats"
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Mellin, C., and D. Ponton. "Assemblages of reef fish settling on artificial substrates: effect of ambient habitat over two temporal scales." Marine and Freshwater Research 60, no. 12 (2009): 1285. http://dx.doi.org/10.1071/mf08319.
Testo completoAbstract (sommario):
Artificial habitats provide a unique opportunity to investigate how habitat characteristics structure juvenile fish assemblages after settlement. We quantified the differences between assemblages of juvenile fish on artificial substrates moored in macroalgal beds, seagrass beds or coral patches over two temporal scales that corresponded to a short (48 h) and a longer (>2 weeks) immersion time, respectively. The highest abundances were obtained from artificial habitats moored in seagrass beds, whatever the immersion time was. Total abundances of juveniles increased 3-fold between a short and a long immersion, suggesting a net accumulation of individuals with time. Moreover, significant differences in juvenile fish assemblage structure were observed between habitats and between immersion times. Artificial habitats may reflect species-specific habitat preferences at settlement at a meso-scale; however, caution must be paid to the effects of ambient habitat and post-settlement processes on juvenile fish assemblages observed on artificial habitats.
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McIntyre, Alasdair D. "Artificial habitats for fish." Marine Pollution Bulletin 19, no. 3 (1988): 139–40. http://dx.doi.org/10.1016/0025-326x(88)90713-8.
Testo completo
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Pereira, Pedro Henrique Cipresso, Marcus Vinicius Bezerra dos Santos, Daniel Lino Lippi, Pedro Henrique de Paula Silva, and Breno Barros. "Difference in the trophic structure of fish communities between artificial and natural habitats in a tropical estuary." Marine and Freshwater Research 68, no. 3 (2017): 473. http://dx.doi.org/10.1071/mf15326.
Testo completoAbstract (sommario):
The present study tested the hypothesis that artificial habitats (pier and bridge) harbour different fish trophic guilds compared with natural habitats (mangrove roots) and that the trophic structure of fish communities on estuarine artificial habitats resembles adjacent coral reefs. High-definition cameras were used to survey the fish community associated with the different structures over a 6-month period. Benthos was also analysed following the point intercept method on the different habitats. In the estuary, fish abundance was up to threefold higher and species richness twofold higher on artificial structures compared with the natural habitat. Mangrove roots were mainly inhabited by juvenile carnivores, whereas the pier and bridge were mostly inhabited by sessile invertebrate feeders and roving herbivores. A less diverse benthic community was found on mangrove roots, mostly composed of mud and algae. In contrast, benthos at the bridge and pier was more diverse and dominated by sponges, octocorals and oysters. In addition, fish trophic structure from an adjacent coral reef area showed more than 60% similarity with the fish community on the artificial structures surveyed. The results of the present study indicate that artificial hard structures support unique fish communities compared with natural estuarine mangrove habitats.
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Budijono, Budijono, Ridwan Manda Putra, Muhammad Fauzi, et al. "Observations of fish species diversity in floating artificial habitats in Koto Panjang reservoirs, Indonesia." BIO Web of Conferences 136 (2024): 03008. http://dx.doi.org/10.1051/bioconf/202413603008.
Testo completoAbstract (sommario):
Monitoring the diversity of fish species in artificial floating habitats that are continuously tested in the waters of the Koto Panjang Reservoir is important to assess the current availability of fish species resources. This study aims to evaluate the increase in fish species in the different artificial floating habitat structures that were tested. This study was conducted from November 2023 to June 2024 in the Koto Panjang Reservoir on 9 existing floating habitat structures. Each structure has 8 attractors with media (raffia rope, plastic rope, packaging bottles) hung at a depth of 2 m. Each structure is equipped with 4 traps to catch fish every month, then counted and identified according to applicable procedures. The catch in all artificial habitats was 189 fish with a total of 21 species from the previous 16 species. The largest number of fish remained in the raffia rope media at 100% and the lowest in the strapping band at 76,2%. Meanwhile, the types of fish found in the reservoir waters were 32 species from the 44 species that had been recorded from previous research. It was concluded that raffia rope media is a media preferred by fish in artificial floating habitats.
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García-Salines, Laura, and Pablo Sanchez-Jerez. "Comparing the Structure of Fish Assemblage among Natural and Artificial Shallow Rocky Habitats." Oceans 5, no. 2 (2024): 244–56. http://dx.doi.org/10.3390/oceans5020015.
Testo completoAbstract (sommario):
Artificial coastal structures, such as seawalls, breakwaters, and groins, can exert various impacts on the fish communities in the nearby regions. This study focuses on assessing the ecological effects of coastal infrastructure on marine environments, by comparing, at different seasons, the habitat complexity and heterogeneity, as well as their effects on fish assemblages, between the artificial habitat created with the intention of constructing a marina (Puerto Amor) and the natural habitats surrounding the Cabo de la Huerta area in Alicante (Spain). Employing an asymmetric design and examining two temporal and spatial scales, we utilized visual censuses in snorkeling to gauge the abundance and size of fish species, alongside various parameters related to habitat complexity and heterogeneity. The overarching hypothesis is that fish populations associated with artificial habitats will differ in terms of abundance, biomass, species richness, and diversity compared to fish populations associated with natural habitats, due to changes in complexity and heterogeneity. The findings indicate a shift in fish assemblages; for example, the family Labridae showed differences between the two habitat types for several species. These changes were due to the influences of the Posidonia oceanica meadow and algae like Jania rubens; being influenced by biological variables such as Ellisolandia elongata, Oculina patagonica, and Sarcotragus spinosulus; as well as physical variables such as stones, gravel, and blocks. While there is evidence of alteration in fish assemblages due to changes in habitat structure, there is also an increase in richness (9 species/m2) and total abundance and biomass (1000 ind./m2 and 1700 g/m2, respectively) in the artificial habitat. Multivariate analyses reveal that the fish community in Puerto Amor is less homogeneous than the one in the natural habitat. However, these analyses also indicate an overlap between the communities of both habitats, suggesting substantial similarity despite the noted differences. Consequently, although the habitat alteration has impacted fish populations, it has not diminished abundance, biomass, or species richness. In conclusion, the artificial rocky habitat resulting from the construction attempt at Puerto Amor harbor has fish populations with ecological significance and its removal could lead to undesirable impacts in the area, as the fish assemblages have become well established.
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Flávio, Hugo, Rochelle Seitz, David Eggleston, Jon C. Svendsen, and Josianne Støttrup. "Hard-bottom habitats support commercially important fish species: a systematic review for the North Atlantic Ocean and Baltic Sea." PeerJ 11 (January 17, 2023): e14681. http://dx.doi.org/10.7717/peerj.14681.
Testo completoAbstract (sommario):
Hard-bottom habitats span a range of natural substrates (e.g., boulders, cobble) and artificial habitats (e.g., the base of wind turbines, oil platforms). These hard-bottom habitats can provide a variety of ecosystem services, ranging from the enhancement of fish biomass and production to providing erosion control. Management decisions regarding the construction or fate of hard-bottom habitats require information on the ecological functions of these habitats, particularly for species targeted in ecosystem-based fisheries management. This study provides a systematic review of the relationships of various hard-bottom habitats to individual commercially harvested species that are managed jointly across the Atlantic by the International Council for the Exploration of the Sea (ICES). We systemically reviewed peer-reviewed publications on hard-bottom habitats including both natural and artificial reefs, after applying various exclusion criteria. Most studies were conducted on near-shore hard-bottom habitats, and habitat importance varied according to fish species and region. We quantified the frequency with which studies demonstrate that natural and artificial hard-bottom habitats function as spawning grounds, settlement and nursery areas, and foraging grounds, as well as provide stepping-stones during migration, or new home ranges. Hard-bottom habitats generally support higher fish densities than surrounding habitat types, although not all fish species benefit from hard-bottom habitats. Of the commercially important species, cod (Gadus morhua) was the most frequently studied species, with enhanced biomass, density, feeding, and spawning on hard-bottom habitats compared to unstructured habitats. Moreover, hard-bottom habitats appear to be of particular importance for spawning of herring (Clupea harengus). Collectively, data indicate that loss of hard-bottom habitats may translate into less-favourable conditions for spawning and biomass of diverse commercial species, including cod and herring.
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Paxton, Avery B., and Derek Smith. "Visual cues from an underwater illusion increase relative abundance of highly reef-associated fish on an artificial reef." Marine and Freshwater Research 69, no. 4 (2018): 614. http://dx.doi.org/10.1071/mf17179.
Testo completoAbstract (sommario):
Cues from visual, auditory and olfactory stimuli affect habitat selection by reef fish, yet questions remain regarding how fish use visual cues to select habitats. With growing numbers of human-made structures, such as artificial reefs, deployed on ocean floors, understanding how visual cues influence fish selection of human-made habitats is timely. We conducted a field experiment to test whether visual stimuli influenced the relative abundance of fish on an artificial reef. We discovered that visual cues from an illusion created by a mirror installed on the reef increased the relative abundance of highly reef-associated fish. Specifically, when exposed to the mirror, numbers of highly reef-associated fish increased 35% relative to an experimental control treatment with a transparent added structure and 54% relative to a full control without an added structure. These results demonstrate that visual cues, such as illusions of additional habitat and more fish, can entice more highly reef-associated fish to use artificial reefs and play a more substantial role in habitat selection than the effects of added physical structures alone. As numbers of human-made marine structures continue to increase, simple augmentations enhancing visual evidence of available habitat structure or relative fish abundance may serve to increase the local abundance of fish.
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Langhamer, Olivia. "Artificial Reef Effect in relation to Offshore Renewable Energy Conversion: State of the Art." Scientific World Journal 2012 (2012): 1–8. http://dx.doi.org/10.1100/2012/386713.
Testo completoAbstract (sommario):
The rapid worldwide growth of offshore renewable energy production will provide marine organisms with new hard substrate for colonization, thus acting as artificial reefs. The artificial reef effect is important when constructing, for example, scour protections since it can generate an enhanced habitat. Specifically, artificial structures can create increased heterogeneity in the area important for species diversity and density. Offshore energy installations also have the positive side effect as they are a sanctuary area for trawled organisms. Higher survival of fish and bigger fish is an expected outcome that can contribute to a spillover to outer areas. One negative side effect is that invasive species can find new habitats in artificial reefs and thus influence the native habitats and their associated environment negatively. Different scour protections in offshore wind farms can create new habitats compensating for habitat loss by offshore energy installations. These created habitats differ from the lost habitat in species composition substantially. A positive reef effect is dependent on the nature and the location of the reef and the characteristics of the native populations. An increase in surface area of scour protections by using specially designed material can also support the reef effect and its productivity.
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Bi, Sheng, Han Lai, Dingli Guo, et al. "The Characteristics of Intestinal Bacterial Community in Three Omnivorous Fishes and Their Interaction with Microbiota from Habitats." Microorganisms 9, no. 10 (2021): 2125. http://dx.doi.org/10.3390/microorganisms9102125.
Testo completoAbstract (sommario):
Artificial fishery habitats have been extensively used for fishery resource protection and water habitat restoration, and they could attract a large number of omnivorous fishes to gather together. This study intended to reveal the relationship between bacterial communities in the habitats (water and sediment) and intestines of omnivorous fishes (Oreochromis mossambicus, Toxabramis houdemeri and Hemiculter leucisculus). Therefore, we investigated the bacterial communities of samples collected from intestines, water, and sediments in artificial fishery habitats via 16S rRNA metabarcoding high-throughput sequencing technology. The results showed that there were significant differences in the composition, core indicators, diversity and prediction functions in water, sediments, and intestinal microbial communities of the three omnivorous fish. The microbial diversities were significantly higher in habitats than in intestines. The analysis of similarity (ANOSIM) and nonmetric multidimensional scaling (NMDS) results indicated that the intestine microbial communities (T. houdemeri and H. leucisculus) were more similar to the water microbiota, but the intestine microbial communities (O. mossambicus) were more similar to the sediments. Source tracking analysis also confirmed that the contribution of habitat characteristics to omnivorous fish intestinal microorganisms was different; the sediment had a greater contribution than water to the intestinal microbiota of O. mossambicus, which was consistent with their benthic habit. Moreover, the functional prediction results showed that there were unique core indicators and functions between the bacterial community of habitats and intestines. Altogether, these results can enhance our understanding of the bacterial composition and functions about omnivorous fish intestines and their living with habitats, which have provided new information for the ecological benefits of artificial fishery habitats from the perspective of bacterial ecology and contributed to apply artificial fishery habitats in more rivers.
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Radford, C. A., C. J. Sim-Smith, and A. G. Jeffs. "Can larval snapper, Pagrus auratus, smell their new home?" Marine and Freshwater Research 63, no. 10 (2012): 898. http://dx.doi.org/10.1071/mf12118.
Testo completoAbstract (sommario):
The ability to find a suitable settlement habitat after a pelagic larval period represents a significant challenge to marine settlement-stage larvae, and the mechanisms by which they achieve this are poorly understood. There is good evidence that olfactory cues are used by some coral reef fish larvae to locate suitable settlement habitats; however, the same understanding is lacking for marine temperate fish. Here we show for the first time that the larvae of an important commercial and recreational marine temperate fish, Pagrus auratus, can use olfactory cues to orient to appropriate settlement habitat. Using pairwise choice experiments, naive hatchery reared fish were offered water collected from a range of habitats in the Kaipara Harbour, an important nursery area for P. auratus. Larvae selected to swim towards water taken from over seagrass beds, their preferred settlement habitat, than water taken from the harbour entrance, Asian date mussel habitat, artificial seawater or artificial seawater in which seagrass had been soaked. The preference by the fish for water from the seagrass habitat over artificial seawater in which seagrass had been soaked strongly suggests that chemical cues from sources other than seagrass, such as from prey or conspecifics present in the seagrass habitat, may also be involved.
Tesi sul tema "Artificial fish habitats"
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Patranella, Allison. "Artificial Reefs as Juvenile Fish Habitats in Marinas." NSUWorks, 2016. http://nsuworks.nova.edu/occ_stuetd/423.
Testo completoAbstract (sommario):
Coastal infrastructure has replaced many vital fish nursery habitats with structures designed without fully mitigating for the loss of the natural ecosystems. This thesis details research focused on the use of small, inexpensive, artificial reef modules as replacement juvenile fish habitat within marinas. My research hypothesis was that the placement of small, structurally complex artificial reef modules would increase fish abundance and species richness relative to unmodified marina seawalls. Non-destructive visual surveys of fishes were completed monthly for 14 months for 12 artificial reef sites and 12 control (unmodified) sites within the Nova Southeastern University Guy Harvey Oceanographic Center (NSU-GHOC) marina. Divers recorded species, abundance, and size class (0-2 cm, >2-5 cm, >5-10 cm, >10-20 cm, >20-30 cm, >30-50 cm, >50 cm) for all sites. Data was statistically analyzed using analysis of variance (ANOVA) and post-hoc Student Newman-Keuls (SNK) tests to explore differences in mean abundance, mean species richness, and mean abundance and species richness by size class and month. Total mean fish abundance and mean species richness (all months and sizes combined) were both significantly higher at artificial reef sites than at control sites. Artificial reef sites were consistently higher in total abundance and species richness when analyzed by month. Analysis of mean abundance by size class found the >2-5 cm, >5-10 cm, >10-20 cm and >20-30 cm classes were significantly higher for artificial reef sites. Species richness analysis by size class found classes >2-5 cm, >5-10 cm, >10-20 cm, and >20-30 cm were significantly higher at artificial reef sites. Fishes from the grunt (Haemulidae) and snapper (Lutjanidae) families contributed the most to the total abundance for both types of sites. These results support my hypothesis and have important implications for mitigating ecological impact to coastal fish nursery areas with the use of artificial structure.
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Brickhill, Michael John. "Enhancement of Fish Stock by Habitat Manipulation in Artificial Waterways." Thesis, Griffith University, 2009. http://hdl.handle.net/10072/367810.
Testo completoAbstract (sommario):
Two widely-recognised hypotheses propose that increases in fish abundance at artificial reefs are caused by: (a) the attraction and redistribution of existing individuals; and/or (b) the addition of new individuals by production. Inadequate experimental designs compromised by a lack of sufficient replication and/or spatial interspersion of reefs with controls have prevented researchers from distinguishing between attraction and production. Infrequent sampling has also led to insufficient temporal coverage of life history-driven variations in fish abundance and biomass at reefs. Detection and resolution of these trends, together with incorporation of fish age/length data, and the use of techniques such as stable isotope analysis to infer trophic link(s) between reef residents and potential sources of epibenthic nutrition at reefs should help demonstrate mechanisms underlying attraction and/or production.
Given that fish numbers tend to increase after artificial reef deployments, artificial reefs have been proposed as a means by which fish stocks could be enhanced by providing new habitat in areas where natural habitat vital for feeding, shelter and reproduction have been removed, such as residential canals. The purpose of my study was to investigate whether or not artificial reefs could be used to enhance fish production within residential canals.
Five reefs were deployed into Lake Rumrunner on the Gold Coast in southeast Queensland, Australia (28°02’59”S, 153°25’19”E). Reefs were interspersed among five soft sediment (control) sites of similar depth. Fish assemblages at reefs, controls and shoreline jetties were quantitatively sampled using a modified seine pop net. Very few fish were recorded at controls, but fish abundance and biomass increased dramatically at reefs shortly after deployment, stabilising at levels above that of shoreline jetties.
Reefs and jetties accommodated different fish assemblages and assemblage structure varied through time. Multivariate analyses indicated that the fish assemblage at jetties within Lake Rumrunner differed from assemblages at jetties in adjacent lakes in terms of biomass composition, accommodating numerous individuals of small-bodied species. The fish assemblage at reefs featured individuals of large-bodied species and occasional, itinerant individuals of species typical of offshore subtidal reefs.
Among co-occurring (reef and jetty) fish species, strong differences in the distribution of Monodactylus argenteus (Monodactylidae) between reefs, jetties and controls suggested possible new production driven by reef deployment. Abundance and biomass of M. argenteus was significantly greater at reefs relative to controls (where no fish were caught) and jetties at all times after deployment. Individuals were consistently larger on reefs than on jetties. Analyses of length-frequency distributions through time indicated the size of individuals differed from one sampling time to the next for most sampling times at reefs, possibly representing cohort growth and movement through time...<br>Thesis (PhD Doctorate)<br>Doctor of Philosophy (PhD)<br>School of Environment<br>Science, Environment, Engineering and Technology<br>Full Text
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Bouchoucha, Marc. "Les zones portuaires peuvent-elles servir de nourriceries alternatives pour les poissons marins côtiers ? : cas des sars en Méditerranée Nord-occidentale." Thesis, Perpignan, 2017. http://www.theses.fr/2017PERP0046/document.
Testo completoAbstract (sommario):
Au cours de leur cycle de vie, la plupart des espèces de poissons marins côtiers passent par des nourriceries littorales dont la qualité influence largement le succès du recrutement et donc le maintien de l’abondance de leurs populations. Or, la construction de ports entrain irrémédiablement une perte de fonction pour les habitats côtiers impactés. Dans ce contexte,l’objectif général de cette thèse était de voir si les zones portuaires peuvent malgré tout servir de nourriceries alternatives pour les poissons marins côtiers. Pour cela, les abondances des juvéniles de quatre espèces de sars, du genre Diplodus, ont d’abord été suivies dans cinq ports méditerranéens. Ceci a permis de montrer que ces espèces côtières peuvent s’installer et grandir avec succès dans les ports. La complexification de la structure 3D de l’habitat augmente sensiblement les abondances de juvéniles. Dans un second temps, la croissance, la condition et les niveaux de contamination desjuvéniles de deux espèces de sars (D. sargus et D. vulgaris) ont été comparés entre différents ports et habitats naturels de la rade de Toulon. Ceci a montré que la croissance et la condition des juvéniles peut être équivalente dans certains ports et dans les zones naturelles adjacentes, avec des niveaux de contamination faibles, même dans les zones les plus polluées. Enfin, la composition multi- élémentaire des otolithes des juvéniles de D. sargus et D. vulgaris a été comparée entre trois ports et deux zones naturelles de la rade de Toulon. Aucun élément chimique lié aux activités portuaires n’aété retrouvé en plus forte concentration dans les otolithes des juvéniles issus des ports. Il n’existe donc pas une signature unique caractéristique de l’ensemble des ports. La composition chimique des otolithes peut néanmoins être utilisée pour étudier la contribution relative des ports aux stocks d’adultes à condition de caractériser la signature de l’ensemble des habitats juvéniles potentiels. L’ensemble des résultats acquis indiquent que les ports peuvent être utilisés comme nourriceries alternatives par plusieurs espèces de poissons marins côtiers. Les projets d’ingénierie écologiquevisant à augmenter la complexité structurale des habitats portuaires sont des pistes intéressantes pour maintenir la biodiversité côtières et les stocks de poissons<br>During their life cycle, most of the marine coastal fish species use nursery grounds which quality influence their recruitment and then the conservation of their populations. However, the construction of ports impair irremediably fish nursery function of the coastal areas impacted. The ultimate aim of the PhD research was to assess if ports could provide suitable alternative nursery habitats for coastal fish species. Firstly, abundances of the juveniles of four Diplodus species were surveyed in five marinas located along the French Mediterranean coast. This showed that coastal fishes can successfully settle and grow inside these artificialized coastal areas. Moreover, increasing the complexity of port habitats can considerably enhance their suitability for juveniles, especially at the youngest stages. Secondly, body condition, growth rate and metal contamination in the juveniles of two Diplodus species (D. sargus and D. vulgaris) were compared between different ports and natural areas in the Bay of Toulon. Juvenile growth and condition can be equivalent between fish collected from ports and from adjacent natural areas. Contamination levels in fish were low, even in highly polluted areas. Finally, otolith composition in the juveniles of D. sargus and D. vulgaris was investigated in three ports and two natural areas in the Bay of Toulon. None of the port related had systematically higher concentrations in otoliths from Diplodus juveniles collected in ports. Therefore, otolith microchemistry cannot provide a unique and reliable fingerprint discriminating ports and natural areas. Nevertheless, otolith microchemistry could provide an effective natural tag to determine the contribution of ports to adult stocks provided that a library of all potential juvenile habitat fingerprints is established. All these results confirm that ports can be used as alternative nursery habitats by marine coastal fishes. Ecological engineering projects aiming at increasing structural complexity of port habitats seem promising for biodiversity and fish stock conservation
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Varenne, Alix. "Étude de la diversité des nurseries artificielles dans les zones portuaires et de leur connectivité trophique avec les écosystèmes adjacents." Electronic Thesis or Diss., Université Côte d'Azur, 2024. http://www.theses.fr/2024COAZ5044.
Testo completoAbstract (sommario):
Le développement côtier introduit des habitats artificiels qui impactent la biodiversité et le fonctionnement des écosystèmes. Les solutions d'ingénierie écologique, comme les habitats artificiels à poissons (HAP), peuvent réhabiliter des zones très modifiées, comme les ports, en offrant un abri aux poissons. Les HAP peuvent aussi fournir un substrat aux invertébrés et aux macroalgues, améliorant le fonctionnement de l'écosystème. Leurs effets pourraient aller au-delà des ports et modifier les échanges trophiques avec les habitats adjacents. Cette thèse étudie la biodiversité des invertébrés associés aux HAP et explore les échanges de biomasse entre les ports et les herbiers de Posidonia oceanica adjacents le long de la côte méditerranéenne française.Les objectifs sont : (1) évaluer comment la diversité et la composition des invertébrés benthiques varient avec le temps d'immersion des HAP, (2) comprendre comment les types d'HAP et le contexte environnemental modifient les assemblages benthiques, et (3) explorer les échanges de matière organique entre les ports et les herbiers adjacents. J'ai étudié les HAP Biohut® (ECOCEAN), composés d'une cage métallique remplie de coquilles d'huîtres, attachés aux quais ou sous les pontons dans les ports.Au chapitre 1, j'ai examiné le rôle du temps d'immersion des HAP sur la diversité et la composition des assemblages d'invertébrés dans 3 ports commerciaux. Des variations dans la composition des invertébrés ont été observées entre 6 et 18 mois d'immersion, avec une augmentation de l'abondance, de la richesse et de l'équitabilité au fil du temps. Au chapitre 2, j'ai étudié les variations géographiques et intra-portuaires de la composition et de la diversité des invertébrés. L'étude a révélé des différences dans la composition des taxons entre 2 régions caractérisées par des apports en nutriments différents et des corrélations entre la composition des assemblages et la chlorophylle-a, indicateur de la concentration en nutriments. Les assemblages d'invertébrés variaient aussi selon les zones où les HAP étaient installés, probablement à cause de différences d'accès à la lumière. Au chapitre 3, j'ai étudié la connectivité trophique entre les herbiers de P. oceanica et les ports adjacents sur 4 sites : 2 avec des ports équipés en HAP et 2 non équipés. Dans les sites non équipés, les valeurs δ15N de la matière organique particulaire à l'intérieur du port étaient les plus élevées, suggérant un enrichissement en nutriments d'origine humaine. Ces valeurs diminuaient dans les herbiers selon la distance, indiquant un effet de ces nutriments sur l'herbier proche de l'entrée du port. Les poissons (Diplodus spp.) pouvaient utiliser des ressources venant à la fois de l'herbier et du port de manière similaire sur les 4 sites. Les niches trophiques des poissons capturés dans le port équipé étaient légèrement plus grandes que celles des ports non équipés et se chevauchaient moins avec celles des poissons capturés à l'extérieur. Leurs fèces faisaient également partie de la matière organique sédimentaires des herbiers. Au chapitre 4, j'ai présenté des projets développés avec d'autres scientifiques sur la diversité fonctionnelle des espèces et les relations trophiques dans les HAP, des mesures bioacoustiques sur les AFH et une comparaison de la biodiversité entre les ports et les réserves marines à l'aide d'ADN environnemental.Mon travail a révélé des aspects susceptibles d'améliorer l'utilisation des HAP. La durée d'immersion, les conditions environnementales et les emplacements dans les ports doivent faire l'objet d'une attention particulière. Bien que je n'aie pas trouvé de différences claires dans les échanges entre habitats liés aux HAP, ces derniers semblent jouer un rôle en réduisant l'enrichissement en nutriments. L'importance des poissons dans les échanges entre habitats et le fait que les HAP favorisent leur survie suggèrent que ces HAP pourraient contribuer indirectement à la connectivité trophique<br>Coastal development modifies shorelines by introducing man-made habitats, which significantly impact coastal biodiversity and ecosystem functioning. Ecological engineering solutions, such as artificial fish habitats (AFH), can help rehabilitate extremely modified areas, including ports, by offering shelter for fish. As a side effect, AFH provide a substrate to benthic invertebrates and macroalgae, that could improve ecosystem functioning. The effects of AFH may also extend beyond ports and modify trophic exchange with adjacent habitats via fish feeding hydrodynamics. This thesis investigates the patterns of distribution of invertebrate biodiversity associated with AFH and explores the exchange of biomass between marinas and adjacent Posidonia oceanica meadows along the French Mediterranean coast where these habitats are often adjacent.The objectives are: (1) evaluating how taxonomic diversity and composition of benthic invertebrates vary with AFH immersion time, (2) understanding how AFH types and environmental context modify benthic assemblages, and (3) exploring the exchanges of organic matter between marinas and adjacent meadows. I focused on Biohut® AFH (ECOCEAN), made of a metal cage filled with oyster shells, attached to docks or under pontoons in harbours and marinas.In chapter 1, I examined the role of immersion time in determining the diversity and composition of invertebrate assemblages colonising AFH in 3 commercial harbours. The findings indicated significant variations in invertebrate composition from 6 to 18 months, with increased abundance, taxonomic richness, and evenness over time. In chapter 2, I focused on the geographical and within-port variability in taxonomic composition and diversity of invertebrates dwelling in AFH. The study revealed differences in taxa composition between 2 large regions, characterised by different nutrient loads and correlations between assemblage composition and chlorophyll-a, a proxy for nutrient concentration. The number of taxa was the highest in the nutrient-enriched region. Additionally, invertebrate assemblages varied according to port habitats where the AFH were placed, possibly due to differences in light availability. In chapter 3, I investigated trophic connectivity between P. oceanica meadows and adjacent marinas at 4 sites where both habitats are present. Two marinas were equipped with AFH and the remaining 2 were not. At the unequipped sites, the δ15N values of the particulate organic matter within the marina were the highest indicating human-derived nutrient enrichment. The values decreased within the meadow, gradually according to the distance. This suggests a spill of nutrients over the portion of the meadow adjacent to the inlet. Fish relied on resources from both the seagrass meadow and the marina, similarly among the 4 sites, however, the trophic niches of fishes (Diplodus spp.) captured within the equipped marina were slightly larger than those within unequipped ones and overlapped less with the trophic niches of the fish captured outside. Fish faeces were also part of the organic matter sedimenting within meadows. In chapter 4, I reported initiatives developed with other scientists. They include species functional diversity and trophic relations within AFH, acoustic signatures of organisms dwelling in AFH and biodiversity comparison between ports and marine reserves using environmental DNA.My work has highlighted several aspects that could improve the effectiveness of AFH as ecological engineering solutions. Immersion time, local environmental conditions, and specific locations within ports need particular attention. Although I did not find clear differences in cross-habitat exchange related to AFH, they seemed to play a role in reducing nutrient enrichment. Moreover, since fish play an important role in cross-habitat exchanges and find refuge within AFH, this ecological engineering solution could indirectly contribute to change trophic connectivity
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Lopez-Marcano, Sebastian E. "Measuring cross-habitat movements among habitat hotspots of fish with artificial intelligence." Thesis, Griffith University, 2022. http://hdl.handle.net/10072/414922.
Testo completoAbstract (sommario):
Connectivity, defined as the movement of individuals among populations or habitats, is a crucial ecological process that underpins the function of ecosystems. Animal movements promote a wide array of ecological outcomes, from genetic diversity to ecosystem recovery after disturbance. Therefore, it is necessary to have a clear understanding of the capabilities, scale, frequency, and locations of animal movements. In aquatic ecosystems, obtaining and analysing movement data is challenging because constantly changing environmental conditions hamper the use of traditional frameworks and methods. The study of animal movement in dynamic aquatic ecosystems also requires large volumes of data because animal movements cover different magnitudes, directions, and spatial levels of ecological organisation. As a result, new data collection and processing technologies are being developed to increase our understanding of this complex ecological process. Among new technologies, computer vision, machine learning and deep learning have received increased attention for their robust capabilities for rapidly processing large volumes of underwater imagery. Computer vision (CV) techniques are particularly suited to animal movement research because they can capture and process large amounts of raw data from underwater imagery. Despite their potential, CV techniques are only now beginning to be assessed in studies of aquatic animal movement, and their integration with appropriate statistical frameworks for behavioural analyses is required. In this thesis, I aim to identify, develop and apply CV techniques to measure animal movement in aquatic ecosystems. The focus is on measuring fish movements in connectivity corridors in estuarine systems. Fish movement research provides fundamental information about fisheries stocks, the status of protected areas, and the impact of habitat loss. Connectivity corridors are hotspots of fish migration, colonisation, feeding and reproduction. Yet much of fish behaviour in aquatic ecosystems remains hard to observe and timeconsuming to document manually. Connectivity corridors are a challenging but useful case study to test novel computer vision techniques for tracking fish. I first explored the current uses of CV techniques in fish movement studies and identified the benefits of CV for fish movement research. While the uptake of CV in fish movement studies has been slow, CV techniques provide two key benefits: 1) rapid, accurate and reliable datasets and 2) complementary information with traditional data collection techniques. Then, I developed a CV pipeline that automatically detects and tracks fish from underwater imagery. The pipeline has an 84% accuracy at detecting and subsequently tracking fish and provides large, raw movement datasets useful for ecological insight. To translate the raw movement data into behavioural events, I developed a new methodology for applying structural equation models to infer latent behavioural states of fish from observations of behavioural indicators. The statistical models accurately predicted behavioural events such as foraging (a slow, sinuous movement near the substrate) and fine-scale migrations (a fast, directional movement near the surface). Finally, I applied the CV pipeline to study the fine-scale movement and predation dynamics of fish at piped weirs in multiple estuaries. I used multi-species occupancy models to characterise fine-scale temporal changes in predator-prey co ccurrence and determined if behavioural differences could be detected at different categories of predator-prey co-occurrences. The fine-scale temporal changes of predator-prey co-occurrence varied among sampling days and locations, but I nevertheless identified that prey exhibited significantly different behaviours that depended on the probability of co-occurring predators. Overall, I bridged the gap between the development and application of new technologies for ecological research. CV can help us improve our understanding of critical interconnections among habitats and help researchers and managers increase data availability into conservation ecology and decision making. CV has the capacity to inform data-driven decisions that directly influence the health and productivity of marine ecosystems.<br>Thesis (PhD Doctorate)<br>Doctor of Philosophy (PhD)<br>School of Environment and Sc<br>Science, Environment, Engineering and Technology<br>Full Text
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Lee, Hing-kong Edwin. "Methods to assess fisheries enhancement by the deployment of artificial reefs (a case study at Hoi Ha Wan, Hong Kong) /." Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk/hkuto/record.jsp?B22264048.
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Mueller, Robert F. Jr. "Fish assemblages in the Wabash River : responses to substrate variation in field collections and artifical streams." Virtual Press, 2008. http://liblink.bsu.edu/uhtbin/catkey/1391677.
Testo completoAbstract (sommario):
Relationships between fish assemblage composition and substrate variation is poorly understood in large rivers. Information on fishes occurrence and behavior and substrate variation were examined in field observations for the Middle Wabash River and fine scale artificial streams experiments. The results from field observations suggested strong concordance for variation in abundance of fishes with habitat variation among sites, resulting in a longitudinal river gradient as dominant in the Middle Wabash River. In addition, shifts in fish behavior within artificial stream experiments demonstrated that species-specific habitat selection behaviors were influenced by interactions within a fish assemblage. The combination of artificial stream experiments and field observations can identify fine scale trends that bioassessment surveys cannot tease apart, and highlighting the need to examine species-habitat relationships at more than one scale.<br>Department of Biology
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Armono, Haryo Dwito. "Flow field around single and multiple hollow hemispherical artificial reefs used for fish habitat." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0030/MQ47434.pdf.
Testo completo
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Porter, Augustine Gus. "Habitat structural complexity in the 21st century: measurement, fish responses and why it matters." Thesis, The University of Sydney, 2019. http://hdl.handle.net/2123/20457.
Testo completoAbstract (sommario):
The physical shape or structure of a habitat is a key driver of species’ distributions and central to maintaining diversity through ecological niche differentiation. Anthropogenic influences are changing the structure of habitats and the assemblages of associated organisms globally. Understanding the links between the physical shape of habitats and the organisms they support will be essential to predicting and mitigating anthropogenic impacts. In marine ecosystems climate change, bottom trawling and marine infrastructure drive changes to the structure of habitats. While many of the observed and forecast changes to structure are incidental (e.g. loss of coral or addition of shoreline armouring), there are also concerted efforts to create ecologically beneficial structures. Ecologically informed engineering presents an opportunity to augment local ecology through changes to the physical structure of an environment. Yet much of the hard earned knowledge from past studies is not applicable to the design of habitats because structurally vague summary metrics are the standard. This aim of the research described in this study is to improve the mechanistic understanding of fish responses to structure, both natural and man-made, providing advice for the creation of future habitat and insight into the underlying ecological processes. These improvements in understanding the mechanistic relationships between fish distribution and habitat structural complexity bring us closer to actively managing habitats in the Anthropocene. By creating links between the metrics used for measuring habitat complexity and those used to create it, this thesis paves the way for further insight into building environments to augment local biota.
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梁懷彥 and Wai-yin Albert Leung. "Temporal trends in fish abundance and species composition on an open access artificial reef in Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B31244439.
Testo completoLibri sul tema "Artificial fish habitats"
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Cruz, Titto D'. Artificial fish habitats: Impact on artisanal fisheries. South Indian Federation of Fishermen Societies, 1995.
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Rigs-to-Reefs Special Session (1987 Miami, Fla.). Petroleum structures as artificial reefs: A compendium : Fourth International Conference on Artificial Habitats for Fisheries, Rigs-to-Reefs Special Session, Miami, Florida, November 4, 1987. U.S. Dept. of the Interior, Minerals Management Service, Gulf of Mexico OCS Regional Office, 1989.
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W, Murphey Stephen. North Carolina artificial reefs. North Carolina Dept. of Environment, Health and Natural Resources, Division of Marine Fisheries, 1991.
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Noble, Elizabeth B. The North Carolina artificial reef master plan. North Carolina Dept. of Natural Resources and Community Development, Division of Marine Fisheries, 1988.
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Viavant, Timothy Roland. Fish attraction to artificial structure in Chena Lakes [i.e. Lake], Alaska. Alaska Dept. of Fish and Game, Division of Sport Fish, 1995.
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Lewis, Robin D. A guide to the artificial reefs of Southern California. State of California, Resources Agency, Dept. of Fish and Game, 1989.
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Wilson, Kenneth C. Report of Pendleton artificial reef studies with recommendations for constructing a kelp reef. California Dept. of Fish and Game, Nearshore Sport Fish Habitat Enhancement Program, 1991.
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Bolding, Bruce. Use of artificial structure to enhance freshwater sportfish communities in lake, ponds and reservoirs: A literature review. Washington State Dept. of Fish and Wildlife, Inland Fish Investigations, Science Division, 2001.
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Reggio, Villere C. Rigs-to-reefs: The use of obsolete petroleum structures as artificial reefs. U.S. Dept. of the Interior, Minerals Management Service, Gulf of Mexico OCS Regional Office, 1987.
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Reggio, Villere. Rigs-to-reefs: The use of obsolete petroleum structures as artificial reefs. U.S. Dept. of the Interior, Minerals Management Service, Gulf of Mexico OCS Regional Office, 1987.
Cerca il testo completoCapitoli di libri sul tema "Artificial fish habitats"
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Castro-Fernández, Julia, José M. Disdier-Gomez, Olga Reñones, et al. "Using diver-operated stereo-video to monitor juvenile fish assemblages in Mediterranean coastal habitats formed by macrophytes." In Ninth International Symposium “Monitoring of Mediterranean Coastal Areas: Problems and Measurement Techniques”. Firenze University Press, 2022. http://dx.doi.org/10.36253/979-12-215-0030-1.55.
Testo completoAbstract (sommario):
Littoral systems with macrophytes are nursery areas for fish. We aim to develop a combination of stereo-video and habitat mapping methods for studying fish recruitment at various temporal and spatial scales. Some benefits are: videos are permanent and data can be used for developments of artificial intelligence. There are also disadvantages: cameras have a limited field of view and video processing is time-consuming. Introducing this methodology is of great importance to assess changes in the habitat structure and the ecosystem functions provided for the fish community.
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Hai, Tao, Jincheng Zhou, Hoorieh Ahmadi, et al. "Predicting Fish Habitat in the Persian Gulf Using Artificial Intelligence." In Lecture Notes in Networks and Systems. Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-37164-6_22.
Testo completo
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Hickley, P., and D. Harper. "Fish Community and Habitat Changes in the Artificially Stocked Fishery of Lake Naivasha, Kenya." In Management and Ecology of Lake and Reservoir Fisheries. Blackwell Publishing Ltd, 2007. http://dx.doi.org/10.1002/9780470995679.ch20.
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Akpolat, Veysi, and İrem Akpolat. "Radionuclides in Food." In Food Safety. Nobel Tip Kitabevleri, 2024. http://dx.doi.org/10.69860/nobel.9786053358787.24.
Testo completoAbstract (sommario):
Radiation can be found naturally or can be created by human-made artificial sources. Radioactive unstable elements divide to become stable, they release the excess energy in their nuclei to their surroundings by producing different types of radiation. This uranium, radium, thorium, potassium, etc. on earth. Cosmic rays coming from the sun and outer space, together with unstable elements, create a certain level of natural radiation in the environment. Therefore, natural radiation comes from many naturally occurring radioactive substances found in the soil, water, air and body in the environment where we spend our daily lives.The intake of natural radioisotopes into the body through digestion varies depending on the consumption rate of food and beverages and the radioisotope concentration. The concentration of radioisotopes naturally found in foods varies depending on the natural background levels, climate and agricultural practices of the region. Likewise, eating habits vary from region to region and country to country.All foods contain radionuclides, which are transferred from soil to crops on land and from water to fish in seas, lakes and rivers. Natural radionuclides in drinking water and food generally have very low levels and are safe for human consumption. In normal situations, a reference level of 1 mSv in a year applies to the individual radiation dose from the consumption of food. The same reference level applies separately to drinking water. These references are determined by the WHO/FAO Codex Alimentarius Commission has established “Guideline Levels” for radionuclides in foods destined for human consumption and traded internationally.
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"Marine Artificial Reef Research and Development: Integrating Fisheries Management Objectives." In Marine Artificial Reef Research and Development: Integrating Fisheries Management Objectives, edited by Sean F. Keenan, Theodore S. Switzer, Kevin A. Thompson, Amanda J. Tyler-Jedlund, and Anthony R. Knapp. American Fisheries Society, 2018. http://dx.doi.org/10.47886/9781934874516.ch9.
Testo completoAbstract (sommario):
<em>Abstract</em>.—Reef-fish assemblage structure was compared among multiple artificial and geologic (i.e., naturally occurring hard bottom) habitats in the northeastern Gulf of Mexico during 2014–2016 as part of a larger fishery-independent survey. Baited remote underwater video systems equipped with stereo cameras were deployed (<em>n </em>= 348) on 11 habitat types, classified through interpretation of side-scan sonar imagery. In the video samples, 11,801 fish were enumerated. Nonparametric analysis of reef-fish assemblages detected four clusters related to habitat; assemblages associated with geologic habitats were distinct, whereas the remaining three clusters represented groupings of artificial habitats of different size, scale, and complexity. While many species, including Vermilion Snapper <em>Rhomboplites aurorubens </em>and Red Snapper <em>Lutjanus campechanus</em>, were observed in greater numbers on artificial reef habitats, most species were observed in all habitats sampled. Among artificial reef habitats, the habitat cluster consisting of unidentified depressions, unidentified artificial reefs, construction materials, and reef modules was similar to geologic habitats in supporting larger individuals, specifically Gray Triggerfish <em>Balistes capriscus </em>and Red Snapper. In contrast, the habitat cluster consisting of smaller, generally solitary chicken-transport cages was inhabited by smaller individuals, including smaller Red Snapper. Although geologic reefs are the predominant reef habitat throughout much of the eastern Gulf, artificial reefs are important locally, especially in the Florida Panhandle. Accordingly, continued incorporation of artificial reef habitats within large-scale fishery-independent monitoring efforts is critical to the accurate assessment of the status of reef-fish stocks on broad spatial scales.
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"Fish Habitat: Essential Fish Habitat and Rehabilitation." In Fish Habitat: Essential Fish Habitat and Rehabilitation, edited by Kenneth W. Able. American Fisheries Society, 1999. http://dx.doi.org/10.47886/9781888569124.ch11.
Testo completoAbstract (sommario):
<em>Abstract</em> .—Defining and quantifying essential fish habitat is difficult, perhaps particularly so in estuaries, which are typically dynamic. Yet we need habitat data to make informed decisions about the management of estuarine habitats and associated fish populations. Our ongoing efforts to resolve issues of fish habitat quality have been centered in the relatively unaltered Jacques Cousteau National Estuarine Research Reserve (the Reserve) in the Mullica River–Great Bay estuary in southern New Jersey, where extensive studies of fishes and their habitats have been conducted during the last decade. Much of our effort to define essential fish habitat has focused on a variety of shallow-water habitats (eelgrass, macroalgae, marsh creeks, unvegetated substrates of different grain sizes) where it is easier to sample in a quantitative manner (e.g., using throw traps and beam trawls) and conduct experimental manipulations (e.g., caging, deploying of artificial habitats). Although our studies in the Reserve have been extensive, they still have been focused on a relatively small component (less than 3%) of the fish fauna of the Reserve, including several species of economic importance. These species include winter flounder <em>Pseudopleuronectes americanus</em> , summer flounder <em>Paralichthys dentatus</em> , tautog <em>Tautoga onitis</em> , and black sea bass <em>Centropristis striata</em> . This work has examined the period from larval ingress and settlement through the first year using a variety of complementary approaches. To date, these studies have included measures of habitat-specific distribution, abundance, residence time, and growth. Attempts to identify both habitat-specific measures of mortality and sources of mortality have proven especially difficult for the migratory fishes typical of Middle Atlantic Bight estuaries. In fact, this mobility, which occurs at seasonal, diel, tidal, and episodic (storms, upwelling, etc.) scales, makes it difficult to assess residence times and confounds attempts to measure habitat quality. The measures of habitat quality that we have used suggest that there are species-specific and habitat-specific responses; however, data sets for multiple years are seldom available to confirm these responses. Efforts to quantify essential fish habitat will be limited in their effectiveness until interannual variability can be assessed.
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"Fish Habitat: Essential Fish Habitat and Rehabilitation." In Fish Habitat: Essential Fish Habitat and Rehabilitation, edited by Kenneth W. Able. American Fisheries Society, 1999. http://dx.doi.org/10.47886/9781888569124.ch11.
Testo completoAbstract (sommario):
<em>Abstract</em> .—Defining and quantifying essential fish habitat is difficult, perhaps particularly so in estuaries, which are typically dynamic. Yet we need habitat data to make informed decisions about the management of estuarine habitats and associated fish populations. Our ongoing efforts to resolve issues of fish habitat quality have been centered in the relatively unaltered Jacques Cousteau National Estuarine Research Reserve (the Reserve) in the Mullica River–Great Bay estuary in southern New Jersey, where extensive studies of fishes and their habitats have been conducted during the last decade. Much of our effort to define essential fish habitat has focused on a variety of shallow-water habitats (eelgrass, macroalgae, marsh creeks, unvegetated substrates of different grain sizes) where it is easier to sample in a quantitative manner (e.g., using throw traps and beam trawls) and conduct experimental manipulations (e.g., caging, deploying of artificial habitats). Although our studies in the Reserve have been extensive, they still have been focused on a relatively small component (less than 3%) of the fish fauna of the Reserve, including several species of economic importance. These species include winter flounder <em>Pseudopleuronectes americanus</em> , summer flounder <em>Paralichthys dentatus</em> , tautog <em>Tautoga onitis</em> , and black sea bass <em>Centropristis striata</em> . This work has examined the period from larval ingress and settlement through the first year using a variety of complementary approaches. To date, these studies have included measures of habitat-specific distribution, abundance, residence time, and growth. Attempts to identify both habitat-specific measures of mortality and sources of mortality have proven especially difficult for the migratory fishes typical of Middle Atlantic Bight estuaries. In fact, this mobility, which occurs at seasonal, diel, tidal, and episodic (storms, upwelling, etc.) scales, makes it difficult to assess residence times and confounds attempts to measure habitat quality. The measures of habitat quality that we have used suggest that there are species-specific and habitat-specific responses; however, data sets for multiple years are seldom available to confirm these responses. Efforts to quantify essential fish habitat will be limited in their effectiveness until interannual variability can be assessed.
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"Fish Habitat: Essential Fish Habitat and Rehabilitation." In Fish Habitat: Essential Fish Habitat and Rehabilitation, edited by Philip Roni, Laurie A. Weitkamp, and Joe Scordino. American Fisheries Society, 1999. http://dx.doi.org/10.47886/9781888569124.ch9.
Testo completoAbstract (sommario):
<em>Abstract.—</em> Freshwater and marine essential fish habitat (EFH) for chinook <em>Oncorhynchus tshawytscha</em> , coho <em>O. kisutch</em> , pink <em>O. gorbuscha</em> , and sockeye <em>O. nerka </em> salmon within Washington, Oregon, California, and Idaho was described and identified using the available literature and databases on salmon distribution and life history. The diversity of freshwater habitats utilized by individual species of salmon coupled with the limitations of existing distribution maps precluded identification of specific stream reaches, wetlands, and other water bodies as EFH for Pacific salmon. A more holistic watershed approach consistent with the ecosystem method recommended by the revised Magnuson-Stevens Fishery Conservation and Management Act was necessary. Therefore, Pacific salmon freshwater EFH was delineated and described as all existing water bodies currently and historically utilized by Pacific salmon within selected watersheds defined by U.S. Geological Survey hydrologic units. Areas above some long-standing artificial barriers to juvenile and adult salmon migration were excluded from designation as Pacific salmon EFH. Delineation of marine EFH was also problematic because of the paucity of scientific studies on offshore Pacific salmon habitat use and distribution. However, available scientific data augmented by information from commercial fisheries indicate that juvenile salmon are found in high concentrations in the nearshore areas of the continental shelf off the Washington, Oregon, and California coasts from late spring through fall. Therefore, Pacific salmon marine EFH was identified as all waters within 60 km of the Washington, Oregon, and California coasts north of Point Conception, California. This initial effort to identify Pacific salmon EFH emphasized the need for accurate, fine-scale geographic information systems data on freshwater and marine salmon distribution and habitat quality and the need for compilation of uniform data sets. Future efforts should focus on developing accurate seasonal salmon distribution data at a 1:24,000 scale to aid in more precise and accurate delineation of Pacific salmon EFH. Furthermore, detailed information on winter distribution of Pacific salmon would be useful in delineating marine EFH.
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"Fish Habitat: Essential Fish Habitat and Rehabilitation." In Fish Habitat: Essential Fish Habitat and Rehabilitation, edited by Philip Roni, Laurie A. Weitkamp, and Joe Scordino. American Fisheries Society, 1999. http://dx.doi.org/10.47886/9781888569124.ch9.
Testo completoAbstract (sommario):
<em>Abstract.—</em> Freshwater and marine essential fish habitat (EFH) for chinook <em>Oncorhynchus tshawytscha</em> , coho <em>O. kisutch</em> , pink <em>O. gorbuscha</em> , and sockeye <em>O. nerka </em> salmon within Washington, Oregon, California, and Idaho was described and identified using the available literature and databases on salmon distribution and life history. The diversity of freshwater habitats utilized by individual species of salmon coupled with the limitations of existing distribution maps precluded identification of specific stream reaches, wetlands, and other water bodies as EFH for Pacific salmon. A more holistic watershed approach consistent with the ecosystem method recommended by the revised Magnuson-Stevens Fishery Conservation and Management Act was necessary. Therefore, Pacific salmon freshwater EFH was delineated and described as all existing water bodies currently and historically utilized by Pacific salmon within selected watersheds defined by U.S. Geological Survey hydrologic units. Areas above some long-standing artificial barriers to juvenile and adult salmon migration were excluded from designation as Pacific salmon EFH. Delineation of marine EFH was also problematic because of the paucity of scientific studies on offshore Pacific salmon habitat use and distribution. However, available scientific data augmented by information from commercial fisheries indicate that juvenile salmon are found in high concentrations in the nearshore areas of the continental shelf off the Washington, Oregon, and California coasts from late spring through fall. Therefore, Pacific salmon marine EFH was identified as all waters within 60 km of the Washington, Oregon, and California coasts north of Point Conception, California. This initial effort to identify Pacific salmon EFH emphasized the need for accurate, fine-scale geographic information systems data on freshwater and marine salmon distribution and habitat quality and the need for compilation of uniform data sets. Future efforts should focus on developing accurate seasonal salmon distribution data at a 1:24,000 scale to aid in more precise and accurate delineation of Pacific salmon EFH. Furthermore, detailed information on winter distribution of Pacific salmon would be useful in delineating marine EFH.
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Kushlan, James A., and James A. Hancock. "Javan Pond-Heron Ardeola speciosa." In Herons. Oxford University PressOxford, 2005. http://dx.doi.org/10.1093/oso/9780198549819.003.0039.
Testo completoAbstract (sommario):
Abstract rice fields and other artificial habitats. The use of these are now likely critical to population stability. The loss of fish pond habitat led to a decrease of herons in Hong Kong (Young 1998). The management of occupied wetlands, including artificial environments occupied by the birds, is a critical conservation measure for the long-term stability of the populations. Eggs and birds are taken for food in China (Parish and Melville 1985). However, range expansion continues despite these losses. Hunting and other human use need to be evaluated.
Atti di convegni sul tema "Artificial fish habitats"
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Langhamer, Olivia, Dan Wilhelmsson, and Jens Engstro¨m. "Development of Invertebrate Assemblages and Fish on Offshore Wave Power." In ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/omae2009-79239.
Testo completoAbstract (sommario):
A significant development of offshore wave power is planned in the future, and its impact on the marine environment is unclear. Solid structures placed on the seabed create new habitats and function as artificial reefs for marine organisms. In this study we investigated the artificial reef effect and fouling impacts on offshore wave power devices deployed at the Swedish west coast. Here, buoys acting as point absorbers on the surface are connected to generators anchored on concrete foundations on the seabed. We studied the influence of surface orientation of the wave power foundations on epibiotic colonisation, and made in situ observations of micro-habitat use by fish and crustaceans over four years of submergence. We also examined fouling assemblages on buoys and calculated the effects of biofouling on the energy absorption of the wave power buoys.
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Djikanović, Vesna, Jelena Vranković, Katarina Jovičić, Katarina Zorić, Nemanja Pankov, and Branko Miljanović. "FISH COMMUNITY OF BELOCRKVAN LAKES." In 53rd Annual Conference of the Serbian Water Pollution Control Society. SERBIAN WATER POLLUTION CONTROL SOCIETY, 2024. http://dx.doi.org/10.46793/voda24.149dj.
Testo completoAbstract (sommario):
Research of fish communities was carried out in November 2023 in artificial lakes in the area of Bela Crkva. Using a multiparameter probe, the basic physical and chemical parameters of water quality were measured, according to which the waters of these lakes belongs to the class I and II waters. In total, the presence of nine species from six families was registered. Of the total number of registered species, two are listed in the Berne Convention, while one species is listed in the Habitats Directive. According to national legislation, one species is strictly protected, while three species are protected. It can be concluded that the biological diversity of the ichthyofauna of the studied lakes is solid, and that the basic characteristic of the ichthyofauna is a high level of autochthonousness.
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Hii, Y. S., M. H. Mohd, Mohd Izzat Mohd Thiyahuddin, M. A. A. Rahman, and C. H. Tan. "Improving Biological Reefing Viability Index as a Predictive Tool for Assessment of Potential Reefing Site in the Tropical Shallow Offshore Environment." In SPE Symposium: Decommissioning and Abandonment. SPE, 2021. http://dx.doi.org/10.2118/208497-ms.
Testo completoAbstract (sommario):
Abstract The current study improved the predictive capability of the biological reefing viability index (BRVI) calibrated using local data. The prediction capability of the BRVI improved from 61% to 76% accuracy out of the 181 locations where the underwater videos available for verification. The BRVI includes corals larvae density, age of larvae at site, sea current, sea temperature, chlorophyll-a, water depth and sediment type to predict biological productivity of an area. Among the parameters, corals larvae density and age of the larvae are the most critical parameters that influent establishment of new biological ecosystem. The BRVI uses settlement of corals larvae as the precursors for the establishment of new habitats in the offshore environment because scleractinian corals is known to be able to form backbone of a new habitat in the environment. In this approach, the BRVI focuses on habitat creation instead of just being a fish aggregating device (FAD) when an artificial reef is deployed in an area. The BRVI can be used as a rapid screening tool to identified potential area for deployment of artificial reefs. The BRVI could reduce the chances of artificial reefs deployment that failed to address its objectives and intended outcomes.
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Sneitzer, B. "Artificial Fish Habitat." In OCEANS '86. IEEE, 1986. http://dx.doi.org/10.1109/oceans.1986.1160490.
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A.V., Shokurova, Anishchenko O. V., Kashinskaya E.N., and Solovyev M.M. "THE ELEMENTAL COMPOSITION OF BILE OF SOME MARINE AND FRESHWATER FISH SPECIES AND ITS POSSIBLE PRACTICAL APPLICATION IN AQUACULTURE." In II INTERNATIONAL SCIENTIFIC AND PRACTICAL CONFERENCE "DEVELOPMENT AND MODERN PROBLEMS OF AQUACULTURE" ("AQUACULTURE 2022" CONFERENCE). DSTU-Print, 2022. http://dx.doi.org/10.23947/aquaculture.2022.29-31.
Testo completoAbstract (sommario):
The elemental composition of the bile of 429 fish individuals of 21 species of freshwater and marine fish has studied. Macroelements (Ca, K, Mg, Na, P, S), regardless of the diets and habitat of fish, were in the highest concentrations if compare to other elements. However, it is possible to note some differences in the concentrations of such macronutrients as K and Na between marine and freshwater species. Cu, Li and Sr were found in the bile of all studied freshwater species, while bile form marine species has always contained elements such as As, Cu, Li, Se and Sr. At the same time, Bi, Cd, Mo and Tl were absent in most species of both freshwater and marine fishes. Statistical analysis has revealed that such factors as “feeding habits”, “habit”, “season” and “year" had a significant effect on the elemental composition of fish bile. The obtained data of the elemental composition of bile are applicable to the creation of selective artificial nutrient media and species-specific feeds.
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Tang, Yanli, Qi Hu, Xinxin Wang, Fenfang Zhao, Liuyi Huang, and Tao Xie. "Evaluation of Flow Field in the Layouts of Cross-Shaped Artificial Reefs." In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-95192.
Testo completoAbstract (sommario):
Abstract Artificial reefs (ARs) are purposely submerged in natural aquatic environments to provide additional habitat for fish. The reasonable layout of ARs on the sea floor can effectively enhance and support important marine species. This research involves a three-dimensional numerical simulation to analyze the flow effect of three types of AR layouts based on computational fluid dynamics. Through numerical simulation of the flow past the reefs, we can determine the scale of the upwelling and back-eddy flow. Based on the simulation data, the rational transverse distance between two cross-shaped artificial reefs (CSARs) is 6L (L is the length of the single reef), which is used to design the layouts of CSARs. Five indicators have been used to evaluate the flow field effect of these three layouts. According to the comparison of five indications for different layouts of CSAR, it is more reasonable to divide the AR layouts into two categories: upwelling layout and back eddy layout. Finally, the sphere of influence of the AR layouts on the fisheries resource is also discussed.
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Jurminskaia, Olga, Igor Shubernetskii, and Nadejda Andreev. "Effect of lactobacilli on autochthonous microflora of fish ponds." In 5th International Scientific Conference on Microbial Biotechnology. Institute of Microbiology and Biotechnology, 2022. http://dx.doi.org/10.52757/imb22.47.
Testo completoAbstract (sommario):
The abundance of bacterioplankton and bacteriobenthos in fish ponds is largely determined by three main factors: water temperature, fish stocking density and fertilizers used. As the water temperature rises, the intensity of the metabolic processes of the microbiota increases, and their number increases significantly. The greatest number of microorganisms is contained in the surface layer of bottom sediments. Intensive consumption of the oxygen by bacterioplankton and bacteriobenthos can lead to fish kills. The use of probiotics in aquaculture is of great interest: their influence on the immunostimulation of farmed fish, direct inhibition of pathogenic bacteria and improvement of pond water quality have been studied by many researchers. In order to determine measures to improve water quality in fish ponds, the laboratory experiment with the probiotic Lactobacillus acidophilus was carried out in the conditions of the Laboratory of Hydrobiology and Ecotoxicology. In this experiment, water samples were collected from the fish ponds of the "Ghidrin-Falesti Fish Enterprise" in RM. The degree of water body organic pollution is characterised by the hydrochemical parameter BOD5, which varied from 8 to 28 (mg/L O2) in water samples of these fish ponds. In accordance with the "Regulations" in force in the Republic of Moldova (2013), BOD5 values > 7 (mg/L O2) correspond to water quality class V. Thus, in terms of the amount of organic substrate, the water in these ponds is a good habitat for heterotrophic microorganisms. As a result of the development of the scientific basis of the theory of fertilisation of fishponds by Soviet hydrobiologists (N. Arnold, G. Vinberg, V. Zhadin, A. Rodina, etc.) the following was revealed: when fish is raised in high stocking with artificial compound feed, the task arises to limit bacterial development, i.e. to manage bacterial processes in the fish ponds. The task remains relevant today. The aim of the experiment was to test the ability of lactobacilli to survive in the bottom layer of a fish pond in comparison with autochthonous microflora. For this purpose, water samples from the Calugar, Girla and Fagadau ponds were divided into two aliquots: matrix (natural sample) and matrix + lactobacilli. Lactobacilli are non-pathogenic Gram-positive microorganisms with high enzymatic activity. In relation to oxygen, they are microaerophiles. By type of nutrition, they are chemoheterotrophs, using organic compounds as a source of energy and carbon. All aliquots were incubated at 22°C without aeration and also without access to light to minimise the photosynthetic activity of phytoplankton. After five days, each aliquot was inoculated (at the appropriate dilution) into Petri dishes on Tergitol 7 agar (without TTC) and incubated at 22°C. In sanitary microbiology, MRS agar is used for testing lactobacilli and cultivation is carried out at (30 - 35) °C. In our experiment, the aim was not to create the specific conditions for lactobacilli. We used Tergitol 7 agar, which contains lactose as opposed to MRS agar, which contains dextrose. To find out the ability to grow on Tergitol 7 agar and to determine the specific characteristics of the colonies, a Lactobacillus acidophilus culture was inoculated on this medium and cultivated under the same conditions as the test samples. The results of the experiment are presented below: Fagadau Girla Calugar Matrix on the day of sampling, 103 CFU/mL 3,3 3,2 2,5 Matrix after 5 days, 103 CFU/mL 30 10 5 Matrix + L. acidophilus after 5 days, 103 CFU/mL 4725 1805 2625 Thus, under oxygen-deficient conditions, the autochthonous microflora of fish ponds cannot withstand competition with lactobacilli, which are microaerophiles. If the results of the laboratory experiment are confirmed in real conditions, lactobacilli may be recommended for the suppression of autochthonous microflora, which are intensive oxygen consumers in summer biocenoses.
Rapporti di organizzazioni sul tema "Artificial fish habitats"
1
Sprague, Joshua, David Kushner, James Grunden, Jamie McClain, Benjamin Grime, and Cullen Molitor. Channel Islands National Park Kelp Forest Monitoring Program: Annual report 2014. National Park Service, 2022. http://dx.doi.org/10.36967/2293855.
Testo completoAbstract (sommario):
Channel Islands National Park (CHIS) has conducted long-term ecological monitoring of the kelp forests around San Miguel, Santa Rosa, Santa Cruz, Anacapa and Santa Barbara Islands since 1982. The original permanent transects were established at 16 sites between 1981 and 1986 with the first sampling beginning in 1982, this being the 33rd year of monitoring. An additional site, Miracle Mile, was established at San Miguel Island in 2001 by a commercial fisherman with assistance from the park. Miracle Mile was partially monitored from 2002 to 2004, and then fully monitored (using all KFM protocols) since 2005. In 2005, 16 additional permanent sites were established to collect baseline data from inside and adjacent to four marine reserves that were established in 2003. Sampling results from all 33 sites mentioned above are included in this report. Funding for the Kelp Forest Monitoring Program (KFM) in 2014 was provided by the National Park Service (NPS). The 2014 monitoring efforts utilized 49 days of vessel time to conduct 1,040 dives for a total of 1,059 hours of bottom time. Population dynamics of a select list of 71 “indicator species” (consisting of taxa or categories of algae, fish, and invertebrates) were measured at the 33 permanent sites. In addition, population dynamics were measured for all additional species of fish observed at the sites during the roving diver fish count. Survey techniques follow the CHIS Kelp Forest Monitoring Protocol Handbook (Davis et al. 1997) and an update to the sampling protocol handbook currently being developed (Kushner and Sprague, in progress). The techniques utilize SCUBA and surface-supplied-air to conduct the following monitoring protocols: 1 m2 quadrats, 5 m2 quadrats, band transects, random point contacts, fish transects, roving diver fish counts, video transects, size frequency measurements, and artificial recruitment modules. Hourly temperature data were collected using remote temperature loggers at 32 sites, the exception being Miracle Mile where there is no temperature logger installed. This annual report contains a brief description of each site including any notable observations or anomalies, a summary of methods used, and monitoring results for 2014. All the data collected during 2014 can be found in the appendices and in an Excel workbook on the NPS Integrated Resource Management Applications (IRMA) portal. In the 2013 annual report (Sprague et al. 2020) several changes were made to the appendices. Previously, annual report density and percent cover data tables only included the current year’s data. Now, density and percent cover data are presented in graphical format and include all years of available monitoring data. Roving diver fish count (RDFC), fish size frequency, natural habitat size frequency, and Artificial Recruitment Module (ARM) size frequency data are now stored on IRMA at https://irma.nps.gov/DataStore/Reference/Profile/2259651. The temperature data graphs in Appendix L include the same graphs that were used in past reports, but include additional violin plot sections that compare monthly means from the current year to past years. In addition to the changes listed above, the layout of the discussion section was reordered by species instead of by site. The status of kelp forests differed among the five park islands. This is a result of a combination of factors including but not limited to, oceanography, biogeography and associated differences in species abundance and composition, as well as sport and commercial fishing pressure. All 33 permanent sites were established in areas that had or were historically known to have had kelp forests in the past. In 2014, 15 of the 33 sites monitored were characterized as developing kelp forest, kelp forest or mature kelp forest. In addition, three sites were in a state of transition. Two sites were part kelp forest and part dominated by Strongylocentrotus purpuratus...
2
Mekong Giant Fish Species: On Their Management and Biology. Mekong River Commission Secretariat, 2005. http://dx.doi.org/10.52107/mrc.ajni14.
Testo completoAbstract (sommario):
The report presents a summary review biology and ecology of these species and provides data on their habitats, migration, reproductive biology and life cycles and the results of experiments on artificial breeding.
3
Mekong Giant Fish Species: On Their Management and Biology. Mekong River Commission Secretariat, 2002. http://dx.doi.org/10.52107/mrc.akbon5.
Testo completoAbstract (sommario):
The report presents a summary review biology and ecology of these species and provides data on their habitats, migration, reproductive biology and life cycles and the results of experiments on artificial breeding.
4
ຊະນິດປາໃຫຍ່ໃນແມ່ນໍ້າຂອງ: ການຄຸ້ມຄອງ ແລະ ຊີວະວິທະຍາ. Mekong River Commission Secretariat, 2005. http://dx.doi.org/10.52107/mrc.ajmaut.
Testo completoAbstract (sommario):
This is the Laotian version the report on Mekong Giant Fish Species: On Their Management and Biology. It presents a summary review biology and ecology of these species and provides data on their habitats, migration, reproductive biology and life cycles and the results of experiments on artificial breeding.