Relevant bibliographies by topics / Demersal fish

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  4. Book chapters
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Academic literature on the topic 'Demersal fish'

Author: Grafiati
Published: 4 June 2021
Last updated: 12 February 2022

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Journal articles on the topic "Demersal fish"

1

Penton, P. M., G. K. Davoren, W. A. Montevecchi, and D. W. Andrews. "Beach and demersal spawning in capelin (Mallotus villosus) on the northeast Newfoundland coast: egg developmental rates and mortality." Canadian Journal of Zoology 90, no. 2 (February 2012): 248–56. http://dx.doi.org/10.1139/z11-132.

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Timing of spawning and site selection in fish are important fitness-related traits that ultimately influence reproductive success. Capelin ( Mallotus villosus (Müller, 1776)), a key forage fish in the north Atlantic, spawn eggs that adhere to sediments on beaches and in demersal (deep-water) habitats throughout their geographic range, resulting in divergent thermal regimes for the incubating eggs. We compare the timing and duration of spawning of capelin and its influence on the developmental and survival rates of eggs between a beach and a demersal spawning site on the northeast Newfoundland coast in 2004 and 2005. Spawning events at the beach were at least 10 days earlier and shorter (2–3 days) relative to the demersal site (8–12 days). Hourly and mean daily incubation temperatures at the beach were higher and more variable relative to the demersal site, resulting in two distinct developmental strategies: low to high mortality and rapid development (beach) versus low mortality and slow development (demersal). Higher egg mortality at beach sites was explained by higher and more variable temperatures and potentially limited oxygen replenishment relative to demersal sites. The divergent biology of beach and demersally spawned eggs suggest that each will respond differently to environmental change and, thus, require different approaches for successful management.
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2

Angin, Robet Perangin, NFN Sulistiono, Rahmat Kurnia, Achmad Fahrudin, and Ali Suman. "Struktur komunitas sumber daya ikan demersal berdasarkan kedalaman perairan di Laut Cina Selatan (WPP-NRI 711) [Community structure of demersal fish resources based on the depth of the waters in the South China Sea (Indonesia Fisheries Management Zone 711)]." Jurnal Iktiologi Indonesia 17, no. 1 (August 22, 2017): 67. http://dx.doi.org/10.32491/jii.v17i1.305.

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Information on distribution and community structure of demersal fish resources are important to be known as an input to the management of demersal fisheries. This study aimed to analyze the diversity and distribution of demersal fish resources based on the differences in the depth of the waters and the linkages to the environment. Research conducted in the South China Sea in May to June 2015 by operating a trawl gear in the station preset. The method of analysis of demersal fish diversity use some ecological indices i.e Margalef species richness index, Shannon-Wiener diversity index, Pielou evenness index, and Simpson dominance index. The ecological index value then associated with environmental conditions, using principal component analysis. Distribution of the ecological index indicated the stability of communities demersal fish resources getting better with the increase of depth. The most affected to the level of species richness and distribution of demersal fish were the parameters of depth, temperature and salinity, while the abundance distribution of fishes were associated with dissolved oxygen, and water transparency. The implication, that the water environmental conditions greatly affected the distribution and abundance of demersal fish. AbstrakInformasi mengenai persebaran dan struktur komunitas sumber daya ikan demersal penting sebagai bahan masukan untuk pengelolaan perikanan demersal. Penelitian ini bertujuan untuk menganalisis tingkat keanekaragaman dan persebaran sumber daya ikan demersal berdasarkan perbedaan kedalaman perairan, serta keterkaitannya dengan lingkungan. Penelitian dilaksanakan di Laut Cina Selatan pada bulan Mei sampai Juni 2015 dengan mengoperasikan alat tangkap pukat ikan di stasiun yang telah ditetapkan. Metode analisis keanekaragaman hayati ikan demersal menggunakan beberapa indeks ekologi yaitu indeks kekayaan jenis Margalef, indeks keanekaragaman Shannon-Wiener, indeks keseragaman Pielou, dan indeks dominansi Simpson. Nilai indeks ekologi tersebut kemudian dikaitkan dengan kondisi lingkungan, menggunakan analisis komponen utama. Hasil penelitian menunjukkan tingkat kestabilan komunitas sumber daya ikan demersal semakin baik seiring dengan meningkatnya kedalaman. Kedalaman, suhu, dan salinitas merupakan parameter yang paling memengaruhi tingkat kekayaan jenis serta persebaran sumber daya ikan demersal, sedangkan persebaran kelimpahan ikan sangat terkait dengan oksigen terlarut dan kecerahan perairan. Implikasinya, kondisi lingkungan perairan sangat memengaruhi persebaran dan kelimpahan ikan demersal.
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3

Purwanto, Purwanto. "POTENTIAL PRODUCTION OF DEMERSAL FISH STOCK IN THE MALACCA STRAIT OF INDONESIA." Indonesian Fisheries Research Journal 21, no. 1 (June 1, 2015): 45. http://dx.doi.org/10.15578/ifrj.21.1.2015.45-52.

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Malacca Strait is one of the main fishing areas for demersal fishery in Indonesia. To support the management of that fishery, an assessment of the demersal fish stock was conducted. This study estimated that the maximum sustainable yield and the optimal catch per unit effortof demersal fishery in the Malacca Strait were about 106.8 thousand tons/year and 28.5 tons per unit of Danish seine, respectively, resulting from the operation of 3,752 Danish seines. Unfortunately, fishing effort was higher than its optimum level and the fish stock was over-exploited since 2003. To recover the demersal fish stock to its optimum level and to ensure the optimal fish production from demersal fishery in the Malacca Strait, it was necessary to reduce fishing effort at about 67% from its level in 2011.
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4

Rocha, Adélia R. M., Ana Paula M. Di Beneditto, Inácio A. Pestana, and Cristina Maria M. de Souza. "Isotopic profile and mercury concentration in fish of the lower portion of the rio Paraíba do Sul watershed, southeastern Brazil." Neotropical Ichthyology 13, no. 4 (December 2015): 723–32. http://dx.doi.org/10.1590/1982-0224-20150047.

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ABSTRACT The aim of this study was to evaluate the isotopic profile and mercury (Hg) concentrations in fish (carnivores, omnivores and detritivores) in the lower portion of the rio Paraíba do Sul watershed, southeastern Brazil. Carbon (δ13C) isotopic analyses revealed that pelagic and benthonic sources are part of the feeding of the fish from the different guilds (-14.0 to -24.8 ‰). The benthic sources are usually enriched in δ13C (-16.9‰, from watershed runoff) compared to pelagic sources because the phytoplankton, important primary producer that supports several pelagic chains, has δ13C signature lighter (-23.9‰). The nitrogen (δ15N) isotopic signatures indicated that most guilds were at the same trophic position (10.0 to 15.5 ‰), except for pelagic omnivorous fish, which had a lower trophic position. Niche overlap was observed among pelagic and demersal carnivorous fish, demersal omnivorous fish, and demersal detritivorous fish. The lower isotopic niche breadth of pelagic carnivorous fish reveals the specialized resource use by this guild. Hg concentrations (ng g-1 dry weight) differed significantly between demersal carnivorous fish (185.3 dry weight; 27.8 wet weight) and demersal omnivorous fish (277.9 dry weight; 41.7 wet weight) and between pelagic omnivorous fish (197.2 dry weight; 29.6 wet weight) and demersal omnivorous fish due to (1) differences in food sources: guilds that fed on bottom resources were more affected by contamination because the sediment is an important Hg accumulator in the study area, and (2) because of its trophic positions. Considering that the fish consumed prey of similar trophic positions, the guilds did not show a well-defined food hierarchy. Therefore, in this study, there was no clear relationship between Hg and δ15N.
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5

Shuntov, V. P., and O. S. Temnykh. "LONG-TERM AVERAGE BIOMASS AND DOMINANT FISH SPECIES IN THE BOTTOM BIOTOPES OF THE OKHOTSK SEA. PART 1. COMPOSITION AND QUANTITATIVE RATIO OF SPECIES ON SHELVES IN DIFFERENT AREAS OF THE SEA." Izvestiya TINRO 193 (July 9, 2018): 3–19. http://dx.doi.org/10.26428/1606-9919-2018-193-3-19.

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Composition of the demersal fish community in the bottom biotopes of 14 biostatistical areas of the Okhotsk Sea is considered on the data of 9,189 standard trawl catches obtained in 95 expeditions conducted by Pacific Fish. Res. Center (TINRO) in 1977–2010. The most abundant fish species in each area are ranked by biomass. The total demersal fish biomass is estimated as 9583.0 . 103 t (2124.9 . 103 t without pollock and herring). The most numerous demersal species are: pacific cod Gadus macrocephalus, yellowfin sole Limanda aspera, pacific sand lance Ammodytes hexapterus, great sculpin Mycocephalus polyacanthocephalus, and saffron cod Eleginus gracilis.
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Cohen, Daniel M., Nigel R. Merrett, and Richard L. Haedrich. "Deep-Sea Demersal Fish and Fisheries." Copeia 1999, no. 3 (August 2, 1999): 843. http://dx.doi.org/10.2307/1447628.

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7

Rouleau, C., C. Gobeil, and H. Tjälve. "Cadmium accumulation in coastal demersal fish." Marine Ecology Progress Series 311 (April 13, 2006): 131–43. http://dx.doi.org/10.3354/meps311131.

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H.-J., Wagner, and Mattheus U. "Pineal organs in deep demersal fish." Cell and Tissue Research 307, no. 1 (January 1, 2002): 115–27. http://dx.doi.org/10.1007/s00441-001-0482-y.

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Johnson, Andrew F., Maria Valls, Joan Moranta, Stuart R. Jenkins, Jan G. Hiddink, and Hilmar Hinz. "Effect of prey abundance and size on the distribution of demersal fishes." Canadian Journal of Fisheries and Aquatic Sciences 69, no. 1 (January 2012): 191–200. http://dx.doi.org/10.1139/f2011-138.

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Many demersal fish species rely on benthic prey as food sources for part of, or in some cases, all of their life history. We investigated the relationships between prey and predator abundance and prey size and predator mouth gape size for nine demersal fish species. Of the species analysed, four showed a significant positive increase in abundance with increasing prey abundance. Prey size is thought to be an important parameter for demersal fish that are limited in their feeding potential by their mouth gape size, as it influences consumption rate and energy expenditure while foraging. The relationship between prey size and mouth gape was investigated using both stomach content data and prey availability data. Stomach content analysis revealed positive relationships between maximum prey size and predator mouth gape size for six of the species. Indications of prey size selectivity were only seen in the environment for European hake ( Merluccius merluccius ), highlighting the potential importance of prey size over prey abundance for this species. The results demonstrate that prey abundance and size are of significance for some demersal fish species feeding primarily on benthos and will help in defining habitat requirements of demersal fish species.
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10

Suprapto, Suprapto. "INDEKS KEANEKARAGAMAN JENIS IKAN DEMERSAL DI PERAIRAN TARAKAN." BAWAL Widya Riset Perikanan Tangkap 6, no. 1 (December 31, 2015): 47. http://dx.doi.org/10.15578/bawal.6.1.2014.47-53.

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Perairan Tarakan termasuk daerah penangkapan sumber daya ikan demersal dan udang cukup potensial di KalimantanUtara. Tingginya tingkat eksploitasi ikan demersal dengan menggunakan trawlmenyebabkan keragaman jenisnya rendah. Penelitian ikan demersal dilakukan di perairan Tarakan pada bulanMei,Agustus dan Nopember 2012. Tujuan penelitian adalah untuk memperoleh indeks keanekaragaman jenis ikan demersal. Data spesies ikan demersal dikumpulkan dari hasil tangkapan jaring trawl yang dioperasikan oleh kapal motor 20GT dengan metode sapuan area. Hasil penelitian menunjukkan bahwa jumlah taksa ikan demersal sebanyak 86 spesies yang tergolong kedalam45 famili. Komposisi jenis hasil tangkapan trawl didominasi oleh famili Leiognathidae (ikan petek), Sciaenidae (ikan gulama), Harpadontidae (ikan nomei),Apogonidae (ikan serinding) danMullidae (ikan bijinangka). Status keanekaragaman jenis termasuk dalamkategori sedang dengan indeks “Shanon-Wiener” (H’)berkisar antara 1,7-2,5 sedangkan indeks kekayaan “Margalef” (R1 ) berkisar antara 7-8. Penyebaran spesies ikan demersal bersifat sedang dengan indeks kemerataan jenis (E) rata-rata sebesra 0,5.Kelimpahan ikan demersal tidak ada yang dominan, ditunjukkan oleh nilai indeks kemerataan jenis “Pielou” (E) rata-rata sebesar 0,4.Tarakan and adjacent waters is one of potentially fishing ground of demersal fish resources in north Kalimantan. High exploitation by trawler tend to decreased of biodiversity of demersal fish in this area. Research has been conducted in the waters of Tarakan duringMay, August and November 2012. The aim of this research is to get species diversity indices of demersal fish, which is expected to be useful as one of the data capacity for sustainable fisheries management policy. Data obtained by using trawl fishing gear with a sweept area method.The results showed that demersal fish species richness 86 species, belonging to 45 families. Dominant family are Leiognathidae, Sciaenidae, Harpadontidae, Apogonidae andMullidae. Result of analysis indicate that species diversity in Tarakan waters in the medium category. Status of biodiversity consist of: range value diversityindices “Shanon-Wiener” (H’) was 1.7 to 2.5; species richness indices of “Margalef” (R1 ) are between 7-8; evenness indices of “Pielou” (E 1) was 0,5 and dominant indices “Pielou” (E) an average of 0.4.
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Dissertations / Theses on the topic "Demersal fish"

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Stratoudakis, Yorgos. "A study of fish discarded by Scottish demersal fishing vessels." Thesis, University of Aberdeen, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339907.

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This study focuses on fish discards generated by demersal vessels fishing in Scottish waters (North Sea and West of Scotland). The analysis is based on data collected by scientific observers onboard commercial vessels during the past two decades (1975 - 1993). Chapter 1 introduces the problem of discarding, describes its implications for fisheries and the marine environment, and gives a brief overview of the sampling scheme. Chapter 2 uses generalised additive models (GAMs) and regression trees to investigate the main reasons that lead Scottish fishers to discard commercially important species (haddock - Melanogrammus aeglefinus, whiting - Merlangius merlangus and cod - Gadus morhua). Different discarding patterns are observed in inshore and offshore areas, with vessels fishing offshore discarding larger fish, irrespective of gear type. In inshore areas, discarding decisions are mainly driven by legal landing size, whereas offshore, high grading decisions due to market pressures and, possibly, quota limitations prevail. Chapter 3 explores the performance of several estimators of total discards and their variances in a simulated population of fishing trips. The simulated population is generated from the residuals of temporal models fitted to the catch and discards observations from the trips sampled under the Scottish discards monitoring scheme. The estimator currently applied to obtain annual estimates of total discards in Scotland is shown to be biased and imprecise, whereas several other estimators perform better under limited sampling coverage. The best estimators from chapter 3 are used in chapter 4 to estimate the total discards and their variances for species that were regularly discarded by Scottish vessels in the period 1988 - 1993. Overall, it is estimated that Scottish vessels generate annually around 100,000 tonnes of demersal fish discards in the North Sea and 30,000 tonnes in the West of Scotland. This suggests that close to 40% of the total demersal catch of Scottish vessels is annually wasted through discarding.
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Ok, Meltem. "Evaluation Of The Demersal Fish Assemblages Of The Northeastern Levant Sea." Phd thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12615068/index.pdf.

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Ecosystem-level changes have taken place in the Mediterranean Sea over the last decades due to both anthropogenic interferences and natural perturbations. Compared to the western Mediterranean Sea, influences of these factors especially on flora and fauna characteristics are much more dramatic and intense in the eastern part, particularly in the northeastern Levant Sea where the study area is located. In this study, life history traits of some core species (both native and immigrant) occupying the continental shelf of the northeastern Levant Sea were studied in this changing ecosystem to improve limited ecological understanding of the demersal fish assemblages of the northeastern Levant Sea. For this purpose, the annual patterns in allocation and utilization of energy in demersal fish species, temporal and bathymetrical trends in fish distribution with respect to biological requirements of the species and strategies adapted by the species in growth, reproduction and energy storage were investigated by examining growth parameters, biological indices and abundance and biomass variations. Influences of environmental variables on spatiotemporal distribution and biological characteristic of Mullus barbatus were also explored by generalized additive models. Biological data were collected at monthly intervals between May 2007 and May 2010 by trawl sampling while sample collection of environmental variables (temperature and salinity) was performed from December 2008 to May 2010. Results of this study reveal that the components of the demersal fish assemblage in the region fulfill their biological activities within a short period of time when the highest productivity is reached in the area. Moreover, results indicate that within this short period of time, some native components of the demersal fish assemblages studied (Mullus barbatus and Pagellus erythrinus) exhibit strategies such as fast growth, early maturation, short reproduction season, secondary spawners to cope with the environmental peculiarities. On the other hand, the successful exotic colonizers develop strategies as well but these successful immigrants also use time (Lagocephalus suezensis) and space (depth) (Upeneus pori) slot that the native species avoid. In some of the species examined (Mullus barbatus and Lagocephalus suezensis), growth is fast, sexual maturity is early, reproduction period is short, and reproduction potential is high. With the peculiar environmental condition, these life history traits are attributed to the &ldquo
r-strategy&rdquo
of the species. In this study, generalized additive models of Mullus barbatus explain 81.5 % variations in Gonadosomatic Index (GSI), 55.2 % in Hepatosomatic Index (HSI) and 43.9 % in Condition Factor (K). The time component in the GAM model captures the same cyclic pattern observed in GSI of Mullus barbatus. Besides, The GAM results suggest that the highest GSI values associated with the bottom water temperature are between 18 &ndash
19 °
C while the partial effect of bottom salinity is at 38.7 psu. A positive effect of depth on GSI of the species starts after 60 meters depth and increasing trend continues until 125 meters depth and then decreases. The HSI results are almost identical to GSI outputs indicating that the effects of the parameters concerned act in a similar manner. The results of the GAM models failed to explain influence of environmental parameters on vertical and seasonal distribution of adult Mullus barbatus. However 83.5 % variances were explained in distribution of juveniles. The salinity and temperature have the highest impact on the distribution of juveniles among the parameters evaluated. The results indicate that the occurrence of Atlantic Water in the area has a positive influence on M. barbatus, particularly on the recruits through either by its low salinity or by another factor associated with this water mass. The vertical distribution range are set by the high temperatures (>
27 °
C) at the shallow depths during summer and the low temperatures on the shelf break zone (<
16 °
C). A comparison of vertical abundance distribution of Mullus barbatus and the vertical temperature variations indicate that the species may tolerate up to 27 °
C and then individuals move to the deeper depths so that to the cooler waters when the temperature exceeds their tolerance limit. As well as the life history traits adopted by the species, there are some other factors providing advantages to the species. The fisheries regulations, particularly the time limits applied in the area are in favor of the species especially of pre-recruits. In the study area the pre-recruitment phase and summer YOY aggregations in shallow waters of most species studied in this thesis take place during a time when the fishing season is closed.
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O'Sullivan, Martha. "Population structure of demersal fish species in the north eastern Atlantic." Thesis, Available from the University of Aberdeen Library and Historic Collections Digital Resources. Restricted: no access until Dec. 31, 2010. Online version available for University members only until June 2, 2011, 2009. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=26063.

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Coutin, Patrick C. "The effects of long term exploitation on tropical demersal fish stocks." Thesis, Coventry University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329574.

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Newton, Paul William. "The trophic ecology of offshore demersal teleosts in the North Irish Sea." Thesis, University of Liverpool, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.250301.

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Kuta, Kevin G. "The Effect of Demersal Reef Fish on Two Species of Gorgonian Coral." NSUWorks, 1992. http://nsuworks.nova.edu/occ_stuetd/356.

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The effect of demersal reef fish on the gorgonians Pterogorgia anceps and Plexaurella grisea was determined under controlled conditions. Demersal reef fish cause significant changes in Pterogorgia anceps zooxanthellae concentration (cells cm-3), bulk density (g cm-3), and spicule concentration (g cm-3). Growth rates as measured by changes in planar area (cm2) are not significantly affected. No significant differences were found among any of the parameters measured for Plexaurella grisea; however, trends in the data were similar to those of P. anceps.
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Isidro, Eduardo Jose Louca Florencio. "Biology and population dynamics of selected demersal fish species of the Azores Archipelago." Thesis, University of Liverpool, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307638.

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Buchheister, Andre. "Structure, Drivers, and Trophic Interactions of the Demersal Fish Community in Chesapeake Bay." W&M ScholarWorks, 2014. https://scholarworks.wm.edu/etd/1539616586.

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Management of fisheries resources is increasingly broadening its scope from single-species approaches to more holistic, ecosystem-based approaches that account for interactions of fish with a variety of ecological factors, such as predators, prey, and habitat. This ecosystem based fisheries management (EBFM) approach requires thorough biological and ecological understanding of systems pertaining to community structure, habitat suitability, and food web interactions. to strengthen the ecological underpinnings of EBFM efforts in Chesapeake Bay, the largest estuary in the USA, I conducted synoptic analyses examining the structure, function, and patterns of the bay's demersal fish community. This research relied on I0 years of data from a multi-species, bimonthly bottom trawl survey of the Chesapeake Bay mainstem. The unifying objectives of this work were to 1) synthesize basic biological and ecological information of many Chesapeake Bay fishes, and 2) examine the environmental drivers of community structure and trophic interactions in the Bay. One major hypothesis underlying the more detailed research objectives for each component was that bay-wide patterns in biomass and feeding habits of Chesapeake Bay fishes were mostly driven through bottom-up processes governed by a blend of small- and large-scale environmental factors. as food web structure and trophic interactions are governed by the presence, distribution, abundance, and behavior of species, Chapter 1 focused on evaluating patterns for these basic biological characteristics for a large suite of 50 species and investigating environmental factors that influence the community trends. Univariate and multivariate statistical modeling revealed that the demersal fish community (dominated by five species) was strongly structured along a salinity gradient, and other factors (e.g. dissolved oxygen, temperature, month, and year) helped regulate biomass and diversity trends. Chapter 2 synthesized diet information for 47 fish species, demonstrated the role of five prey groups (mysids, fishes, bivalves, polychaete worms, and crustaceans) in differentiating feeding guilds, and highlighted the importance of non-pelagic prey groups (especially the hyper-benthic mysids) in supporting the nutritional needs of fishes. Diets of 12 predator species were investigated in more detail in Chapter 3 to infer the dynamics of four important prey groups (mysids, bay anchovy, polychaetes, and bivalves) using advanced statistical modeling techniques. Results revealed generally coherent consumption trends across predators for a given prey, suggestive of prey availability driving consumptive patterns. Synchronous annual peaks in prey consumption were indicative of pulses in prey production (particularly mysids and bivalves) that were exploited by predator populations. to evaluate the population-scale effects of these bottom-up alterations in prey productivity, Chapter 4 relied on a simulation model to examine the potential effects that these annual changes in prey availability could have on consumption and production of one representative predator species. The model indicated that enhanced individual growth resulting from pulses in prey production could generate substantial gains in predator spawning stock biomass, recruitment, and fishery yield. However, the bottom-up effects on predator production had only modest effects on rebuilding times of a depleted population relative to controls on fishing mortality. This research represents one of the largest studies on community structure and trophic interactions for demersal fishes in an estuarine environment, contributing to a broader understanding of fish ecology within a complex and dynamic system. By filling research gaps identified for EBFM in Chesapeake Bay, this body of work also supports a more holistic management approach for the sustainable use of resources from the Chesapeake Bay and coastal waters of the Northwest Atlantic Ocean.
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Greig, Antonio Bernardo. "The potential application of acoustic methods in North Sea demersal fish stock surveys." Thesis, University of Aberdeen, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485677.

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In the North Sea, groundfish stock assessment relies on independent bottom trawl surveys to tune the annual indices that are estimated from commercial landings. These surveys have been carried out by several European fishery institutions since the mid 19605 under standardized protocols which have allowed a long time series to be built for the main commercial stocks. An echo-integration survey is an independent metliod with a high ' sampling rate that can be carried out underway. Although it is successfully used on some stocks in the Barents Sea and off the North American Pacific coast, this method is not commonly used for demersal fish quantification. This study investigates the use of echointegration data, gathered during regular bottom trawl surveys in the North Sea~ in providing tuning indices for commercial stocks. To do this, density values extracted from bottom following layers in the acoustic dat{and partitioned by the corresponding catch proportions were compared to the density values obtained from the bottom trawl catches. Univariate and multivariate linear models including depth, position and time of day were fitted and showed very low correlation for demersal species, while resulting in reasonable to good correlation for aggregating pelagic species. As the acoustic method has a dead zone next to the seabed, an analysis of the dead zone dimensions in the study area as well as its mitigation was performed and a software routine was developed to optimize the data USge close to the seabed. A different approach, which allocated acoustic backscatter to targets according to visual interpretation of the echograms and scrutiny protocols, was performed on the optimized data and the density values compared to those of the catches. Correlation results did. not show significant improvement; however the scrutiny process revealed that demersal species were not evident on the echograms, irrespective ofthe catch in the bottom trawl. It is concluded that this discrepancy is due to the aggregation patterns in groundfish, and not necessarily the dead zone alone. Quantification of pelagic species can benefit from the use of echo-integration during bottom trawl surveys, however modifications to the survey design to allow targeted trawls and a systematic survey track are suggested to improve future studies.
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Moore, Cordelia Holly. "Defining and predicting species-environment relationships : understanding the spatial ecology of demersal fish communities." University of Western Australia. Faculty of Natural and Agricultural Sciences, 2009. http://theses.library.uwa.edu.au/adt-WU2010.0002.

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[Truncated abstract] The aim of this research was to define key species-environment relationships to better understand the spatial ecology of demersal fish. To help understand these relationships a combination of multivariate analyses, landscape analysis and species distribution models were employed. Of particular interest was to establish the scale at which these species respond to their environment. With recent high resolution surveying and mapping of the benthos in five of Victoria's Marine National Parks (MNPs), full coverage bathymetry, terrain data and accurate predicted benthic habitat maps were available for each of these parks. This information proved invaluable to this research, providing detailed (1:25,000) benthic environmental data, which facilitated the development and implementation of a very targeted and robust sampling strategy for the demersal fish at Cape Howe MNP. The sampling strategy was designed to provide good spatial coverage of the park and to represent the park's dominant substrate types and benthic communities, whilst also satisfying the assumptions of the statistical and spatial analyses applied. The fish assemblage data was collected using baited remote underwater stereo-video systems (stereo- BRUVS), with a total of 237 one-hour drops collected. Analysis of the video footage identified 77 species belonging to 40 families with a total of 14,449 individual fish recorded. ... This research revealed that the statistical modelling techniques employed provided an accurate means for predicting species distributions. These predicted distributions will allow for more effective management of these species by providing a robust and spatially explicit map of their current distribution enabling the identification and prediction of future changes in these species distributions. This research demonstrated the importance of the benthic environment on the spatial distribution of demersal fish. The results revealed that different species responded to different scales of investigation and that all scales must be ix considered to establish the factors fish are responding to and the strength and nature of this response. Having individual, continuous and spatially explicit environmental measures provided a significant advantage over traditional measures that group environmental and biological factors into 'habitat type'. It enabled better identification of individual factors, or correlates, driving the distribution of demersal fish. The environmental and biological measures were found to be of ecological relevance to the species and the scale of investigation and offered a more informative description of the distributions of the species examined. The use of species distribution modelling provided a robust means for the characterisation of the nature and strength of these relationships. In addition, it enabled species distributions to be predicted accurately across unsampled locations. Outcomes of the project include a greater understanding of how the benthic environment influences the distribution of demersal fish and demonstrates a suite of robust and useful marine species distribution tools that may be used by researcher and managers to understand, monitor, manage and predict marine species distributions.
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Books on the topic "Demersal fish"

1

Merrett, N. R. Deep-sea demersal fish and fisheries. London: Chapman & Hall, 1997.

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O'Connell, Victoria. A preliminary examination of breakaway tagging for demersal rockfishes. Juneau, Alaska: Alaska Dept. of Fish and Game, Division of Commercial Fisheries, 1991.

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Yáñez-Arancibia, Alejandro. Los peces demersales de la plataforma continental del sur del Golfo de México =: The demersal fishes of the southern Gulf of Mexico shelf. México, D.F: Universidad Nacional Autónoma de México, 1986.

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Quinnell, Stephen. Abundance of Puget Sound demersal fishes: 1987 research trawl survey results. Olympia, WA: State of Washington, Dept. of Fisheries, Marine Fish/Shellfish Program, 1991.

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Sample, Terrance M. Demersal fish and shellfish resources of Norton Sound and adjacent water during 1979. Seattle, Wash: National Oceanic and Atmospheric Administration, National Marine Fisheries Service, Northwest and Alaska Fisheries Center, 1985.

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Yáñez-Arancibia, Alejandro. Los peces demersales de la plataforma continental del sur del Golfo de México.: The demersal fishes of the southern Gulf of Mexico shelf. 1, Environmental characterization, ecology and evaluation of species, populations and communities. México, D.F: Universidad Nacional Autónoma de México, Ciudad Universitaria, 1986.

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Oceans, Canada Dept of Fisheries and. Protocols for Research Vessel Cruises within the Gulf Region (Demersal Fish) (1970-1987): Edited by Thomas Hurlbut and Douglas Clay. Moncton, N.B: Fisheries and Oceans, 1990.

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International Workshop on Acoustic Methods for Demersal Species (1991 St. John's, Nfld.). Proceedings of the International Workshop on Acoustic Methods for Demersal Species; recommendations for acoustic surveys of the Northern Cod stock, St. John's, Newfoundland, August 27-30, 1991. St. John's, Nfld: Science Branch, Dept. of Fisheries and Oceans, 1995.

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Schwarzbach, Wiebke. Die Fischfauna des östlichen und südlichen Weddellmeeres: Geographische Verbreitung, Nahrung und trophische Stellung der Fischarten = The demersal fish fauna of the eastern and southern Weddell Sea : geographical distribution, feeding of fishes and their trophic position in the food web. Bremerhaven, Bundesrepublik Deutschland: Alfred-Wegener-Institut für Polar- und Meeresforschung, 1988.

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Peired, Carles Bas. Variacions demogràfiques a les poblacions d'espècies demersals explotades: Els darrers quaranta anys a Blanes i Barcelona. Barcelona: Institut d'Estudis Catalans, 2003.

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Book chapters on the topic "Demersal fish"

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Hagerman, Lars, Alf B. Josefson, and Jørgen N. Jensen. "Benthic macrofauna and demersal fish." In Eutrophication in Coastal Marine Ecosystems, 155–78. Washington, D. C.: American Geophysical Union, 1996. http://dx.doi.org/10.1029/ce052p0155.

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Elliott, Sophie, Rosanna Milligan, Michael Heath, William Turrell, and David Bailey. "Disentangling Habitat Concepts for Demersal Marine Fish Management." In Oceanography and Marine Biology - An Annual Review, 173–92. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2016. http://dx.doi.org/10.1201/9781315368597-4.

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Jeng, Sheng-Wen, Chih-Kai Chiu, and Kai-Siang Gan. "Computer Vision-Based Demersal Fish Length Measurement Technology." In Sensor Networks and Signal Processing, 411–21. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4917-5_30.

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Beverton, Raymond J. H., and Sidney J. Holt. "Requirements for the Regulation of the North Sea Demersal Fisheries." In On the Dynamics of Exploited Fish Populations, 419–36. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-2106-4_20.

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Funamoto, Tetsuichiro. "Population Dynamics of Demersal Fish Focusing on Walleye Pollock (Gadus chalcogrammus)." In Fish Population Dynamics, Monitoring, and Management, 51–75. Tokyo: Springer Japan, 2018. http://dx.doi.org/10.1007/978-4-431-56621-2_4.

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Wagner, Hans-Joachim. "Sensory Brain Areas in Deep Sea Slickheads, Eels, and Grenadiers: Comparison of Mesopelagic and Demersal Species." In The Senses of Fish, 128–46. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-94-007-1060-3_6.

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Ahmed, Inal, Belkacem Yasmina, Benfares Redouane, Rouidi Samir, Bachouche Samir, and Boulahdid Mostefa. "Bioaccumulation Assessment of Trace Metals by Three Main Demersal Fish from Algerian Coast." In Recent Advances in Environmental Science from the Euro-Mediterranean and Surrounding Regions (2nd Edition), 573–80. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-51210-1_90.

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Labropoulou, M., and C. Papaconstantinou. "Community structure of deep-sea demersal fish in the North Aegean Sea (northeastern Mediterranean)." In Island, Ocean and Deep-Sea Biology, 281–96. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-017-1982-7_26.

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Frapiccini, Emanuela, Giulio Pellini, Alessio Gomiero, Giuseppe Scarcella, Stefano Guicciardi, Anna Annibaldi, Mattia Betti, and Mauro Marini. "Microplastics and Polycyclic Aromatic Hydrocarbons Occurrence in a Demersal Fish (Solea solea) in the Adriatic Sea." In Springer Water, 226–33. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-45909-3_35.

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"Demersal fish studies." In Ecological Studies in Tropical Fish Communities, 212–25. Cambridge University Press, 1987. http://dx.doi.org/10.1017/cbo9780511721892.010.

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Conference papers on the topic "Demersal fish"

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Madsen, Nina A. H., Karl Gunnar Aarsæther, Bent Herrmann, Kurt Hansen, and Jørgen H. Jensen. "The Physical Behaviour of Seine Ropes for Evaluating Demersal Seine Fishing." In ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/omae2015-41892.

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Demersal seining is an active bottom fishing method, which apply seine ropes and a seine net. The seine ropes and net are laid out on the fishing ground with the seine ropes encircling an aggregation of fish on the seabed. The area on the seabed encircled by the seine ropes is typical much larger than the swept area that will be covered by the seine net during the fishing process. Therefore, the catching performance of a demersal seine depends on the efficiency by which the seine ropes are able to herd the fish into and maintain them in the path of the net until they are overtaken by it in the late stages of the fishing process. This article describes flume tank experiments to validate a numerical model. This model simulates the physical behaviour of seine ropes during the fishing process. The experiments are conducted for varying physical properties of the ropes and for different layout patterns. The seine ropes are hauled back at different speeds. A motion tracking system, based on stereo vision, is applied to record the gradual change in the area encircled by the ropes. The experimental results from the flume tank are compared with data obtained using the simulation model. Finally, the validated simulation model is applied for predictions.
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Boland, G., and G. Lewbel. "The Estimation of Demersal Fish Densities in Biological Surveys Using Underwater Television Systems." In OCEANS '86. IEEE, 1986. http://dx.doi.org/10.1109/oceans.1986.1160565.

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Mueter, F. J., and B. L. Norcross. "A Multivariate Approach to Monitoring Changes in Species Composition of a Demersal Fish Community." In Ecosystem Approaches for Fisheries Management. Alaska Sea Grant, University of Alaska Fairbanks, 1999. http://dx.doi.org/10.4027/eafm.1999.42.

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Schmidt, Jon A., Steven W. Ellsworth, R. Allen Brooks, Darren F. Bishop, Mark G. Bisett, Michael C. Aubele, and H. Ed Watkins. "Colonization and Habitat Use by Marine Fish and Epifauna of the Gulfstream Pipeline Habitat Replacement Structures." In 2006 International Pipeline Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/ipc2006-10374.

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Gulfstream Natural Gas System, L.L.C. (Gulfstream) constructed a 36-inch-diameter pipeline in 2001 to transport natural gas from plants in Mississippi and Alabama to markets in central and southern Florida. The route of the marine portion of the pipeline originates from the shoreline of Mississippi and Alabama in Mississippi Sound and transverses the Gulf of Mexico, making landfall in Tampa Bay. Activities such as the installation of the pipe on the seafloor, the subsequent lowering of the pipe beneath the seafloor, and the mooring of construction vessels used in these processes were anticipated to disturb the seafloor and associated resources. Compensatory mitigation for project impacts to live hard-bottom was undertaken with the installation of habitat replacement sites consisting of either limestone boulder groupings or pre-fabricated reef modules. As part of the mitigation monitoring plan, Gulfstream has documented the success of the limestone’s placement and stability within the habitat replacement sites, monitored colonization by sessile epifauna, and censused the reef fish populations found utilizing the created habitat. The monitoring protocol includes diver collected still photography and Bohnsack point counts for fish. The created habitat provides a greater amount of habitat relief/complexity than natural hard/live bottom and is thriving in terms of both the recruitment of sessile epifauna and habitat use by a diverse demersal and commercially important fish community. Thus the limestone boulder and reef module areas created as part of the Gulfstream project appear to be a very successful means of habitat mitigation.
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Madirolas, Adrian, Gustavo Alvarez Colombo, and Federico Castro Machado. "Vertical distribution of a demersal fish species and its implication on the acoustic detection and assessment of argentine hake (Merluccius hubbsi)." In 2015 IEEE/OES Acoustics in Underwater Geosciences Symposium (RIO Acoustics). IEEE, 2015. http://dx.doi.org/10.1109/rioacoustics.2015.7473630.

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Reports on the topic "Demersal fish"

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Schram, Edward, and Pieke Molenaar. Direct mortality among demersal fish and benthic organisms in the wake of pulse trawling. IJmuiden: Wageningen Marine Research, 2019. http://dx.doi.org/10.18174/504087.

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Schram, Edward, Pieke Molenaar, and Susan de Koning. Direct mortality among demersal fish and benthic organisms in the wake of pulse trawling. IJmuiden: Wageningen Marine Research, 2021. http://dx.doi.org/10.18174/541793.

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Volwater, Joey, and Ralf van Hal. Monitoring zeebodemafval in de Noordzee en Waddenzee naar aanleiding van de containerramp met de MSC Zoe : Beam trawl survey en Demersal Fish survey 2019. IJmuiden: Wageningen Marine Research, 2019. http://dx.doi.org/10.18174/506606.

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