Demersal Fish Diversity and Molecular Taxonomy in the Bering Sea and Chukchi Sea
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Abstract:
Abstract DNA barcoding by sequencing a standard region of cytochrome c oxidase subunit I (COⅠ) provides an accurate, rapid method for identifying different species. In this study, we provide a molecular taxonomic assessment of demersal fishes in the Bering Sea and Chukchi Sea based on DNA barcoding, and a total of 123 mitochondrial COⅠ partial fragments with a length of 652 bp were obtained. The consensus among all sequences was determined by alignment via a BLAST search in GenBank. Phylogenetic relationships were reconstructed on the basis of neighbor-joining (NJ) trees and barcoding gaps. The 39 species investigated in this analysis were distributed among 10 families. Five families within Scorpaeniformes including 19 species accounted for almost half of the species. The next largest group was Perciformes, with 9 species, followed by Pleuronectiformes and Gadiformes, with 5 species each, and the smallest number of species belonged to Rajiformes. At the family level, Cottidae was the largest family, followed by Zoarcidae, accounting for 8 species. The other eight families—Gadidae, Pleuronectidae, Psychrolutidae, Agonidae, Liparidae, Ammodytidae, Hexagrammidae, and Rajidae—accounted for a smaller proportion of species. In brief, our study shows that DNA barcodes are an effective tool for studying fish diversity and phylogeny in the Bering Sea and Chukchi Sea. The contribution of DNA barcoding to identifying Arctic fish species may benefit further Arctic fish studies on biodiversity, biogeography and conservation in the future.Keywords:
DNA Barcoding
Demersal zone
Perciformes
Demersal fish
Scorpaenidae
Cottidae
Gadidae
The distribution of estuarine and freshwater fish species caught during the Swedish‐Russian Expedition' Tundra Ecology–94’is presented. Thirteen sites along the Russian part of the Arctic Sea coast were sampled and a total of 21 fish species of the families Salmonidae, Coregonidae, Thymallidae, Osmeridae, Cyprinidae, Catostomidae, Balitoridae, Gadidae, Gasterosteidae, Percidae, Cottidae, Pleuronectidae were recorded. Some records were new to particular basins.
Cottidae
Percidae
Gadidae
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Demersal fish
Cottidae
Demersal zone
Gadidae
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The composition of the demersal fish fauna of the Barents Sea, and the ranges of most of the fish species, have been relatively poorly known. From 257 bottom trawl hauls distributed in a uniform grid pattern over the southwestern part of the Barents Sea in summer 2000, all fish were identified. The sampled area included the Polar Front zone where warm Atlantic water meets cold (subzero) polar water. The material was used to map the distribution of the demersal fish species, and to analyse their distribution in relation to temperature, depth and salinity. Fifty-eight species were recorded. A fauna characterized by Gadidae and Scorpaenidae was found in the warmer part of the sea, whereas a cold-water fauna of mainly Cottidae, Zoarcidae and Stichaeidae was evident from the Polar Front zone and northwards. In logistic regression analyses temperature was the most important factor associated with the distribution of species (for 26 of the 27 species analysed), but associations with salinity (19 species) and depth (15 species) were also found. The mapping considerably revised the distribution in relation to previous knowledge for 37 species, and the new and more accurate range maps provided here may serve as baseline information for future monitoring of the fish fauna in the Barents Sea.
Demersal fish
Polar front
Cottidae
Demersal zone
Scorpaenidae
Species distribution
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The composition of the demersal fish fauna of the Barents Sea, and the ranges of most of the fish species, have been relatively poorly known. From 257 bottom trawl hauls distributed in a uniform grid pattern over the southwestern part of the Barents Sea in summer 2000, all fish were identified. The sampled area included the Polar Front zone where warm Atlantic water meets cold (subzero) polar water. The material was used to map the distribution of the demersal fish species, and to analyse their distribution in relation to temperature, depth and salinity. Fifty-eight species were recorded. A fauna characterized by Gadidae and Scorpaenidae was found in the warmer part of the sea, whereas a cold-water fauna of mainly Cottidae, Zoarcidae and Stichaeidae was evident from the Polar Front zone and northwards. In logistic regression analyses temperature was the most important factor associated with the distribution of species (for 26 of the 27 species analysed), but associations with salinity (19 species) and depth (15 species) were also found. The mapping considerably revised the distribution in relation to previous knowledge for 37 species, and the new and more accurate range maps provided here may serve as baseline information for future monitoring of the fish fauna in the Barents Sea.
Demersal fish
Polar front
Cottidae
Demersal zone
Scorpaenidae
Species distribution
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Species composition of ichthyoplankton community was analyzed, relative abundance of eggs and fish larvae and seasonal changes in the qualitative composition of ichtyoplankton catches was estimated based on the data of the complex researches in Avachinskaya Bay in 2014–2017. In general 25 species from 11 famelies were found for the whole period of researches in the waters of Avachinskaya Bay. The eggs and the larvae revealed in our catches represented the families, including Pleuronectidae, Gadidae, Cottidae, Ammodytidae, Agonidae, Hexagrammidae, Liparidae, Osmeridae, Ptilichthyidae, Stichaeidae and Scorpaenidae. The ichthyoplankton in Avachinskaya Bay consisted in 92% of eggs and in 8% of larvae. The ichthyoplankton complex was the most reach and abundant in April and May.
Ichthyoplankton
Cottidae
Scorpaenidae
Gadidae
Pleuronectidae
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Fishes collected at Raleigh on the Newfoundland side of the strait of Belle Isle are listed with brief notes on each. There are thirty-one species, belonging to seventeen families, the principal ones being Cottidae (4), Blenniidae (3), Gadidae (4), and Pleuronectidae (5).
Cottidae
Gadidae
Pleuronectidae
Scorpaenidae
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Abstract Populations of demersal rockfish of the genus Sebastes are challenging to assess because they inhabit rocky areas that are difficult to sample with trawl gear. In contrast, longline gear can sample rocky areas, but several factors besides fish density can affect the relationship between catch rates and density. In this study, longline catch rates of shortraker rockfish Sebastes borealis and rougheye rockfish S. aleutianus were compared with observations of density from a manned submersible to evaluate the species’ catchability on longline gear. On separate occasions, rockfish behavior in the presence of longline gear was observed from the submersible. Densities averaged 3.0 shortraker and rougheye rockfish (combined) per 330 m 2 of bottom (the effectively sampled area of a 100‐m transect). Longline catch rates averaged 2.7 shortraker and rougheye rockfish per skate of 45 hooks. Longline catch rates were not statistically affected by submersible observations. There was a positive trend between density and longline catch rates, but the relationship was not significant. As observed from the submersible, the proportion of fish free‐swimming near the longline increased through the duration of the set, indicating that rockfish were attracted to the line faster than they were caught. The catching process for shortraker and rougheye rockfish lasts longer than for more mobile species such as sablefish Anoplopoma fimbria .
Rockfish
Demersal zone
Sebastes
Demersal fish
Scorpaenidae
Bycatch
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Cottidae
Ichthyoplankton
Gadidae
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Gadidae
Carangidae
Perciformes
Cottidae
Scorpaenidae
Actinopterygii
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The fish species composition and variation in the Youngil Bay, East Sea of Korea, were investigated every month from January, 2001, to December, 2002, using gill nets for sample collection. A total of 63 fish species belonging to 31 families under 10 orders, and a total of 40 species belonging to 26 families under 8 orders, were identified in 2001 and 2002, respectively. Of these, the families Pleuronectidae (9 species), Scorpaenidae (8 species) and Cottidae (5 species) were dominant in 2001, whereas Pleuronectidae (4 species), Cottidae (3 species) and Hexagrammidae (3 species) were dominant in 2002. The number of species recovered was the highest in August, 2001 (34 species) and January and September, 2002 (14 species each), and lowest in May, 2001 (6 species) and December, 2002 (5 species). The principal component analysis for each year showed that fish species composition differed over time even within the same sample area. In addition, the relationship between PC scores and temperature showed a positive relationship in 2001, but a negative relationship in 2002.
Cottidae
Pleuronectidae
Scorpaenidae
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