Abstract
This study was performed to identify the catch composition of Düzce coast (southwestern
 Black Sea) at depths of 30-110 meters by bottom trawl between September 2014 and August
 2015. In the catch compositions of the Düzce coast, the abundance of the first, second and third
 species were Merlangius merlangus with 73.12% (1290.29 kg / km2
 ), Gobius spp. with 9.30%
 (164.04 kg/km2
 ) and Mullus barbatus with 9.05% (159.61 kg / km2), respectively. The other 33
 species make up 8.53% of total fish biomass. When seasonal distribution was examined, the total
 catch of fish were 1038.54, 2552.37, 1068.72, 5132.96 kg/km2
 , of which economic (target) fish
 species (Merlangius merlangus) constitute 745.72, 1726.14, 724.58, 4910.15 kg/km2
 in autumn,
 winter, spring and summer respectively. In this study, fishing a very high rate of discard whiting
 in little sizes draws the attention. Whiting constitutes 56% of discard. Single or sporadic captures
 were also recorded for Acipenser stellatus, Trachurus trachurus, Spicara smaris, Lophius
 piscatorius, Serranus hepatus and Hippocampus hippocampus. Moreover, in this study, red list
 status for 36 fish species belonging to 27 family in Düzce coasts were considered with the Red List
 published by the International Union for conservation of Nature and Natural Resources (IUCN).
 As a result of this comparison, it was determined that 2 species Critically Endangered (CR), 5
 species Vulnerable (VU), 22 species Least Concern (LC), 4 species Not Evaluated (NE), 2 species
 Data Deficient (DD).
Highlights
Düzce is a prominent segment of Black Sea with its 35 km coast line along the Akçakoca district
It is thought that sandy deep structure of Düzce coasts makes other region trawls to prefer this region and this makes Düzce coasts to be the key area for such studies and it is planned that this study reveal important output for intended planning to be done for the future of regional fishery
In the present study, the effects of bottom trawl fishery on the fishes and trawl catch composition and target, by-catch and discard composition and fish stock biomass of bottom trawl fishery were examined for the first time in the Düzce coast, Turkey
Summary
Düzce is a prominent segment of Black Sea with its 35 km coast line along the Akçakoca district. It stands as a major observation point to monitor the general issues of Black Sea. Extreme investment being made in the sector with developed technologies lately makes fish stocks to be exposed to extreme fishing pressure. In the present study, the effects of bottom trawl fishery on the fishes and trawl catch composition and target, by-catch and discard composition and fish stock biomass of bottom trawl fishery were examined for the first time in the Düzce coast, (southwestern Black Sea), Turkey
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