Catch Composition of Different Bottom Trawl Cod-ends in the Western Black Sea

Year 2023, Volume: 38 Issue: 1, 53 - 61, 24.01.2023

İbrahim Tamer Emecan , Taner Yıldız , Uğur Uzer , Ahmet Çatal , Hamdı Moussa , Celalettin Aydın , Firdes Saadet Karakulak

https://doi.org/10.26650/ASE20221187355

Abstract

Across the Mediterranean and the Black Sea, an improvement in technological adoption which optimizes the environmental benefits of fisheries is needed. The testing of quality standards in trawl fishing is one of the essential components. In an experiment, we tested four bottom trawl cod-ends in the western Black Sea to determine the characteristics of the catch composition. Fishing trials were conducted by 40 mm diamond (40D), 44 mm diamond (44D), 40 mm square (the 40S), and 40 mm 90-degree turned (40T) mesh cod-ends for 31 bottom trawling hauls. The multivariate analysis of catch composition indicated a significantly higher differentiation between 40D and 40T cod-ends, mainly characterized by five species: Merlangius merlangus, Mytilus galloprovincialis, Trachinus draco, Mullus barbatus, and Uranuscopus scaber. The difference in the shape of cod-end meshes reflected the variation in the catchability and catch composition. However, the 40S and 40T showed 80% similarity in catch composition. Among cod-ends, 40T yielded in lowest catch per unit effort for both commercial and other species. Adoption of gear specially made to catch more target species can help bottom trawl fisheries further improve their ecological and economic sustainability. 

Keywords

Black Sea, Bottom trawl, catch composition, cod-end

Supporting Institution

Scientific Research Projects Coordination Unit of Istanbul University

Project Number

FYO-2019-20955

Thanks

This study was supported by the Scientific Research Projects Coordination Unit of Istanbul University, Turkey (Project # FYO-2019-20955). The authors thank all technical crew of the R/V YUNUS S.

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