Management Recommendations for Common Carp Fisheries in Turkey in Light of Their Reproductivity and Gear Selectivity
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Abstract
Common carp Cyprinus carpio (Linnaeus, 1758) is a very important freshwater commercial species in Turkey, but landings there decreased by 73 % from 2008 to 2019. There are knowledge gaps regarding the reproductive biology of the species and the selectivity of fishing gear types in Turkish lakes. This study aims to determine appropriate management measures for common carp fisheries based on gillnet and trammel net selectivity and reproductive characteristics of the species. A study was undertaken with local commercial fishers between June 2015 and December 2016 in Demirköprü Dam Lake in Western Turkey. The spawning season peaked in March, with a secondary spawning season suggested in October/November. Their length at 50 % maturity (Lm50) was 38.7 cm for females and 32 cm for males. Modal lengths for gillnets and trammel nets determined by SELECT method were larger than the minimum landing size (40 cm) and the Lm50 values. However, sub-minimum landing size individuals were captured at high rates by both types of nets with 65 mm mesh. Trammel nets had lower modal lengths and larger spread values than gillnets of the same mesh size. These results demonstrate that some management measures currently applied in carp fishery management are insufficient for stock sustainability.
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References
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