Hakan Aksu‡, Yakup Erdem§, Süleyman Özdemir|Corresponding author: Hakan Aksu ( aksuhakan@hotmail.com ) © Hakan Aksu, Yakup Erdem, Süleyman Özdemir. This is an open access preprint distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Citation:
Aksu H, Erdem Y, Özdemir S (2022) The effects on target catch, bycatch and discard of using multifilament and monofilament sardon on the trammel nets in the Black Sea small scale fisheries. ARPHA Preprints. https://doi.org/10.3897/arphapreprints.e98663 |  |
Background. In the Sinop region, many species are caught as non-targets during the target species catching with gill nets. Sardon was used to prevent the bottom creatures (crabs, snails, etc.) climbing these nets used on the ground from climbing. This study was carried out in 13 fishing operations in the inner harbor area of Sinop, from September through November of 2004. Trammel nets were used, which has 32 mm mesh size and target fish species of the fishing gear is red mullet (Mullus barbatus) in the study.
Materials and methods. Three net groups were used in the experiments, without sardon (A0) for the control net, multifilament with sardon (A1) and monofilament with sardon (A2) respectively.
Results. 65.3% Osteichthyes fish (696 specimens), 16.8% Mollusca (179 specimens), 16.4% was arthropoda (175 specimens) and 1.5% was Chondrichthyes fish (16 specimens) of catch obtained from the operations were form. A total 124 specimens as the target species (red mullet), 398 specimens as bycatch species, and 544 specimens as discarded species were captured sea trials. Catch ratio of A0, A1 and A2 nets were determined 51.88%, 21.58% and 26.55% respectively. 48.38% of the target species, 30.40% of the bycatches and 57.53% of the discarded catch were caught by the A0 net. 25.81% of the target species, 45.23% of the bycatches, and 18.57% of the discard catch were caught with A1 net. 25.81% of the target species, 24.37% of the bycatch and 24.37% of the discarded catch were caught by the A2 net.
Conclusions. The results showed that the use of sardon on trammel nets in the Black Sea coastal fisheries caused a slight decrease in target fish catch, but significantly decreased the amount of discarded catch.