| Catch Effıcıency And Catch Composıtıon Of Seıne Nets In The Istanbul Straıt
In this study, it was tried to determine the certain characteristics of the species caught in the seine fishery in the Istanbul Strait in 2009-2010 fishing season such as catch compositions, commercial and non-target catch ratios, catch per unit efforts (CPUE) and the length distributions of the economic individuals. Futhermore, it was revealed that the technical features of the beach seine nets as well as the seine boat.
From 20 beach seine operations, it was obtained the species belonging to three different taxonomic groups with 26 osteichthyes, 2 crustacea and 1 mollusca. It was determined that Mullus surmuletus, Trachurus trachurus and Scorpaena porcus were most caught and besides the red mullet which were target species, it was also determined that 28 different species belonging to the three taxonomic groups were also caught. Of all the non-target species, it was seen that 13 were commercial, 14 were non-commercial, and only one was under threat species.
The total catch consist of the target species, which were 77,5 % in numbers and 65,9 % in weight, and the non target catch ratio was 22,5 % in numbers and 34,1 % in weight respectively. Of the total catch, the ratio of the commercial species in non target catch was 31,3 %. The ratio of the discard catch that the fishermen did not take into account was 2,8 %.
In this study, it was found that the discard ratio in the beach seines together with the small-scale fleet having limited catch efforts in the Istanbul Strait was low but the ratios of the commercial species under the legal length size were high. It was clear from the data that the growth overfishing was seen in the commercial species. Therefore, this causes a huge economic loss.
Dostları ilə paylaş: |
