SELECTIVITY OF HOOKS IN DIFFERENT TYPE AND SIZE USED IN ANGLING
Project no. 1149 · Status: Kapanmış · 2015
Summary
Angling fishery is one of the most common fishing methods of the world. In this study, traditional “J” hooks used in angling fishery and circle hooks, have an increased widespread usage, were tested together in order to compare the fishing efficiency and the survival ratio of the caught fishes after removed from the hook. Trials were realized in Urla region where is located in İzmir Bay. The angles are prepared tha composing of 4 hooks. The determination of hooks in the present work were referred from previous studies in the region and as selected Owner Mutu 50660 “2/0” (K1), “1/0” (K2) (kahle type) and Owner Furansu 50560 “1” (J1), “2” (J2) (“J” type). 39 fishing trials were realized with small scale fishing boats between June 2015 – September 2016. Totally 1301 specimens were captured according to 17 species. 703 individuals of them with “J” hooks and the rest of the 598 were hooked with kahle hooks. Totally 4 fish cages were used for each type of hook in survival observations. Each removed alive fish is observed from in those cages during 5 hours. As a result of this study; CPUE (catch per unit efort) values for kahle hooks and “J” type hooks were calculated as 1,53 and is 1,80 respectively and there was no differences between the values (P>0,05). It was determined that smaller hooks have more fishing efficiency and catch smaller sized individuals (p<0,05). According to species, discard ratio was calculated as 3,5% for caught specimens for all hooks. “J” hooks caused 3 times more foul hooking than kahle hooks. Survival ratios of released specimens to the sea were found higher for kahle hooks than “J” hooks according to both foul hooking and hooking places inside of the mouth during the fishing operations (p<0,05).