Estimation of CPUE and CPUA of pufferfish (Tetraodontidae) caught by the Bottom Trawl Fishery in the eastern Mediterranean Coasts

Authors : Cemal TURAN

Pages : 108-119

Doi:10.28978/nesciences.1159210

View : 14 | Download : 7

Publication Date : 2022-08-08

Article Type : Research Paper

Abstract :Two indicators of pufferfish communities, catch per unit effort insert ignore into journalissuearticles values(CPUE); and catch per unit area insert ignore into journalissuearticles values(CPUA);, were used with surveys of bottom trawl fishery to elucidate the level of the catch of each pufferfish species in the Mediterranean coasts of Turkey, comprising the Iskenderun Bay, Mersin Bay, and Antalya Bay. The surveys were conducted seasonally in 2019. The average rate of CPUE for Lagocephalus sceleratus, L. suezensis, L. spadiceus, and Torquigener flavimaculosus were 2.2, 0.8, 0.5, and 0.2 kg km-2, respectively that the highest CPUE values were in winter insert ignore into journalissuearticles values(8.0 kg km-2); for L. sceleratus and also lowest was in winter insert ignore into journalissuearticles values(0.08 kg km-2); for L. spadiceus. The highest and lowest CPUE values were at the depth of 20-50 m insert ignore into journalissuearticles values(2.7 kg km-2); for L. sceleratus and 50-80 m insert ignore into journalissuearticles values(0.08 kg km-2); for T. flavimaculosus, respectively. The highest CPUE values insert ignore into journalissuearticles values(3.5 kg km-2); were found at the sandy bottom for L. sceleratus, and the lowest one insert ignore into journalissuearticles values(0.01 kg km-2); was at the hardy-ground for T. flavimaculosus. The average annual CPUA of pufferfish species at the Iskenderun, Mersin, and Antalya bays was estimated as 15.6, 28.4, and 6.81 kg, respectively, with a mean value of 17.3 kg/day/boat. In multiple correspondence analysis, L. sceleratus showed a great contribution to CPUE and CPUA data. However, T. flavimaculosus revealed contribution, especially in catch numbers which were positively affected by precipitation. L. spadiceus, L. suezensis, and T. flavimaculosus were positively affected by depth, temperature, month, season, and bottom structure.
Keywords : Pufferfish, CPUE, CPUA, Mediterranean coast of Turkey