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| Effects of Different Sets of China's Tuna Purse Seine Fishery on Cetaceans Bycatch |
| LU Siqi1, DAI Xiaojie1,2,3, GAO Chunxia1,2,3, LI Junyi1 |
1. College of Marine Science, Shanghai Ocean University, Shanghai 201306, China;
2. National Ocean FisheryEngineering Technology Research Center, Shanghai 201306, China;
3. Key Laboratory of Sustainable Exploitation ofOceanic Fisheries Resources, Ministry of Education, Shanghai 201306, China |
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Abstract Cetaceans are the top predators of the marine ecosystem in the Central and Western Pacific, and bycatch in tuna purse seine fisheries has been one of the most interesting hotspot in cetaceans conservation in recent years. In this study, the effects of two-type setting operations including free swimming school (FSC) and fish aggregation devices (FADs) on cetacean bycatch were analyzed by different fishing areas, by different fishing time, by months and years of setting, based on the data from the Chinese tuna purse-seine fishery in the Western and Central Pacific Ocean (N 10°—S 13°, E 144°—W 149°) from 2016 to 2019. A total of 15 species of cetaceans bycatch were recorded with total of 219 individuals. The results showed that the main distribution area of cetacean bycatch in the Western and Central Pacific Ocean was the Kiribati exclusive economic zones; the time period of cetacean bycatch under FSC operation was more evenly distributed and the difference was not significant (P>0.05), while the time period of cetacean bycatch under FADs operation was mainly concentrated in 16:00—19:00 and the difference was significant (P<0.05 ); the bycatch of cetaceans was high in January, July and November, and the variability of cetacean bycatch in different months under FSC operations and FADs operations were not significant (P>0.05); the average mortality rate of cetaceans caused by FSC and FADs operations was 43.04% and 33.33%, respectively, and the variability of cetacean mortality between the two operation methods was not significant (P>0.05), while there were some differences in bycatch mortality rates of different species affected by the two operations. The finding indicated the effects of FSC and FADs on cetacean bycatch and proposed recommendations for cetaceans conservation, aiming to provide a scientific reference for cetaceans conservation and management in the western and central Pacific Ocean.
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Received: 23 March 2021
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