Cetacean Fishery Interaction during operation of major Fishing Systems of India

Abstract

Cetacean interaction with fishing gear has been reported widely around the globe. This study is aimed at finding out the fishery most prone to cetacean attack along the Indian coast, and to identify the species causing the attacks, the extent of damage to fishing gear, the seasonal variation and catch loss in different fisheries and suggest mitigation measures. This was assessed by conducting face to face interviews with the crew and owners of the fishing vessels from 20 major harbours along Indian coast. The results of the study show that cetacean fishery interactions are frequent in all type of fishing gears operated in the country. Small gillnets that operate near the shore are most prone to cetacean attacks. Gear damage and depredation by cetacean and non-cetacean species cause economic loss to the tune of Rs. 0.5 – 2.0 lakhs per incident in gillnet and purse seine/ ring seine fishery. The study shows that about 15.3% of respondents reported incidental bycatch of cetaceans, mainly in gillnets, purse seines and trawls. The number of interactions are found to be maximum during pre-monsoon season. It has also been observed that gillnets and purse seine/ ring seine are the most economically affected fisheries. Fishers employ mitigation measures like scaring away the animals or delaying fishing. The use of acoustic pingers can be considered as a management option in India.