As a part of the tradition，fishermen lower their nets into the water close to the banks of the river.As they do this，their pet otters also dive tails up into the water with a splash.The animals do not catch the fish themselves，but chase them towards the fishing nets for the fishermen to haul in.Otter fishing is generally practiced during the night，with some fishermen throwing their nets until dawn trying to catch enough fish to support their families.，in recent years，have become very scarce and are hard to catch.“The kinds of fish we used to find with our father，we don’t see them anymore，”said Vipul，who is in his 20s.According to Mohammad Mustafa Feeroz，a professor of zoology at Dhaka’s Jahangirnagar University，the natural fish population has reduced drastically because they are simply unable to breed.“Water pollution from oil and the use of pesticides(杀虫剂)in paddy fields，as well as over catching are all having an impact，”he said.，we used to get plenty of fish in the river，”said Shushendu Shikder，an otter fisherman.“We were able to take care of our ，even if we keep fishing for the whole night，we are not getting enough.We used to have 15 or 20 otters in every family.Now，we have only three or four otters because we cannot maintain them and feed them.”Unfortunately，these fishermen do not know how to catch fish without the help of otters.

　　Wildlife experts are worried too，not about the fishermen or the fish，but about the otters.Short­haired otters are an endangered species in Bangladesh.Otter fishing is one of the few reasons for their conservation.If the practice is lost，the otter population will begin to fade as well.解题导语　用水獭捕鱼是孟加拉国的一项古老传统，但现在鱼类的减少使这一传统面临着威胁。The future of otter fishing is unsure because

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