长江天鹅洲故道、老河故道鱼类群落结构比较

１９９３年２月至１９９４年１月调查期间，在天鹅洲故道采集鱼类４９种，分属５目１３科，鱼类区系组成为湖泊型和江河型。在老河故道采集鱼类３７种，分属４目１０科，鱼类区系组成已基本变为湖泊型。由于捕捞过度，天鹅洲故道鱼类群落出现小型化、低值化趋势，年总渔获量的６６．１８％为小型的和低值的鱼类，必须控制捕使资源得以休生养息。老河故道鱼类群落结构已受到人工放养和捕捞的调节，进一步调整人工放养是提高其鱼类多样

THE COMPARISON OF FISH COMMUNITY STRUCTURES OF TIANEZHOU OLD COURSE AND LAOHE OLD COURSE OF CHANGJIANG RIVER

From Febuary,1993 to January,1994, fish of 49 species belonging to 5 orders, 13 families was collected from Tianezhou Old Course. Fish fauna included riverine and lacustrine types; Fish of 37 species belonging to 4 orders, 10 families was collected from Laohe Old Course. Fish fauna was basically consisted of lacustrine type. In the Tianezhou Old Course, over fishing is a major problem, which causes small sized and low valued trend of fish community. Small sized and low value fish occupied 66.18% of annual yield. Fishing control is necessary to protect fish resource. In Laohe Old Course, fish community has been regulated by artificial stocking. The further adjustment of artificial stocking structure is one of the major approaches to increase fish production and diversity.