天津天嘉湖渔业生物学基础调查

按照《内陆水域渔业自然资源调查手册》对天嘉湖水化学、浮游生物、底栖动物、鱼类状况进行了调查。结果表明:天嘉湖水质良好,适合鱼类生长;鱼类天然饵料生物量相对较低,不适合鲢鳙生长;主要渔获物为人工放养的异育银鲫Carassiusauratusgibelio.,今后应依据其自然条件以放养异育银鲫为主,少放鲢鳙;放养12cm以上的大规格的鱼种,提高成活率和回捕率;控制凶猛鱼类的种群数量。

Basic Investigation of Fishery Biology of Tianjia Lake in Tianjin

On the basis of handbook of fishery natural resource investigation in inside water area, the water quality, plankton, benthon and fishery were investigated in Tianjia lake in Tianjin. The results indicate that the favourable water quality was fit for the fish growth, but the poor plankton could not supply full food for silver carp and bighead. The silver crucian carp Carassius auratus gibelio was main catches in Tianjia lake.In the future,the silver crucian carp should be bred mainly with few silver carp Hypophthalmichthys.mditrix(c.et.v) and bighead Aristichthys nobilis (Richaxclson) in the Tianjia lake. The length of fish bred in the lake should be more than 12 cm for raising the fish survival rate and catching rate.The fierce fishes should be controlled.