静水海水池塘投饵养殖非鲫的鱼产力和负荷力

FISH PRODUCTIVITY AND CARRYING CAPACITY FOR FEEDING TAIWAN RED TILAPIA CULTURE IN STATIC SEAWATER PONDS

用8个3m×8m的实验围隔，研究了静水海水池塘村投何养殖台湾红非鲫（Ore-ochromismossambicus×0．niloticus）的鱼产力和负荷力。放养量为0．67、1．00、1．33、1．67尾／m^2四个水平。每日投喂颗粒饲料（粗蛋白为32％）4次，投饵量以鱼体重的3％为基础，再根据鱼的摄食情况加以调整，以1．5h内吃完为准。实验中监测了水体理化因子──水温（WT）、盐度（SAL）、透明度（SD）、pH、溶解氧（DO）、化学耗氧量（COD）、总磷（TP）、总氮（TN）、总氨氮（TAN）和非离子氨（UIA）的变化。当放养量较高的组水质超过水质标准，生态系趋于崩溃，即剩余组水质正常且能保持稳定时，则其中载鱼量最大的一组代表水体时鱼的负荷力。其投饵量代表水体对饵料的负荷力。实验表明静水海水池塘的鱼产力为2．00g／（m^2·d），对鱼的负荷力为2150kg／hm^2，对饵料的负荷力为48kg／（hm^2·d）。放养量以10000尾／hm^2为宜。

Fish productivity and carrying capacity of static Seawater ponds for feeding tilapiaculture were studied in 8 enclosures each of 3 m x 8 m stocked with Taiwan red tilapia (Oreochrocus mossambicus x 0. niloticus). The environmental factors, including wate temperture (WT), salinity (SAL), Secchi disk depth (SD), pH, dissolved oxygen, chemical oxygen demand (COD), totalnitrogen(TN), total phosphorus(TP), total ammonia nitrogen(TAN), nitrite nitrogen(NO_2-N) and unioized ammonia(UIA) had been monitored during the experiment from June 26 to Sept. 12,1994. Fish productivity 2. 00 g/(m2 . d) in static seawater ponds, and the carrying capacity for fish and foodstuff was about 2 150kg/hm2 and 48 kg/(hm2 d), respectively.