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大通湖是我省最大的内陆养殖湖泊,水面10万余亩,平均水深2.5米,年产鲜鱼近千吨。自1980年起以鳙、鲢放养为主,搭配放养草、青鱼,放湖比例为6:2:2;1986—1988年鳙鱼产量均占该湖年总产鲜鱼重量的67％左右。为准确估测鳙鱼年龄与生长情况,确定合理的养殖生产周期,本文研究了该湖1988年冬捕渔获物中随机取样的150尾鳙鱼的年龄组成、生长指标及生长速度等;对合理放养规格与养殖生产周期,适宜起捕规格进行了探讨。材料与方法在1988年冬捕渔获物中随机取得鳙鱼150尾,现场做常规生物学测定,自背鳍基部下方,侧线上方逐尾取鳞片8—10枚。洗净后置双目体视解剖镜下观测年龄;并依不同体重取10尾鳙鱼的脊
Datong Lake is the largest inland aquaculture lake in our province, with a surface area of more than 100,000 mu and an average depth of 2.5 meters, with an annual output of nearly 1,000 tons of fresh fish. From 1980 onwards, silver carp and silver carp were mainly stocked with stocking grass and black carp. The proportion of releasing lakes was 6: 2: 2. From 1986 to 1988, the production of catfish accounted for about 67% of the total fresh fish produced in that year. In order to accurately estimate the age and growth of anchovy, and to determine the reasonable breeding production cycle, this paper studied the age composition, growth index and growth rate of 150 randomly selected catfish from the catch of winter lake in 1988; Reasonable stocking specifications and breeding production cycle, suitable for catching the specifications were discussed. MATERIALS AND METHODS: Fifty-five catfish were randomly selected from winter catches in 1988, and routine biological measurements were made on site. Eight to ten scaly scales were taken from the bottom of the dorsal fin and above the lateral line. Wash the rear binocular stereo anatomical microscope observation age; and according to different body weight to take 10 tilapia ridges