论文部分内容阅读
湘潭市郊区长城乡综合渔场,自1984年以来,由于不按科学办事,为了提赢鱼产量,不顾鱼塘条件,盲目地把鲢、鳙鱼种放养量增大到每亩2000余尾,超过同类塘常规放养数的三倍多。尽管采取了养猪积粪和从环卫所购买人粪来培肥水质的措施,光肥料成本就花了二万多元,结果终因鱼种密度过大,鱼塘产量甚低,且鱼类个体大部分来达到商品规格,大的不过450～500克,小的只有150～200克,只能留作下年老口鱼种。1985年至1986年,池塘除老口鱼种外,又补充了相当数量的新鱼种,该池塘亩放鲢、鳙鱼种仍超过2000尾,最多亩放高达3500余尾,放养鱼种年龄普遍偏大,且一龄鱼种较少,三龄鱼种
Since 1984, due to the failure of science, in order to raise the output of fish and irrespective of the conditions of fish ponds, the comprehensive fishing grounds of the Great Wall Township in the suburbs of Xiangtan City blindly increased the stocking of silver carp and bighead carp to more than 2,000 tails per mu, Three times more than the normal stocking of similar ponds. Despite measures taken to raise pig manure and human waste from sanitation clinics to cultivate fertilizers, the cost of light fertilizers has cost more than 20,000 yuan. As a result, the density of fish species is too large and the yield of fish ponds is very low. Fish Most individuals to achieve product specifications, large, but 450 to 500 grams, a small only 150 to 200 grams, can only be reserved for the next year the old mouth fish species. From 1985 to 1986, in addition to the old mouth fish species, the pond supplemented a considerable number of new species of fish, and the pond covered silver carp and the number of mullet species still exceeded 2000. The maximum mu up to more than 3500 tails and the stocking age Generally larger, and less age fish, three species of fish