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1.自养鱼种鱼种的开支数额是比较大的,以亩投鱼种50公斤为例,需人民币300元。如果自己培育鱼种,这笔开支就可以减少。怎样培育鱼种?一是划出专业水面养鱼种;二是夏、秋季在成鱼中套养鱼种。2.科学搭配目前不少水域养殖品种单一,搭配不科学,水域资源没能充分利用,鱼产量不高,使成本加大。因而应按照鱼类的生物链,合理利用饲、肥,充分发挥水体生产潜力。如草、鲢鱼以草为主,处于食物链的第二级;鳙鱼以食浮游动物为主,处于食物链的第三级;鲤、鲫鱼以食底栖动物为主,处于食物链的第四级。上述鱼品种,又都能取食有机腐屑,直接利用第一级食物链。此外,还要适当混养青、鳊、鲂、罗非鱼等,有的水面还可以吊蚌育珠,水中养鱼,水底繁育幼蚌,有效地提高经济效益。3.种青养鱼种青是减少饲料开支的重要手段。怎样利用资源,抓住种青?一是浅水湖泊或鱼池,利用4～6月份鱼体小的特点,集中精养,腾出部分水域排浅水层种稻、稗作物;二是利用渠堤、湖堤、塘埂、堰边种植苏丹草、黑麦草、聚合草;三是在水面种植竹叶菜;四是利用废堤埂或调出部
1. The self-raised species of fish species costs are relatively large, with 50 kg per mu species of fish species, for 300 yuan. If you cultivate their own species, this expenditure can be reduced. How to breed fish? First, draw the professional aquaculture species; the second is the summer, autumn, adult fish in aquaculture. 2. Scientific collocation At present, many aquatic species breed a single, with unscientific, water resources can not make full use of fish production is not high, so that the cost increases. Therefore, fish should be in accordance with the biological chain, rational use of feed, fertilizer, give full play to the potential of water production. Grass, silver carp mainly grass, in the second level of the food chain; catfish to eat zooplankton mainly in the third level of the food chain; carp, crucian carp to zoobenthos mainly in the food chain of the fourth level . The above fish species, they are able to eat organic rot crumbs, the direct use of the first-class food chain. In addition, but also appropriate polyculture green, 鳊, 鲂, tilapia, etc., and some water can clam Zhu Yu Zhu, water fish, underwater breeding young mussels, effectively improve economic efficiency. 3 species of green fish cultivation is an important means of reducing feed costs. How to use resources to seize the green? First, shallow lakes or fish ponds, the use of small fish from April to June characteristics, focus on intensive training to release part of the water row of shallow water layer of rice, barnyard crops; the second is the use of dikes, Lake embankment, ponds, weir planting Sudan grass, ryegrass, polymerization grass; third is planted in the water bamboo leafy vegetables; Fourth, the use of waste embankment or transfer of the Department