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在日本由农家饲养鲤鱼,已有很长的历史。但作为商品性生产,仅始于150年前的长野、群马和山形等县。在六十年代初期以前,日本养殖鲤鱼,一般还是在普通的鱼池和稻田或灌溉池内进行养殖,故发展较慢,产量很不稳定。目前,日本的鲤鱼成鱼养殖,即从1龄鱼养成至商品规格,采用四种不同的养殖方法,现分别介绍如下: 一、静水鱼池养殖是日本传统的养鲤法,采用900—3000平方米的土建池,每当春季,放养规格为80—120克的大鱼种,放养密度为0.5—1尾/平方米。单位面积产量很低,每平方米仅为500—800克。但如有微流水供给,其产量可增至1公斤/平方米(养
There have been a long history of carp raising in Japan by farmers. But as a commercial production, only began in 150 prefectures such as Nagano, Gunma and Yamagata. Before the early 1960s, carp farming in Japan was generally carried out in ordinary fish ponds and paddy fields or irrigation ponds, so the development was slow and the yield was very unstable. At present, Japan’s carp adult fish farming, that is, from the first-age fish raised to commodity specifications, the use of four different farming methods are as follows: First, the hydrostatic pond culture is Japan’s traditional carp method, the use of 900-3000 Square meter of the building pool, whenever the spring stocking specifications for large species of 80-120 grams, stocking density of 0.5-1 tail / square meter. Yield per unit area is very low, only 500-800 grams per square meter. However, if microfluidic supply is available, its output can be increased to 1 kg / m 2