论文部分内容阅读
1 大水面的蓄养据徐恭昭、郑澄伟等1987年的报道,山东蓬莱县附近5个水库1961年放进梭鱼苗1.2万多尾,至1964年以三层挂网从中捕出梭鱼2500多kg,平均约每放1尾梭鱼苗可获200多g商品鱼。河北省南大港水库1958年放入梭鱼苗387240尾,1959年库内梭鱼渔获量占1.04％,1960年上升到3.62％。天然水域放养的优点是充分利用水面,天然饵料充足。南大港水库2龄梭鱼体长达308.2mm、重400g,而海产2龄鱼只有212.78mm,重202g。但也有不利的一面,如防逃,敌害及怎样捕捞也是值得研究的问题。
According to 1987 reports by Xu Gong, Zheng Chengwei and other reports, Penglai County, Shandong Province, five reservoirs in 1961 into more than 12,000 shuttle barracuda to 1964 to three net hanging from the catch of more than 2,500 barracuda, On average, about one ginseng can reach more than 200 g of commercial fish. In 1958, the Nantang Reservoir in Hebei Province placed 387,240 tails of barbed fry. In 1959, the catch of barracuda was 1. 04% and increased to 3.62% in 1960. The advantages of natural water stocking is to make full use of the surface, natural enough food. The second-stage mullet of the Nantang Reservoir was 308.2mm long and weighs 400g, while the second-generation marine fish is only 212.78mm thick and weighs 202g. But there are also disadvantages, such as anti-fleeing, hostile aggression and how to catch fish are also worth studying.