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草鱼是主要的池塘养殖鱼类,人工投喂的饵料主要为旱生草类(以下简称草类)。广东省珠江三角洲地区盛产塘鱼,由于河川密布,鱼塘集中,草类甚为缺乏,故解决草鱼饵料来源就成为发展塘鱼生产的突出问题。为了因地制宜,充分利用河川浅塘等荒芜水面种植水生植物,广辟饵料来源,1971和1972年,我们曾和南海县水产养殖场利用河涌种植凤眼兰,并在两口试验塘用凤眼兰投喂草鱼取得初步成效:一口试验塘平均亩产450.9斤,其中草鱼为91斤;另一口同时放养三龄大鲩的试验塘,平均亩产634.5斤,其中草鱼为220斤。但凤眼兰比草类的水分含量高,营养价值较低。为了分析比较草鱼对凤眼兰和草类的消化吸收情况,以便改进凤眼兰的发酵和投喂方法,提高其营养价值,我们于1974年6至10月,应用放射性同位素P~(32)标记凤眼兰和草类,观察草鱼对它们的消化吸收和在体内的代谢过程。
Grass carp is the main pond fish, artificially fed bait is mainly dry grass (hereinafter referred to as grass). Guangdong Province, the Pearl River Delta is rich in pond fish, due to dense river, fish ponds concentrated grass is very scarce, so the solution to the source of feed grass carp has become a prominent problem in the development of pond fish production. In order to adapt to local conditions, make full use of shallow water ponds and other barren water plant aquatic plants, to broaden the source of feed, 1971 and 1972, we had and Nanhai County aquaculture farms using watermelon planted in Hong Kong, and two test ponds with water hyacinth Grass carp fed initial success: a test pond average yield 450.9 kg, of which grass carp was 91 kg; the other at the same time stocking third-trimester test ponds, the average yield of 634.5 kg, of which grass carp was 220 kg. But the water hyacinth is higher than the grass, lower nutritional value. In order to analyze and compare the digestion and absorption of grass carp on water hyacinth and grass so as to improve the fermentation and feeding methods of water hyacinth and increase its nutritional value, we applied radioisotope P ~ (32) from June to October 1974, Mark the water hyacinth and grass, observing the grass carp digestion and absorption of them in the body and the metabolic process.