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越南鱼(非洲鲫鱼),具有生长、繁殖快,疾病少,食性广,产量高和肉质好等优点,但不耐寒,在韶关地区每年入冬后长达5个月的时间,需要人工保种越冬,因此对发展越南鱼生产,带来很大困难;两种罗非鱼新品种(我们暂称为中红罗非鱼和黑罗非鱼),是1973年从国外引进的新品种,它们与越南鱼都是罗非鱼属的不同种类,生活习性大致相同,但体形比越南鱼大,经初步试养,中红罗非鱼体重可达1斤左右,黑罗非鱼体重可达7两左右。为了发展越南鱼生产和扩大新品种的养殖,1974年冬,我们在韶关地区畜牧水产局、科技局的指示和帮助下,选择乳源瑶族自治县车干水温泉进行了越南鱼和两种罗非鱼新品种的冬期繁殖试验,并进行了越南鱼与两种罗非鱼新品种之间的杂交试验,取得了初步成果,到今年五月共生产6朝以上的越南鱼苗62万7千521尾,杂交鱼苗约2万5千尾(分四个杂交组合),黑罗非鱼13万3千267尾,中红罗非鱼约700尾。我们繁殖出来的这些越南鱼苗于今年4至6月分批供应了韶关市和仁化、乐昌等兄弟县的需要,两个新品种的后代以及它们与越南鱼的杂交后代,于今年4月至6月初分塘放养于韶关环市公社的南乡、向阳、反帝三个大队,以及郁南县都成镇养殖场,定期进行生长测定和产量的比较。
Vietnam fish (African carp), with growth, rapid propagation, less disease, wide feeding, high yield and good quality meat, etc., but not cold, in Shaoguan each year after winter up to 5 months, the need for artificial preservation Overwintering, which made it very difficult for the development of Vietnamese fish production. Two new varieties of tilapia (we tentatively called red tilapia and black tilapia) were introduced from abroad in 1973 and they And Vietnamese fish are different types of tilapia, life habits are roughly the same, but the body shape is larger than the Vietnamese fish, the initial trial, the weight of red tilapia up to 1 kg, black tilapia weight up to 7 Two or so. In order to develop Vietnam fish production and expand the breeding of new varieties, in the winter of 1974, with the instruction and help of the Bureau of Animal Husbandry and Fishery of Shaoguan, with the help of the Bureau of Science and Technology, we selected Vietnamese dry fish and two types of Luo Fei Winter breeding test of new species of fish and hybridization test between Vietnamese fish and two new varieties of tilapia and achieved preliminary results. By May this year, a total of 627 thousand 521 Vietnamese fish fry with 6 or more fry will be produced About 25,000 hybrid fry (divided into four hybrid combinations), 133,667 black tilapia and about 700 red tilapia. From April to June this year, the Vietnamese fry we bred supplied the needs of brothers and counties such as Shaoguan City and Renhua and Lechang in batches. The descendants of the two new breeds and their crossbreeds with Vietnamese fish, At the beginning of June, the ponds were stocked in Nanxiang, the sunnyside, anti-imperialist brigades of Shaoguan City Commune, and the farms in Ducheng Town, Yunan County, to conduct regular comparison of growth determination and yield.