论文部分内容阅读
1991年的特大洪涝灾害给我国部分地区的水产养殖生产造成了重大损失,大量鱼种外逃,不仅直接影响全年的养鱼产量,而且还波及来年的养鱼生产。因此,在鱼种缺口较大的地区,有必要采取家鱼早繁技术,争取在春季提早繁殖一批鱼苗,主要包括草鱼、鲢、鳙、鲤、鲫鱼等,其中鲢、鳙、鲤、鲫鱼采用早繁苗,可以做到当年上市,而草鱼主要利用早繁苗培育大规格鱼种(使一年达到常规二龄鱼种规格)。现将该项技术要点介绍如下: 一、亲鱼池的建造有条件的最好利用工厂废热水或地下温泉水培育亲鱼。但大多数地区不具备这一条件,可搭设简易塑料大棚鱼池,塑料大棚制成拱形,两边压紧埋入土中并压实,每个大棚面积300～500平方米,亲鱼池水深1～1.5米,长方形,进排水口相对,进水口设密网过滤,防止敌害进入。二、亲鱼放养塑料大棚鱼池在亲鱼放养前要用生石灰彻底清塘,然后每亩投放腐熟的粪肥200～300公斤作基肥,亲鱼要求在二月底前进入
The catastrophic floods of 1991 caused heavy losses in aquaculture production in some areas of our country and the flight of a large number of species not only directly affected the annual fish production but also affected the fish production in the coming year. Therefore, it is necessary to adopt the technique of early reproduction of domestic fish to breed a batch of fry early in the spring, including grass carp, silver carp, bighead carp, carp and crucian carp, among which silver carp, bighead carp, carp, crucian carp The use of early seedlings, you can do when the market, while the grass carp mainly use early breeding seedlings of large species (to achieve a year of conventional second-stage species specifications). Now introduce the technical points are as follows: First, the pro-fish pond construction The best conditions for the use of factory waste water or underground hot spring water to cultivate broodstock. However, most areas do not have this condition, can build simple plastic shed fish ponds, plastic sheds made of arched, both sides pressed tightly buried in the soil and compacted, each shed area of 300 to 500 square meters, the pro-fish pond depth of 1 to 1.5 Meter, rectangular, relative to the inlet and outlet, inlet set dense network filtering, to prevent the enemy to enter. Second, the broodstock stocking plastic shed pond in the brood stocking before using clear lime to clear the pond, and then put the decomposed manure 200 ~ 300 kg per acre for basal, broodstock requirements before the end of February