论文部分内容阅读
非洲鲫鱼（Tilapia mossambica）是一种优良的养殖鱼类,许多地区的生产实践证明,在水质较肥、饲料充足的条件下,它与四大家鱼合理混养,能有效地提高塘鱼单位面积的产量。例如1973年,清远县农业局养鱼组的160亩城郊鱼塘平均亩产1,103斤,其中非洲鲫鱼的产量占了53.5％;北京朝阳区太阳宫公社的一个10亩鱼塘,实行非洲鲫鱼与鲩、鲢混养,平均亩产达750斤,其中非洲鲫鱼产量也占30.6％。但由于非洲鲫鱼抗寒力差,需要冬季保种,广东大部分地区要到四月才能在普通鱼塘繁殖鱼苗,因此要提早放养就受到种苗的限制,韶关地区每年都要到六月中、下旬才能获得大量鱼苗在鱼塘放养,而到了十月后又因水温低而不得不全部捕清,全年放养时
Tilapia mossambica is a kind of excellent cultured fish. The production practice in many areas proves that it is reasonable to polyculture with the four major domestic fish under the conditions of more water and adequate feed, which can effectively improve the area of the pond fish Production. For example, in 1973, the average mu yield of 160 mu suburban fish ponds in the fish farming group of Qingyuan County Agricultural Bureau fish farming group was 1,103 kg, of which the production of African carp accounted for 53.5%. A 10 mu fish pond in Taiyanggong Commune, Chaoyang District, Beijing, Ju, silver carp polyculture, the average yield of 750 kg per mu, of which African carp also accounted for 30.6%. However, due to the poor cold hardiness of African crucian carp, it is necessary to preserve the species in winter. In most areas of Guangdong, it is not possible to breed fry in ordinary fish ponds until April. Therefore, the stocking is limited by early stocking, and Shaoguan area will reach mid-June every year , Late in order to obtain a large number of fish stocking in fish ponds, but in October due to low water temperatures and have to catch all the year-round stocking