【摘要】 <正> 由于社会需求量的增加,世界虾类产量增长较快,1975年已近126万吨,10年间增加了56万吨。但是世界海洋的自然资源和生产能力都是有限的,要进一步增加产量,必须大力开展养殖。因此,世界上已有46个国家和地更多还原

【Abstract】 This paper presents the results of research carried out in 1980 on the rear- ing of shrimp fry. The larvae are reared in large concrete tanks （two tanks of 50 m³ and one tank of 100 m³）. The water conditions are temperature: 16.5--25.1℃, PH value: 7.72--8.36, salinity: 29.23--31.76%, dissolved oxygen: 3.56--6.02ml/L, total NH₄-N: 18 -965 mg/m³. Daily renewal ratio of the water is between 10-50% for the zoea stage and mysis stage, 50-75% for (the postlarva. Unicellular algae or soybean particle are fed during the zoea stage, whereas rotifer, eggs and trochophores of oyster, nauplii of brine shrimp and minced cl- am meat for the mysis stage and postlarva. Production of 6, 815, 000 fry （Average body length being 0.62-1.27cm） have been obtained in three ranks. The best productivity of 68, 400 fry/m³ was obtained with 41% survival form zoea I.更多还原