论文部分内容阅读
1986—1989年的鱼种池塘越冬对比饲养与室内验证试验结果表明:长江以南草鱼种在冬季大部分时间仍能开口摄食。若不是密集越冬,并在晴天加强培育,越冬期间鱼种的平均生长率可达10—14％,鱼体丰满系数、血液中红细胞数、血红蛋白、血浆总蛋白含量,肌肉、肝脏中大部分营养成分较越冬前均无明显变化(p>0.05);补充投饵的半密集越冬组,鱼种体重、丰满系数能维持在越冬前水平(p>0.05),但血液、肌肉、肝脏中部分营养指标仍明显下降(p≤0.05);而饥饿条件下密集越冬组,鱼种消瘦9—14％,腹内肠系膜脂肪消耗殆尽,丰满系数、肝脏、肌肉中蛋白质、脂肪含量均明显下降(p≤0.05),且出现贫血状态。试验证明了越冬鱼种放养密度及饲养管理的不同,将影响鱼种质量的优劣和次年的成鱼养殖产量。为我国长江中下游大部,淮河、黄河中下游部分地区改革鱼种越冬制度,采取稀放精养的必要性和提高越冬鱼种质量与产量的可行性提供了理论根据。
Comparison of winter reared breeding and indoor verification tests of fish ponds from 1986 to 1989 showed that grass carp species remained south of the Yangtze River for most of winter. If not intensive winter, and strengthen the cultivation in sunny days, the average growth rate of fish during winter over up to 10-14%, plump coefficient of fish, red blood cells in the blood, hemoglobin, plasma total protein content, most of muscle and liver nutrition (P> 0.05). The semi-dense overwintering group fed with bait could maintain the body weight and fullness coefficient before winter (p> 0.05), but some nutrition in blood, muscle and liver (P≤0.05), while in the overwintering group under starvation conditions, the fish species were 9-14% thinner, the abdominal mesangial fat was depleted, the plumpness coefficient, protein and fat content in liver and muscle were significantly decreased (p ≤ 0.05), and anemia. The experiment proved that the difference of stocking density and management of overwintering species will affect the quality of fish species and the production of fish farming in the following year. This provided the theoretical basis for reforming the overwintering species of fish species in most areas in the middle and lower reaches of the Yangtze River, the Huaihe River and the middle and lower reaches of the Yellow River, taking the necessity of dilution and intensive farming and improving the quality and yield of overwintering species.