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【目的】考察中华沙鳅(Botia superciliaris)、宽体沙鳅(Botia reevesae)及两者杂交种幼鱼的生长特性。【方法】以各自1对亲鱼人工繁殖获得的60d龄中华沙鳅、宽体沙鳅和两者的杂交种幼鱼(中华沙鳅为母本,宽体沙鳅为父本)为研究对象,经15d人工饲料驯化后,进行为期210d的生长实验。实验结束后对三者的生长、饲料消化率和消化酶活性进行比较。【结果】中华沙鳅和宽体沙鳅的绝对生长率接近,并均比杂交种的绝对生长率高,且与后者相比均具有统计学意义上的差异(p<0.05);中华沙鳅的相对生长率、特定生长率最高,与其他两种鱼的这两项指标相比均具有统计学意义上的差异(p<0.05);宽体沙鳅的丰满度最高,且3种鱼丰满度的差异均具有统计学意义(p<0.05)。中华沙鳅的饲料总消化率最高,宽体沙鳅的次之,杂交种的最低,且杂交种与中华沙鳅间的这一指标差异具有统计学意义(p<0.05);三者的蛋白质消化率间没有统计学意义上的差异。中华沙鳅的淀粉酶、脂肪酶、胃蛋白酶和胰蛋白酶活性均为最高,与宽体沙鳅和杂交种的对应指标间的差异均具有统计学意义(p<0.05);与宽体沙鳅的淀粉酶和胰蛋白酶活性相比,杂交种的两种酶活性更高,且与前者的差异均具有统计学意义(p<0.05)。【结论】中华沙鳅比宽体沙鳅更偏肉食性,三者对人工配合饲料的利用率中华沙鳅最高,宽体沙鳅次之,杂交种最低。
【Objective】 The objective of this study was to investigate the growth characteristics of juvenile hybrids of Botia superciliaris, Botia reevesae and their hybrids. 【Method】 Sixty-day-old juvenile Chinese sand loach, broad-necked sandy loach and their hybrid crossbreed juvenile fish (S. huaxi as the female parent and C. angustifolia as the male parent) obtained from the artificial propagation of the broodstock were selected as the research object. After 15d artificial feed domestication, a 210d growth experiment. After the experiment, the growth, feed digestibility and digestive enzyme activity of the three were compared. 【Result】 The absolute growth rates of C. anguillarum and A. angustifolia were close and both were higher than that of hybrids, and there was a statistically significant difference (p <0.05) The relative growth rate and specific growth rate of Loach were the highest, which were statistically different from those of the other two species (p <0.05). The abundance of Loach was the highest and the abundance of three species of fish The differences were statistically significant (p <0.05). The total digestibility of feed was the highest, followed by the broad-leaved sandy loach, the lowest was the hybrids, and the difference between the hybrids and the Chinese loach was statistically significant (p <0.05). The three proteins There was no statistically significant difference in digestibility. The activities of amylase, lipase, pepsin and trypsin were the highest in C. angustifolia, with significant differences (P <0.05) Compared with the amylase and trypsin activity, the hybrids showed higher activity of the two enzymes, and the differences were statistically significant (p <0.05). 【Conclusion】 The Chinese loach is more carnivorous than the broad loach, and the utilization rate of artificial compound is the highest, the second is the broad loach, and the lowest is the hybrid.