水生态学杂志2017，Vol.38Issue(5)：97-102,6.DOI:10.15928/j.1674-3075.2017.05.014
光照对细鳞裂腹鱼受精卵孵化率及仔鱼生长、摄食的影响
Effects of Light Intensity on the Hatching Rate of Fertilized Schizothorax chongi Eggs and on the Growth and Feeding of Larvae
摘要
Abstract
Schizothorax chongi, a cold water fish species naturally inhabiting the upper Yangtze and Jinsha River, Jialing River and Yalong River, has suffered quickly declining populations in recent years. Important factors in the decline include interruption of free flowing rivers and other changes in hydrological regime produced by damming. Secondary effects, such as light intensity and water depth in spawning grounds, also affect the survival of S. chon-gi. In this study, the effects of light intensity on the hatching rate of fertilized S. chongi eggs and on larval growth and feeding over the first 20 days were measured. Parental S. chongi were collected from the lower Yalong River and fertilized eggs were obtained by artificial insemination. The eggs were incubated under six illumination intensi-ties (1000-1200, 600-720, 300-360, 100-120, 10-12, 0 lx). The number and date of newly hatched S. chongi larvae were recorded for each illumination treatment. Newly hatched S. chongi larvae were randomly as-signed to one of five light intensity groups (4000-6000, 1400-1800, 400-600, 40-60, 0 lx), with 200 larvae per group. Every 2-3 days, S. chongi larvae in each light treatment were randomly selected for determina-tion of total length, feeding intensity and feeding rate. Experimental conditions were as follows:water temperature, 16. 0-18. 0℃;DO, 6. 8-8. 5mg/L and pH of 6. 5-6. 8. Illumination intensity had a significant effect on the hatching rate of S. chongi eggs (F=391. 51,P<0. 01). From 10 to 360 lx, hatching rate increased with intensi-ty, reaching the maximum value (88. 1 %) in the 300-360 lx group. The hatching rate declined slowly at illumi-nation intensities above 360 lx and the suitable light intensity for hatching S. chongi eggs is 300-720 lx. Light in-tensity also had a significant effect on the growth and feeding of S. chongi larvae during the first 20 days. After 9 days, S. chongi larvae in the 40-60 lx treatment group displayed the fastest growth and highest feeding intensity, followed by the 400-600 lx group. Above 600 lx, feeding intensity dropped significantly with the illumination in-tensity, especially in the 4000-6000 lx group. All larvae in the 0 lx group had died of starvation by day 15. Suitable light intensity for larvae growth and feeding ranges from 40 to 600 lx. These findings provide basic data for artificial reproduction and cultivation of S. chongi.关键词
细鳞裂腹鱼/光照强度/孵化率/生长/摄食Key words
Schizothorax chongi/illumination intensity/hatching rate/growth/feeding分类
农业科技引用本文复制引用
秦希获,刘国勇,邬玉娇,石小涛,王小玲..光照对细鳞裂腹鱼受精卵孵化率及仔鱼生长、摄食的影响[J].水生态学杂志,2017,38(5):97-102,6.基金项目
国家自然科学基金项目( 51179096) （ 51179096）
三峡库区生态环境教育部工程研究中心开放基金项目( KF2015-07). （ KF2015-07）
