海洋科学2017，Vol.41Issue(8)：32-39,8.DOI:10.11759//hykx20161118001
投喂频率对珍珠龙胆石斑鱼幼鱼生长及系统水质指标的影响
Effects of different feeding frequencies on the growth of juvenile♀Epinephelus fuscoguttatus × (♂)Epinephelus lanceolatus and on water quality index
摘要
Abstract
Effects of different feeding frequencies on the growth of juvenile pearl gentian grouper (♀Epinephelus fuscoguttatus×(♂)Epinephelus lanceolatus) (35.5 g ± 4.58 g) and on water quality index were studied in a breeding experiment using a self-made small-scale circulating water system. Fishes were divided into three groups with three replicates in each group; groups were fed 1, 2 and 4 times per day. Body weight of the fishes was meas-ured every 15 days, and water quality index was measured every day. The experimental period was 45 days and water temperature was 25°C ± 2°C. Results showed that weight gain and feeding conversion rates of juvenile fishes were significantly different under different feeding frequencies (P < 0.05). As feeding frequency increases, weight gain rate significantly increased (P < 0.05), and feed conversion rate showed a significant initial increase and then a decrease (P < 0.05). Specific growth rate showed increased, and the growth rate of the groups that were fed two and four times per day was significantly higher than that of the group that was fed once a day group, whereas there was no significant difference between the groups that were fed two and four times per day (P > 0.05). With the increased feeding time, weight gain, feeding conversion, and specific growth rates significantly decreased (P < 0.05). In the first 15 days, weight gain rate in the group that was fed four times per day was the highest with a value of 46.30％, which was 1.31 and 1.11 times higher than those of the groups that were fed once and two times per day, respec-tively. The feeding conversion rate was the highest in the group that was fed two times per day with a value of 158.95％, which was 1.30 and 1.13 times higher than those of the groups fed once and four times per day, respec-tively. There were no significant differences in the contents of ammonia and nitrite and the variation of pH value (P >0.05). Meanwhile, nitrate content increased, whereas pH value decreased with increased feeding frequency. Results of the present study suggest that the optimal feeding frequency of pearl spotted grouper juvenile fish was two times per day under the recirculating aquaculture system.关键词
珍珠龙胆石斑鱼(♀Epinephelusfuscoguttatus×♂Epinepheluslanceolatus)/投喂频率/生长/水质Key words
♀Epinephelus fuscoguttatus × ♂Epinephelus lanceolatus/feeding frequency/growth/water quality index分类
农业科技引用本文复制引用
朱晓芳,曹潇,巩建华,徐善良,郭春阳..投喂频率对珍珠龙胆石斑鱼幼鱼生长及系统水质指标的影响[J].海洋科学,2017,41(8):32-39,8.基金项目
国家海洋局 2013 年海洋经济创新区域示范项目(F01521145300) （F01521145300）
浙江省科技计划项目(2017C32015) [State Oceanic Administration Regional Symposium on Ma-rine Economic Innovation in 2013, No.F01521145300 （2017C32015）
Zhejiang Province Science and Technology Project, No. 2017C32015] （）
