| 摘要: |
| 选取同一种进口鳟鱼标准饲料, 设1.0%、2.0%、3.0%、4.0%和5.0%共5个投喂率水平, 在溶解氧为8.0—8.5mg/L、水温为(16±0.5)℃的流水条件下, 对初始体重为5.32—6.43g的细鳞鲑幼鱼进行为期35d的生长实验。结果表明, 随着投喂率的增加, 相对增重率(WGR)和特定生长率(SGR)先升高后降低, 4.0%处理组的这两项指标显著高于其它各处理组(P<0.05), 分别为289.82和3.89; 饲料转化率(FCE)则呈现逐渐降低趋势, 2.0%组的FCE最低, 5.0%组最高。随着投饲率的增加, 细鳞鲑幼鱼鱼体水分含量呈下降趋势; 灰分含量无规律性变化; 粗蛋白含量保持在相近水平(除1.0%处理组); 粗脂肪含量无规律性变化, 但3.0%组显著高于其它各处理组, 4.0%组鱼体粗脂肪含量最低。综合衡量WGR、SGR和FCE等指标, 认为细鳞鲑幼鱼(5—25g体重)在密度为300尾/m3、水温为(16±0.5)℃流水条件下, 最适宜的投饲率为3.0%—4.0%。 |
| 关键词: 细鳞鲑 投喂率 饲料转化率 生长 |
| DOI：10.11693/hyhz201302027027 |
| 分类号: |
| 基金项目:“十二五”农村领域国家科技计划, 2012BAD26B05 号; 国家科技支撑计划, 2012BAD25B10 号; 中央级公益性科研院所基本科研业务费专项, HSY201312 号 |
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| EFFECT OF FEEDING RATE ON GROWTH AND BODY COMPOSITION OF JUVENILE BRACHYMYSTAX LENOK |
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XU Ge-Feng1,2,3,4, LIU Yang1,2,3, LI Yong-Fa1,2,3, MOU Zhen-Bo1,2,3
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1.Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences;2.Key Opening Laboratory of Cold-Water Fish Germplasm Resource and Aquaculture & Enhancement, Heilongjiang Province;3.Key Opening Laboratory of Cold-Water Fish Enhancement Biology & Physiology;4.College of Animal Science and Technology, Northeast Agricultural University
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| Abstract: |
| A 35-days feeding experiment was conducted to investigate the effect of feeding rate on growth and body composition of Brachymystax lenok (Pallas) juvenile which fed a commercial salmon diet. The body weight of fish was from 5.32g to 6.43g which were fed at 5 different rates of 1.0%, 2.0%, 3.0%, 4.0% and 5.0% body weight/day. The water dissolved oxygen was 8.0—8.5mg/L and the water temperature was (16±0.5)℃. The results indicated that weight gain rate (WGR) and specific growth rate (SGR) firstly increased and then decreased with the increase of feeding rate (FR). The WGR and SGR of 4.0% group were 289.82 and 3.89, respectively, both of them were significantly higher than the other groups (P<0.05). Feed conversion efficiency (FCE) was in a gradually decreasing trend, the lowest one was the 2.0% group and the highest one was the 5.0% group. With the increase of FR, the moisture of fish was decreased, the ash of fish was irregular changed, and the protein of fish keep in similar level except 1.0% group. The fat of fish was also irregularly changed, however the 3.0% group was significantly higher than other groups and the lowest one was the 4.0% group. Based upon the WGR, SGR and FCE data, the optimal FR was 3.0%—4.0% for juvenile B. lenok (5—25g body weight) at the water temperature of (16±0.5)℃ in 300/m3 density. |
| Key words: Brachymystax lenok feeding rate feed coefficient ratio growth |
