| 摘要: |
| 【目的】 研究L-肉碱强化卤虫对草鱼开口苗生长性能的影响，为草鱼开口苗培育技术的完善提供参考。【方法】 用0（对照），1，100，1 000 mg/L的L 肉碱强化卤虫无节幼体（Artemia sp．）12 h，投喂给草鱼(Ctenopharyngodon idella)开口苗，分别于7，14，21 d取样测定鱼苗的体长、体质量，21 d时取样测定生命力及鱼体RNA/DNA比率的变化。【结果】 1 mg/L L-肉碱强化卤虫处理组草鱼开口苗的体长、体质量、体长日增长率和特定生长率均显著高于其他3组（P＜0.05）；100 mg/L L-肉碱强化卤虫处理组开口苗的生命力较其他3组有升高趋势（P＞0.05）；100，1 000 mg/L L-肉碱强化卤虫处理组开口苗的RNA/DNA比率显著高于对照组（P＜0.05），1 mg/L L-肉碱强化卤虫处理组开口苗的RNA/DNA比率与对照组之间差异不显著（P＞0.05）。【结论】 以1 mg/L L-肉碱强化卤虫投喂草鱼开口苗，可明显提高草鱼开口苗的生长性能；过高质量浓度L 肉碱强化卤虫对草鱼开口苗生长没有影响，但能提高其体内的RNA/DNA比率。 |
| 关键词: L-肉碱 强化卤虫 草鱼 开口苗 生长性能 RNA/DNA比率 |
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| 基金项目:国家自然科学基金项目(30671621) |
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| Effects of L-carnitine enriched artemia on growth,vitality and RNA/DNA ratio in first feeding larvae of grass carp (Ctenopharyngodon idella) |
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| Abstract: |
| 【Objective】Effects of L-carnitine enriched artemia on growth,vitality and RNA/DNA ratio in the first feeding larvae of freshwater grass carp (Ctenopharyngodon idella) were studied to offer basis to improve the culturing technology of larvae.【Method】The newly hatched artemia nauplii,enriched with 4 levels (0,1,100,1 000 mg/L) of L-carnitine for 12 h,were used as starter food for rearing larvae.【Result】Results indicated that the growth of larvae was significantly (P＜0.05) improved by feeding 1 mg/L L-carnitine enriched nauplii;Vitality of larvae was improved by feeding 100 mg/L L-carnitine enriched nauplii,but statistics did not show significant differences (P＞0.05);There was significantly (P＜0.05) higher RNA/DNA ratio for larvae in 100 and 1 000 mg/L L-carnitine enriching groups than in the control,no significant differences (P＞0.05) were observed on RNA/DNA ratio for larvae between 1 mg/L L-carnitine enriching group and the control.Results suggest that growth performances and survival of freshwater larvae might be improved by L-carnitine supplementation.【Conclusion】Therefore,the 1 mg/L L-carnitine enriched nauplii could remarkably enhance the growth performance of the first feeding larvae of grass carp.The higher concentrate L-carnitine enriched nauplii could not affect the growth performance of the first feeding larvae of grass carp,but could increase RNA/DNA ratio. |
| Key words: L-carnitine enriched artemia grass carp(Ctenopharyngodon idella) first feeding larvae growth activity RNA/DNA ratio |
