The combined effects of feeding time and dietary lipid levels on growth performance in juvenile beluga sturgeon Huso huso

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• 作者：Morteza Najafi ; Bahram Falahatkar ; Ali Safarpour Amlashi…
• 关键词：Digestibility ; Energy ; Feeding behavior ; Hematology ; Lipid ; Sturgeon
• 刊名：Aquaculture International
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：25
• 期：1
• 页码：31-45
• 全文大小：
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Freshwater & Marine Ecology; Zoology;
• 出版者：Springer International Publishing
• ISSN：1573-143X
• 卷排序：25

文摘

Juvenile beluga sturgeon, Huso huso (initial weight 50 ± 0.2 g), were fed with two lipid levels (120 g kg−1 lipid as low-energy diet, LE; 240 g kg−1 lipid as high-energy diet, HE) at different feeding times for 8 weeks, and the effects on growth, hematology, muscle composition, and apparent digestibility coefficients of dry matter, lipid, and protein were examined. Feeding times were as follows: (1) at 09:00 and 16:00 (under light regime), (2) at 21:00 and 04:00 (under dark regime), and (3) at 13:00 and 20:00 (under light–dark regime). Dietary lipid levels did not affect the hematological indices or apparent digestibility coefficients of dietary nutrients (P > 0.05); however, they affected the growth and muscle composition (P < 0.05). The fish fed with HE diet had the highest final weight (174.2 – 175.9 g), specific growth rate (2.44 – 2.47 % day−1), weight gain (246.5 – 252.6 %), and the lowest feed conversion ratio (1.10 – 1.12). The fish fed with HE diet had the highest muscle lipid content (26.6 – 35.2 g kg−1). Unlike the lipid levels, feeding times did not significantly affect growth, hematological parameters, nutrient digestibility, and muscle composition (P > 0.05). Accordingly, juvenile beluga sturgeon can be fed at different times of the day without suffering growth loss, because probably, they have a low dependency on vision to detect food.