Effects of dietary protein levels on growth performance and body composition of juvenile parrot fish, Oplegnathus fasciatus

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• 作者：Kang-Woong Kim ; Mohammad Moniruzzaman ; Kyoung-Duck Kim…
• 关键词：Optimum protein level ; Growth ; Hematology ; Broken ; line analysis ; Cages ; Parrot fish
• 刊名：International Aquatic Research
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：8
• 期：3
• 页码：239-245
• 全文大小：432 KB
• 刊物主题：Marine & Freshwater Sciences; Freshwater & Marine Ecology; Water, general; Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution; Ecotoxicology;
• 出版者：Springer-Verlag
• ISSN：2008-6970
• 卷排序：8

文摘

The present study was conducted to evaluate the effects of dietary protein levels on growth, biometrics, hematology and body composition in juvenile parrot fish Oplegnathus fasciatus. Fish averaging 7.1 ± 0.06 g (mean ± SD) was randomly distributed into 15 net cages (each size: 60 × 40 × 90 cm, W × L × H) as groups of 20 fish. Five isocaloric diets (16.7 kJ/g energy) were formulated to contain crude protein levels (CP) as 35 (CP₃₅), 40 (CP₄₀), 45 (CP₄₅), 50 (CP₅₀) and 60 % (CP₆₀) in the diets. Fish were fed one of the experimental diets at apparent satiation twice a day in triplicate groups. At the end of 8-week feeding trial, weight gain (WG) of fish fed with CP₅₀ and CP₆₀ diets were significantly higher than those of fish fed with CP₃₅, CP₄₀ and CP₄₅ diets. Fish fed with CP₄₅, CP₅₀ and CP₆₀ diets had higher feed efficiency (FE) and specific growth rate (SGR) than those of fish fed with CP₃₅ and CP₄₀ diets. Protein retention efficiency (PRE) decreased with increase of dietary protein levels among fish fed with the experimental diets. Whole-body crude protein and lipid contents increased with the dietary protein level up to CP₅₀ diet. In conclusion, analysis of variance (ANOVA) revealed that the optimum dietary protein level could be 50 % for maximum growth of juvenile parrot fish, while the broken-line analysis of WG suggested that the level could be 48.5 %, in a diet containing 16.7 kJ/g energy.