Optimum level of lipid in granulated microdiets for rockfish (Sebastes schlegeli) larvae

Kim, Hyeon Jong; Cho, Sung Hwoan; Leec, Jeong-Ho

doi:10.1016/j.aqrep.2022.101372

Cited by 1 publication

(2 citation statements)

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“…There is some inconsistency with regard to reporting of dietary lipid requirement of rockfish. Kim et al [ 11 ] reported rockfish larvae (10 days) required 17.3% lipid in microdiet containing 52.4%–52.9% protein to support their development. Aminikhoei et al [ 25 ] reported that 12% lipid in diets containing 52% protein was sufficient for the growth of rockfish (1.7 g).…”

Section: Discussionmentioning

confidence: 99%

“…Because of its economic and ecological importance, efforts have been made to improve the productivity of rockfish, including seed production, nutrition regulation, vaccine development, and so on. The recent research on nutritional regulation mainly focuses on dietary macronutrients requirements, especially protein (54.0%, [ 10 ]) and lipid (17.3%, [ 11 ]). In addition, an early study reported that the optimum protein and lipid levels for growth and feed utilization of rockfish fry were 50% and 15%, 45% and 19%, pointing to the obvious protein-sparing effect of lipid [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Dietary Protein and Lipid Levels in Practical Formulation on Growth, Feed Utilization, Body Composition, and Serum Biochemical Parameters of Growing Rockfish Sebastes schlegeli

Song

Huang³

et al. 2023

Aquaculture Nutrition

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A 3 × 2 factorial experiment (protein levels, 42%, 46%, 50%; lipid levels, 9%, 12%) with three replicates was conducted in a circulating water system to investigate the effects of dietary protein and lipid levels on growth, feed utilization, body composition, and serum biochemical parameters of growing rockfish Sebastes schlegeli (initial weight, 29.98 ± 0.10 g). After an 8 weeks feeding trial, growth performance in terms of final body weight, percent weight gain, and specific growth rate increased with the increase of dietary protein level when fish fed diets containing a consistent level of dietary lipid. The feed conversion rate and daily feed intake were significantly affected by dietary protein and lipid levels, and decreased as dietary protein level increased from 42% to 46% or dietary lipid level increased from 9% to 12% ( P < 0.05 ). Survival rate, viscerosomatic index, and hepatosomatic index were unaffected by dietary protein level ( P > 0.05 ), but significantly increased with the increase of dietary lipid level ( P < 0.05 ). On the contrary, condition factor was unaffected by dietary lipid level ( P > 0.05 ), but significantly increased with dietary protein level increasing up to 46% ( P < 0.05 ). The moisture contents of muscle and liver significantly decreased, but the whole-body crude lipid content, the crude protein and lipid contents of muscle increased as dietary protein or lipid level increased ( P < 0.05 ). The contents of isoleucine, leucine, histidine, glycine, alanine of muscle, as well as the proportions of C14 : 0, C20 : 1, and C22 : 1n-9 in total fatty acids were higher in fish fed diets containing 12% lipid than those fed 9% lipid ( P < 0.05 ), while C18 : 1n-9 and C18 : 2n-6 followed an opposite trend. The contents of phenylalanine, lysine, and tyrosine as well as the proportions of C18 : 0, C18 : 2n-6, C22 : 1n-9, and C22 : 6n-3 in total fatty acids decreased with the increase of dietary protein level ( P < 0.05 ). Serum cholesterol and low-density lipoproteins increased significantly with dietary protein or lipid levels increasing, but TG concentration was elevated significantly in fish fed diets containing 12% lipid. Considering the present results in terms of growth and feed utilization, the suitable protein and lipid levels in diet for growing rockfish were 46% and 12%, respectively.

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Section: Discussionmentioning

confidence: 99%