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Effects of different protein and carbohydrate levels on growth performance and feed utilisation of brook trout, Salvelinus fontinalis (Mitchill, 1814), at two temperatures

Citation

Amin, MN and Katersky Barnes, RS and Adams, LR, Effects of different protein and carbohydrate levels on growth performance and feed utilisation of brook trout, Salvelinus fontinalis (Mitchill, 1814), at two temperatures, Journal of Applied Ichthyology, 30, (2) pp. 340-349. ISSN 0175-8659 (2014) [Refereed Article]

Copyright Statement

Copyright 2014 Blackwell Verlag GmbH

DOI: doi:10.1111/jai.12396

Abstract

A 12-week feeding trial was conducted to determine the optimum dietary protein requirement of brook trout, Salvelinus fontinalis, at 15 and 19C. Twelve iso-energetic (22MJkg−1) and iso-lipidic (23%) diets (3658% protein at 2% increments) were prepared. Fish (29.453.25gfish−1) were fed 2% of body weight per day, divided into two equal rations. The specific growth rate (SGR, %day−1), feed efficiency ratio (FER), productive protein value (PPV), productive lipid value (PLV) and productive energy value (PEV), apparent digestibility of diet (ADDM) and protein (ADCP) were significantly higher at optimum temperature (15C). Increasing PPV with increasing dietary carbohydrate and with decreasing dietary protein content was due to the protein-sparing effect of carbohydrates. A piecewise regression (broken line) model between the SGR and digestible dietary protein level revealed that the digestible dietary protein requirement of brook trout was 44 and 40% at 15 and 19C, respectively. When PPV (digestible protein retention basis) was modelled with a broken line, the digestible protein requirement of brook trout was 39 and 35% at 15 and 19C, respectively. A reduction in dietary protein content balanced by increased gelatinised carbohydrate might be useful for improving the protein utilization efficiency for growth at 15 and 19C; however, the growth and feed efficiency was lower at the elevated temperature.

Item Details

Item Type:Refereed Article
Keywords:temperature, protein requirements, salmonid, trout, salvelinus fontinalis
Research Division:Agricultural and Veterinary Sciences
Research Group:Fisheries Sciences
Research Field:Aquaculture
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - Aquaculture
Objective Field:Fisheries - Aquaculture not elsewhere classified
Author:Amin, MN (Mr Md. Amin)
Author:Katersky Barnes, RS (Dr Robin Katersky Barnes)
Author:Adams, LR (Dr Louise Adams)
ID Code:88034
Year Published:2014
Web of Science® Times Cited:3
Deposited By:NC Marine Conservation and Resource Sustainability
Deposited On:2014-01-08
Last Modified:2015-03-12
Downloads:0

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