alexa Growth Performance, Fillet Quality, and Reproductive Maturity of Rainbow Trout (Oncorhynchus mykiss) Cultured to 5 Kilograms within Freshwater Recirculating Systems | Abstract
ISSN: 2155-9546

Journal of Aquaculture Research & Development
Open Access

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Research Article

Growth Performance, Fillet Quality, and Reproductive Maturity of Rainbow Trout (Oncorhynchus mykiss) Cultured to 5 Kilograms within Freshwater Recirculating Systems

Davidson JW1, Kenney PB2, Manor M2, Good CM1, Weber GM3, Aussanasuwannakul A4, Turk PJ5, Welsh C1 and Summerfelt ST1*

1 The Conservation Fund’s Freshwater Institute, 1098 Turner Road, Shepherdstown, WV 25443, USA

2 West Virginia University, Division of Animal and Nutritional Sciences, P.O. Box 6108, Morgantown, WV 26506-6108, USA

3 USDA Agricultural Research Service, National Center for Cool and Cold Water Aquaculture, 11861 Leetown Road, Kearneysville, WV, 25430, USA

4 Institute of Food Research and Product Development, Kasetsart University, Bangkok 10900, Thailand

5 West Virginia University, Department of Statistics, P.O. Box 6108, Morgantown, WV 26506-6108, USA

*Corresponding Author:
Steven Summerfelt
The Conservation Fund’s Freshwater Institute, USA
Tel: 304-876-2815, ext. 211
Fax: 304-870-2208
E-mail: [email protected]

Received Date: April 17, 2014; Accepted Date: June 11, 2014; Published Date: June 28, 2014

Citation: Davidson JW, Kenney PB, Manor M, Good CM, Weber GM, et al. (2014) Growth Performance, Fillet Quality, and Reproductive Maturity of Rainbow Trout (Oncorhynchus mykiss) Cultured to 5 Kilograms within Freshwater Recirculating Systems. J Aquac Res Development 5:238 doi:10.4172/2155-9546.1000238

Copyright: © 2014 Davidson JW, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided theoriginal author and source are credited.

Abstract

Rainbow trout are commonly cultured within aquaculture systems to one pound or less and marketed as pan- sized fillets. Production of larger rainbow trout provides a distinguishable product. Research that describes the growth performance and fillet quality of large rainbow trout is limited, particularly for trout cultured in recirculating aquaculture systems. A study was conducted evaluating the growth performance and fillet quality attributes of all- female rainbow trout reared using freshwater recirculating systems operated at a mean water temperature of 13°C, under constant lighting, and with around-the-clock feeding. Rainbow trout grew to 4.8 kg in 22 months post-hatch. Growth rates declined with the onset of reproductive maturity. Rainbow trout weighed 5.2 kg at 26 months. The mean ratio of feed provided to biomass gain was 1.36:1 from first feeding to 22 months but increased substantially from 23-25 months. As rainbow trout approached reproductive maturity, 10 fish were collected at specified intervals for assessment of fillet quality attributes. Fillet yield peaked at 20-22 months when trout were 3.8-4.8 kg. Cook yield, cooked fillet firmness, and crude fat decreased; while fillet moisture and raw fillet firmness increased from 24-26 months. Changes in fillet quality coincided with reduced growth rates, decreased feed efficiency, and increasing gonadosomatic index. Two principal components were identified that explained more than 73% of the variation in growth and fillet attribute responses: principal component 1, the growth variable (length, weight, fillet thickness, belly flap thickness, and cook yield) and principal component 2, the quality variable (fillet moisture, fillet fat, and cooked fillet firmness). This research provides rainbow trout growth performance and fillet quality results that can be referenced for the development of recirculating system production plans and for selection of harvest endpoints that balance the requirements of fish farmers and the food industry sector .

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