The storage stability of frozen muscle from sunshine bass, Morone chrysops × M. saxatilis, fed diets containing various levels of protein (29, 36, 42, and 45%) was determined by measuring thiobarbituric acid reactive substances (TBARS), an indicator of lipid oxidation, and changes in shear stress and tensile strength of the muscle during storage. Fish fed a 45% protein diet had a higher (P < 0.05) dressed yield than fish fed diets containing 29 and 36% protein. Percentages of moisture, protein, fat, and ash of fresh fillet were not different (P > 0.05) among all dietary treatments. The n-3 fatty acids composed one-third of thc total fatty acids in muscle, and the n-3/n-6 fatty acid ratio was lower in muscle of fish fed from the 29% protein diet (1.89) than those fed from the higher protein diets (2.70-3.40). Other fatty acids, however, were similar among all muscle samples. Storage at -20°C for 6 months did not cause significant (P > 0.05) increases in lipid oxidation for skin-on fillets, but from month 4 to month 6, skinless fillets exhibited marked increases (P < 0.05) in TBARS. Changes in TBARS were generally not affected by dietary protein levels. Shear stress and tensile stress of muscle tissue showed inconsistent changes during storage and no differences (P > 0.05) due to dietary regimen were observed. The results indicate that physical and chemical characteristics of hybrid striped bass muscle after 6 months of frozen storage were minimally influenced by dietary protein level.
|Number of pages||17|
|Journal||Journal of Applied Aquaculture|
|State||Published - Jun 12 1996|
Bibliographical noteFunding Information:
The authors would like to thank the Brown-Forman Company, Louis-villc, Kentucky for use of their facilities and donation of the sunshine bass. We also thank Steven Grider, Robert Howerton, Eddie Rednour, Bill Red- now, Peter Van Wyk, and Daniel Yancey for their technical assistance. This research was partially fhded from a USDA 1890 Institution Capacity Building Grant No. 93-38814-8734, a grant from the Southern Regional Aquacultural Center No. 92-38500-7 11 0 through USDA, and a grant from the USDAICSRS to Kentucky State University under agreement No. KYX-80-92-OSA.
ASJC Scopus subject areas
- Aquatic Science