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Hydrolyzed tuna meat by-product supplement for juvenile red sea bream, Pagrus major, and its effect on growth, enzyme activity, plasma parameters, and apparent nutrient digestibility

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Date
2014
Author
Mamauag, Roger Edward
Ragaza, Janice Alano
Koshio, Shunsuke
Ishikawa, Manabu
Yokoyama, Saichiro
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Abstract
A growth experiment was conducted on juvenile red sea bream, Pagrus major to investigate the effect of the inclusion in fish diets, of tuna meat by-product hydrolysate which was processed through enzymatic hydrolysis using a commercially available enzyme, derived from Bacillus subtilis. Six experimental diets were formulated in the experiment. Three diets contained 50, 150 and 250 g/kg of TPM-H (tuna meat by-product hydrolysate), and two diets with the unprocessed TPM (tuna meat by-product) at an inclusion level of 50 and 250 g/kg. A control diet was formulated without any addition of the test ingredients. Treatment diets were fed ad libitum to juvenile fish with an initial average body weight of 0.81 ±0.13 g for 56 days. Results of the feeding trial suggest that the inclusion of TPM-H at 250 g/kg in fish diets improved body weight gain rate (3271.58%), feed intake (24.55 g/fish/56 days) and feed conversion efficiency (1.12) of the fish. Apparent nutrient digestibility of hydrolyzed tuna meat by-product improved compared to the unhydrolyzed ingredient. These results suggest that TPM processed as hydrolysates can be efficiently utilized by fish.
URI
http://hdl.handle.net/10862/2248
Suggested Citation
Mamauag, R. E., Ragaza, J. A., Koshio, S., Ishikawa, M., & Yokoyama, S. (2014). Hydrolyzed tuna meat by-product supplement for juvenile red sea bream, Pagrus major, and its effect on growth, enzyme activity, plasma parameters, and apparent nutrient digestibility. The Israeli Journal of Aquaculture-Bamidgeh, IJA_66.2014.1021, 9 pages
Subject
Tuna meat by-product; Hydrolysate; digestibility ASFA; Plasma blood parameters; Pagrus major
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