Journal of Aquaculture Research & Development

Development of eco-feed for red sea bream, Pagrus major: Replacement of expensive fish meal by low cost fish meal and soy protein

International Conference on Aquaculture & Fisheries

July 20-22, 2015 Brisbane, Australia

Amal Biswas, Ayumi Kato, Haruka Hashimoto, Yasuaki Hayashi, Kiyotomo Narita, Shuki Iwamoto and Kenji Takii

Posters-Accepted Abstracts: J Aquac Res Development

Abstract:

A lot of efforts have been given to search alternative of fish meal (FM) as protein source due to the high price and less availability of FM. Although soy protein (SP) has been considered one of the most promising alternatives due to relatively high protein content and fair amino acids balance, its utility in marine fish is lower compared to freshwater fish. As a result, a greater portion of expensive FM still need to be included in marine fish feed, which has been reduced the profitability as well as affect the sustainability. This study is aimed to replace all expensive FM by the combination of SP and cheaper residue FM (RFM) made from the fish market?s by-products. Three isoenergetic feeds were formulated: FM 20.4% + SP 47.6% (D1, control), and expensive FM in D1 was replaced by two types of RFM (D2 and D3). Phytase was included in all feeds at 1,000 units/kg diet. Twenty five red sea bream juveniles of mean weight 38g were stocked into each of nine 500 L tanks, fed the feeds until apparent satiation two times a day for 8 weeks. There were no significant differences in growth parameters and retention efficiencies of nutrients and energy in fish fed RFM diets compared to the control group (P>0.05). Moreover, the lack of difference in plasma constituents among the treatments indicates that the RFM didn?t have bad effect on physiology. The results suggested that cheap RFM can replace the expensive FM from red sea bream diet without compromising growth. It will help the aquaculture industry to reduce dietary cost as well as contribute to the sustainability.