Comparison of growth, carcass composition and fatty acid profile of Hediste diversicolor fed faeces and food of beluga (Huso huso) in open and semi-closed systems

Document Type : Research Paper

Authors

1 M.Sc. in Aquatic Animals Propagation and Rearing, Department of Fisheries, Talesh Branch, Islamic Azad University, Talesh, Iran.

2 Assistant Professor, Department of Fisheries, Talesh Branch, Islamic Azad University, Talesh, Iran

3 Assistant Professor, International Sturgeon Research Institute, Agricultural Research Education and Extension Organization (AREEO), Rasht, Iran

Abstract

In this study, growth, carcass composition and fatty acid profile were evaluated in Hediste diversicolor fed faeces and food of beluga in open and semi-closed systems. This research was carried out based on three treatments in three replicates consisting of treatment 1: Nereis worm fed by beluga wastewater and using recycling water (semi-closed), treatment 2: Nereis worm fed by beluga wastewater without recycling water (open) and treatment 3: Nereis worm fed by concentrated food. Results showed that growth indices and survival rate in worms fed by concentrated food were higher than in comparison with other treatments (P<0.05). The highest content of SPUFA and w-3/w-6 ratio were observed in Nereis worms fed concentrated food (P<0.05). Reared worms in semi-closed system had the maximum content of SMUFA and DHA/EPA ratio (P<0.05). Significant differences were recorded in protein and lipid of carcass and TSS contents of worm tanks outlet (P<0.05). According to the results, because of having high content of protein as well as suitable ratios of DHA/EPA and w-3/w-6, these worms have high nutritional value for sturgeons and shrimp broodstocks. Economically, because of the lack of expense on food, the worm can be exploited as secondary product.

Keywords

References

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Aquatic Physiology and Biotechnology
Volume 9, Issue 1
June 2021
Pages 19-38

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