World Aquaculture Society Meetings

DIETARY SUBSTITUTION EFFECTS OF FISH MEAL WITH THE COMBINED MICROALAGE, Nannochloropsis oceanica (NO) BIOMASS RESIDUE AND CASEIN ON GROWTH AND BODY COMPOSITION OF JUVENILE ABALONE (Haliotis discus)

Dong Gyu Choi*, Hee Sung Kim, Ki Wook Lee,
Sung Hyo Myung,  and Sung Hwoan ChoDivision of Marine BioScience, College of Ocean Science and Technology, Korea Maritime and Ocean University, Busan 606-791, Korea
E-mail: skychoilov@naver.com

Dietary substitution effects of fish meal with the combined microalgae, Nannochloropsis oceanica (NO) biomass residue and casein on growth performance and carcass composition of juvenile abalone was determined. One thousand two hundred and sixty juvenile abalone were randomly distributed into the 18, 70 L plastic rectangular containers. Five experimental diets were prepared in triplicate. The 28% fishmeal was included into the control (Con) diet. The 25, 50, 75 and 100% fish meal were substituted with the combination of graded levels of dry NO biomass residue and casein, referred to as the NO25, NO50, NO75 and NO100 diets, respectively. Finally, the sea tangle (ST), Laminaria japonica was prepared to compare effects of the experimental diets on performance of abalone.

The essential amino acids, such as isoleucine, leucine, phenylalanine, threonine and valine tended to increase with dietary substitution of fish meal with NO biomass residue in the experimental diets. Arginine tended to decrease with dietary substitution of fishmeal with NO biomass residue. Survival of abalone fed the experimental diets was higher than that of abalone fed the ST diet (Table 1). Weight gain and specific growth rate (SGR) of abalone fed the NO100 diet were higher than those of abalone fed the all other diets. Weight gain and SGR of abalone linearly increased with dietary substation of fish meal with NO. The chemical composition of the soft body of abalone was different among treatments except for moisture content. In conclusion, fish meal in the diets for abalone could be completely replaced with the combined dry NO biomass residue and casein when the 28% fish meal was included.




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