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~Laboratory of Aquaculture ~

Hiroshima University, Japan. 

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updated on 11/26/2002

Research 

    The preliminary title of my Ph.D. project will be 'The effects of dietary EPA and DHA on adipose tissue  development on black sea bream Acanthopagrus schlegeli'. The aim of this experiments is to studies the relationship (lipid metabolism)  between the physiology of fish larvae and the effects of dietary enrichments in order to enhancements the fish quality of hatchery-reared produced.  

     In aquaculture a constant need exists for the improvement of rearing conditions of commercially grown fish like Black sea bream (Acanthopagrus schlegeli'). A bottleneck in rearing fish larvae in captivity are the sensitive stages of early development and metamorphosis. Recent experiments have shown that the modification of the specific first feeding diets can improve the quality of fish larvae and strongly decrease mortality. The enrichment of the larval diets with natural additives like vitamins and fatty acids are clearly beneficial for early development. There are strong indications of a functional relationship (lipid metabolism) between fatty acids  in the diet and hormonal regulation in (early) fish larvae. In co-operation with the Hiroshima City Marine Products Promotion Association, Shoko Center, Hiroshima,  Japan  I focusing on the direct mode of action of one of those additives, the fatty acids. Goal of this co-operation is to clarify the effect of two essential fatty acids, ecosahexaenoic acid and docosahexaenoic acid, and certain micronutrient like chitin might effect on appearance of lipid storage and the stress response. 

   The facilities of the Hiroshima City Marine Products Promotion Association, Shoko Center, Hiroshima,  Japan  enable large scale experiments under realistic aquaculture conditions in close co-operation with a fish feed producing company and a local hatchery.

Used techniques

• Feeding experiment of Black seabream juvenile.
• Determination of biometric parameter and morphological measurement.
• Determination and quantification of fatty acids and lipid class.
• Determination of lipolysis activity.

Associations

Supervisor by: Prof. Heisuke Nakagawa 

Pictures

• This year experiment  at Hiroshima City Marine Products Promotion Association.
• View of experimental tanks