Wednesday , 18 September 2019

JIRCAS scientist shares study on sandfish

Development Communication Section

(Left) JIRCAS scientist Dr. Satoshi Watanabe receives a Certificate of Appreciation from AQD’s research head Dr. Ma. Junemie Hazel Lebata-Ramos. (Right) Dr. Watanabe with wife Nahoko and sons Yuta and Koshi; Dr. Watanabe thanks AQD for “all the wonderful memories and the warm treatment” given to him and his family during their five-and-a-half years stay in the Philippines
(Left) JIRCAS scientist Dr. Satoshi Watanabe receives a Certificate of Appreciation from AQD’s research head Dr. Ma. Junemie Hazel Lebata-Ramos. (Right) Dr. Watanabe with wife Nahoko and sons Yuta and Koshi; Dr. Watanabe thanks AQD for “all the wonderful memories and the warm treatment” given to him and his family during their five-and-a-half years stay in the Philippines

AQD visiting scientist Dr. Satoshi Watanabe of JIRCAS (Japan International Research Center for Agricultural Sciences) presented a part of his study on IMTA (integrated multi-trophic aquaculture), titled the “Estimation of energy budget of sea cucumber, Holothuria scabra, in integrated multi-trophic aquaculture” on 11 March at AQD’s Tigbauan Main Station in Iloilo, Philippines.

IMTA is a polyculture technique that uses organisms from various trophic levels.  It can help prevent environmental deterioration associated with eutrophication since excess feeds and wastes from one aquatic species (e.g. fish) serves as food or source of nutrient to another species (e.g. sea cucumber, seaweeds).

Based upon the results of Dr. Watanabe’s experiments and information from literatures, the nutrient budget of sea cucumber (the sandfish H. scabra) cultured with milkfish (Chanos chanos) and seaweeds (Kappaphycus alvarezii) was calculated as a function of age. For example, the nitrogen requirement of a one-year old sandfish is 23.1 mg/day (or 334 mg/day milkfish feed) assuming that ingestion is 100% and digestibility is 80%. The nitrogen excretion of one-year old H. scabra is estimated to sustain the growth of 46 g K. alvarezii.

Dr. Watanabe prepares the Acoustic doppler current profiler for deployment at the IMTA set-up in AQD’s Igang Marine Station. He is instrumental in building two new facilities co-funded by JIRCAS and AQD: the IMTA experimental facility in 2012 (center) and the mini wet laboratory at Igang in 2013  (right)
Dr. Watanabe prepares the Acoustic doppler current profiler for deployment at the IMTA set-up in AQD’s Igang Marine Station. He is instrumental in building two new facilities co-funded by JIRCAS and AQD: the IMTA experimental facility in 2012 (center) and the mini wet laboratory at Igang in 2013 (right)

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