Toshi's work

I worked in Ecuador under JICA http://www.jica.go.jp/ project from 1993 to 1997. I transfered technology of broodstock collection, seed production and juvenile rearing about flounder ( Paralichthis woolmani ) and white snook ( Centropomus viridis ). Maturation control by water temperature is one of the most useful technique that supply seed on demand, synchronize to rotifer production and reduce cost. The system consist broodstock tank (17.5 ton, 0.9 m depth) , egg collection tank, filter tank, heat pump and UV, and rearing water recirculate by pump. Flounder (Biomass 47Kg, 8 males and 11 females) spawned 165 million egg naturally from June 1995 to May 1997. The spawning was abundant between 18 to 20 C. I use same method in Malawi with carps, Barbus litamba “Thamba”, Labeo cyrinduricus “Ningwi” and Clarias gariepinus “Mlamba” are mature at water temperature 27 to 29 ℃ . Thamba and Ningwi spawn egg after hormone injection and produce some hatch-out fry. １９９３年から１９９７年に南米のエクアド...

I worked in Ecuador as JICA ( Japan International Cooperation Agency http://www.jica.go.jp/ ) expert in CENAIM (Centro Nacional de Acuicultura e Investigaciones Marinas "Edgar Arellano M." http://www.cenaim.espol.edu.ec/ ) from 1993 to 1997. The jobs were technical transfer of marine fish seed production, particularly broodstock collection, maturation inducement, seed production and juvenile rearing of snook and flounder. The part of broodstock collection is one of the most important and exciting job, because premium broodstock promise to produce excellent seeds. We used to buy the fish from fisherman directory by cash during fishing. Once we pay, the cost was non refundable even if we found some defect of the fish later. Thus, broodstock purchaser require the abilities which evaluate fish quality in an instance under chaotic fishing condition. The conditions of broodstock are as follows. · The fish is matured or the size is able to mature · Less ...

I worked in Ecuador as JICA ( Japan International Cooperation Agency http://www.jica.go.jp/ ) expert in CENAIM (Centro Nacional de Acuicultura e Investigaciones Marinas "Edgar Arellano M." http://www.cenaim.espol.edu.ec/ ) from 1993 to 1997. The jobs were technical transfer of marine fish seed production, particularly broodstock collection, maturation inducement, seed production and juvenile rearing of snook and flounder. Fine flounder ( Paralichthys woolmani "Lenguado") is one of very popular fish in Ecuador . The fish were fished by gill-net at off-shore where 30 to 50 m depth during winter season, June to September. Water temperature showed 21 to 25C at surface during collection season. The nets, more or less 10 cm mesh and 200 m long, were set in the afternoon and raise in the following morning. We followed the fisherman in the morning and purchased fish which was ideal for brood stock. The conditions for brood stock are the same as robalo. Especially, d...