Toshi's work

The strategy of f infish culture founding in Chile (Revised version of April 28, 2012) Masatoshi FUTAGAWA August 9, 2017 Exportation of salmons and trout reduced to 513 thousand tons (-13%) and 3.8 billion USD (+8%) in 2016 compare to 2015 due to influence of toxic algae bloom.  Also, natural resource of coastal fishes are decreasing much due to overfishing, and affect costal life which happening in all over the world. Thus, it needs alternatives culture species of salmons to minimize risk of the business and recover resource of costal fishes to improve costal life. The keywords are “Economical sustainability”, “Minimum influence for nature” and “Less energy consumption”. 1.     Conditions 1.1. Fish characters Ideal habits for commercial culture are bellow. ·          Easy to produce juvenile ·          Grow fast; grow to marketable size in a minimum time · ...

Sinking death syndrome during finfish larviculture Masatoshi FUTAGAWA / CORDUNAP June 30, 2012 Phenomenon Sinking death syndrome occur during early life stage of finfish larviculture, 3 to 7 days post hatch-out (DPH), that larvae settle on bottom at nighttime mostly and it makes mass mortality due to bacteria contamination and anoxia. Several species has the syndrome and that is one of the bottlenecks of mass production. I had the syndrome during the larviculture of Graus nigra , Pacific beakfish ( Oplegnathus insignis ), Japanese flounder ( Paralichthys olivaceus ) and Grater amberjack ( Seriola dumerili ). Causes Increasing body density Finfish larvae consume yolk and oil droplet few days after hatch-out and change body density. Usually, body density of larvae is heavier than water (1.0236±0.0001 at WT 25 ̊C). According to Teruya et al. 2008 , Greater amberjack larva shows it consume yolk and oil droplet until 4 DPH and body water contents reduce from 2 DPH (93.5...