soybean field

USSEC Follows Up on Jeju Roundtable Results

USSEC recently took measures to further pursue the results of last month’s roundtable in Jeju, Korea.  Follow-up focused on the mortality rate of flounder continuing to be as high as 50% over the feeding period spanning from fingerling to market size (1 kg), due mainly to diseases derived from germ-contaminated water discharged from in-land tanks and fish-based moist pellet (MP) feed.  In general, even though fish that were fed protein meal-based extruded pellet (EP) feed are known to have a lower mortality rate than those that are fed fish-based MP, target growers using EP had the same mortality rate as those using MP.  A consensus was reached that giving more EP than required is common because growers had become familiar with the larger amount of MP (4-5 kg per kg weight gain) that was formerly fed.  The overfeeding of EP then led to digestive disorders and diseases that caused poor growth or death.  USSEC plans to provide technical assistance using on-site visits with target growers to gain in-depth insight into the feeding practices in use.