Authors: Haruhisa Fukada Noriyuki Takahashi Noriko Hosomi Toshiro Masumoto
Publish Date: 2015/11/17
Volume: 18, Issue: 2, Pages: 231-238
Abstract
During tuna processing for human consumption the fish are initially boiled in water creating ~7000 tons of wastewater a year in Tosashimizu City Japan The wastewater tuna broth TB is rich in free amino acids and peptides therefore we investigated two methods of utilizing it beneficially In experiment 1 crude TB was used as a growth enhancer for two farmed species juvenile yellowtail Seriola quinqueradiata and red sea bream Pagrus major Juveniles of both species fed commercial extruded pellets mixed with 300 mL TB showed significantly better growth than the unsupplemented control group In experiment 2 concentrated TB was used as a dietary ingredient for juvenile yellowtail to improve palatability and growth Dietary preferences and growth were rated as follows fish meal diet soy protein concentrate SPC + TB diet SPC + krill meal diet SPC diet The beneficial effects of TB as a dietary supplement were evident Crude TB enhanced juvenile growth at minimal cost Concentrated TB requires processing with associated costs however it proved to be a valuable fishfeed supplement because of its high palatability and growthpromoting effect The utilization of TB also contributes to reducing the environmental impact of fish wastewater
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