Abstract
This study investigated the effect of damage reduction devices installed to reduce the mass mortality of farmed fish at high water temperatures period in marine net cage. The effect of rearing densities on fish mortalities in summer was also investigated. It was found that, dissolved oxygen and survival rate of Korean rockfish, Sebastes schlegeli in the experimental groups, i.e. the net cages equipped with liquefied oxygen and oxygen dissolver and with a lower rearing density were found to be higher than in the controls, i.e. net cages without the above devices and a higher density. According to the blood analysis results of the experimental fish, hemoglobin, hematocrit, glucose, glutamic oxalate transaminase (GOT) and glutamic pyruvate transaminase (GPT) in the fish of the control cage without damage reduction devices increased while the same blood parameters in the fish of the experimental group showed no significant difference from the initial values. Dissolved oxygen concentrations were found to be higher in the group with the combined use of both liquefied oxygen and oxygen dissolver than in the group with the single use of either device. It was concluded that the damage reduction devices and lower rearing densities were effective to raise dissolved oxygen concentrations in the high water temperature period.
Published Version
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