Studi Sifat Fisiologi Ikan Gurami (Osphronemus gourami) Pada Suhu Rendah untuk Pengembangan Teknologi Transportasi Ikan Hidup

Abstract

This paper reports a study on the physiological characteristics of gouramy (Osphronemus gourami) during gradually reduced temperature for developing technology for live fish transporta- tion. The method used in the study was gradual reduction of water temperature at a rate of 5o C/ hour until no sign of life of gouramy could be observed. Observation was performed on physical activity and metabolism (respiration and metabolite production) of fish. The results showed that oxygen consumption and metabolism rate tended to decrease as water temperature decreased, especially after water temperature reached 23.6o C. At the early stage of reducing water tempera- ture, respiration slightly increased (from 168,0 to 177.6 mg O2 /kg of fish/hour) then decreased to the lowest point of 1.6 mg O2 /kg of fish/hour at 13.6o C. The pattern of metabolites production was similar to the rate of respiration, i.e. increased at the early stage of reducing water temperature (NH3 increased from 5.76 to 11.52 mg NH3 /kg of fish/hour, and NO2 increased from 0.16 to 0.66 mg NO2 /kg of fish/hour) and decreased as water temperature decreased (1.64 mg NH3 /kg of fish/hour and 0.16 mg NO2 /kg of fish/hour at 13.6o C).