사육수의 급격한 염분변화에 따른 숭어 ( Mugil cephalus ) 와 틸라피아 ( Oreochromis niloticus ) 의 생리적 반응 = Physiological Responses of Grey Mullet ( Mugil cephalus ) and Nile Tilapia ( Oreochromis niloticus ) by Rapid Changes in Salinity of Rearing Water

다국어 초록 (Multilingual Abstract)

Physiological responses (cortisol, glucose, GPT, GOT, total protein, hematocrit, sodium, chloride, potassium, total calcium and osmolality), growth and survival rates of grey mullet (Magil cephalus) and Nile tilapia (Oreochromis niloticas) by the manipulation of salinity were studied. Salinity was increased directly from freshwater to 33‰ and remained for 15 days. Then, salinity was decreased directly from seawater to freshwater and remained for other 15 days. All tilapias were dead at the third day, but 96.5% of grey mullet were survived at the 30th day. The grey mullet showed no significant differences for cortisol and glucose concentrations in the seawater and freshwater. However, those of the Nile tilapia were increased in seawater. The grey mullet showed no significant differences for sodium, chloride and potassium concentrations during experimental period. However, those of the Nile tilapia were significantly increased when exposed to seawater. The osmolality of grey mullet ranged between 293.5 mOsm/㎏ and 335.0 mOsm/㎏ for the whole experimental period.