사육수의 담수화시 수용밀도에 따른 넙치(Paralichthys olivaceus)의 생리적 반응 비교
Physiological Resposes of Olive Flounder (Paralichthys olivaceus) by Capacity Density Difference during Salinity Change from Seawater to Freshwater
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Abstract
- Two different groups (30 and 60 inds.) of olive flounder ( Paralichthysolivaceus ) were abruptly (within 30 min) exposed to hypo -salinities from seawater (SW,35‰) to freshwater (FW, 0 ‰) (30FW and 60FW) and to 35 ‰ (30SW and 60SW) in a flowthrough seawater culture systems. Analysis of plasma samples showed the followingsignificant increase at 0 ‰: cortisol from 2.8 ng mL-1 to 66.9 ng mL-1 (30FW) and from 2.7ngmL-1 to 314.1ngmL-1 (60FW) after 24 hours of exposure; glucose from 15.8mgdL-1 to257.7 mg dL-1 after 3 hours exposure and to 164.0 mg dL-1 after 24 hours in 60FW. Plas-ma Na± concentration of 30FW and 60FW were decreased until 24 hours after expose.However that in 30SW and 60SW showed no significant differences. Plasma Cl-concentration of 60FW was decreased from 59.0 mEq L-1 to 43.5 mEq L-1 and to 30.0mEq L-1 after 3 and 24 hours of exposure, respectively. At all experimental groups,survival were 100% until 24 hours.
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