6 research outputs found
Oxygen Consumption and Blood Physiology of Olive Flounder Paralichthys olivaceus Subjected to Salinity Changes
No full textOxygen consumption and blood physiology of olive flounder Paralichthys olivaceus (mean body weight 106.6±6.8 g, mean±SD) was investigated at salinities of 34.0 (control), 33.7, 33.3, 32.6, 31.3, 28.6, 23.1, 12.2 and 0.0 psu at 20.0°C, respectively. Stepwise salinity changes 34.0→33.7→33.3→32.6→31.3→28.6→23.1→12.2→0.0 psu) with an interval of 24 h for each salinity induced a significant (P<0.05) increase of oxygen consumption rate (OCR) in fish exposed from 31.3 to 0.0 psu compared to that of control fish. The maximum OCR was found in fish exposed to 23.1 psu, which was accompanied by 36.2% higher energy consumption than the control fish. Fish exposed to each salinity for 24 h induced a significant decrease of blood plasma Na+ in 0.0 psu and Cl- in 12.2 and 0.0 psu (P<0.05), and increase of plasma glutamic oxaloacetic transaminase (GOT) in 0.0 psu compared to the control fish (P<0.05). The results of this experiment show that P. olivaceus exposed to concentrations below 31.3 psu requires more energy costs to adapt to salinity changes than 34.0 psu under our experimental conditions.22Nkc
Water Temperature and Salinity Affect Oxygen Consumption in the Black Sea Bream Acanthopagrus schlegelii
No full textThe influence of water temperature (15, 20, and 25°C) and salinity (0, 15, and 30 psu) on the oxygen consumption rate (OCR) of black sea bream Acanthopagrus schlegelii (mean body weight = 203.1 g) was determined using a closed flow-through respirometer. The OCR was significantly affected by water temperature (P<0.001), salinity (P<0.001), and their interaction (P<0.05). With increasing water temperature (15–25°C), OCR exhibited a linearly increasing relationship expressed as OCR= -124.6890+13.1903T (r2=0.92, P<0.0001), OCR=-85.8624+12.2555T (r2=0.79, P<0.001), and OCR=-150.6132+20.3146T (r2=0.79, P<0.001) at 0, 15, and 30 psu, respectively. The OCR values significantly decreased with decreasing salinity at all experimental water temperatures. The range of Q10 values was 2.87–4.78, 1.32–2.15, and 2.48–2.89 between 15 and 20°C, 20 and 25°C, and 15 and 25°C, respectively. Metabolic energy expenditure was higher in response to increased water temperature (increase of 148.2–189.0%) increase than in response to increased salinity (increase of 70.5–98.7%). These results contribute to a quantitative understanding of the effects of water temperature and salinity on the metabolic costs to black sea bream and provide basic data for the bioenergetic analysis of adaptation to environmental changes under our experimental conditions.22Nkc
Salinity influences survival and metabolic rate of Halocynthia roretzi
No full text다른 염분 9개 조건[즉, 34.5(대조구), 34.2, 33.7, 31.7, 29.0, 23.5, 12.4 그리고 0.3 psu]에 따른 우렁쉥이(Halocynthia roretzi, 101.4±2.6 g)의 생존율과 대사율에 미치는 영향을 조사하였다. 생존율은 각 염분조건에서 120시간 동안 측정하였다. 산소소비율은 24시간 간격으로 단계적 염분 변화(34.5 → 34.2 → 33.7 → 31.7 → 29.0 → 23.5 → 12.4 → 0.3 psu) 조건에서 폐쇄 순환식 호흡률 측정 장치에서 조사하였다. 산소소비율은 각 염분 조건으로 변화시켜 충분히 적응시킨 후 염분 변화 직전 6시간 동안 10초 간격으로 측정하였다(단, 0.3 psu의 경우 염분 변경 후 폐사 직전까지만 측정). 염분 34.5∼29.0 psu 범위에서는 실험기간 동안 폐사율이 발생하지 않았지만, 23.5 psu와 12.4 psu 조건에서는 실험 1일 후에 각각 36.7%와 86.7%, 그리고 2일 후에는 각각 전량(100%) 폐사하였다. 염분 0.3 psu에서는 실험 1일 후에 전량 폐사하였다. 염분 변화에 따른 우렁쉥이의 평균 산소소비율의 경우 염분 34.5 psu에서 33.1 psu까지는 유의하게 증가하였다(P0.05), 그 이후의 염분(즉 29.0 ∼ 0.3 psu) 조건에서는 유의하게 감소하여 0.3 psu에서 가장 낮은 평균 산소소비율을 보였다(P<0.05). 이와 같은 연구 결과는 연안지역 우렁쉥이 양식장 내 여름철 호우 및 육상 기인에 의한 담수 유입에 따른 사육관리에 활용할 수 있을 것이다.2
