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코끼리조개 치패의 먹이섭식에 미치는 수온과 먹이생물의 영향
손새봄,김기태,남명모,이채성,임현정 한국패류학회 2018 The Korean Journal of Malacology Vol.34 No.4
This study was performed to determine the effect of marine algae and water temperature on dietary feeding of juvenile geoduck (Panopea japonica) There was a significant difference on daily feeding efficiency of geoduck depend on temperature. In particular, it was shown that an ingested algal concentration was higher at 10, 15, and 20℃ than 5 and 25℃ for 24 hours. Clearance rate and ingestion rate of geoduck was relatively high at 15℃, showing 30.19 ± 1.06 L/hr/g, 21.83 ± 2.04 × 105 cells/mL, respectively. When two marine algae, Isochrysis galbana and Tetraselmis suecica, were provided to geoduck, there were no significant differences on clearance rate (CR), absorption rate (AR), absorption efficiency (AE) (p > 0.05) However, filtration rate (FR) was high when feeding on T. suecica compare to I. galbana. In conclusion, this study suggests that feeding activity of geoduck is considered to be high at 15℃. In addition, both I. galbana and T. suecica are necessary for geoduck though there was no difference between feeding efficiencies except filtration rate.
임현정,황인준,한종철,최진,손새봄,윤주현,김행운,김범주 한국패류학회 2020 The Korean Journal of Malacology Vol.36 No.1
In the present study, we developed the upwelling system for the culturing of cultchless juvenile oyster and evaluated its effect in indoor and outdoor sites. Indoor upwelling system was made by using 1 L transparent plastic imhoff cone to move seawater from bottom to top. Outdoor upwelling system was designed to continuously upward water flow into inside the tank by discharging the seawater from the upper part of the tank to the central drainage pipe. Indoor culture periods were 2 weeks, and outdoor culture periods were 35 days. During the experiments, water temperature, salinity, dissolved oxygen and pH were suitable for oyster culture. We cultured 1-8 mm cultchless juvenile oysters in the upwelling and downwelling system for 2 weeks in indoor. As a result, smaller oysters showed higher specific growth rate, and the weight increase was faster in the upwelling system. Subsequently, 9-32 mm juvenile oysters were cultured outdoors in upwelling system and off-bottom net cage facility for 35 days. As a result, it was found that there was a significantly higher in the total weight increase in the upwelling system. These indicate that the upwelling system is effective for cultchless juvenile oysters because it expands the use of seawater layers to increase food intake opportunities.