| Summary: | 碩士 === 國立臺灣海洋大學 === 環境生物與漁業科學學系 === 101 === Studied on the tissues Ca2+ level of Litopenaeus vannamei exposed to various Ca2+ concentrations (150, 250 and 350 mg/L) at salinity 34‰ after 0, 1, 2, 5, 7 and 10 days. And we recorded the variation of tissue Ca2+ and Pb2+ level at different Ca2+ concentrations (150, 250 and 350 mg/L) and Pb2+ concentration (control, 0.5 and 1 mg/L) after 5 days.
Tissue Ca2+ contents varied following the ambient Ca2+ concentrations and exposed time (p&;lt;0.05). Change level in tissues had three trends: (1) Calcium content increased to highest value and then would be not affected by exposing days, such as gill. (2) Calcium content increased with exposed days, such as hepatopancreas and hemolymph. (3) Calcium content increased to highest value and then decreased following exposed time, such as muscle, shell and pleopods. Molting stage delayed and mortality rate increased when waterborne Ca2+ level reduced.
When molting Litopenaeus vannamei exposed to various Ca2+ and Pb2+ concentrations. Pb2+ might reduce the tissue Ca2+ absorption decreasing. The calcium descent rate was highest in hepatopancreas. Gill had highest lead accumulation among tissues and muscle was the lowest lead accumulation of the tissues.
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