| Summary: | 碩士 === 國立澎湖科技大學 === 水產資源與養殖研究所 === 102 === As an island county, algal resources are abundant in Penghu islands. However, the majority of algal productivity is based on wild harvesting seaweeds, Monostroma nitidum and Porphyra dentate in the winter. A small scale of aquaculture of P. dentate only occurs in Jiangmei area, but the productivity is remarkably affected by the weather condition . There are nine species of Caulerpa commonly found in Penghu; however, the studies of Caulerpa were focused on taxonomy, not aquaculture. In addition, epiphytic fauna in association with Caulerpa also increase the difficulties of algal farming and reduces the commercial value of Caulerpa. In this study, a market-valued species, C. lentillifera, was selected for aquaculture experiments under different treatments of temperature, salinity, and lighting resource. Methods of epibiotic fauna removal using fresh water, Gram’s Iodine, and acid solution were examined. The optimal culturing temperature for C. lentillifera was ranged in 30 ~ 32 ℃ (0.58 ± 0.21 % day-1). The optimal culturing salinity ranged in 33 ~ 36 psu (0.69 ± 0.52 % day-1). The optimal culturing light intensity ranged in 25 ~ 30 μ mol photon m-2s-1 (1.26 ± 0.16 % day-1). In Penghu, the most commond epiphytic fauna in association with Caulerpa are sea anemone, Aiptasia pulchella, isopod, Tylos minor, and amphipod, Orchestia platensis. The removal rates of A. pulchella, T. minor, and O. platensis on the algae immersed in fresh water for 60 minutes were 46.6 ± 3.2 %, 100 %, and 100 %, respectively. The removal rates of A. pulchella, T. minor, and O. platensis on the algae immersed in 1.5 % Gram’s Iodine solution for 120 minutes were 30.0 ± 10.0 %, 83.3 ± 15.3 %, and 63.3 ± 5.8 %, respectively. The removal rates of A. pulchella, T. minor, and O. platensis on the algae immersed in 10 % vinegar-seawater for 40 minutes were 77.1 ± 21.3 %, 100 %, and 100 %, respectively. The combination of the treatments applied to the algae is likely to maximize removal rate.
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