| Summary: | 碩士 === 高雄醫學大學 === 生物醫學暨環境生物學研究所 === 101 === Sustainable utilization is an important goal for fisheries management. In this study, we took harvesting situation in Taijiang Nation Park as an example. We investigated the captures, harvesting effort, density, population reproductive cycles and genetic diversity of C. sinensis during 2011-2012 in Taijiang National Park for resource conservation and sustainable utilization. The result showed that the average total weight was 5.15±3.48 kg per day. And average number of harvester was 10.6±11.0 person per day. The weight of total catch significantly correlated with the number of harvesters. Harvesters mainly collected C. sinensis, targeting sexually mature individuals of C. sinensis with size over than 2.4cm. The results of reproductive cycle analyses and Paraffin tissue section indicated that C. sinensis bred from September to October. The result of genetic diversity of C. sinensis demonstrated that 15 haplotypes were observed in Taiwan. And the genetic diversities were low in Taijiang. In conclusion, clam harvesters in Taijiang mainly collected C. sinensis. The total weight would increase as the number of harvesters. The harvesting was restricted to tides and weather. clam harvesters have been affecting the population of C. sinensis in Taijiang. The number of large size individuals is decreasing and the genetic diversity becomes very low now. Therefore, future management should emphasize on regulating the number of harvesters and total catch in the breeding season of C. sinensis.
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