碩士 / 國立嘉義大學 / 生物資源學系研究所 / 100 / Hard clam (Meretrix lusoria）is the most important molluscan cultured in the land based ponds in Taiwan. The industry has been conducted long, but no report found that studies how the growth of the clam influenced by the conditions of the pond. Condition index (CI) and shell width were used as observations in this study, because the former can be a good indicator of growth and the latter traditionally used to grade harvested clams for marketing. Chang-hua and Tai-nan are two important farming areas of hard clam. They quite differ with climate, freshwater resource and earth constitution, that contribute to local strategies of farming , so data collected from the areas being compared for the study. The surverys were carried out in July and November 2010. The culturing densities ranged from 150 to 200 clams / m2 and clams / m2 in Changhua and Tainan respectively. Most of clams of Tainan had better condition than those of Changhua. In the heat season, higher condition contributed to low culturing density. In the cold season, difference of fatness of the clams between two areas wae smaller than that of hot season, clams of Changhua should be benefit from low salinity of water. The ponds that producing fatter clams had low concentration of phosphate and lower pH. In July, the clams of Tainan had higher ratio of shell width vs body weight than that of Changhua. In November, morphological difference between the clams of two areas were not significant. It concluded that density had a major influence on the quality of the cultured clams. PCA.showed that quality of substrate impacted the clams more than that of water.
| Identifer | oai:union.ndltd.org:TW/100NCYU5404051 |
| Creators | Yuan-Ru Wang, 王苑茹 |
| Contributors | Koa-Jen Jong Ph.D, 鍾國仁 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 97 |
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