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研究報告

更新日期: 2012-01-04
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臺西牡蠣苗生產區牡蠣苗附苗率提升之研究

年度 2006
計劃名稱 臺西牡蠣苗生產區牡蠣苗附苗率提升之研究
中文摘要 1. 水溫變化情形為1-3月穩定低溫(21.2-23.2 ℃),4月快速上升至約28.5 ℃,5-8月持續高溫(30-32 ℃),9月開始下降,至11與12月為約27-24.5 ℃。 2. 鹽度變化為1-3月維持於年度最高鹽度(35-36 ppt),4-9月低且變化大(28-33 ppt),10月上升至33-35 ppt。 3. 懸浮顆粒濃度變化為1-2月與10-12月受東北季風影響濃度較高,分別為25.6.3-38.5 與45.5-55.3 ppm,其餘月份為11.32-29.1 ppm。 4. 採苗器附著物重量變化為高水溫月份5-9月具有較多的附著物,每顆採苗器約具0.35-0.55 g,其餘月份為0.16-0.27 g。 5. 浮游苗密度變化為 a. 牡蠣苗於6-8月密度甚低(0.34-0.9 ind’s/100 L),9月下旬與10月中旬出現二次高峰,皆有很高的密度(21.3-35.3 ind’s/100 L)。與過去五年不同,而後至12月中旬郤未見大量浮游苗。 b. 藤壺附苗月份為4至11月(1420.5-2001.1 ind’s/100 L),高水溫季節大幅降至36.7-370.5 ind’s/100 L。與往年不同之處為今年至11月中旬才不見藤壺浮游苗。 6. 附著苗密度變化為 a. 牡蠣於1-2月約為2.33-3.59 ind’s/ cm2,3-5月逐漸下降至0.95-1.11 ind’s/ cm2,6-8月附苗甚少(0.21-0.88 ind’s/ cm2),9月中旬後大幅增加至5.10 ind’s/ cm2,10月中旬亦出現一次附苗高峰。而至12月中旬,未見大量附苗。 b. 藤壺至11月中旬仍有附苗發生,4、5與8月密度較高為4.01-776 ind’s/ cm2,其餘高水溫季節為2.07-2.87 ind’s/ cm2。 7. a. 牡蠣肥滿度於1-4月為0.32-0.46,5-9月由0.51上升0.60,9月旬開始下降為0.38-0.43。 b. 牡蠣生殖腺指數於1至3月由0.08上升至0.15後,於4月下降為0.09,而後一直呈高指數狀況(0.16-0.23),至9月即大幅下降至0.07,10月再小y上升(0.10-0.13)。
英文摘要 1、Water temperature along the coastal was low during Jan. and Mar. (21.3~23.2℃). then, it increased sharply to about 28.5℃ at May. During May and Augster, it was at high (30~32℃).At September., it began to decrease to about 27~24.5℃( November ~December).
2、Salinity of the water was high during the first and the last three months of the year
(35~36 ppt). It was low and variable during high temperature season (28~33 ppt).
3、The concentration of suspending particle of the water was high during the northeast wind season (26.5~38.5 and45.5~55.3 ppm of the spring and of the winter, respectively). During hot season, it was low (28~33 ppm).
4、More matters covering the clutches during the hot seasons (May~Sep) than the other seasons, it was 0.35~0.55 g/ shell and 0.16~0.27 g/ shell, respectively.
5、Density of the planktonic larva of the oysters was lower during the hot season(0.34~0.09 ind’s/100L) .Two peaks occurred during third part of September and mid-October, the densities were high (21.3~35.3 ind’s/100L). However, no more peak occurred till middle-November, and the densities were very low. Densities of the planktonic larva of barnacles were still high before middle-November.
6、Density of the sedentary larva of the oysters on the clutches was lower during the hot season (0.21~0.88 ind’s/cm2). After middle-September, it raised to 5.10ind’s/cm2. The other peak occurred at the middle-October. No more peak occurred till middle December. There still had sedentary larva of the barnacles on the clutches at middle November.
7、Condition index of the oysters was 0.32~0.46 during January and April. It was at the highest condition of the year ( 0.51~0.60) during May and September, and dropped to 0.38~0.43 during October and December. Gonadsomatic index of the oysters was 0.08 at January and raised to 0.15 at Mar, then dropped to 0.07 at September, and arisee to 0.10~0.13.
計畫編號 95農科-14.2.1-漁-F2
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