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頁籤選單縮合
題名 | Salinity Adaptation and Subsidence Attributes in the Early Stages of Japanese Eel (Anguilla japonica)=發育初期的日本鰻對鹽度之適應及其沉降之特性 |
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作者 | 張賜玲; 郭光雄; 廖一久; | 書刊名 | Acta Zoologica Taiwanica |
卷期 | 14:1 2003.05[民92.05] |
頁次 | 頁33-44 |
分類號 | 439.5 |
關鍵詞 | 日本鰻; 胚胎期; 鹽度忍受; 卵黃囊期仔魚; 仔魚行為; Anguilla japonica; Embryos; Salinity tolerance; Yolk-sac larvae; Larval behavior; |
語文 | 英文(English) |
中文摘要 | 本試驗為探討日本鰻胚胎期對鹽度之忍受度及卵黃囊期仔魚在不同鹽度(20-35 ppt)下之沉降特性及活存率。將胚胎由鹽度30 ppt直接移至不同的鹽度下孵育,結果顯示在鹽度25及30 ppt下孵育之正常仔魚及發眼仔魚之活存率明顯地比其他試驗組為高,C型的胚胎期對鹽度改變的適應能力較比多細胞期為強。卵黃囊期仔魚的沉降速度隨日齡的增加及鹽度的降低而加速,由第2日齡起,即使在鹽度30 ppt的仔魚亦沉降至底層或躺在底部上,而鹽度20 ppt組的仔魚,由第1日齡起,即沉降至底層或躺在底部上,改變鹽度以觀察卵黃囊期仔魚沉降特性的試驗中,以鹽度30 ppt下之發眼仔魚的活存率明顯比其他試驗組高。此外,卵黃囊期仔魚的活存率,明顯地會受橈足類之存在與否及底質類型(砂質或泥質)之影響。 |
英文摘要 | The tolerance of Japanese eel (Anguilla japonica) embryos to abrupt changes in salinity and their effect on subsidence and survival of yolk-sac larvae were investigated. Results show that the survival of normal and eye-pigmented larvae were significantly higher after transferring the embryos from 30 ppt to 25 and 30 ppt compared to the other salinity treatments tested. C-shaped embryos showed stronger ability to overcome changes in salinities than did morula embryos. The subsidence of yolk-sac larvae was positively correlated with age and the decrease in salinity. Most larvae in 30-ppt water moved to the lower water layer or lay on the bottom from 2 days old, while in the 20-ppt group, almost all larvae from 1 day old sank to the lower layer or lay on the bottom. The survival rate of eye-pigmented larvae was significantly higher at 30 ppt compared to other salinity levels in the experimental trial on larval subsidence. Moreover, decreases in survival of yolk-sac larvae were significantly affected by the presence of copepods and the bottom substrate (sand and silt). |
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