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水產研究(1993年創刊)

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  • 日期: 2019-07-17
水產研究(1993年創刊)-龍虎斑魚苗發生殘食窒息的形態因子探討
主題: 龍虎斑魚苗發生殘食窒息的形態因子探討
摘要(中):
在石斑魚的育苗過程中,殘食是一種經常發生的行為,此在龍膽石斑與虎斑的雜交種 ‒ 龍虎斑亦然。在龍虎斑育苗過程,經常會發現因殘食失敗而導致吞嚥窒息的現象。為瞭解其原因,本研究量測龍虎斑的嘴寬、體高、全長,再合併嘴寬與體高對全長關係的兩條線性方程式後,導出殘食者對被掠食者的體長預測方程式,此預測方程式的合理性也已經由二次曲線套合觀測值之迴歸方程式確認。其次,由龍虎斑與其親代在嘴寬及體高對體長關係上的比較結果顯示,龍虎斑苗在這方面似乎表現了其母本虎斑嘴寬相對較小的特徵,因此容易發生吞噬失敗,兩者皆亡的現象。以往的經驗顯示容易出現殘食窒息的石斑魚苗,分級對牠們抑制殘食的效果有其極限,因此,建議除了定期分級外,也應從儘早開始馴餌、增加餵食頻率與保持適當馴養密度等方法著手,才能有效降低殘食率。
出版日期: 2015/6/30
標題title(英): A Morphological Explanation of Cannibalization-associated Suffocation in Giant and Brown-marble Hybrid Groupers
作者: 許晉榮‧朱永桐‧黃文彬
卷別: 23
期別: 1
頁碼: 49-55
作者 auther(英): Jinn-Rong Hseu, Yeong-Torng Chu and Wen-Bin Huang
摘要abstract(英): Cannibalism is a common phenomenon in grouper larviculture. Cannibalism is also found among hybrids of male giant and female brown-marble groupers. However, cannibalization-associated suffocation is usually observed in larviculture of this type of hybrid grouper. To explain cannibalization-associated suffocation in the hybrid, this study measured the hybrid’s mouth width (MW), body depth (BD), and total length (TL) and derived an equation for the cannibal–prey total length (TL) relationship based on a combination of the 2 linear equations of MW-TL and BD-TL for the hybrid. The reliability of this equation was checked using a quadratic equation fitted from observations in which the cannibal’s MW was equal to the maximum BD of its possible prey. Also, morphometric differences between the hybrid grouper and its parents were compared in this study. These comparisons indicated that the morphometric characteristics of the hybrid grouper appear to be more similar to those of its maternal parent in terms of having a relatively small MW which in turn results in a higher incidence of failed cannibalism causing both fish die. We surmise, moreover, that routinely grading the hybrid grouper would not produce as good of an effect as is seen among other groupers due to the cannibalization-associated suffocation seen in the hybrid grouper. Thus, in addition to grading, other manipulations such as weaning of the fry from live organisms to artificial pellets, increasing feeding frequency, and optimal stocking densities should be applied to reduce cannibalism among the hybrid.
使用語言: 中文
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