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深海魚類的洄游生活史

[蕭仁傑]

我們對於深海魚類耳石的微結構(microstructures)和穩定性同位素進行分析，以了解深海魚類個體發育時的垂直遷移模式。分析結果顯示，不同魚種有不同的垂直遷移方式(例如遷移時間與距離的變異)。

圖一、長尾鱈科仔魚及幼年魚的垂直向下遷移模式的概念圖。仔魚可能在沉降時或到達海底時變態，並且物種之間會有不同的遷移距離。

 [Shiao JC]

We analyzed otolith microstructures and stable isotope of deep sea fishes to reveal their ontogenetic vertical (downward) migration. Otolith microstructures and δ18O showed different migratory patterns, e.g., migration timing and distances, among species.

Fig. 1. A conceptual diagram showing different patterns of vertical downward migration for grenadier larvae and juveniles. The larvae may metamorphose during sinking, or they may metamorphose after settlingt on the sea floor. The migrating distances vary among the species.

 

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