Marine Science Faculty Publications

Influence of Temperature on Yolk Resorption in Common Snook Centropomus Undecimalis (Bloch, 1792) Larvae

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Aquaculture, Growth, Larval development, Ontogeny, Snook

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To determine the optimal rearing temperature for Centropomus undecimalis larvae during the yolk resorption period, changes in larval development were measured at four different temperatures (23, 25, 28 and 31°C). Yolk and oil-globule volume was recorded for 25 larvae at four different times. This involved an initial measurement at hatch and at 24, 48 and 72 h posthatch (hph). Additional morphological measurements included standard length, body height and eye diameter. On average, at the end of the three trials, larvae reared at 25°C had a longer mean standard length than larvae reared at 23, 28 and 31°C. Larvae reared at 25°C also had more yolk and oil globule reserves than larvae raised at 28 and 31°C. The body height:length residuals were also the highest at 25°C (i.e. larvae had deeper or stockier bodies). The yolk sac was present up to 72 hph at 23 and 25°C, while it was entirely consumed after 48 hph in larvae held at 28 and 31°C. Larvae showed the fastest growth during the first 24 hph in all temperature treatments; this period corresponded to the highest energy consumption as determined by the decrease in yolk sac and oil-globule volume. Eye diameter did not vary significantly with time during yolk-resorption. We conclude that a temperature near 25°C is optimal for raising snook larvae during the yolk-resorption period.

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Citation / Publisher Attribution

Aquaculture Research, v. 46, issue 7, p. 1679-1687