Oxygen consumption in <i>Oreochromis niloticus</i> (L.) in relation to development, salinity, temperature and time of day

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<jats:p>Oxygen consumption of <jats:italic>Oreochromis niloticus</jats:italic> at different stages of development was studied in relation to salinity, temperature and time of day, using a Warburg apparatus. The oxygen consumption of newly hatched (0–14 h) larvae was 3.40 μl O<jats:sub>2</jats:sub> larva<jats:sup>−1</jats:sup> h<jats:sup>−1</jats:sup>, of older yolk sac larvae 10.09 μl O<jats:sub>2</jats:sub> larva<jats:sup>−1</jats:sup> h<jats:sup>−1</jats:sup>, and of one‐month‐old fry 32.99 μl O<jats:sub>2</jats:sub> larva<jats:sup>−1</jats:sup> h<jats:sup>−1</jats:sup>. The QO<jats:sub>2</jats:sub> values showed a decrease with development and growth, ranging from 21.2–26.0 μl O<jats:sub>2</jats:sub> mg<jats:sup>−1</jats:sup> h<jats:sup>−1</jats:sup> in newly hatched larvae to 2.97 μl mg<jats:sup>−1</jats:sup> h<jats:sup>−1</jats:sup> in one‐month‐old fry. Changes in oxygen consumption occurred with salinity, the highest being at 17%o. Active larvae (12‐24 mm T.L.) showed a doubling of consumption with a 10° C rise in temperature, and their Q<jats:sub>10</jats:sub> factor increased from 2.25 to 3.43 with increasing size. Day‐old yolk‐sac larvae, late yolk‐sac larvae (5 days old) and fry of 12 14 mm length all showed a depression in oxygen consumption at midnight followed by a dawn rise.</jats:p>

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