MUSCLE GROWTH IN LARVAE OF ATLANTIC SEA BASS,<i> DICENTRARCHUS LABRAX</i> L., REARED AT DIFFERENT TEMPERATURES.
Abstract
Two experimental groups of Atlantic sea bass were maintained at 19ºC during embryonic period (from fertilization until hatching). After hatching, each group was separated in two tanks of larval cultivation, that were maintained at both natural temperature and 19ºC, respectively. Natural temperature initially was ≈ 15ºC and gradually raised. In both groups the transverse area of white and red muscles was quantified, as well as the size and number of their fibres. Following hatching, prelarvae reared at higher temperature (19ºC) finished the vitelline phase earlier than prelarvae maintained at natural temperature (3 and 4 days posthatching, respectively). During this endogenous phase, muscle growth took place only by hypertrophy of white and red muscle fibres, and no temperature influence on such growth was observed. After reabsortion of the vitelline sack, 20 days larvae in both groups showed a strong increase of hypertrophy and hyperplasia, being the recruitment of fibres higher in larvae reared at 19ºC (P < 0,05). This fact shows a positive correlation between hyperplasia and growth rate after the beginning of exogenous feeding, whereas during endogenous phase, muscle growth was low and it was associated to the hypertrophy of the muscle fibres. Subsequently, at 40 days, all muscle parameters were greater at 19ºC and this temperature effect was significative for all of them, except for the number of red muscle fibres.Downloads
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