Larval ontogeny and morphology of giant trahira Hoplias lacerdae

In the present study, the morphology and behaviour of giant trahira Hoplias lacerdae larvae were investigated, from hatching to complete absorption of the yolk sac, under laboratory conditions. In the first day post‐hatching (dph), the larvae presented a big ovoid‐shaped yolk sac that underwent regr...

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Bibliographic Details
Published in:Journal of fish biology 2010-03, Vol.76 (4), p.852-861
Main Authors: Gomes, M. L. M., Matta, S. L. P., Araújo, V. A., Silva, G. M. F., Zacaro, A. A.
Format: Article
Language:English
Subjects:
Characiformes
developmental biology
Hoplias lacerdae
neotropical fish
scanning electron microscopy
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Summary:In the present study, the morphology and behaviour of giant trahira Hoplias lacerdae larvae were investigated, from hatching to complete absorption of the yolk sac, under laboratory conditions. In the first day post‐hatching (dph), the larvae presented a big ovoid‐shaped yolk sac that underwent regression during larval ontogeny. The mouth opened 3 dph, when the pectoral fins were evident. From this day, the larvae were able to perform sudden bursts of activity and appear to be able to swim a few centimetres before sinking again. The branchial apparatus was defined at 5 dph, and by 6 dph the operculum was formed. The internal organs such as intestine, liver, kidney and external sensorial structures were present at 7 dph. The yolk sac remained until 7 dph.
ISSN:0022-1112
1095-8649
DOI:10.1111/j.1095-8649.2010.02540.x