[en] postembryonic development ; Labeo parvus ; Morphology
[en] Postembryonic development of the external morphology and the cephalic skeleton in Labeo parvus has been studied from hatching up to 29 days post hatching. The specimens were obtained from a single artificial reproduction. After being trypsin-fixed, larvae and fry were cleared and stained with Alcian blue and alizarin Red S. The mouth opens at 18 h and the yolk sac is completely reduced at 36 h. The trabeculae, the parachardales plates, the wall of otic capsules, Meckel's catilages , the hyosymplectics are visible. At 24 h , the ceratobranchila are formed. At 36 h, the taeniae marginales, the ethmoid plate, the palatoquadrate, the hypohyals are already in place. Between 36 h and 4 days, the suspensorium is articulating with the neurocranium. At 10 days, all the important structures are formed and the chondrocranium regresses. The first bony structures, i.e. the operculars and the jaws appear at 4 days. The opercle is well developed at 6 days and functional. At 10 days, the parashenoid and teh basioccipital appear to form the floor of the braincase. From 14 to 29 days, new bony structures appear and rendre the braincase more efficient.
Applied and Fundamental FISH Research Center - AFFISH-RC