Original scientific paper

Development of mandibular arch in European sea bass, Dicentrarchus labrax (Linnaeus, 1758) from the "Cenmar" hatchery, Croatia.

Snježana Kužir ; Department of Anatomy, Histology and Embryology, Faculty of Veterinary Medicine, University of Zagreb, Croatia
Zvonimir Kozarić ; Department of Anatomy, Histology and Embryology, Faculty of Veterinary Medicine, University of Zagreb, Croatia
Srebrenka Nejedli ; Department of Anatomy, Histology and Embryology, Faculty of Veterinary Medicine, University of Zagreb, Croatia

Abstract

The mandibular arch ossification process in Dicentrarchus labrax L. is described from day 15 to day 80 post-hatching (DPH). Data on this aspect of larval development were presented for both tne DPH and average standard length (Ls). Samples were collected in the "Cenmar" hatchery, near Zadar, Croatia. Preparation techniques included fixation in buffered formalin, trypsin clearing and staining with alcian blue and alizarin red. At 15 DPF (Ls 5,0 mm); there were no bony elements in the mandibular arch. The ethmoid plate represented the roof of the splanchnocranium, while Meckel's cartilage, hyosymplectic and cartilaginous palato-quadrates formed lateral walls. Cartilaginous basibranchial, hyoid bar and branchial basket constituted the bottom of the oral cavity. The first bony elements to be noticed were maxillaries (20 DPH, Ls 5,9 mm), followed by premaxillaries and dentaries (25 DPH, Ls 7,9 mm) - all with dermal (membranous) ossification. Ossification of other mandibular arch elements (angular, quadrate, retroarticular, palatine and ectopterygoid bone) was noticed at 38 DPH, Ls 14,5 mm. Pharyngeal jaws and teeth on premaxillaries and dentaries were noticed at the same time. Ossification process of the above mentioned elements (particulary quadrate bone) appears to be completed at 80 DPH, Ls 32,2 mm. Results are discussed in view of the ontogeny process connected with vital requirements in the environment.

Keywords

fish ontogeny; ossification; mandibular arch; European sea bass; Dicentrarchus labrax

Hrčak ID:

68310

URI

https://hrcak.srce.hr/68310

Publication date:

20.10.2004.

Article data in other languages: croatian

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