Development of the axial skeleton in the bay snook Petenia splendida Gunther, 1862 (Perciformes: Cichlidae)

作者：Gi**ert E^*; Alcaraz C; Tovar Ramirez D; Alvarez Gonzalez C A

来源：Journal of Applied Ichthyology, 2014, 30(4): 783-789.

DOI：10.1111/jai.12512

We report the first description of the ontogenic development of the axial skeleton and unpaired fins of hatchery reared bay snook (Petenia splendida, Perciformes: Cichlidae) from hatching (5.3-5.5 mm in standard length, SL) to the juvenile stage (16.1-17.5 mm SL) by means of alcian blue-alizarin red staining. The study of axial skeleton development was complemented by digital analysis of its level of ossification (number of red pixels) in order to identify major changes in vertebral column and caudal fin complex development. The main events of the skeletogenesis of the vertebral column and unpaired fins in P. splendida larvae were comprised between the onset of notochord segmentation and completion of the caudal fin complex at 6 (171 degree days post hatch, ddph; 6.4-6.5 mm SL) and 24 days post hatching (dph) (684 ddph, 8.9-9.4 mm SL), respectively; whereas the anal and dorsal fins completed morphogenesis at older ages (36 dph, 1026 ddph, 11.0-11.8 mm SL). In this sense, the development of a subcarangiform swimming mode in early juveniles was achieved with complete ossification of vertebral bodies and caudal lepidotrichia, as well as partial ossification of the caudal-fin complex elements (hypurals, epurals, uroneural and parahypural). This information can be considered as a reference for other studies evaluating the quality of larvae and the influence of rearing biotic and abiotic factors in the skeletogenesis of this cichlid species and the occurrence of skeletal deformities.

• 出版日期2014-8