Morphological and morphometric aspects of early life stages of piabanha Brycon gouldingi (Characidae) |
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| Authors: | F. Faustino L. C. Makino E. Neumann L. S. O. Nakaghi |
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| Affiliation: | 1. Centro de Aquicultura da Universidade Estadual Paulista (CAUNESP), Jaboticabal, S?o Paulo, Brazil;2. Laboratório de Histologia e Embriologia do Departamento de Morfologia e Fisiologia Animal, Faculdade de Ciências Agrárias e Veterinárias, Universidade Estadual Paulista ‐ UNESP, Jaboticabal, S?o Paulo, Brazil;3. Campus Experimental de Registro, Universidade Estadual Paulista ‐ UNESP, Registro, S?o Paulo, Brazil;4. Piscicultura Buriti, Nova Mutum, Mato Grosso, Brazil |
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| Abstract: | Adult specimens of piabanha Brycon gouldingi were collected from Rio das Mortes (Mato Grosso, Brazil), adapted to captivity and induced to spawn at Buriti Fisheries (Nova Mutum, MT, Brazil). The early developmental stages of B. gouldingi were then characterized. Samples were collected at pre‐determined times from oocyte extrusion to total yolk absorption. Oocyte diameter, total larval length (LT) and yolk‐sac volume were measured. The mean ± s.d . duration of embryo developmental of B. gouldingi was 13·90 ± 0·06 h at 26·40 ± 1·13° C. The mean ± s.d . oocyte diameter was 1·13 ± 0·06 mm with 54% of oocytes ranging from 1·11 to 1·20 mm. Seven stages characterized the early developmental phase of this species: zygote, cleavage, morula, blastula, gastrula, histogenesis–organogenesis and hatching, with unique features related to each stage. At hatching, the larvae measured 3·40 ± 0·07 mm, presented an elongated shape with yolk‐sac volume of 0·46 ± 0·08 µl, non‐pigmented eyes and exhibited swimming ability. When the yolk was completely absorbed at 55 h post‐hatch, mean ± larval LT was 6·68 ± 0·65 mm, the eyes were highly pigmented and the teeth were visible. These are the first reported findings on the initial developmental stages of B. gouldingi and could be used to improve captive breeding management and conservation practices. |
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| Keywords: | early development embryos histogenesis larvae organogenesis ontogeny |
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