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| Formato: | Artículo científico |
| Lenguaje: | en |
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Universidad de Costa Rica
2015
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| Acceso en línea: | https://www.redalyc.org/articulo.oa?id=44933764011 |
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- Early development in the mouth-brooding cichlid fish Satanoperca pappaterra (Perciformes: Cichlidae) Taise Miranda Lopes Fernando Garcia de Oliveira Andréa Bialetzki Angelo Antonio Agostinho Biología eggs fish larvae Ontogeny Pantanal eartheater The Neotropical region exhibits the largest diversity of fish worldwide; however, little is known about the early development of fish species from this region. Therefore, to contribute to this knowledge, this study aimed to morphologically describe the early stages of development (eggs, larvae and juveniles) of S. pappaterra using morphometric and meristic traits, and to assess changes in growth rates throughout larval and juvenile development by analyzing the relationships between various morphometric traits using analytical regression models. Both juvenile and adult individuals with mouthbrooded offspring were collected along the basins of the Cuiabá and Manso Rivers in the state of Mato Grosso, Brazil between March 2000 and March 2004. After the adults were identified, the offspring were classified according to its stage (embryonic, larval or juvenile period), and various morphometric and meristic variables were individually measured (when possible). The eggs of this species are yellow in color, oval shaped, show dendritic pigmentation within their yolk, have small to moderately sized perivitelline spaces and lack a mucous membrane and oil droplets. The horizontal and vertical diameters of the sample yolks ranged from 1.43mm to 2.70mm and 1.05mm to 1.68mm, respectively. The standard length of the larval period varied from 4.30mm to 7.16mm, and the standard length of the juvenile period varied from 10.29mm to 24.57mm. Larvae exhibit yolk sacs with internal dendritic pigmentation and dark punctate pigmen tation in the dorsal and ventral body regions, whereas irregular transverse spots along the flanks are observed during the juvenile period. Adhesive organs are only present during the yolksac stage and at the beginning of the flexion stage. The mouth is terminal during all stages of development. The myomere number varied from 22 to 29 (9 to 16 preanal and 10 to 16 postanal), and the maximal numbers of fin rays and spines were as fol lows: dorsal, xv I+10; anal, I v +8; pectoral, 16; and pelvic, I+8. Growth analyses identified periods of important change in larval morphology (i.e., metamorphosis), particularly during the flexion and postflexion stages and in juveniles. Therefore, the morphological development of S. pappaterra is consistent with the ecological require ments of this species, which primarily occurs in structured lentic environments with aquatic macrophytes. Rev. Biol. Trop. 63 (1): 139153. Epub 2015 March 01. 2015 artículo científico 0034-7744 https://www.redalyc.org/articulo.oa?id=44933764011 en http://www.redalyc.org/revista.oa?id=449 Revista de Biología Tropical application/pdf Universidad de Costa Rica Revista de Biología Tropical (Costa Rica) Num.1 Vol.63