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| Format: | Artículo científico |
| Sprache: | en |
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Academia Brasileira de Ciências
2016
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| Online-Zugang: | https://www.redalyc.org/articulo.oa?id=32748476002 |
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Inhaltsangabe:
- Biological variables of Hypostomus francisci (Siluriformes: Loricariidae) from Itapecerica River, Minas Gerais State, Brazil CAMILA F. SALES FABRÍCIO FLÁVIO T. DOMINGOS LUDMILA S. BRIGHENTI ROSY I.M.A. RIBEIRO HÉLIO B. SANTOS RALPH G. THOMÉ Multidisciplinaria (Ciencias Naturales y Exactas) fecundity reproduction gametogenesis population structure neotropical freshwater fish Herein we determine for the first time the reproduction parameters and population structure of Hypostomus francisci in the Itapecerica River, São Francisco Basin. A total of 250 specimens was captured quarterly between March 2010 and February 2012. Body weight, total length and weight of the gonads were obtained in the laboratory. Gonad samples were submitted to histological and histochemical techniques. Females with spawning capable ovaries were used to determine the fecundity and relative fecundity. Sex ratio with 1:1.01 (female:male) was observed. Males were more numerous than females for individuals smaller than 170 mm, however the number of females was significantly greater for specimens larger than 330 mm. The length-weight relationship estimated for H. francisci indicates negative-allometric growth. Females spawning capable were observed mostly in November-December-January. Two cohorts of oocytes at a determined time evidencing the development type group-synchronic. The eggs reaching 3.4 mm and the fecundity ranged from 312-1,460 oocytes with an average of 585.81 ± 337.43 oocytes per female. The reproductive parameters and population structure of H. francisci from Itapecerica River suggested that this species showed singular reproductive tactics among congeners. 2016 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32748476002 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.3 Vol.88