Comparacao da idade e do crescimento de tres especes de peixes do genero Astyanax Baird & Girard, 1854 (Osteichthyes, Charcacidae) do Rio Mogi GuaYu, S.P

Nomura, H.

Revista Brasileira de Biologia 35(3): 531-547


ISSN/ISBN: 0034-7108
Accession: 005013018

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Age was determined through the examination and counting of concentric rings on scales and vertebrae of Astyanax from the river Mogi Guacu, Brazil. Age determination by both methods (scales and vertebrae) give similar results. The Von Bertalanffy growth equation was fitted for the 3 spp.: A. bimaculatus (Linnaeus, 1758), commonly known as tambiu or lambari guacu (TA); A. fasciatus (Cuvier, 1819), commonly known as lambari de rabo vermelho [red tailed lambari (LRV)]; and A. schubarti Britski, 1964, commonly known as lambari de rabo amarelo [yellow tailed lambari (LRA)]. Rings are formed once a year, between Jan. and April for the 1st and 2nd species, and age class III-IV of LRV, and between March and June for age classes I-II and II-III of the last species. False rings are common on the scales of TA and LRA, but rare on LBV. Females of the 3 spp. reach larger size than the males, with total weight highest for TA, then LRA and LRV, with significant differences between the sexs of TA but not between the sexes of LRV and LRA.