Biologia populacional de Cyphocarax modestus no córrego Ribeirão Claro, município de Rio Claro (SP)


Autoria(s): Carmassi, Alberto Luciano; da Silva, Andre Teixeira; Rondineli, Giulianna Rodrigues; Braga, Francisco Manoel de Souza
Contribuinte(s)

Universidade Estadual Paulista (UNESP)

Data(s)

20/05/2014

20/05/2014

01/01/2008

Resumo

This work aimed a better understanding of the annual cycle of Cyphocarax modestus in the reservoir of water captation of Ribeirao Claro stream. The growth parameters were estimated through the analysis of length distribution and the relationships among time of smaller growth, alimentary activity, fat accumulation and reproductive period were considered. Besides, the instantaneous rate of natural mortality was calculated. Monthly samplings were accomplished in the Ribeirao Claro stream, in the reservoir of water captation of Rio Claro city. For that, 50 m of wait net was used, with meshes of 1.5, 2.0, 2.5, 3.0 and 3.5 cm measured between adjacent knots. The ELEFAN I program was used to estimate the growth parameters, and its application was done using the FISAT program. It was also used the seasonal version of von Bertalanffy's growth curve. It was considered that the reproduction of C. modestus is annual and concentrated from December to February, allowing the identification of different modas in the distributions, an essential condition for the conduction of that analysis type. The estimated parameters were: K = 0.34/year, L [infinity] = 15.40 cm, C = 0.2, Wp = 0.6 and M = 0.949/year, with the identification of four cohorts. The physiologic sequence in the annual cycle of the specie could be noted when data of accumulated fat in the visceral cavity, alimentary activity, reproduction time and time of smaller growth were analyzed together. It was noted that with the beginning of the maturation of gonads, the energy resources stopped being invested in the growth and passed to be used for reproduction.

Formato

109-114

Identificador

http://www.biotaneotropica.org.br/v8n1/pt/item?article

Biota Neotropica. , v. 8, n. 1, p. 109-114, 2008.

1676-0611

http://hdl.handle.net/11449/21311

ZOOREC:ZOOR14409053981

ZOORECZOOR14409053981.pdf

Idioma(s)

por

Relação

Biota Neotropica

Direitos

openAccess

Tipo

info:eu-repo/semantics/article