Population biology of dominant fish species of the Santa Bárbara River, a tributary of Nova Avanhandava Reservoir (low Tietê River, São Paulo State, Brazil) - DOI: 10.4025/actascibiolsci.v31i1.650 / Population biology of dominant fish species of the Santa Bárbara river, a tributary of the Nova Avanhandava reservoir (low Tietê river, São Paulo State, Brazil) - DOI: 10.4025/actascibiolsci.v31i1.650
Acta Sci. Biol. Sci.
; 31(1): 55-63, 2009.
Article
em Pt
| VETINDEX
| ID: vti-725594
Biblioteca responsável:
BR68.1
ABSTRACT
The aim of this study is to characterize some population biology parameters of P. squamosissimus, A. altiparanae and S. maculatus, the dominant fish species of the Santa Bárbara River, a tributary of the Nova Avanhandava Reservoir, low Tietê River. Fish samplings were performed monthly between September/2002 and August/2003, using gill nets with different mesh sizes. Females of all species have larger standard lengths than males (Mann-Whitney, p
RESUMO
The aim of this study is to characterize some population biology parameters of P. squamosissimus, A. altiparanae and S. maculates, the dominant fish species of the Santa Bárbara river, a tributary of the Nova Avanhandava reservoir, low Tietê river. Fish samplings were performed monthly between September/2002 and August/2003, using gill nets with different mesh sizes. Females of all species have larger standard lengths than males (Mann-Whitney, p 0.0001), and are more frequent in superior size classes (Kolmogorov-Smirnov, p 0.0001). All populations presented isometric growth, but differences between males and females were observed. Only P. squamosissimus presented a gender ratio different from 11, with a higher proportion of males (12, 2, p 0.05). The onset of gonadal maturation occurs at 15 cm in P. squamosissimus, 9 cm in S. maculates and at 8.9 cm in A. altiparanae. In all species populations, the adults predominate over juveniles. The allometric condition factor (K) of P. squamosissimus and S. maculates presented higher values in the periods from March-May and June-August, and A. altiparanae in the period from March-May (Kruskal-Wallis, p 0.05). These results indicate that the populations successfully exploit the lentic environment, and present life cycle tactics adapted to their particular means of environment occupation.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
VETINDEX
/
LILACS
País/Região como assunto:
America do sul
/
Brasil
Idioma:
Pt
Revista:
Acta Sci. Biol. Sci.
/
Acta sci., Biol. sci
Assunto da revista:
BIOLOGIA
Ano de publicação:
2009
Tipo de documento:
Article
País de publicação:
Brasil