| Nome: | Descrição: | Tamanho: | Formato: | |
|---|---|---|---|---|
| 1.94 MB | Adobe PDF |
Orientador(es)
Resumo(s)
An investigation of age and growth in the Iberian chub Leuciscus pyrenaicus Gunther, 1868 revealed
a seasonal growth pattern, with annulus formation restricted to a short period of the year
(May/June). Maximum ages were 6+ for both sexes. During and after the third year females grew
at faster rates than males, and the most important decrease in growth rates occurred between age I!
and Ill in males and between age Ill and IV in females. Mean back-calculated standard lengths of III and IV age classes were significantly higher in the River Sorraia. Mean weights of I and II age classes were higher in Sor stream whereas the individuals from III ad IV age classes were heavier in the River Sorraia. Shifts in growth rates arc discussed in relation to seasonal and spatial variations
in the environmental conditions as well as to sexual maturity.
Descrição
Palavras-chave
Contexto Educativo
Citação
Geraldes, Ana Maria; Collares-Pereira, M.J. (1995) . Preliminary insight into age and growth of the Iberian chub (Leuciscus pyrenaicus) in the Sorraia system. Folia Zoologica. ISSN 0139-7893. 44:2. p. 159-165
Editora
Institute of Vertebrate Biology. Academy of Sciences of the Czech Republic