Data/hora: 01/06/2024 02:13:01

Provedor de dados: | Institutional Archive of Ifreme (ArchiMer)
País: | France
Título: | La variabilité des tailles individuelles à l'intérieur des cohortes et des bancs de poissons I : Observations et interprétation
Autores: | Freon, Pierre.
Data: | 1984
Ano: | 1984
Palavras-chave: | Poissons; Pélagiques côtiers:; Variabilité des tailles; Cohortes; Bancs; Fish; Coastal pelagic; Length variability; Cohorts; Schools.
Resumo: | Body length variability bas been studied in fish schools and eohorts of two tropical pelagie species. The data, and simulations associated with them allow the variations in standard deviation of cohorts to be followed, and hypotheses on spawning duration or population structure ean thus be tested. As the fish grow, the variability increases more rapidly in young eohorts than in schools with the same mean length. For older fish, the inverse phenomenon is observed: while the standard deviation of individual lengths deereases in a cohort as it gets older, this parameter continued to inerease in sehools as the mean length increases. This shows that schools of young fish eannot be eonsidered as representative of the cohort length frequency distribution, whereas sehools of adult fish are made of individuals belonging to different age classes, which sehool together according to length similarity. This last point was tested by reading age on hard parts of sorne fishes from a single school. In coastal pelagie species, schools of mixed species are often observed. In this case, ali of them have generally similar morphology and mean body length.
Tipo: | Text
Idioma: | Francês
Identificador: | http://archimer.ifremer.fr/doc/00113/22444/20131.pdf
Editor: | Gauthier-Villars
Relação: | http://archimer.ifremer.fr/doc/00113/22444/
Formato: | application/pdf
Fonte: | Oceanologica Acta (0399-1784) (Gauthier-Villars), 1984 , Vol. 7 , N. 4 , P. 457-468
Fonte: | Gauthier-Villars