Age interpretation and the calculation of growth parameters of the "jundiá", Rhamdia quelen (Quoy & Gaimard, 1824) from the Santa Catarina Swamps (RS)
DOI:
https://doi.org/10.5902/2179460X25020Abstract
This study deals with age interpretation and the calculation of growth parameters of the “jundiá”, Rhamdia quelen (QUOY & GAIMARD, 1824) from the Santa Catarina Swamps, State os Rio Grande do Sul.
Ageing was determined through reading and counting of the hyaline zones of otoliths and in vertebrae. Ageing of both structures resulted very similar. Their validity was supported by the formation of one hyaline and one opaque zone per year. There is a close relationship between zone formation, air temperature and growth of the fish.
Growth curves for each sex were calculated through otoliths and vertebrae. The growth equation of von BERTALANFFY (1938) was adjusted to the length-at-agr data, using a functinal rearession (RICKER, 1973) of the FORD-WALFORD expression., in order to obtain an estimator of the asymptotic lenght (L ∞); then expression of BEVERTON (1954), provided na estimator of the catabolism coefficient (k), which allowed to calculate length-at-age values with minimum residual variances.
Sex-ratio, weight / length relationship, variation of the condition fator (k), lifespan (A0,95) and annual rate of survival (S) for each sex, was also analused.
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