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Growth pattern of the sea urchin, Loxechinus albus (Molina, 1782) in southern Chile: evaluation of growth models |
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| Authors: | Luis Flores Billy Ernst Ana M. Parma |
| Affiliation: | 1. Magíster en Ciencias c/m Pesquerías, Cabina 10, Departamento de Oceanografía, Universidad de Concepción, P.O. Box 160-C, Concepción, Chile 5. Instituto Nacional de Pesca, Letamendi 102 y La Ria, P.O. Box 09-01-15131, Guayaquil, Ecuador 2. Departamento de Oceanografía, Universidad de Concepción, P.O. Box 160-C, Concepción, Chile 3. Centro de Investigación en Ecosistemas de la Patagonia (CIEP), Concepción, Chile 4. Centro Nacional Patagónico (CENPAT), 9120, Puerto Madryn, Argentina |
| Abstract: | The growth pattern of Loxechinus albus in southern Chile was studied using size-at-age data obtained by reading growth bands on the genital plates. The scatter plots of sizes-at-age for samples collected in three different locations indicated that growth is linear between ages 2 and 10. Five different growth models, including linear, asymptotic and non-asymptotic functions, were fitted to the data, and model selection was conducted based on the Akaike information criteria (AIC) and the Bayesian information criteria (BIC). The AIC identified the Tanaka model as the most suitable for two of the three sites. However, the BIC led to the selection of the linear model for all zones. Our results show that the growth pattern of L. albus is different from the predominantly asymptotic pattern that has been reported for other sea urchin species. |
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