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Latin american journal of aquatic research

versão On-line ISSN 0718-560X

Resumo

MORALES, María C  e  MERUANE, Jaime. Larval condition indicators applied to the northern river shrimp Cryphiops caementarius (Molina, 1782), under condition of controlled cultivation. Lat. Am. J. Aquat. Res. [online]. 2012, vol.40, n.SpecIssue, pp.730-742. ISSN 0718-560X.  http://dx.doi.org/103856/vol40-issue3-fulltext-20.

The larval development of the Chilean northern river shrimp Cryphiops caementarius was studied, from the condition of zoea 1 up to the condition of juvenile stage, analyzing and characterizing diverse criteria that allowed checking the application of morphological and behavioral indicators for the evaluation of the larval quality of the species, under conditions of culture. The larvae, were cultured, in a tank of 250 L with water at 20 psu, at a constant temperature (25° ± 1°C), controlled with a thermostat and with 100% refill every day. The diet consisted of microalgae (Nannochloris sp. and Isochrysis sp.), rotifers (Brachionus plicatilis), nauplii of Artemia franciscana and formulated food. Five indicators were used, considering morphologic and behavior aspects: intestinal fill, midgut gland condition, gill development, swimming behavior and phototactic response. The indicators selected in the present work, were feasible of being used for the determination of the condition and quality of the larvae of C. caementarius, being able to make an effective follow-up and association with every condition of larval development, standardize desirable characteristics in the larvae and demonstrate verifiable results, using a protocol for culture and food supply. Moreover, it was possible to identify an extensive range of potential studies, based on the relationships that the morphology and the larval behavior support with the physiological capacities of the larvae in development.

Palavras-chave : indicators; larval development; ontogeny; morphology; behavior; Cryphiops caementarius; Chile.

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