Título

EFFECT OF TEMPERATURE ON HATCHING AND GROWTH OF CUBAN GAR (Atractosteus tristoechus) LARVAE

Autor

Andres Hurtado

Nivel de Acceso

Acceso Abierto

Resumen o descripción

Hatching success, growth, development and survival of Cuban gar (Atractosteus tristoechus) larvae were examined at different temperatures (26, 28 and 30 ºC) up to 18 days after hatching (DAH). The time to hatching was inversely related to the incubation temperature (87, 100 and 111 h). Larval survival at the time of hatching was significantly lower at 30 <sup>o</sup>C (50.3 %), coinciding with the highest larval mortality (30.2 %). Growth rates were 1.75 mmd-1 -10.4 % d-1 at 26 ºC,1.30 mm d-1 -10.2 % d-1-1 at 28 ºC and 1.40 mm d-1 -10 % d -1 at 30 ºC. Three similar critical periods were identified: 0-6, 7-11 and 12-18 DAH. During the first period, a similar increase in weight and a significant increase in total length occurred, mainly at 30 ºC, indicating a more efficient reconversion of the yolk reserves. Later, growth was equally slow, corresponding with the transitional period from endogenous to exogenous feeding, indicating a similar physiologic pattern regardless of incubation temperature. Weight and length increased during the last period, with the greatest increase at 26 ºC in contrast with the lowest gain at 30 ºC. The inflexion points of many morphometric characters and the developmental stages accelerated with the increasing temperature. Although it was impossible to determine the optimal temperature, it was evident that 26 ºC favored hatching success and larval growth.

Fecha de publicación

22 de enero de 2014

Tipo de publicación

Artículo

Formato

application/pdf

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Inglés

Repositorio Orígen

Repositorio Institucional de la Universidad Juárez Autónoma de Tabasco

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