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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Influencia de la temperatura sobre el crecimiento muscular de la lubina, Dicentrarchus labrax L., durante el desarrollo larvario

Ayala Florenciano, Mª Dolores 10 December 1999 (has links)
En este trabajo se ha estudiado el efecto de la temperatura de incubación y cultivo sobre el desarrollo y el crecimiento muscular de lubina, Dicentrarchus labrax, Atlántica y Mediterránea. Durante la fase de alimentación endógena el empleo de alta temperatura incrementa preferiblemente la hipertrofia, observándose una fuerte disminución de la tasa hiperplásica en la fase prelarvaria, con independencia de la temperatura. Con el inicio de la alimentación viva comienza una etapa de rápido crecimiento en la que las altas temperaturas de cultivo (17 y 19ºC) incrementan principalmente la hiperplasia fibrilar. Los lotes Atlántico y Mediterráneo mostraron un comportamiento semejante frente a la temperatura durante las fases de rápido crecimiento (larvario y postlarvario). Sin embargo, al final de cada estadío de desarrollo se apreciaron diferencias entre ambas poblaciones. La aplicación de pequeños incrementos de temperatura durante la incubación aumentó el crecimiento larvario posterior, manifiestándose principalmente al final de la metamorfosis larvaria. / The effect of incubating and rearing temperatures was studied on the development and muscle growth of both Atlantic and Mediterranean populations of D. labrax. During the endogenous feeding stage the higher temperature preferently increased muscle fibres hypertrophy. In the prelarval stage the muscle fibre hyperplasia almost ceased, and this fact was hardly modified by the temperature. Later on, during the rapid growth stage of external feeding, the hyperplastic growth of the myotome was significantly higher in the warm reared fishes (17 and 19 ºC). Muscle growth dynamics were very similar in the Atlantic and Mediteranean stocks during most of the larval and early stages of the postlarval phase (rapid muscle growth periods). However, at the end of each developmental stage both stocks showed significant differences. The application of small increases of temperature during the short incubating period of D. Labrax resulted in a gradual higher growth rate at the end of the larval development.

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