Early life of the abalone Haliotis tuberculata coccínea: development, settlement and growth
- Autores: Gercende Courtois de Viçose
- Directores de la Tesis: Marisol Izquierdo López (dir. tes.), Sylvain Huchette (codir. tes.)
- Lectura: En la Universidad de Las Palmas de Gran Canaria ( España ) en 2011
- Idioma: español
- Tribunal Calificador de la Tesis: Ricardo Haroun Tabraue (presid.), Carmen María Hernández Cruz (secret.), Francisco Javier Roo Filgueira (voc.), Stephanie Auzoux Bordenave (voc.), Hipólito Palacios Barber (voc.)
- Materias:
- Enlaces
- Tesis en acceso abierto en: acceda
- Resumen
In view of the interest in diversification of abalone species production, the identification of early life processes was necessary for the further development of spat production techniques adapted to Haliotis tuberculata coccinea. Therefore the main objective of this study was to "Acquire knowledge on early life history of the abalone Haliotis tuberculata coccinea and contribute to the development of its production techniques through the improvement of larval settlement as well as growth and survival rates of juveniles". Specifically, early development, settlement process and growth and survival of post-larvae and juveniles, were addressed in this study.
The first description of the complete embryo and larval development of Haliotis tuberculata coccinea, Reeve was illustrated in a micro-photographic sequence and took place in thirty-nine distinct, consecutive, stages until reaching settlement competency 62h after fertilization.
The effectiveness of different settlement induction cues, such as, crustose coralline algae (CCA); GABA; mucus; diatoms and germlings of green macroalgae, Ulvella lens and Ulva rigida as well as the effects of their age, enrichment levels and combinations, were determined based on the settlement and metamorphosis response of H. tuberculata coccinea larvae and post-larval survival. Larvae were found able to distinguish between different developmental stages and proximate composition of the substrate and to be negatively affected by larval density.
H. tuberculata coccinea settlement patterns were reflected in growth and survival of post¬larvae that presented divergence of growth rates, among diatoms diets, when reaching 0.8-lmm SL, and increased growth rates around 2 mm SL. Post-larvae nutritional requirements, especially protein correlated to higher growth and final shell length, were size and growth phase dependant, These results provide crucial technical knowledge necessary to the adaptation of culture techniques to the requirements of H. tuberculata coccinea. More particularly; Ulvaceae species presented great potential to enhance settlement, growth and survival rates and the control of diatoms and substrates nutritional quality was shown to improve abalone post-larval growth and survival, consequently influencing the efficiency and consistency of juvenile production necessary to the development and standardization of the production methods.
