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Volume 45 - Number 1 - 2010
Article

 


Application of multi-specific microalgae biofilm for optimization of the larvae settlement and growth of abalone (Haliotis rufescens) in a commercial hatchery

Rubén Araya1, Claudia Bahamondes2, Karina Barahona2 y Fernando Silva-Aciares2

 

1Laboratorio de Microbiología de Sedimentos, Departamento de Acuicultura, Facultad de Recursos del Mar, Universidad de Antofagasta, Casilla 170, Antofagasta, Chile

2Laboratorio de Ecología Microbiana, Departamento de Acuicultura, Facultad de Recursos del Mar, Universidad de Antofagasta, Casilla 170, Antofagasta, Chile

 

E-mail:  raraya@uantof.cl

 

This study evaluates the use of a microalgal biofilm composed by a mixture of benthic diatoms such as Amphora cf. capitellata (NV), Nitzschia ovalis arnott (NC), Cylindrotheca closterium (CC) and Navicula cryptocephala (NAV) to improve larval settlement and growth of H. rufescens postlarvae in commercial hatcheries in the north of Chile. Preliminarily the optimal growth dynamic conditions of selected diatoms were evaluated in relation light intensity by the use of polycarbonate carboys containing PVC filaments for supporting the growth of diatoms. The results showed that the different diatom strains reached the highest cell densities in terms of cell coverage, at 50 mmol· m-2· s-1 of light intensity after 120 h for NC, CC and NV strains and 144 h for NAV strain. These results guarantee the massive productions of the selected diatoms for their use as commercial scale. The determination of the multi-especific effect of selected diatoms on the settlement and growth of differents postlarvae cohorts, after 60 and 120 days from the larval metamorphosis, showed significant improvements on settlement and growth of abalone seeds. These results suggest that the utilization of benthic diatom mixtures for the culture of abalone postlarvae at commercial scale improve the disponibility of food for the abalone Chilean industry

 

Key words: Diatoms, settlement, growth

 

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