Mejora del rendimiento en criadero de Haliotis tuberculata coccinea: Valor nutricional de cuatro especies de diatomeas bentónicas

Abstract

Four diatoms species Amphora sp., Navicula incerta, Nitzschia sp. and Proschkinia sp., were tested as food for Haliotis tuberculata coccinea post-larvae settled on green macroalgae’s germlings. Experimental nursery tanks were weekly inoculated with the different diatoms and growth and survival, in each dietary treatment, were monitored during ten weeks. Proximate biochemical compositions of the four diatom species were significantly different. Growth rates presented different phases and diatoms diets only had a significant effect on growth once post-larvae reached 0.8-1 mm SL. Post-larvae fed the diatom with the highest protein and lipid contents (Amphora sp.) showed the best daily growth rate (DGR) of 50± 3μm over the feeding trial. Around 2 mm SL, juveniles exhibited increased growth rates, in all treatments, reaching 94 μm day-1, indicating a possible shift in nutrition towards green algae germlings and suggesting that those are used as a complement of the diatom diet at this stage.