Growth performance of weaning red abalone (Haliotis rufescens) fed with Macrocystis pyrifera plantlets and Porphyra columbina compared with a formulated diet期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Growth performance of weaning red abalone (Haliotis rufescens) fed with Macrocystis pyrifera plantlets and Porphyra columbina compared with a formulated diet

Authors:	Jorge Hernández Iker Uriarte María Teresa Viana Renato Westermeier & Ana Farías

Institution:	Hatchery de Invertebrados Marinos, Instituto de Acuicultura, Universidad Austral de Chile, Puerto Montt, Chile; CIEN Austral Centro de Investigación en Nutrición, Tecnología en Alimentos y Sustentabilidad, Puerto Montt, Chile; Instituto de Investigaciones Oceanológicas, Universidad Autónoma de Baja California, Ensenada, Mexico; Ficohatchery, Instituto de Acuicultura, Universidad Austral de Chile, Puerto Montt, Chile

Abstract:	A feeding experiment was carried out to evaluate two natural diets versus a formulated feed on the performance of weaning red abalone Haliotis rufescens . Four treatment diets were then investigated: a formulated diet; plantlets from culture Macrocystis pyrifera, Porphyra columbina from natural beds; and a mixed diet consisting of a blend of fresh P. columbina together with the formulated diet. This study was performed in a shallow aquaculture system with a horizontal water flow. After 90 days, significant differences were observed between treatments. The highest growth was obtained with Porphyra (3.3 mm month^?1), followed by the mixed diet (2.6 mm month^?1), then Macrocystis (2.1 mm month^?1) and lastly the formulated diet (1.4 mm month^?1). Moreover, after the diets were tested for stability and remnant nutrients after a 12-h water immersion, a positive trend appeared to be related to the protein/energy (P:E). It is concluded that fronds of P. columbina resulted in the best diet for weaning H. rufescens under horizontal water flow systems, even if apparently the water stability of the formulated diet had a negative impact on abalone performance, particularly due to a poor nutrient retention capacity. Therefore, formulated diets should be improved before being recommended for weaning red abalone.

Keywords:	abalone Haliotis rufescens weaning diets Macrocystis pyrifera Porphyra columbina

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