Replacing live feed with formulated diets in juvenile Patagonian red octopus (Enteroctopus megalocyathus) |
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| Authors: | E. Martínez‐Montaño I. Uriarte C. Rosas R. Amthauer A. Romero A. Farías |
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| Affiliation: | 1. Centro de Investigación y Desarrollo (CIEN Austral) CONICYT Regional R10C1002, Universidad Austral de Chile, Puerto Montt, Chile;2. Universidad Politécnica de Sinaloa, Unidad Académica de Ingeniería en Biotecnología, Mazatlán, Sinaloa, Mexico;3. Hatchery de Invertebrados Marinos, Instituto de Acuicultura, Sede Puerto Montt, Universidad Austral de Chile, Puerto Montt, Chile;4. Interdisciplinary Network of Advanced Research for Marine Larviculture of Species with Complex Lifecycles (INLARVI), Puerto Montt, Chile;5. Unidad de Docencia e investigación de Sisal, Facultad de Ciencias, Universidad Nacional Autónoma de México, Sisal, Mexico;6. Instituto de Bioquímica y Microbiología, Facultad de Ciencias, Universidad Austral de Chile, Valdivia, Chile;7. Laboratorio de Biotecnología y Patología Acuática, Instituto de Patología Animal, Facultad de Ciencias Veterinarias, Universidad Austral de Chile, Valdivia, Chile;8. Centro FONDAP: Interdisciplinary Center for Aquaculture Research (INCAR), Concepción, Chile |
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| Abstract: | Two formulated diets were evaluated to replace live crab (C) as feed for juveniles Enteroctopus megalocyathus. Formulated diets consisted of crab paste (CP) and a mixture of freeze‐dried meals of crab and squid (C&S). After 10 weeks of feeding, the effect of each diet was analysed on productive performance, nutritional and physiological condition and immune system. Both the crab and C&S diets produced the best values for specific growth rate, feed conversion ratio and protein efficiency ratio. The diet C&S proved to be the most digestible with greatest metabolized energy. The CP diet was similar to the C diet in terms of biological value and protein apparent digestibility; nevertheless, its performance was weaker for the other indicators. Furthermore, the highest α‐amylase, lipase and alkaline proteolytic activity values were observed in octopuses fed live crab, as opposed to those fed formulated feeds. The type of diet did not affect lysozyme activity in neither mucus nor haemolymph. The production of reactive oxygen species was highest in octopuses fed CP diet. It is proposed the use of C&S diet to study the nutritional requirements and to develop an optimal formulated diet for juvenile Patagonian red octopus. |
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| Keywords: | digestibility digestive enzymes feed evaluation freeze‐dried ingredients immune system metabolized energy |
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