Growth and alkaline digestive proteases activity of Parachromis dovii larvae fed live prey and formulated diets with different protein sources
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| Autores: | , , |
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| Formato: | artículo |
| Fecha de Publicación: | 2022 |
| Descripción: | Parachromis dovii is a carnivorous cichlid fish from Central America, which easily accepts formulated feeds since exogenous feeding starts; however, its larval growth is lower than that obtained using live food. For this reason, the effect of different dietary protein source combinations on growth and alkaline digestive proteases activity were tested in P. dovii larvae. The test protein mixtures were prepared using fish, meat and bone (tankage), and poultry by-product meals in different proportions (four experimental diets: D1-D4) and compared to a commercial product (Artemia cysts Vitellus) (VD) and Artemia nauplii as control (AD). At the end of the trial, larvae fed Artemia nauplii showed the best specific growth rate (SGR): 17.6% body weight per day (BW/d), contrary to the Vitellus diet which presented the lowest SGR (12.0% BW/d) (LSD, p<0.05). From the protein sources, D3 (with the highest content poultry by-products meal) showed the worst SGR (12.6% BW/d) while the other treatments gave similar values (D1: 13.5%, D2: 13.2% and D4: 13.7% BW/d). Survival was not affected by dietary treatment (over 93%, p>0.05). The lowest alkaline digestive protease activity was found six days after hatching (DAH), and it was similar among treatments. The protease activity increased up to 27 DAH, being higher with larvae fed Artemia nauplii than with the other treatments. There were no differences in protease activity among the protein mixture diets, nor were there differences when comparing it with the Vitellus, except at 20 DAH. |
| País: | Repositorio UNA |
| Institución: | Universidad Nacional de Costa Rica |
| Repositorio: | Repositorio UNA |
| Lenguaje: | Inglés |
| OAI Identifier: | oai:https://repositorio.una.ac.cr:11056/27501 |
| Acceso en línea: | http://hdl.handle.net/11056/27501 https://doi.org/10.33936/at.v4i2.4610 |
| Palabra clave: | CRECIMIENTO PROTEIN SOURCES ENZYMATIC ACTIVITY LARVAS PECES CENTRAL AMERICA LARVAL |