Revista Colombiana de Ciencias Pecuarias (Mar 2011)
La dieta usada en la primera alimentación afecta la ganancia de peso y longitud total de larvas de cachama blanca (Piaractus brachypomus) Efeitos dos alimentos utilizados na primeira alimentação sobre ganho de peso e comprimento total em larvas de pirapitinga (Piaractus brachypomus) Initial diet composition affects weight gain and total length of Pacu (Piaractus brachypomus) larvae
Abstract
Se evaluó la ganancia de peso, la longitud y la supervivencia de larvas de cachama blanca (Piaractus brachypomus) alimentadas con varias dietas. A las 36 horas post-eclosión las larvas se alimentaron por primera vez y durante tres días consecutivos con nauplios de Artemia salina (T1), plancton silvestre filtrado a 200 μm (T2), concentrado pulverizado con 48% de proteína bruta (T3), o ayuno (T4). Los animales se mantuvieron a una densidad de 70 larvas por litro. Se observaron diferencias estadísticas significativas (pForam utilizadas larvas de pirapitinga (Piaractus brachypomus) foram mantidas em densidade de 70 larvas/L. Por três dias consecutivos, as larvas eram alimentadas com náuplios de Artemia salina (T1), plâncton selvagem filtrado (200 μm) (T2), ração em pó com 48% de PB (T3) e o tratamento controle era mantido em jejum (T4). Os resultados mostraram diferença significativa (p Weigh gain, length, and survival of Pacu (Piaractus brachypomus) larvae were analyzed after they were fed one of four diets. At 36 hours post-hatching larvae were fed for the first time and during three consecutive days: Artemia salina nauplii (T1), wild plankton filtered to 200 microns (T2) , concentrated powder with 48% crude protein (T3) or no diet (fasting, T4). Animals were kept at a density of 70 larvae per liter. Statistically significant differences were observed with respect to the final weight for T1, T2, T3, and T4 (2.2 ± 0.3a, 1.7 ± 0.3b, 1.5 ± 0.3bc, 1.5 ± 0.2c mg, respectively) , final length (6.37 ± 0.29a, 0.20b ± 6.16, 5.95 ± 0.27c, 0.26c ± 5.87 mm, respectively), weight gain (0.77 ± 0.39a, 0.31b ± 0.34, 0.16 ± 0.37bc, 0.08 ± 0.21 c mg, respectively) and length gain (0.39 ± 0.17A, 0.18 ± 0.15b, 0.16c ± -0023, -0102 ± 0.15c mm, respectively). The T1 diet had the best results for optimal growth, followed by T2. The survival rate was not statistically different among treatments. These data suggest that the initial diet composition can affect subsequent growth characteristics of Pacu larvae.
