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Volume 44 - Number 2 - 2009
Article

 

Effect of the rotifer Brachionus rotundiformis (Tschugunoff, 1921) addition on water quality and production, in super-intensive cultures of the Pacific white shrimp Litopenaeus vannamei (Boone, 1931)

Alfredo Campaña-Torres1, Luis R. Martínez-Córdova2*, Humberto Villarreal-Colmenares1, Jorge Hernández-López1, Josafat M. Ezquerra-Brauer3 y Edilmar Cortés-Jac

 

1Centro de Investigaciones Biológicas del Noroeste, Apdo. Postal 128, La Paz, BCS 23090, México

2Departamento de Investigaciones Científicas y Tecnológicas, Universidad de Sonora, Apdo. Postal 1819, Hermosillo, Sonora, México

3Departamento de Investigación y Posgrado en Alimentos, Universidad de Sonora, Apdo. Postal 1658, C. P. 8300, Hermosillo, Sonora, México

 

E-mail: lmtz@guaymas.uson.mx

 

The effectiveness of the rotifer Brachionus rotundiformis as exogenous natural feed combined with balanced feed on the production parameters of Litopenaeus vannamei and the water quality was evaluated. Different concentrations of rotifers were tested (0, 5, 10, 15 and 20 rotifers mL-1) during 45 days. No significant differences were assessed in the phosphate levels among treatments. The pH level was statistically lower in the treatments with 15 and 20 rotifers mL-1. Nitrate, nitrite and ammonia were significantly lower in the treatments with low concentration of rotifers (0 and 5 mL-1), while the highest values were achieved in the higher concentrations (15 and 20 mL-1) without reaching toxic levels. The weight gain, biomass, survival and specific growth rate of L. vannamei were significantly higher in the treatments with the higher number of rotifers (15 and 20 mL-1), whereas the lowest values were found in the control treatment (0 mL-1). The feed conversion ratio (FCR) was statistically lower in the treatment with the highest concentration of rotifers, while the highest FCR was found in the control. It is concluded that the use of the rotifer B. rotundiformis in high concentrations improves the production parameters on the Pacific white shrimp, without deteriorating the water quality

 

Key words: Production parameters, natural exogenous food, shrimp feeding, shrimp nutrition

 

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