Abstract

The rotifer Brachionus plicatilis is grouped according its size in three strains. Us, S, and L, with worldwide distribution. These strains have been isolated and cultured successfully, using them in marine and freshwater fish and crustaceans larvae. In Margarita island, Venezuela this rotifer growth widespread in coastal lagoons, where the strain used in this experiment was isolated (14.78 +- I .33 pm). The microalgae Tetraselmis chuii, Nannochloris oculata, Dunaliella salina, Chlorella sp., Chaetoceros gracilis and Isochrysis galbana were cultured in 5-14 I glass container. in a lab with air temperature 23 +- 1°C each container had been with air and light. When the microalgae reach the exponential growth, the rotifer B. plicatilis was inoculated (I rot/ml). In the other hand, another glass containers were inoculated initially with the yeast Saccharomyces cerevisiae and others with dehydrated blue-algae Spirulina maxima at 500 mg/container initially, an 250 mg/container through the seven days. The results showed that when T. Chuii was used the rotifer production was 325,000 rot/l, N. oculata produced 215,000 rot/l, Chlorella sp. 146,000 rot/l, D. salina 245,000 rot/l, C. gracilis 256,000 rot/l, I. galbana 171,000 rot/l, S. cerevisiae 178,000 rot/l, and S. maxima 95,000 rot/l, There were not detected any morphological alteration in rotifers with the diets used. The male rotifer were not found in this strain during this trial.

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