factors. For example, Reyes-Bustamante (1999), studying the goldfish (Carassius auratus), fighting fish (Betta splendens) and gourami (Trichogaster trichopterus), showed that juvenile fish raised on live rotifera (Brachionus plicatilis) and the cladoceran (Daphnia magna) yielded better growth than those fed with two different formulations of commercial dry fish food. Similar nutritional studies using live foods have been documented for angelfish. For exam- ple, Figueroa et al. (1977) found that angelfish fed exclusively with D. pulex produced larger and more frequent spawnings with greater fry survival than those fed exclusively on a com- mercial dry flake.