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Growth, mortality and sexual reversion of guppy and swordfish were calculated over 120 days in 10 gallon aquaria, without aeration; densities of 1 fry per L, temperature ranged from 26° to 28 ºC 0.1. The average pH value was 8.1 and 8.4; O2 was 6.4 mg /l. They were fed 3 different diets with balanced feed with the addition of 3 different hormones: 1 Sten, 2 Primoteston and 3 Sostenon 250. The guppy fry fed with diet 1 showed growth of 0.48 g weight and length of 4.2 cm; with diet 2 were 0.44 g and 4.0 cm, and with diet 3 0.48 g and 4.2 cm. Swordfish with diet 1 presented values of 0.55 g weight, length of 5.4 cm; with diet 2, they were 0.59 g and 5 cm, and with diet 3 they were 0.55 g and 4.1 cm. Mortality for P. reticulata was 15% with diet 1, 7.5% with diet 2 and 20% with diet 3. For X. helleri it was 20% with diet 1, 12.5% with diet 2 and 25% with diet 3. Sexual reversion to males in guppies 88.2% with diet 1, 94.5% with diet 2 and 87.5% with diet 3. For swordfish 84.3% with diet 1, 91.4% with diet 2 and 93.3% with diet 3.
About the author
PhD in Sciences (Marine Biology), UNAM. Optimization of the production of microalgae, rotifers and cladocerans under laboratory conditions. Professor and researcher at the Facultad de Ciencias del Mar, Universidad Autónoma de Sinaloa from 1980 to 2003. Related to the Institute of Limnology "Dr. Raul A. Ringuelet". He has 11 publications.
