Growth, mortality and sex reversal in guppy and swordfish

ISBN-13: 9786206877271 / Angielski / Miękka / 56 str.

Armando Adolfo Ortega Salas; Hugo Reyes Bustamante

Opis

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.