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| Format: | Artículo científico |
| Language: | en |
| Published: |
Universidad Estatal a Distancia
2014
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| Online Access: | https://www.redalyc.org/articulo.oa?id=515651977010 |
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Table of Contents:
- Sex reversal, growth, and survival in the swordtail fish Xiphophorus helleri (Cyprinodontiformes: Poeciliidae) under laboratory conditions A. A. Ortega-Salas H. Reyes-Bustamante H. Reyes B. Multidisciplinaria (Ciencias Naturales y Exactas) animal feed hormone supply Sexual revertion population density aquaria without aeration The fish Xiphophorus helleri is a commercially important species. Here we analyze several cultivation variables. We studied them for 120 days in 10-gallon aquaria without aeration; 1 fry per liter, the temperature varied between 26,3 and 26,9°C. The pH ranged from 8,1 to 8,8 and the oxygen concentration from 6,2 to 6,6mg / L. Api-aba balanced fodd with 25% protein was used, three hormones were added: 1) Sten 2) Primot - eston and 3) Sostenon 250. Sex reversal was 84,3%, 91,4% and 93,3% correspondingly. A fish with treatment 1 gained an average of 0,55g and total length of 5,4cm, with treatment 2: 0,59g and 5cm; and with treat - ment 3: 0,55g and 4,1cm. The 8 th fortnight survival was 80%, 90% and 75% correspondingly; these differences are not statistically signifficant. The three treatments gave the expected results of sex reversal, growth and survival. 2014 artículo científico 1659-4266 https://www.redalyc.org/articulo.oa?id=515651977010 en http://www.redalyc.org/revista.oa?id=5156 UNED Research Journal / Cuadernos de Investigación UNED application/pdf Universidad Estatal a Distancia UNED Research Journal / Cuadernos de Investigación UNED (Costa Rica) Num.2 Vol.5