Evaluación de la ginogénesis de trucha arcoiris (o. mykiss), utilizando choque térmico de 27ºC a diferentes periodos de exposición, en el centro ambiental guairapungo (Nariño)

Abstract

ABSTRACT: In intensive farming of rainbow trout (Oncorhynchus mykiss), which is the second most important fish species in Colombian aquaculture, only female alevines stocking is recommended since, because of tropical conditions, males present sexual precocity and use high percentage nutrients in sperm formation, decreasing growth, presenting more aggressiveness and therefore causing continuous attacks and injuries to females, which negatively affect the profitability of trout farms. For these reasons, this research evaluated the efficiency of gynogenesis in only female alevines production and their effect in growth. This technique is based on the exclusive transfer of genetic information from the mother, since the paternal genome is inactivated by irradiation with ultraviolet light (UV), prior to fertilization and the thermal shock eggs are put down which favors the retention of the second polar body during the second mitosis thus producing diploid alevines.

From the above reasons, the present research proposed to determine the optimal 27 °C thermal shock exposure time for eggs in terms of higher percentage of females and better zootechnical parameters, during hatchery. The study showed that the highest percentage of gynogenetic fish was obtained in treatment 4 (27 °C thermal  shock during 15 minutes), which reported statistical differences (p<0.05) compared to the other treatments, in the studied variables including weight and height increment, simple growth rate and survival.

Keywords:

embriones

irradiación

monosexo

sobrevivencia

embryos

irradiation

monosex

survival

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