Resumen

TABARES, C.J et al. Efecto de la pluviosidad y el brillo solar sobre la producción y características del semen en el pez Brycon henni (Pisces:Characidae). Rev. biol. trop [online]. 2006, vol.54, n.1, pp.179-187. ISSN 0034-7744.

Effect of pluviosity and sun shine on sperm production and seminal characteristics of the fish Brycon henni (Pisces:Characidae). In Colombia the fish Brycon henni is a protected endemic species. It inhabits water bodies in coffee producing areas (700-1900 ma.s.l.; 4º35’56’’ N -74º04’51’’ W; 18-28°C). Insufficient knowledge of its basic biology and behavior prevent the commercial culture of this promising fish. We studied the production and sperm physiology of captive males. Along a year 20 samples were taken from each of 10 males. The sample was obtained by abdominal cefalo-caudal massage and transported to the laboratory at 4°C. Except for September and October (maximum rainfall),sperm was always obtained in at least 50% of the males. Color, osmolality and pH were similar in all the samples. Volume, concentration, viability, motility and activation time were variable: sunshine had a positive effect on volume (Spearman p<0.05) and on sperm concentration (Spearman p<0.05) while pluviosity had a negative effect on volume and viability. The proportion of ions (Na,K,Mg,Ca)was constant along the year; Na being 10-fold higher than K and 100-fold higher than Mg and Ca; however the absolute concentration of all ions was slightly higher in April and in July (with no apparent relation with the other variables analyzed).Rev.Biol.Trop.54(1):179-187. Epub 2006 Mar 31.

Palabras clave : Spermiology; ion concentration; environmental conditions.

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