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Growth of Chaetoceros calcitrans was evaluated in a static system at 35 ppt salinity and different photoperiods 0:24, 6:18, 10:14 y 24:0 hours light:dark.  Bioassays were performed in bottles of 200 ml in quadruplicate under controlled laboratory conditions, using the medium F/2.  Light, temperature, pH and direct cell counts, were monitored every 48 hours.  The photoperiod directly affected cell concentration and growth rate of C. calcitrans, being higher with 24 h/light, with values of 2'713,333 cel.ml-1 and 0.17 div.day-1, while the low cell concentration and growth rate were 0 cel.ml-1 and -0.03 div.dia-1, respectively with 0 h/light. A positive linear relationship (r= 0.567; F(1,10)=4.754; P>0.05) was observed between photoperiod and algal growth rate.  The pH ranged between 6.7 and 7.5 with values tended to decrease in all treatments with the time.  A negative correlation between pH and cell density of C. calcitrans (r2= -0.369) was detected.  The results indicate that the growth of C. calcitrans is determined by photoperiod with optimal growth at continuous light.

Efecto del fotoperiodo sobre el crecimiento de la diatomea Chaetoceros calcitrans (clon c-cal) en cultivos estáticos