In this research work it was studied the answer of three species of microalgae from the Chlorophyte Division growing in three different culture media, in order to determinate if a differential growth exists related to the chemical composition of the media. To realize the study it was chosen pure strains of Chlorella vulgaris Beijerinck, Chlamydomonas debaryana Goroschankin Monoraphidium griffithii (Berkeley) Komárková-Legnerová and the culture media: Bristol, Knop and Waris, the last one specific for Chlorophytes. The experimental tests were done by triplicates using 250 ml flasks with 90ml of media plus 10ml of the algal culture. Qualitative and quantitative observations were done every other day in order to determine the population growth curve. The highest population ¡increase for Chlamydomonas debaryana was founded in the Bristol medium; Chlorella vulgaris, grew better in the Knop medium and Monoraphidium griffithii in Waris medium. About the results obtained we can concluded that it exists a selectivity of the species to the culture media due to their nutritional requirements
