AMELIORATION DE LA PRODUCTION D'ARTEMIA DANS LES SALINES TUNISIENNES PAR FERTILISATION MINERALE: DETERMINATION DE LA DOSE OPTIMALE D'EMPLOI

Improvement of the Artemia production in Tunisian salt works by mineral fertilization : Determination of optimal dose : In order to test the fertilization effect on Artemia production, six treatments of a mineral fertilization with di- ammonium phosphate (DAP) and urea (0.25xF; 0.5xF; 0.75xF; 1xF; 1.5xF; 2xF with F = 15 mg/L of DAP and 15 mg/L of urea) were compared to a control unfertilized. After the initial fertilization (day 0), a half a dose was brought once a week. At day 8, Artemia nauplii were inoculated in all tanks at the rate of 50 nauplii per liter. Physico-chemical and biological parameters of the culture were analysed each week, during the 48 days of experiment. The results showed that the optimal dose is 0.75xF; it gaves the maximal phytoplanctonic biomass expressed by chlorophyll-a has and it allowed to obtain a maximal production of Artemia (cysts and biomass). Results of Artemia production were superior to those observed in a preliminary experiment using only the F dose.