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Survival, growth and reproductive mode were studied in Dunaliella- fed Sri Lankan Artemia parthenogenetica raised from hatching to reproductive maturity at different salinity and temperature combinations. Survival was high in 100 and 120ppt, both at 25" (94 and 7296, respectively) and 29OC (82 and 78%, respectively). Poor sunrival was recorded in higher salinities at 29OC and all salinities at 35°C. At 21°C survival decreased rapidly to near lo%, other than in 65ppt where survival was 48%.-Growth rate at the tested salinities varied from 0.llmm day-' to 0.16mmday1 at 2l0e and from 0.23mm day1 to 0.34mm day1 at 25°C. Similar growtli(0.39mm day-') occurred in 100 and 120ppt at 29". No animals reached adult age at 21°C whereas at 25" and 2g°C, broodpouch development commenced by day 14 in 65,80 id 100ppt. Reproduction occurred only at 29°C. Ovoviviparity occurred only in the S5-and POOppt treatments on day 15 (at 68 and 56 nauplii day ', respectively). Subsequent gradual increase in salinity (4ppt day-') in the 35 and lOOppt treatments made the ovoviviparous groups to switch tooviparity at 132ppt (at37cystsadult ')and 136ppt(at38cysts adult1), respectively. Animals reared in l2Oppt also reproduced, but without switching, showing oviparity (at 36 cysts adult-') with gradual salinity increase to 140ppt. Salinity-temperature combinations ranging from 100 to l2Oppt and 25" to 30°C are, therefore, best for survival, growth and reproduction of Sri Lankan Artemia.

Effects of temperature and salinity of survival growth and fecundity of the brine shrimp Artemia parthenogenetica from Sri Lanka