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Paramoeba invadens Jones 1985 is a pathogenic marine amoeba responsible for mass mortalities of sea urchins (Strongylocentrotus droebachiensis ) of Nova Scotia between 1980 and 1983. A direct relationship between temperature and sea urchin paramoebiasis has been shown in previous laboratory and field studies. This study examined the effect of prey availability and temperature on the growth ofP. invadens in monoxenic culture (with the marine bacteriumPseudomonas nautica ). At 15°C, the specific growth rate ofP. invadens increased with bacterial prey concentration and was highest at 108 bacterial cells ml−1 . Growth rate ofP. invadens was maximal at 15 to 20°C (which corresponds to annual sea temperature maxima in the natural environment) and the minimum generation time was 19.41 h at 20°C. At 10 and 12°C, generation times were 91.18 and 73.39 h, respectively; at 2 and 5°C, there was no growth.P. invadens did not survive in monoxenic culture at 27°C. Growth rates ofP. invadens in vitro were positively correlated with time to morbidity of infectedS. droebachiensis .

Effect of Temperature and Prey Availability on Growth of Paramoeba invadens in Monoxenic Culture