Effects of salinity levels on survival rates of harpacticoid copepod Tigriopus sp. (Copepoda: Harpacticoida)
Keywords:
Tigri ous psp., culturing, salinity levels, survival rateAbstract
This research aims to study the survival rates of harpacticoid copepod Tigriopus sp. cultured at different temperatures and salinity levels. An ovigerous copepod was obtained by collecting from a brown alga, Padina sp., on Namsai sandy Beach in Chon Buri Province, Thailand, and reared at Ramkhamhaeng University. The experiment was carried out by culturing the copepods at temperatures of 25°C and 30°C, and salinity levels of 5, 10, 20, 30, 40, 45 ppt for 15 days to study the survival rate. The results showed that the temperatures and salinity levels significantly affected the survival rates of the copepods (p<0.05). The copepods cultured at the temperature of 25°C and salinity level of 30 ppt had a survival rate of 85.04%, and those cultured at the temperature of 25°C and salinity level of 20 ppt, yielded a survival rate of 82.56%. The number of survived copepods was the lowest at the salinity levels of 5 ppt and 45 ppt. It took 11 days for the copepods to develop from nauplius to adult stages, and the number of nauplii produced an average of 49±3.74.
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