With 1 hour exposure time, the maximum concentration of NaCl which was not toxic to rainbow trout eggs was 25 ppt at 13°C. The present study showed that interval treatment with 25 ppt NaCl for 1 h, twice a week, decreased fungal infection and increased the hatching rate of rainbow trout eggs. Continuous treatments with NaCl at concentrations of 3, 5, 7 ppt apparently increased the hatching rate to almost the same level. Furthermore, in the group treated with 7 ppt NaCl, no fungal infection was detected.
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Kitancharoen et al. (1997) studied this question.
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