1. Referring to brackish water that has a salinity between 0.5 and 3.0 parts per thousand, or sea water having a salinity between 17 and 30 parts per thousand: Jane is interested in knowing more about oligohaline water, which has a low salinity level in the range of 0 - 0.5%.
2. A reference to organisms that are tolerant of only a moderate range of salinities: Oligohaline creatures are those that cannot survive in a high salinity level in oceans, but only in brackish water with a saltiness of 0.5 to 3.0 parts per thousand.