Bodies of Freshwater.
limnologists
Scuba gear
C. M. Larsen has written: 'A world list of fishery limnologists' -- subject(s): Directories, Ichthyologists, Limnologists
A limnologist is a scientist who studies the lake environment.
They study it and record it.
investigate, study, planning, scientific
Examine or Study would both suffice
they investigate,predict,observe, and at last they hypothesis.
Investigate.
An advantage of using a correlational study is that it allows you to investigate variables that cannot be directly manipulated.
There are several: examine, study, assay, investigate.
examine, test, study, look at, research, investigate, monitor