Bodies of Freshwater.
limnologists
Limnologists study freshwater systems such as lakes, rivers, and wetlands. They focus on the physical, chemical, biological, and ecological aspects of these environments to better understand their functioning and how they are affected by human activities and natural processes. Limnologists play a key role in conservation efforts and water resource management.
Scuba gear
People who study water are often referred to as hydrologists, limnologists, or water resource engineers, depending on their specific area of focus within the field of water science.
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.
Examine or Study would both suffice
investigate, study, planning, scientific
they investigate,predict,observe, and at last they hypothesis.
An advantage of using a correlational study is that it allows you to investigate variables that cannot be directly manipulated.
analyze observe study look into scrutinize examine check out