I read the first study. The question is why are fish in a particular place at a particular time? I have questions about the results. Fish are where they are at a particular time for a multitude of reasons (not just turbidity). It is an AFS study so that is a +. The idea that fish turbidity tolerance can be measured by where fish are at a particular time and place is dubious to me. While I am a big believer in scientific studies they are often found to be lacking later on by subsequent findings. "It all depends" is often used and for good reason. Often years of experience by numerous skilled fisheries people is more trustworthy that one or two studies.

Here is a quote from the second study, also an AFS study, which I find more realistic "The tolerance of species to anthropogenic disturbances may be problematic because of the amount of judgment often required. To date, most developers of IBIs have used their professional judgment to assign tolerance classes, combining information from state fish books, personal experience, discussions with other professionals, conventional wisdom, and tolerance assignments from IBIs in other regions. We held informal discussions with several professionals who have developed IBIs and found that none had applied any quantitative methods in assigning species to overall tolerance classes."

Thoughts ? Are you by chance a scientist?

Last edited by ewest; 05/28/25 01:03 PM.