I have a friend, 80 yo, who studied lions all his life and lives in a very remote part of Zambia. He would never tell anybody the exact location of the lions, to avoid helping poachers and trophy hunters. I think we should be careful and do the same, when we talk about some fishes.
One of my colleagues who studies reptiles and amphibians carefully guards the locations of his study sites because the species he studies are vulnerable to illegal collectors for the pet trade. Unfortunately, guarding the location of individuals has the potential to hamper citizen science, but I agree, it's well worth considering.