Fish along the Florida Keys are spinning in circles until they die

> in at least 44 species

That's something quite systemic.

Are these fish that use magnetism to navigate? Like sharks do? There's a solar storm this week. Seems unlikely. Measuring LF EMF would be a good start. Maybe a HV cable?

If it's not a neurotoxin it might be a parasite like Diplostomum pseudospathaceum that is inter-species and causes the fish to get eaten more easily [0].

[0] https://www.newscientist.com/article/2129880-parasite-living...