New world collects regularly, I've seen photos of his fish, and met him a few times, you may want to Pm him for info. Here in most of Panama, water is safe to drink, but I must admit, most of the time its coffee and beer for me, and was the same in Mexico. The language barrier can be problematic, but not insurmountable. When I was in Viet Nam, parasitic water bourne illness was a regular thing.
I haven't collected here in Panama yet, because simply getting an aquarium thats large enough to keep anything worthwhile in, and then getting it to my island is quite the feat. It is my goal though. Pools or water troughs may be easier than aquariums.
I have a number of species I want to collect.
Tomocichla asfraci, Geophagis crassilabrus, Isthmoheros tuyrense, and any of the Cribroheros or Darienheros genus, but all in good time.
There ae diseases here that are a bit worrisome, especially in the Darien. Malaria, Chiccengunga, Dengue to name just a few. And then in Lake Gatun there are the crocs.
I've already been nicked by a stingray, but hey, its the journey, and in it, there are always risks, can't believe I made it this far.