pbass said:
Bull sharks have been known to swim all the way up to St Louis...i believe
Someone mentioned tarpon as an example...another bad example, Tarpon have close cousins(other shad-like fish) that are completely freshwater.
There are many sharks that enter estuary and freshwater, including, but not limited to bull sharks, and some of the fish in Glyphus genus are landlocked in complete fresh. Like I said, as long as its at their "own will" they don't die, once you add additional "stress", it kills them. I use these terms in quotation marks loosely, to avoid any conflicting ideas you might conjure up in your head. Look at this post above, It FN happend, where is tito? hmmm
Nah, tarpons is a good example. Scats have no freshwater counterparts, neither does terapon jarbua, which have both been kept in pure freshwater....
I've thought about Ph also. The one Neo has is kept in complete different parameters as mine, we'll share notes and compare soon. But its not just ph, again, its another parameter that fish can tolerate as long as its their willingness and gradual, and not the extremes. People say discus need low ph, many breeders do well with them in tap water, hard and ph value of 7.5 or more. I've kept Tanganiykan cichlids, water paremeter normally 7.5-8.2, at low Ph, and they even breed, parameter around 6.2 ph. What do you think?