I have kept all of those (except scats) with turtles and the only one i would suggest you dont get is the eel tail catfish. They have a venomous spine and although generally are a passive fish they can become very nasty if attacked, i kept them with my turtles for years but one day a catfish had an altercation with the turtle(most likely started by the turtle) and it kept attacking the turtle. Although it didnt seriously harm the turtle im sure if it was left to keep attacking it the turtle would have died eventually, although a little bit smaller than the turtle, the turtle could not escape or defend itself.
Another thing to be careful of it the fish are of reasonable size is their feeding response, if they are going for the same food item i have no doubt a big enough fish could severely damage a turtle if it bites it head. If the fish arnt very big compared to the turtles it wont be an issue, but something like a barramundi will soon be big enough to be a potential hazard IMO(never tried to find out).
It also depends on how much you care about the animals you are keeping a lot of ppl couldnt care less about fish, as they are "just fish", but i got kicked off a forum yesterday for saying that a fish is no more 'special' than a reptile so there is no point going there.
Mixing fish is even more complicated, were you planning on keeping one native fish or a variety?
It also depends a lot on what you keep them in and how well its setup, there are a lot of 'zoo' type places with heaps of different fish, turtles and even things like crocs and platypi(platypuses lol) but they seem to know what they are doing and would know a lot more than can be learnt on this forum.
As with mixing anything there will be a risk, its up to you if you want to take it. A lot of it comes down to experience and/or knowledge of the animals you are dealing with, not so much this species is ok with that species.
It also depends on if the turtles are long necks or short necks, short necks CAN be safely kept with small fish under ideal conditions but long necks can catch food size fish without much trouble. Even that is a bit over simplified as turtles vary alot between species.
after all that ranting i would put it in the too hard basket, but then again i mix plenty of fish and turtles without any problems.
