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Sorry, I usually sit back and let others have a turn ... but I was bored with what I was doing at work! I'll let you post again floridafishman, as I probably won't get a chance to do anything for a while. Glad you are keeping them. It looks like a nice fish, though probably not a good one to...

Belted sandfish - Serranus subligarius.

Muraena pavonina?

Halichoeres prosopeion

It seems like we are each doing our local species! Nice one.

Yes, Hephaestus carbo ... known locally as a coal grunter. Your turn.

No, not a Macquarie perch. It's in a different family.

Freshwater Australian.

OK. Here you go.

There are several very similar species in Canthigaster (sharpnose puffers or tobys) with this kind of coloration. I can't really tell which one you have without seeing the tail. If you could post a photo showing the tail, I should be able to get it to species. Tony

Razorback sucker - Xyrauchen texanus. I wasn't going to respond on this, but felt I had to this time. I worked at Arizona State Uni for seven years, and knew the freshwater fish group there pretty well (was even considered a member of their lab). And this was one of the fish they worked on.

BTW, I'm sure Gillie is right - just waiting on confirmation from Fishperson.

There's a bit of confusion going on it seems! My guess was for the cardinalfish, whereas Gillie's guess was for the tetra. The tetra photo was posted because there were no guesses posted for the tetra (at that time - I posted a guess after the tetra photo was posted). So, we are waiting to see...

Many, if not most, dottyback species change sex (or more correctly, are simultaneous hermaphrodites that allocate to one or other sex). The colour changes that are observed in many dottybacks is probably associated with sex change. However, I have been reluctant to link colour to sex for many of...

I should point out that there are two other species that are closely related to P. elongatus. One (P. striatus), is readily distinguished in having dark lines on the body. The other (P. fuligifinis) is much more difficult to separate from P. elongatus. Mostly it has darker fins - though you...

Yes, I was also wondering about Pseudochromis elongatus. It has a very dark form with a yellowish face. If you can see the dark edging on the tail, then it's probably that species. This photo is of a relatively dark P. elongatus, but I have seen even darker individuals...

I still can't see some important details. It does look like it is rather underweight though. My best guess is still Ogilbyina novaehollandiae. Do an image search on that species and see if it matches up. Aside from coloration, the thing to check closely for is the position of the dorsal fin...

Can you post a better photo (and yes, I know how difficult they are to photograph!). It's probably Ogilbyina novaehollandiae, but I would need a better look to be sure. Tony

Fishobsessed7's photo looks to be Ostorhinchus sealei.

Yes, Dalto is correct. It has a restricted distribution in SE Queensland, and is threatened by habitat loss. It is easily bred, however. Because our winters are relatively mild, I'm able to keep a colony of them outside in a tub in my backyard. Your turn Dalto.

No, Australia doesn't have killifishes either. However, you are in the correct superorder of fishes.

No. It's from Australia, which has no native livebearers.

Okay - lucky guess I think. Here's the next one. I have tubs of these in the backyard, where they breed like flies.

I know diddly about cichlids, but it looks a lot like a Theraps to me ... perhaps T. wesseli.

I'm surprised no one has worked this one out. The species featured in some of my earliest fish books ... presumably because of the unusual reproductive habits. I've only seen them in shops a few times, though. I like their swordlike caudal fin ... and that's the only clue I'm prepared to give!