4 replies to this topic

[Leo1234]

Are these 2 Dormitator maculatus male and female? I have them in my grow out tank (also freshwater goby tank) and I noticed one is more colorful and had yellow edges to the fins. sorry if the picture is lower quality, They move too much when I try to take pictures (they think they are getting food) and the picture quality lowered a bit. 

I also was wanting to add them to my 150, but my 150 gallon I'm going to make more like a stream than it is. While this species seems to be from slower water, they seem to not mind the flow in the smaller aquarium and will swim in front of the pump at times. I do plan to have some areas for fish to get out of the fast water in the new setup.
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[Matt DeLaVega]

The second dorsal is supposed to be larger and longer in males. I just read that.

[Leo1234]

I think the dorsal fin is larger and longer on the one on the right in the picture, but I'm not 100% sure. What size or age do they become sexually mature at? Do they spawn in caves and object like clay pots? Not sure if I'll breed them when older if they pair up, but I might just give them somewhere to breed if they choose to do so.

[gerald]

The newborns will presumably need brackish or seawater, as do most other N. Amer tidal gobies and sleeper gudgeons.  There are some Australian ones that reproduce in freshwater, and of course the round goby introduced from Europe.

[Leo1234]

that should be fine as I plan on trying to breed stiphodon gobies at some point and those need full saltwater when juvenile, but need freshwater only as adults (would make for some good practice)
I know many rhinogobius, a few other goby groups and many gudgeons also breed in full freshwater while some breed in freshwater and develop in saltwater 

actually, speaking of north american tidal gobies, which would be easy to breed, but require brackish or saltwater when they hatch?