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Can't access past the abstract (I love academia) but this says this JTB is only present in males and is similar to a kidney in females. Nothing about hermaphrodatism in the group. Interesting read though, might email the researcher for a copy at some point.believe eatbreakfast talked about it once and I saw on KPA website they sell juvies and pairing with sex change.
I think this may mention it.
Reproductive Apparatus of Two Jawfish Species (Opisthognathidae) with Description of a Juxtatesticular Body on JSTOR
Maria B. Rasotto, Andrea Marconato, Douglas Y. Shapiro, Reproductive Apparatus of Two Jawfish Species (Opisthognathidae) with Description of a Juxtatesticular Body, Copeia, Vol. 1992, No. 4 (Dec. 18, 1992), pp. 1046-1053www.jstor.org
Can't access past the abstract (I love academia) but this says this JTB is only present in males and is similar to a kidney in females. Nothing about hermaphrodatism in the group. Interesting read though, might email the researcher for a copy at some point.

Genicanthus are unique among angels as they don't hold territories as mated pairs or harems, it would be more accurate to call their social style a lek, where the males hold a territory and allow the females in the area to mingle among their territories. I would imagine having multiple females would assuage the aggression of the male as he won't have a single individual to focus on and dominate. Then again, that's a theoretical based on their wild behavior, which doesn't always translate 1 to 1 in an aquarium, unless we're talking a very large one.I have a pair (well, male and female) spotbreast angels (Genicanthus melanospilos). I have had them two years now and they seem okay together in the tank. By that I mean they mostly tolerate each other. The male will sometimes chase the female for a few seconds, then give up. He is the boss of the tank anyway.
Hope to see them display some form of mating behavior in future. We will see.
I have kept dozens of neon gobies over the years. It is difficult to house two males together. I currently have two (males?). The larger is constantly attacking the smaller.Does this include things such as neon gobies?
Probably a numbers game, like the angels I mentioned earlier, a lot of fish live in larger groups where the aggression is dispersed among the lesser individuals, so nobody gets beaten to death. Should be easy to do with the size of the species unless we're talking a very small nano.I have kept dozens of neon gobies over the years. It is difficult to house two males together. I currently have two (males?). The larger is constantly attacking the smaller.

