Well I only havbe these ones very shortly but Idid get eggs in H. okiensis every year (but I have no male) and also got egg deposition in 2003 of H. yiwuensis. The main problem in streamtype is acquiring them overhere, I fail to get valid breeding groups, I guess this is the main problem. I only have a few naevius, kimurae & tsuensis (all are georgeous though). In most pondtype species I have started 6 tot 12 adults. Also in H. nigrescens I only have 2 animals, so breeding would be pure luck. Well I hope one day I succeed with the other species.. let's see and wait.