Interesting fish Gordon. I don't get any youngsters in my pond, the fish spawn frequently, but there are too many gaping mouths for any to survive. I've plenty of cover for them to hide amongst as you can see my pond is well planted, but none seem to make it. Have no other idea why I get none....other than I own a veritable tribe of cannibals!
can b ur orfe eating
i had this problem in middle i had no fry , my pond is stream like , it has end where the pumps are , so all the water comes at end , what i did is made a damn of stones narrow shallow channel where no larger fish could enter but the water can flow in , so it was working like a skimmer just difference was there was a portion behind it fr smaller fishes, i noticed every month fry would collect there and they would not come out untill they grow large , i was amazed because before that there was no survivors then suddenly every few weeks i had fry there , i dont know if the fishes splashed the eggs around there that flew in or the fry from all the pond wud flow into it and get trapped .
beside that u can increase shallow areas where fishes can spawn and larger fishes cant enter and add more bushy plants which has dense roots . Other reason can be if there are large fishes or over populated ... the water is fluctuating its amonia, nitrites , oxygen , heat etc at some time may be after heavy feeding or at certain time, fry cant survive any fluctuation if water quality turns bad for short time , all fry will die but larger fishes will not feel any change . u can increase water flow or aeration too .