As you stated, irresponsible. I would add greedy, as well.
Scientific name is Atractosteus spatula, and the grown ups' size could reach a couple of metres, at least.
However, if kept in aquariums, they would hardly reach the 1m size.
I keep and breed Stenolucius hujeta (freshwater barracuda) without any problem. Size of parents is around 30-40 cm, which is normal in captivity.
They are laying - or spraying onto sideglass above water level, I should say - eggs, regular clockwork.