Sounds like they overate their food source, and succumbed to possibly a pathogen that may be normally present that causes no problem, unless the host is stressed. In this case starving was the stressor. Nature's way of thinning the herd.
OTOH bullfrogs have been known to transfer pathogens to other susceptible native species, which is why there was a moratorium on selling bullfrogs in my area. Not sure if it's still in effect.
Had a massive tadpole dieoff one year. Never happened again.
No bass in the pond? Usually they are quite effective at thinning frogs.
Last edited by Cecil Baird1; 10/08/15 06:59 AM.
