Yeah, I was thinking about it after I made the post and figured it had a lot to do with growth rates. GSH stay in the edible zone for much of their lives. After everyone's comments I don't have any doubt that the goldfish are trouble. I was just curious about the details. One could get numerous adults that were beyond predation with SMB and any sustainable forage species, I would think.

I think Bill Cody was talking about rotenone application.

Thanks for the info!