Can you just chalk this up to 2020?! During a routine water quality test at Oak Grove Lake in South Carolina, workers found a whopping surprise: a 9-pound goldish. Yes, a 9-pound, 15-inch long goldfish. The average weight for a pet goldfish is usually .2 to .6 pounds. Wildlife officials believe someone dumped it in the lake when they didn't want it anymore -- and clearly, it's been eating well in its new home.