When my wife worked at the Tennessee Aquarium, she endeavored to keep sculpins out of her darter tanks. Whenever she noticed a drop in a tank's darter population, she suspected a sculpin. Usually this required her emptying the tank to find the cryptically colored sculpin hiding under some rock work. Although darters and sculpins often co-occur in the wild, they don't co-occur for long in captivity.
Too bad sculpins can't hold their own against round gobies.
Chris Scharpf
Baltimore
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