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I thought by chance they might spit them out, kinda like owl pellets, but David assured me they pass through the darter's digestive system. 4 Snail Darters produced 17 empty snail shells.
I just smelled the shells that i have saved in a film canister. They smell kinda poopy.
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Leaves are turning and the water cooling. I do not expect to snorkel anymore this year, but pulling a seine might bring some suprises.