Didymosphenia geminata is freshwater diatom (a type of alga) that is spreading to river systems across the United States and around the world. Although historically D. geminata has been found across the northern hemisphere, recently this species has been noted as an aggressive invader with nuisance bloom behavior. Notably, novel detections of D. geminata across eastern North America, New Zealand and South America have caused concern for managers and anglers.
RT @fedflyfishers: Didymo is an invasive species!
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