The didymo invasion of Pa. waters

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In some states neighboring Pennsylvania, anglers have trouble fishing through blankets of invasive didymo algae. Often called "rock snot" because of its phglemy appearance, it fills submerged gravel crevasses smothering insect life.

Didymo was confirmed last summer in Southwest Pennsylvania, and will probably spread this year. What can anglers expect, and what can be done about the didymo invasion? Post-Gazette outdoors editor John Hayes and Maryland Department of Natural Resources aquatic biologist Ron Klauda will explore the answers at a didymo seminar 6 p.m. Feb. 15 at the Allegheny Sport, Travel and Outdoors Show at Monroeville Convention Center at Monroeville Mall.

The expo runs Feb. 13-17. $10 adults, 12 and under free. Get details at

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