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ABSTRACT
A method for measuring reproductive success in the rock bass, Ambloplites rupestris (Rafinesque), is described, having potential application to other substrate brooding fishes. The method requires collecting post-hatch but non-free-swimming wrigglers by suction, separating them from associated debris, photographing them, returning them to their nests, and counting them on enlarged projections of the photographs. Advantages of this method include precision, inexpense, efficiency, ease, and ecological soundness.