The probability that prey will be retained by gill rakers of white crappies Pomoxis annularis (9–15 cm total length) was determined by comparisons of size-frequency distributions of prey in a laboratory pool and in stomach contents. White crappies trained to feed on large-bodied Daphnia magna were released individually into a pool containing that species and an assemblage of small-bodied species. Most attacks were directed at Daphnia magna, but several prey were ingested for every attack, and nonselective capture was assumed for the small-bodied among them...