Evaluation of Aquatic Insect Emergence Traps1

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Abstract
Performance of submerged and floating pyramidal-traps was compared with that of a new design, the staked box-trap for estimating the emergence of midges (Chironomidae and Chaoboridae) in waste-stabilization lagoons. The box-trap and pyramidal-traps collected similar numbers of midges, but the former was superior for servicing because, after a sliding base was inserted, adults could be killed and aspirated. This technique eliminated loss of adults. Submerged traps captured only 5% as many midges as did the surface traps. Field and laboratory results indicated that dear plastic traps catch more midges than black plastic traps of similar design and are therefore considered to give a more accurate estimate of emergence. Criteria for accurate estimation of emergence are discussed.