ฃMaterials and Methods
This study was conducted in the Constant Temperature Room of the Oklahoma State University Aquatic Biology Laboratory, Stillwater, Okla- homa. The temperature of this room was maintained at 24-27 C for the duration of the study.
At least six pairs of T. leeri were maintained throughout the study. All fishes were of breeding or near-breeding age when paired. Sizes rang- ed from 40-90 mm standard length. AMales and females of equal or near-