Abstract
The eggs of the loach minnow, Tiaroga cobitis, were deposited on the undersides of cobble in moderate-velocity riffles. Nearshore larval nursery areas were characterized by slower velocities and smaller substrate particles. Larger individuals occupied higher velocity microhabitats with cobble substrates. Geographic differences in microhabitat distributions of juveniles and adults were minor and were probably related to habitat availability. Male and female T. cobitis in their second summer (Age I) comprised the bulk (60%+) of the spawning population. Spawning in the Cliff-Gila Valley reach of the Gila River in New Mexico occurred for a brief period in April 1984 when daytime water temperatures were 16-20 C. Larval growth was rapid, and by autumn, Age-0 fish were 30-35 mm SL. Thereafter, growth was slower and few individuals exceeded 60 mm SL or Age II. Tiaroga cobitis fed mainly upon ephemeropteran naiads and chironomid larvae. Destruction and modification of riffle habitat and establishment of non-
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