The ecology of Notropis atrocaudalis (Blackspot Shiner) including habitat associations, population age structure, reproduction, and food habits were examined in two east Texas streams from November 2001 through October 2002. Blackspot Shiner were generally found in relatively shallow, slow-flowing runs, but exhibited no strong seasonal habitat associations. The population consisted of four age groups (ages 0, 1, 2, and 3) present within a year, and estimated maximum life span was 3 years. Reproductively mature individuals were observed from March through August and temporal patterns in ovarian development, gonadosomatic index, and ova development indicated that Blackspot Shiner spawns multiple clutches of eggs over an extended spawning period. Blackspot Shiner diets consisted primarily of aquatic insects including Ephemeroptera, Trichoptera, and Coleoptera larvae.
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