Threatened fishes of the world: Moxostoma congestum (Baird and Girard, 1854) (Catostomidae)

摘要

Common name: Gray Redhorse. Conservation status: Considered threatened (Propst 1999; CONABIO 2002; Jelks et al. 2008). Identification: Dorsal and lateral region olive to yellowish, ventral region whitish to pale yellow (Thomas et al. 2007). Dorsal and caudal fins dusky in inter-radial spaces (Sublette et al. 1990). D 11–12, A 6–7, P 15–16, lateral line scales 44–46 (Sublette et al. 1990). Distribution: Moxostoma congestum occupies upland streams from the Brazos drainage in Texas to the Río Soto la Marina drainage in Mexico (Jenkins 1980; Conner and Suttkus 1986). Abundance: Relative abundance typically less than 1% (Platania 1990; Cantu and Winemiller 1997; Watson 2006; Bean et al. 2007). Habitat and ecology: Occupies clear streams (Rose and Echelle 1981) and is associated with deep (>0.8 m), low current velocity (<0.1 m·s?1) habitats such as large runs and pools (Bean et al. 2007). Benthic invertivore (Cowley and Sublette 1987; Bean and Bonner 2008) with diet primarily of aquatic insects (47%), mollusks (42%), and amphipods (5%). Most common aquatic insects were Diptera and Ephemeroptera larvae (Bean and Bonner 2008). Reproduction: Individuals spawn over two periods; first in late February or early March and again in late April or early May; single or multiple clutches per period unresolved (Bean and Bonner 2008).