Description
White River Spinedace are bright brassy green to olive above, bright silvery on sides, and silvery white below, splashed with sooty on the sides. Anal and pelvic fins bright orange-red over most of these fins. Spinedace range in size from 30 mm to 100 mm. Some adults as big as 150 mm.
Diagnostic Characteristics
Distinguished from other Spinedace in having 5-4 teeth in main row, lateral-line scales typically fewer than 90, and melanophores extending well below the level of lateral line. Appears to be the most brightly colored of the four species of Lepidomeda, and is also the largest of the species attaining a total length of over 4 inches (Hubbs and Miller 1960).
Habitat
The White River Spinedace occurs in cool, clear springs and their outflow systems, over sand and gravel substrate. It seems to prefer shallow areas (0.5-1.5 m (1.6-4.9 ft) deep) (Lee et al. 1980). The most common aquatic plants in its habitat are watercress, pondweed, rush, pondweed, and cattail. Surrounding vegetation is needed for shade and as habitat for insects upon which the Spinedace feeds (Matthews and Moseley 1990). Scoppettone et al. (2004) found that White River Spinedace in streams orient near the bottom but frequently move up in the water column to strike at drift items. Larvae occurred near the surface and in much shallower and slower water than that used by adults and juveniles.
Ecology
The White River Spinedace is believed to have evolved in clear, cool waters within Pluvial White River System, NV (Lee et al. 1980). When the White River Spinedace was first collected in the 1930's, they occupied habitats in 18-22 C water. Other available data on discharge rates of spring outflows, dissolved oxygen levels historically occupied by this species indicate relatively similar temperatures among springs, but disparate discharge rates and oxygen values. The most common aquatic plants in its habitat are watercress, pondweed, rush, and cattail. Surrounding vegetation is needed for shade and as habitat for insects upon which the Spinedace feeds (Matthews and Moseley 1990).
Reproduction
White River Spinedace are presumed to be spring spawners since spawning colors are observed during spring snorkel surveys in March and April. Life span is up to 12 years (Scoppettone et al. 2004).