benthic-feeding insectivores found in warm (San Benito River) or cool (San Lorenzo River) streams. They are usually rare or absent where sculpins, another benthic insectivore, are common.

Sacramento PerchArchoplites interruptus (FSC, CSC, possibly extirpated) Originally present in the Pajaro River, Coyote Creek and other lowland streams connected to the Central Valley, this species has been extirpated from almost all of its native range due to the introduction of more competitive sunfishes from the eastern U.S. Sacramento perch have been introduced outside their native range in California (including Crowley Lake east of the Sierra and Clear Lake in Modoc County) and into other western and mid-western states (including Pyramid Lake in Nevada) because they often do relatively well in alkaline habitats stressful to other species. If reproducing populations of Sacramentoperch are present in the bioregion, they are probably in farm ponds.

Tule PerchHysterocarpus traski This freshwater member of the surf perch family was extirpated from Coyote Creek and the Pajaro River, but is still common in the Sacramento River delta and portions of the central valley (including San Luis Reservoir). Recently tule perch have been captured in Coyote Creek and in the Guadalupe River system, apparently entering the streams from the San Felipe Pipeline (from San Luis Reservoir) and other water distribution pipelines. Their reappearance restores a species mostly lost from the bioregion (they persisted in Lake Merced near San Francisco), but also indicates that other fish and invertebrates, including exotic invaders, can enter Santa Clara Valley streams from the Central Valley.

Tidewater GobyEucyclogobius newberryi (FE) This very small