Zuni Bluehead Sucker
Encyclopedia
The Zuni Bluehead Sucker, or Catostomus discobolus jarrovii, is a fish
only found in North America. There are 23 species of the Zuni Bluehead Sucker left, where 6 of these 23 species are found in Arizona.
The Zuni Bluehead Sucker has a slender fusiform body with a subterminal mouth. The fish’s mouth contains fleshy lips and protuberances, mainly on the lower lips. Both lips are notched laterally, and the middle separation of the lips extends all the way to the fish’s anterior margin. The position of the lips is unique to this species. A Zuni Bluehead Sucker has a generally thick caudal penduncle. For coloration, young Zuni Bluehead Suckers are dark gray-green dorsally and cream-white ventrally; while adults are slate-gray, being almost black dorsally and cream-white ventrally. Males develop a distinct coloration during spawning season; instead of being slate-gray, they become intense black with a bright red lateral band. Most individuals are 200 mm (7.87 in) at most, although few were found at 250 mm.
The Zuni Bluehead Sucker can be found in East Central Arizona, and most recently found in four small streams in 1966. Several specimens were collected from East Clear Creek and from Kin Li Chee Creek, but populations decreased in the early 1980s. However, the presence of the Zuni Bluehead Suckers was confirmed in 1987 and 2000 when individuals were collected again for genetic evaluation.
Zuni Bluehead Suckers are found in stream habitats with shade and lots of substrates like bedrock, boulders, and cobble. Pools are often edged by emergent aquatic vascular plants.
Zuni Bluehead Suckers eat algae and invertebrates off of rocks with the cartilaginous scraper in their mouths.
Zuni Bluehead suckers spawn in April through late May, when water temperature reaches 10-15°C (50-59⁰ F). Females are usually larger than males, and produce about 200-300 eggs (larger females can produce more than 450).
Due to poor watershed management, the populations of the Zuni Bluehead Sucker decreased 90% in the last 20 years. These fish are now only found in fragmented, semi-isolated stretches of their historic range.
Fish
Fish are a paraphyletic group of organisms that consist of all gill-bearing aquatic vertebrate animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish, as well as various extinct related groups...
only found in North America. There are 23 species of the Zuni Bluehead Sucker left, where 6 of these 23 species are found in Arizona.
Description
The Zuni Bluehead Sucker has a slender fusiform body with a subterminal mouth. The fish’s mouth contains fleshy lips and protuberances, mainly on the lower lips. Both lips are notched laterally, and the middle separation of the lips extends all the way to the fish’s anterior margin. The position of the lips is unique to this species. A Zuni Bluehead Sucker has a generally thick caudal penduncle. For coloration, young Zuni Bluehead Suckers are dark gray-green dorsally and cream-white ventrally; while adults are slate-gray, being almost black dorsally and cream-white ventrally. Males develop a distinct coloration during spawning season; instead of being slate-gray, they become intense black with a bright red lateral band. Most individuals are 200 mm (7.87 in) at most, although few were found at 250 mm.
Range
The Zuni Bluehead Sucker can be found in East Central Arizona, and most recently found in four small streams in 1966. Several specimens were collected from East Clear Creek and from Kin Li Chee Creek, but populations decreased in the early 1980s. However, the presence of the Zuni Bluehead Suckers was confirmed in 1987 and 2000 when individuals were collected again for genetic evaluation.
Habitat
Zuni Bluehead Suckers are found in stream habitats with shade and lots of substrates like bedrock, boulders, and cobble. Pools are often edged by emergent aquatic vascular plants.
Diet
Zuni Bluehead Suckers eat algae and invertebrates off of rocks with the cartilaginous scraper in their mouths.
Reproduction
Zuni Bluehead suckers spawn in April through late May, when water temperature reaches 10-15°C (50-59⁰ F). Females are usually larger than males, and produce about 200-300 eggs (larger females can produce more than 450).
Population Trends
Due to poor watershed management, the populations of the Zuni Bluehead Sucker decreased 90% in the last 20 years. These fish are now only found in fragmented, semi-isolated stretches of their historic range.