Description of The River and Hornyhead Chub:
The Horned or Hornyhead Chub is moderate in size and slightly subterminal with an inconspicuous barbel in corner of mouth. This fish has no teeth. A body pattern of a back olive brown in color, with its sides having silvery color, and a belly of white. It also has a dark lateral stripe and a spot at the base of the tail, which is faint or absent in some adults. Fins contain decorative markings. Its body shape is fusiform and robust, round in cross-section. Typical adult size is 100-150 mm TL (4-6 in), with a maximum of about 225 mm (9 in). It has a forked tail and a single relatively short dorsal fin with 8 rays and without spines. Its pelvic fins are abdominal and has no adipose fin. Lastly, its anal fin with 7 rays has no spines. Its distinguishing characteristics are its moderately slightly subterminal mouth, and its defining inconspicuous barbel in the corner of its mouth. It also uniquely has 38-48 lateral line scales and a dark lateral stripe and caudal spot. Breeding adults have numerous large pointed tubercles on the top of their heads, smaller tubercles on their pectoral fins and a red or orange spot on the upper opercle behind their eyes. However juveniles look similar to adults, but have more obvious lateral stripes and caudal spots, and their tails are typically more reddish than the adult’s tail. Adults can grow to 11 cm or more, and males commonly grow tubercles on their head during spawning season.
Habitat of The River and Hornyhead Chub:
The Horned or Hornyhead Chub is found in rocky pools and runs of creeks and small to medium sized rivers. The hornyhead chub inhabits riffle/pool sections of small streams to medium sized rivers. Although they are occasionally found in dark-water streams, they are more commonly found in clear-water streams. Presence is inversely related to turbidity. Vegetation does not necessarily have an effect on abundance of adults, however, the young use vegetation extensively for cover and are found in higher concentrations in these areas, at least for the first several weeks to one month of life. This species is commonly found in water depths of 2 – 6 feet (60 – 181 cm).
Life History & Reproduction of the Horned or Hornyhead Chub:
Hornyhead chubs spawn from May through June. They become sexually mature at 2 to 3 years of age. Males build a cup shaped depression that they build up with pebbles that can be as large as 1-3 feet across and 6-8 inches high. Eggs and sperm are deposited in depressions in the nests and covered with gravel. Males defend the nest mounds from other N. biguttatus males but not other species. Other species take advantage of this defense and spawn in the nest mounds. The result of this is sometimes accidental hybridization. The same male may spawn with several females.
The hornyhead chub is a visual feeder that is active primarily during daylight. A variety of plant and animal food items are commonly reported for hornyhead chubs. Animal food items for the young include: rotifers, cladocerans, copepods, chironomids, and aquatic insect larvae. Older hornyhead chubs are known to consume: clams, snails, crayfish, worms, aquatic insect larvae, and fish.
Importance to humans:
Due to the fact that smallmouth bass, northern pike, and rock bass are thought to prey on the hornyhead chub, this type of minnow is often used as bait during fishing expeditions.
Globally, the status of the hornyhead chub is secure, but it is considered Critically Imperiled in Wyoming, Kansas, and Pennsylvania, and Possibly or Presumed Extirpated in Colorado and Nebraska. Currently, the National Heritage Program has assigned the hornyhead chub a global ranking of G5 suggesting that the species’ existence is globally secure and of least concern.
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