| Brown bullhead | |
|---|---|
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Scientific classification | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Siluriformes |
| Family: | Ictaluridae |
| Genus: | Ameiurus |
| Species: | A. nebulosus |
| Binomial name | |
| Ameiurus nebulosus (Lesueur, 1819) | |
| Synonyms[2] | |
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Thebrown bullhead (Ameiurus nebulosus) is a fish of the familyIctaluridae that is widely distributed in North America. It is a species ofbullhead catfish and is similar to theblack bullhead (Ameiurus melas) andyellow bullhead (Ameiurus natalis). It was originally described asPimelodus nebulosus byCharles Alexandre Lesueur in 1819, and is also referred to asIctalurus nebulosus.
The brown bullhead is also widely known as the "mud pout", "horned pout", "hornpout", or simply "mud cat", a name also used with the other bullhead species.
The brown bullhead is important as aclan symbol of theOjibwe people. In their tradition, the bullhead orwawaazisii is one of six beings that came out of the sea to form the original clans.[3]
The brown bullhead grows to be approximately 21 inches (53 cm) in length[4] and is a darker brown-green dorsally, growing lighter green and yellow towards the ventral surface. The belly is off-white or cream, and the fish has no scales.[5] Additionally, there are darker, brown-black speckles along the entire surface of the fish. The brown bullhead has a dorsal fin that bears a spine,[6] a singleadipose fin posterior to the dorsal fin, abdominalpelvic fins, and ananal fin with 21 to 24 rays. The tail is only slightly notched, with the dorsal and ventral lobes angling inward. The pectoral fins have spines that bear five to eight serrated teeth on their posterior edge.[7] The fish has eightbarbels around its mouth.[8] The barbels on the chin are black to yellowish brown.[9] Juvenile brown bullheads are similar in appearance, but are more likely to be of a single solid color.[5]
The brown bullhead's mouth is terminal[5][8] or slightlysubterminal,[5] with the upper jaw projecting slightly past the lower jaw.[6] This position enablesbottom feeding. The brown bullhead may be distinguished fromflathead catfish (Pylodictis olivaris) by the absence of lateral posterior extensions on thetooth patch of the brown bullhead's upper jaw.[5][10] Adult brown bullheads range in size from 200 to 500 mm (7.9 to 19.7 in) and weigh between 0.5 kg (1.1 lb) and 3.6 kg (7.9 lb) (in extreme cases).[8] Brown bullheads areectothermic,heterothermic, and bilaterally symmetrical.[8] Brown bullheads can be distinguished from black and yellow bullheads by their yellow-black chin barbels, the absence of a hypopigmented bar at the base of the tail (which is present in black bullheads), and their 21–24 anal fin rays.[5]
The native range of the brown bullhead is in the Atlantic and Gulf Slopedrainages. More specifically, it is found fromNova Scotia andNew Brunswick toMobile Bay, Alabama, and in theGreat Lakes,Hudson Bay, andMississippi River basins (fromQuebec toSaskatchewan, south to Louisiana, and west to Texas).[11] However, there is evidence that the brown bullhead was historically absent from theGulf Coast west of theApalachicola River and east of the Mississippi River. The species is also abundant in many regions as a result ofstocking for food or sport. These locations include Georgia, Alabama, Arizona, Arkansas, California, Colorado, Hawaii, Idaho, Kansas, Kentucky, Louisiana, Maine, Missouri, Nebraska, Nevada, New Hampshire, New Mexico, Ohio, Oklahoma, Oregon, Virginia, andWashington.[12] Brown bullheads are a social non-migratory species that are known to formschools.[8]
The brown bullhead thrives in a variety of habitats, including lakes, ponds, and slow-moving streams with low oxygen or muddy conditions. In many areas of the United States, brown bullheads are opportunistic bottom feeders. The species has few natural predators and is not popular with anglers in most areas (albeit very popular in some such as theOneida Lake area of Upstate New York, where it is featured each spring by local restaurants[citation needed]), so it has thrived. Catfish are found in a variety of habitats, from lakes or murky ponds todrainage ditches. They are scarce during the day, but come out at night to feed, searching the bottom of a lake or river for food.[13] They eat insects,leeches, snails, fish, clams, and many plants. They are also known to eat corn, which can be used as bait. Similarly to other catfish, theyspawn only after the temperature of the water has reached 80 °F (27 °C) in June and July. However, cooler temperatures are required before brown bullheads will spawn in the northern US.
Brown bullheads can withstand a wide range of water temperatures and low oxygen levels. Brown bullheads can survive waters with heavy pollution anddissolved oxygen values as low as 0.2 ppm.[8] Because of bullheads' tolerance of low oxygen levels, they are less threatened bywinterkill and are capable of surviving in relatively extreme environments.[14]
This catfish is easily caught with natural bait such as worms and chickenlivers. They have a scrappy but not unusually strong fight.Anglers often catch them by fishing off the bottom. When caught in very clear water when the flesh is firm and reddish to pinkish, the hornpout is quite edible and delicious.[original research?] Nevertheless, its genial cousins such as thechannel catfish and theblue catfish are better known for their use as food. In most areas, they will not exceed two pounds in weight, with a currentInternational Game Fish Association world record of 7.375 pounds (3.345 kg).[15]
Brown bullheads typically live between six and eight years,[8] but have been recorded as old as fifteen in captivity.[citation needed] The species spawns between April and June.[16] For the duration of each breeding season, females will be monogamous.[8] There are no consistent behaviors of mate attraction. The females lay eggs in dark locations such as under rocks and inside logs,[16] where they areexternally fertilized by the male.[8] The fish face opposite one another during the fertilization process. Nests are primarily created by females, but the eggs are protected by both sexes. An egg cluster in a nest may contain between 50 and 10,000 eggs.[8] The eggs usually take six days to hatch, but may take up to 13 days. Both parents generally care for their offspring for an additional five days after the eggs hatch.[6] The young are kept in a school by a parent for up to one month. They will remain in schools as juveniles.[8]
Brown bullheads, both male and female, will reach sexual maturity around age three.[8] Brown bullheads have occasionally been recorded eating their own eggs.[17]
The fish has been introduced into many European countries, such as Poland, Germany, Sweden, Norway, Finland, Romania, Estonia, Hungary, Serbia, and Croatia. Brown bullheads have also been introduced to western North America, Chile, Puerto Rico and New Zealand.[18]
Countries who have reported adverse effects from the introduction of the brown bullhead species include Iran and Turkey.[17]
Brown bullheads areomnivorous benthic bottom feeders. Their diet consists of algae, leeches, worms, mollusks, crustaceans, insects, crayfish, other smaller fish species and fish eggs.[8][19] Brown bullheads are typically nocturnal feeders, but have been reported to feed diurnally. Bullheads have poor eyesight and are heavily reliant on their sensitive barbels to locate their food.[8] The fish are omnivorous and will reportedly eat almost anything that fits in their mouth.[14]
Brown bullheads are the most susceptible to predators in their developmental stages, primarily as eggs. They are prey to the following species:northern pike,muskellunge,walleye,snapping turtles,water snakes,green herons,yellow perch, andsunfish.[8] Additionally, brown bullheads are used for small-scale commercial fishing, recreational fishing, and more specifically for consumption and research. Predation by other fish and coexisting species is only a realistic threat to bullheads under four inches, while the biggest threat to adult bullheads is humans. Brown bullheads haveprotective coloration to avoid predation.[14] As a mode of physical defense against predators, bullhead species have a sharp spine on the leading edge of their dorsal and pectoral fins. To use this adaptation as a defense mechanism, bullheadswill stiffen the spine while being attacked, impeding the predator's ability to swallow while simultaneously releasing a venom to sting and burn the predator.[14]
Brown bullheads hold no special status on theInternational Union for Conservation of Nature and Natural Resources, the United States Endangered Species Program, or under theCITES appendix.[8] Brown bullheads can tolerate very low dissolved oxygen levels that result from industrial and domestic pollution, aiding in their overall high rate of survivorship.[8] Brown bullheads are the most abundant species in many lakes and streams across the continent.[citation needed]
In Missouri, the brown bullhead is listed as a Species of Conservation Concern and is threatened byhabitat destruction, particularly the drainage of swamps in theMissouri Bootheel for conversion into farmland.[6]
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