Channel catfish

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Channel catfish
Ictalurus punctatus.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Siluriformes
Family: Ictaluridae
Genus: Ictalurus
Species:
I. punctatus
Binomial name
Ictalurus punctatus
(Rafinesque, 1818)
Distribution map of channel catfish.png
Synonyms
  • Silurus punctatusRafinesque, 1818

The channel catfish (Ictalurus punctatus), known informally as the "channel cat", is North America's most abundant catfish species. It is the official fish of Kansas, Missouri, Nebraska, and Tennessee. In the United States, they are the most fished catfish species, with around 8 million anglers targeting them per year. The popularity of channel catfish for food has contributed to the rapid expansion of this species' aquaculture in the United States. [2] Europe, Asia, and South America have also widely introduced it, and many countries legally consider it an invasive species. [3] [4] [5]

Contents

Distribution & habitat

Ictalurus punctatus1.jpg

Channel catfish are native to the Nearctic realm and are well distributed in lower Canada, the eastern and northern United States, and parts of northern Mexico. They have also been introduced into some waters of landlocked Europe, specifically the Czech Republic and Romania, as well as parts of Malaysia, and Indonesia. [6] This specie is able to thrive in small and large rivers, reservoirs, natural lakes, and ponds. Its range in southern Canada includes the Great Lakes (excluding Lake Superior), and portions of the Quebec, Ontario, and Manitoba provinces. [7] Channel catfish are cavity nesters, meaning they lay their eggs in crevices, hollows, or debris, to protect them from swift currents. [8]

Characteristics

Channel catfish possess heightened senses of smell and taste. The pits of their nostrils (nares) contain odor-sensing organs with high concentrations of olfactory receptors.[ citation needed ] In channel catfish, these organs are sensitive enough to detect several amino acids at about one part per 100 million in water. In addition, the channel catfish has taste buds distributed over the surface of its entire body. These buds are especially concentrated on the four pairs of barbels (whiskers) surrounding the mouth, which have about 25 buds per square millimeter. This combination of strong senses of taste and smell allows the channel catfish to find food in dark, stained, or muddy water with relative ease. [9] They also possess a Weberian apparatus, which amplifies sound waves that would otherwise not be perceivable. [10] There is a misconception that the barbels of channel catfish sting upon contact, however the barbels lack such an apparatus and cannot sting. However, these catfish do have spines on their pectoral and dorsal fins which can inject venom and may cause injury if the fish is handled improperly. [11]

Length and weight

Weight vs. length for channel catfish, where b = 3.2293 and L 1 = 45.23 {\displaystyle L_{1}=45.23} cm CCatfish.png
Weight vs. length for channel catfish, where b = 3.2293 and cm

The average adult channel catfish measures at least 12 inches (30 centimeters) long, and weighs between 2 and 4 pounds. The largest specimen on record weighed 58 pounds and was caught in 1964 by an angler in South Carolina. [13]

As channel catfish grow longer, they increase in weight. The relationship between length and weight is not linear. The relationship between length (L, in cm) and weight (W, in kg) for nearly all species of fish can be expressed by an equation of the form:

Invariably, b is close to 3.0 for all species, is the length of a typical fish weighing 1 kg. For channel catfish, b = 3.2293, somewhat higher than for many common species, and cm.[ citation needed ]

Ecology

Feeding

Catfish have enhanced capabilities of taste perception, and are called “swimming tongues” due to the presence of taste buds all over the external body surface and inside the oropharyngeal cavity. Specifically, they have high sensitivity to amino acids, which explains their unique communication methods as follows. The catfish has a facial taste system that is extremely responsive to L-alanine and L-arginine. More specifically, their facial taste system senses heightened levels of L-amino acids in freshwater. Feeding behavior to food is due to amino acids released by food. This is reported to cause maxillary and mandibular barbel movements, which orient the catfish's posture and food search. When the food stimulates the taste receptors, it causes more excitation which is seen in exaggerated biting, turning, or mastication. [14] Like other catfish, channel catfish feed through suction by opening their mouths quickly to create a vacuum into which water and food rapidly flow. They lack large teeth and, rather than biting and chewing, swallow their food whole. [15]

Diet

Adult channel catfish, over 45 cm (17.7 in), consume fishes such as yellow perch and sunfish. The diet of adults consists of snails, clams, [16] crustaceans (such as crayfish [16] ), snakes, frogs, small fish, insects, aquatic plants, algae, seeds, grains, nuts, and even small birds and small mammals [16] occasionally. Younger channel catfish are more consistently omnivorous, eating a large variety of plants and animals. [17]

Communication

The channel catfish is adapted to limited light conditions. [18] Members of the genus Ictalurus, which inhabit muddy waters, do not depend solely on visual cues. Instead, they are known to rely heavily on chemotactic cues. Sound production may be another important means of communication among channel catfish and other species living in turbid habitats. [19]

Chemical communication

The North American channel catfish is an ostariophysan, or a bony fish occupying a freshwater habitat. [18] These fishes are known to produce club cells and alarm substances for communication purposes. Both the fish's habitat and the presence of chemosensory cells covering the body are presumably the results of favored selection for this method of communication. [18] Catfishes are capable of producing and recognizing individual specific pheromones. Through these pheromones, a catfish can identify not only the species and sex of a conspecific, but also its age, size, reproductive state, or hierarchical social status. [18]

Territoriality in channel catfish is identifiable by a change in body odor, which is recognizable by other members of the same species. [18] This chemical change in the amino-acid composition of the skin mucus can be noted by chromatographic methods, and are not long-lasting; rather, they last only long enough to communicate to other fish in the vicinity. [18] Changes may be the result of the release of the contents of the club cells. These cells do not open directly to the surface of the skin, but injury caused by fighting and other agonistic behaviors may release the cells' contents. [18] Since catfish have a dominance hierarchy system, information relative to the change of status of any fish is important in recognition of the social strata. [18]

Signal distinction

In the channel catfish, while a communication signal is directed toward the receiver and contains a specific message, an information signal is a part of the general existence of the individual or the group. [18] For example, release of an alarm signal will communicate danger, but the individual's recognition odor is only an information signal identifying one fish from another. [18] With regards to the function and contents of the club cells, the club cells may serve different functions throughout the fish's lifecycle. Variation in the contents of the club cells' information signals therefore may change with the species' needs at different stages of life. [18]

Sound production

All species of catfishes can generate sound through stridulation, and many produce sounds through drumming. [20] Stridulation consists of the clicking or grinding of bony parts on the fish's pectoral fins and pectoral girdle, and drumming consists of the contraction of specialized sonic muscles with subsequent reverberation through the swim bladder. [19] Variability in the sound signals created by the channel catfish depends on the mechanism by which the sound is produced, the function of the resultant sound, and physical factors such as sex, age, and temperature. [19] This variation may result in increased complexity of the outgoing signal and may allow for increased usefulness of the signal in interspecies communication. [19] In the channel catfish, sounds are produced only by pectoral stridulation, as this species does not express sonic muscles, [19] which are used to produce sound via direct attachments to the swim bladder or to bony plates attached to the swim bladder in certain catfish species. [20] : 8–11 

Because of the peculiar anatomy of its pectoral spine, the channel catfish relies on stridulation for successful underwater communication. This spine, an expanded fin ray with modified articulation at its base, is decorated with serrations and poisonous tissues to dissuade predators. When a fish abducts its pectoral fin, the spine moves over the pectoral girdle channel, producing noises. [21] These noises are distinguished by distinct pulses produced when the ridges on the spine's base interact with the rough surface of the girdle's channel. [19] The wide range and flexibility of motion when using fins is responsible for the variety of these stridulation noises. Different noises serve a variety of communicative purposes, including indicating behavior to predators and expressing dominance. [22]

In many channel catfish, individuals favor one fin or another for stridulatory sound production (in the same way as humans are right-handed or left-handed). [23] The first ray of the channel catfish pectoral fin is a bilaterally symmetrical spinous structure that is minimally important for movement; however, it can be locked as a defensive adaptation or used as a means for sound production. [23] According to one scholar, most fish tend to produce sound with their right fin, although sound production with the left fin has also been observed. [21]

Hearing

The inferior division of the inner ear, most prominently the utricle, is considered the primary area of hearing in most fishes. [24] The hearing ability of the channel catfish is enhanced by the presence of the swim bladder. [25] It is the main structure that reverberates the echo from other individuals' sounds, as well as from sonar devices. [25] The volume of the swim bladder changes if fish move vertically, thus is also considered to be the site of pressure sensitivity. [25] The latency of swim bladder adaptation after a change in pressure affects hearing and other possible swim bladder functions, presumably making audition more difficult. [25] Nevertheless, the presence of the swim bladder and a relatively complex auditory apparatus allows the channel catfish to discern different sounds and tell from which directions sounds have come. [20]

Communication to predators

Pectoral stridulation has been considered to be the main means of agonistic communication towards predators in channel catfish. [22] Sudden, relatively loud sounds are used to startle predators in a manner analogous to the well-documented, visual flash display of various lepidopterans. [26] In most catfish, a drumming sound can be produced for this use, and the incidences[ spelling? ] of the drumming sounds can reach up to 300 or 400 per second. [27] However, the channel catfish must resort instead to stridulation sounds and pectoral spine display for predator avoidance. In addition to communication towards predators, stridulation can be seen as a possible alarm signal to other catfish, in the sense of warning nearby individuals that a predator is near. [26]

Genetics

The channel catfish is one of only a handful of ostariophysan freshwater fish species whose genomes have been sequenced. The channel catfish reference genome sequence was generated alongside genomic sequence data for other scaled and unscaled fish species (other catfishes, the common pleco and southern striped Raphael; also common carp), in order to provide genomic resources and aid understanding of the evolutionary loss of scales in catfishes. [28] Results from comparative genomics and transcriptomics analyses and experiments involving channel catfish have supported a role for secretory calcium-binding phosphoproteins (SCPP) in scale formation in teleost fishes. [28]

In addition to the whole nuclear genome resources above, full mitochondrial genome sequences have been available for channel catfish since 2003. [29] Other studies of genetic diversity, outcrossing, etc. in channel catfish have focused primarily on inbred lines and farm strains relevant to this species' aquaculture. For example, earlier studies have compared the genetic diversity of domestic versus wild populations of channel catfish using AFLPs. [30]

Cultural & economic significance

Chuck the Channel Catfish, 1986 roadside sculpture in Selkirk, Manitoba Chuck The Channel Cat - Catfish Statue - Selkirk Manitoba.jpg
Chuck the Channel Catfish, 1986 roadside sculpture in Selkirk, Manitoba

The channel catfish is an important food source in the southern United States and is valued for the quality of its meat. [31] In the United States, catfish is the largest aquaculture industry, and channel catfish make up 90% of farm-raised catfish. In 2021, catfish farmers in the United States made $421 million in sales. Most catfish farming in the United States occurs in the southeast: Alabama, Arkansas, Louisiana, and Mississippi produce 94% of American farm-raised catfish, with Mississippi responsible for over 50%. [32]

Fishing

Channel catfish caught in a stocked lake Ictalurus punctatus3.jpg
Channel catfish caught in a stocked lake

Channel catfish are omnivores, and can be caught using a variety of natural and prepared baits, including crickets, nightcrawlers, minnows, shad, freshwater drum, crawfish, frogs, bullheads, sunfish, chicken liver, raw steak, hot dogs, and suckers. Catfish have even been known to take Ivory soap as bait. [33]

Juglines, trotlines, limb lines, and bank lines are popular methods of fishing for channel catfish in addition to traditional rod-and-reel fishing. Another method uses traps, either "slat traps"—long wooden traps with an angled entrance—or wire hoop traps. Typical bait for these traps include rotten cheese and dog food, or "stink bait", and old rotted shad. Catches of as many as 100 fish a day are common in catfish traps. An unusual method practiced in the Southeastern United States is noodling—catching catfish by hand.[ citation needed ]

When removing the hook from a catfish, anglers should be mindful of the sharp spines on the pectoral and dorsal fins.

Related Research Articles

<span class="mw-page-title-main">Catfish</span> Order of fish

Catfish are a diverse group of ray-finned fish. Named for their prominent barbels, which resemble a cat's whiskers, catfish range in size and behavior from the three largest species alive, the Mekong giant catfish from Southeast Asia, the wels catfish of Eurasia, and the piraíba of South America, to detritivores, and even to a tiny parasitic species commonly called the candiru, Vandellia cirrhosa. Neither the armour-plated types nor the naked types have scales. Despite their name, not all catfish have prominent barbels or "whiskers". Members of the Siluriformes order are defined by features of the skull and swimbladder. Catfish are of considerable commercial importance; many of the larger species are farmed or fished for food. Many of the smaller species, particularly the genus Corydoras, are important in the aquarium hobby. Many catfish are nocturnal, but others are crepuscular or diurnal.

<span class="mw-page-title-main">Gymnotiformes</span> Order of bony fishes

The Gymnotiformes are an order of teleost bony fishes commonly known as Neotropical knifefish or South American knifefish. They have long bodies and swim using undulations of their elongated anal fin. Found almost exclusively in fresh water, these mostly nocturnal fish are capable of producing electric fields to detect prey, for navigation, communication, and, in the case of the electric eel, attack and defense. A few species are familiar to the aquarium trade, such as the black ghost knifefish, the glass knifefish, and the banded knifefish.

<span class="mw-page-title-main">Teleost</span> Infraclass of fishes

Teleostei, members of which are known as teleosts, is, by far, the largest infraclass in the class Actinopterygii, the ray-finned fishes, and contains 96% of all extant species of fish. Teleosts are arranged into about 40 orders and 448 families. Over 26,000 species have been described. Teleosts range from giant oarfish measuring 7.6 m (25 ft) or more, and ocean sunfish weighing over 2 t, to the minute male anglerfish Photocorynus spiniceps, just 6.2 mm (0.24 in) long. Including not only torpedo-shaped fish built for speed, teleosts can be flattened vertically or horizontally, be elongated cylinders or take specialised shapes as in anglerfish and seahorses.

<span class="mw-page-title-main">Bluegill</span> Species of fish

The bluegill, sometimes referred to as "bream", "brim", "sunny", or, as is common in Texas, "copper nose", is a species of North American freshwater fish, native to and commonly found in streams, rivers, lakes, ponds and wetlands east of the Rocky Mountains. It is the type species of the genus Lepomis, from the family Centrarchidae in the order Perciformes.

<span class="mw-page-title-main">Iridescent shark</span> Species of fish

The iridescent shark, or iridescent shark catfish is a species of shark catfish native to the rivers of Southeast Asia. Despite its name, it is not a shark. It is found in the Mekong basin as well as the Chao Phraya River, and is heavily cultivated for food there.

<span class="mw-page-title-main">Ictaluridae</span> Family of fishes

The Ictaluridae, sometimes called ictalurids, are a family of catfish native to North America, where they are an important food source and sometimes fished for sport. The family includes about 51 species, some commonly known as bullheads, madtoms, channel catfish, and blue catfish.

Hypostomus punctatus, the suckermouthed catfish, is a tropical fish belonging to the armored suckermouth catfish family, Loricariidae. Hypostomus punctatus is a freshwater fish native to South America, in the coastal drainages of southeastern Brazil and Uruguay. It is one of a number of species commonly referred to as "plecostomus" or "common pleco" by aquarists.

<span class="mw-page-title-main">Brown bullhead</span> North American catfish species

The brown bullhead is a fish of the family Ictaluridae that is widely distributed in North America. It is a species of bullhead catfish and is similar to the black bullhead and yellow bullhead. It was originally described as Pimelodus nebulosus by Charles Alexandre Lesueur in 1819, and is also referred to as Ictalurus nebulosus.

<span class="mw-page-title-main">Blue catfish</span> Species of fish

The blue catfish is a large species of North American catfish, reaching a length of 65 in (170 cm) and a weight of 143 lb (65 kg). The continent’s largest catfish, it can live to 20 years, with a typical fish being between 25–46 in (64–117 cm) and 30–70 lb (14–32 kg). Native distribution is primarily in the Mississippi River and Louisiana drainage systems, including the Missouri, Ohio, Tennessee, and Arkansas Rivers, the Des Moines River in south-central Iowa, the Rio Grande, and south along the Gulf Coast to Belize and Guatemala.

<span class="mw-page-title-main">Triglidae</span> Family of fishes

Triglidae, commonly known as gurnards or sea robins, are a family of bottom-feeding scorpaeniform ray-finned fish. The gurnards are distributed in temperate and tropical seas worldwide.

<span class="mw-page-title-main">Black bullhead</span> Species of fish

The black bullhead or black bullhead catfish is a species of bullhead catfish. Like other bullhead catfish, it has the ability to thrive in waters that are low in oxygen, brackish, turbid, and/or very warm. It also has barbels located near its mouth, a broad head, spiny fins, and no scales. It can be identified from other bullheads as the barbels are black, and it has a tan crescent around the tail. Its caudal fin is truncated. Like virtually all catfish, it is nocturnal, preferring to feed at night, although young feed during the day. It generally does not get as large as the channel or blue catfish, with average adult weights are in the 1-to-2-pound range, and almost never as large as 4 pounds (1.8 kg). It has a typical length of 6–14 inches (15–36 cm), with the largest specimen being 24 inches (61 cm), making it the largest of the bullheads. It is typically black or dark brown on the dorsal side of its body and yellow or white on the ventral side.

<span class="mw-page-title-main">Barbel (anatomy)</span> Whiskerlike sensory organ near the mouth of a fish

In fish anatomy and turtle anatomy, a barbel is a slender, whiskerlike sensory organ near the mouth. Fish that have barbels include the catfish, the carp, the goatfish, the hagfish, the sturgeon, the zebrafish, the black dragonfish and some species of shark such as the sawshark. Barbels house the taste buds of such fish and are used to search for food in murky water.

Merodoras nheco is a species of freshwater ray-finned fish, it is the only species in the genus Merodoras of the catfish family Doradidae.

<i>Ictalurus</i> Genus of fishes

Ictalurus is a genus of North American freshwater catfishes. It includes the well-known channel catfish and blue catfish.

<i>Ictalurus pricei</i> Species of fish

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<span class="mw-page-title-main">Hardhead catfish</span> Species of fish

The hardhead catfish is a species of sea catfish from the northwest Atlantic and Gulf of Mexico, and similar to the gafftopsail catfish. It is one of four species in the genus Ariopsis. The common name, hardhead catfish, is derived from the presence of a hard, bony plate extending rearward toward the dorsal fin from a line between the catfish's eyes. It is an elongated marine catfish that reaches up to 28 in (70 cm) in length and 12 lb (5.5 kg) in weight. Their typical weight is less than 1 lb (450 g), but they commonly reach up to 3 lb (1.4 kg). They are often a dirty gray color on top, with white undersides.

Malapterurus beninensis is a species of electric catfish native to the African nations of Angola, Benin, Cameroon, the Democratic Republic of the Congo, the Republic of the Congo, Equatorial Guinea, Gabon, Ghana, Nigeria and Togo. This species grows to a length of 22 cm (9 in) SL. Its habitat is lowland marshes, rivers, and lakes.

<i>Synodontis schall</i> Species of fish

Synodontis schall, the Wahrindi, is a species of upside-down catfish widespread in northern Africa. This species is in the largest genus of the family Mochokidae. This species grows to a length of 49.0 centimetres (19.3 in) TL.

<span class="mw-page-title-main">Bullhead minnow</span> Species of fish

The bullhead minnow is a species of freshwater demersal fish, native to the Mississippi River system in the United States, to tributaries of Lake Huron and Lake Michigan and to northern Mexico.

Most fish possess highly developed sense organs. Nearly all daylight fish have colour vision that is at least as good as a human's. Many fish also have chemoreceptors that are responsible for extraordinary senses of taste and smell. Although they have ears, many fish may not hear very well. Most fish have sensitive receptors that form the lateral line system, which detects gentle currents and vibrations, and senses the motion of nearby fish and prey. Sharks can sense frequencies in the range of 25 to 50 Hz through their lateral line.

References

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