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   Channa marulius (fish)   
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    Taxonomic name: Channa marulius (Hamilton, 1822)
    Synonyms: Channa marulia (Hamilton, 1822) , Channa marulius ara (Deraniyagala, 1945), Channa marulius (Hamilton, 1822), Ophicephalus grandinosus (Cuvier, 1831), Ophicephalus leucopunctatus (Sykes, 1839), Ophicephalus marulius (Hamilton, 1822), Ophicephalus sowara (Cuvier, 1831), Ophiocephalus aurolineatus (Day, 1870), Ophiocephalus grandinosus (Cuvier, 1831), Ophiocephalus marulius ara (Deraniyagala, 1945), Ophiocephalus pseudomarulius (Günther, 1861), Ophiocephalus theophrasti (Valenciennes, 1840)
    Common names: ara (Sinhalese-Karnataka), Augenfleck-Schlangenkopf (German-Germany), avalu (Kannada-India), aviri (Andhra Pradesh), aviu (Karnataka), bhaura (Nepali-Nepal), bhor (Bihar), bohr (Hindi-India), bral (Kerala), bullseye snakehead (English), chaeru-veraal (Tamil Nadu), coaree Veralavuree (Tamil-India), cobra snakehead (English), curuva (Kerala), dowlah (Punjab), gajal (West Bengal), gajar (Bengali-Bangladesh), gangara (Sinhalese-Sri Lanka), giant snakehead (English), gozar (Bengali-Bangladesh), great snakehead (English), haal (Pakistan), hoovina-mural (Kannada-India), Indian snakehead (English), intiankäärmeenpää (Finnish-Finland), iru viral (Tamil-Sri Lanka), kæmpe-slangehovedfisk (Danish-Denmark), kalamasa (Marathi-India), kalumaha (Sinhalese-Sri Lanka), kubrah (Bihar), madinji (Karnataka), maral (Marathi-India), murrel (English), ngamuporom (Manipuri-India), nga-yan-daing (Burmese-Myanmar), pa gooan (Lao-Lao People's Democratic Republic), pa kouan (Lao-Lao People's Democratic Republic), pba gooa (Lao-Lao People's Democratic Republic), phoola-chapa (Andhra Pradesh), phool-mural (Andhra Pradesh), pla chon ngu hao (Cambodia), pla tjon gnoo aow (Thai-Thailand), pool-a-malle (Telugu-India), poomeenu (Orissa), pumuri (Hindi-India), pumurl (West Bengal), puveral (Tamil Nadu), saal (Punjab), sal (Assam), saul (Nepali-Nepal), saura (Nepali-Nepal), sawal (Punjab), sawl (Punjabi-India), soal, trey raws (Sri Lanka), vral (Malayalam-India), zmeegolov-maruliy (Russian-Russian Federation)
    Organism type: fish
    Little if any documentation is available on the effects of the bullseye snakehead (Channa marulius) on native fish populations. As a predator it may affect native ichthyofauna and subsequently disrupt native food webs. It's only recorded country of introduction is the USA.
    This snakehead species is an elongated fish, with a long dorsal fin, tubular nostrils and an ocellus near the base of the upper part of the caudal fin. There is no patch of scales on the gular region of the head. Lateral line scales drop two rows between the 16th and 18th perforated scale. Scale rows between the posterior margin of orbit and preopercular angle 10 degrees. Scales on top of the head are moderate-sized with a rosette of head scales between the orbits, with the frontal head scale in the center of the rosette. There are two scales between the rosette and the basal head scale, 10 scale rows between the propercular angle and posterior border of orbit, and the pectoral fin length is about half of the head length (Courtenay & Williams 2004). There is a distinctive orange spot on the caudal peduncle (Fuller 2009). This species has a large mouth, having a lower jaw containing seven to 18 canines behind a single row of villiform teeth that widen to five to six rows at jaw symphysis (Courtenay & Williams 2004). It has some of the largest teeth of any snakehead (Howells 2004). Teeth are present on prevomer but are absent on palatines. Juveniles may have a series of dark blotches along the sides, margined posteriorly and posterodorsally by a series of white scales. It is reported to be the largest species of the family Channidae, reaching a length of 120 to 122 centimeters. Talwar and Jhingran (1992, in USGS 2008) reported that it grows to 180 cm and a weight of 30 kg in Maharashtra State, western India, noting that a length of 30 cm can be attained in 1 year, however, Rohan Pethiyagoda and Prachya Musikasinthorn (Pers. Comm. 2002, in USGS 2008) stated they doubted that any snakehead would reach such a length and were unaware of any specimens of that size. Growth decreases with increasing age, with the greatest increase in weight occurring during the second year. In its native range it has been reported as having reached up to 60 pounds (Howells, 2004). The young are facultative airbreathers whereas the adults are obligate breathers. A peak in oxygen uptake has been exhibited at night. This species has been cited as being one of the two fastest growing snakeheads.
    Similar Species
    Batrachops spp., Channa spp., Crenicichla spp., Amia calva

    Occurs in:
    lakes, water courses, wetlands
    Habitat description
    Channa marulius occurs in sluggish or standing water in rivers, canals, lakes and swamps. It tends to inhabit waters with submerged aquatic vegetation and is usually found only in deep pools in rivers and occasionally in lakes. It also enters flooded forests. The ideal temperature for this species is in the tropical range of approximately 24°C to 28°C (Pethiyagoda 1991). This species can exist in tropical, subtropical and warm temperate climates (Courtenay & Williams 2004). In a study by Lief-Mattias (2007), the mean air temperature was found to be the most significant environmental variable in regard to habitat suitability. This would help to explain the more tropical distribution of C. marulius, compared to other snakeheads like C. argus, that have also invaded the United States.
    General impacts
    Predation: Snakeheads are highly predatory and some have the ability to travel overland to new bodies of water. The bullseye snakehead is considered predacious (Jhingran 1984, Talwar & Jhingran 1992, in Hoffman 2002), especially on other fishes (Schmidt 2001, in Hoffman 2002). It also has the potential to impact native crustaceans through predation (Fuller 2009). In one stomach contents analysis study (N=127) it was found that the bullseye snakehead consumes its own species, bluegill, mosquitofish, warmouth, peacock bass, lizards, bufo toads, small turtles, a rat and a snake (Cocking 2008, in Fuller 2009).
    Human health: Males, being territorial, will bite when they are caught (FishBase 2008c).
    This fish is an important commercial, aquaculture, game and aquarium fish in various regions (FishBase 2008c). The bullseye snakehead has been cultured in ponds, ricefields, and irrigation wells that do not support other fishes. Ebanasar (1995) conducted a series of experiments on the biology, physiology and culture of this fish. It is reported that this fish is highly suitable for cage cultute and culture in ponds in combination with tilapia. It is found to be an effective tool in controlling the overpopulation of tilapia and thus checks stunted growth of tilapia. They are cultured as game fish in their native range because they put up a strong fight when hooked. Some snakeheads are highly valued as food fish, particularly northern snakehead (Channa argus), blotched snakehead (Channa maculata), Chinese snakehead (Channa asiatica), bullseye snakehead (C. marulius) and chevron snakehead (Channa striata) (Herborg et al. 2007).
    Geographical range
    Native range: The bullseye snakehead is native to Asia from India to China, south to Thailand and Cambodia and Pakistan (Fuller 2009).It is native to Pakistan (Kabul and Indus Rivers; Mirza 1999, in USGS 2008); many drainages of India, Sri Lanka, Bangladesh, southern Nepal (Gandaki, Koshi, and Karnali River basins), Myanmar, Thailand, Mekong basin of Laos and Cambodia, and southern China (Day 1877, Nichols 1943, Mendis & Fernando 1962, Qureshi 1965, Fernando & Indrassna 1969, Pethiyagoda 1991, Talwar & Jhingran 1992, Rainboth 1996, Kottelat 2001a, in USGS 2008).
    Known introduced range: This snakehead is found in many residential lakes and canals in Broward County, Florida (USA) (Fuller 2009).
    Introduction pathways to new locations
    Live food trade: It is highly valued throughout Asia for its taste, so it is likely spread through the live food trade (Helias, 2002).
    Pet/aquarium trade: This species has been known to be cultured for food and/or aquarium fish trade (Courtenay & Williams 2004).
    Pet/aquarium trade: According to Fuller (2003), Channa marulius was found in Maryland due to probable aquarium release.

    Local dispersal methods
    Other (local): Channa marulius has the ability to move over land for short distances (Helias, 2002).
    Management information
    The potential to eradicate or control snakehead populations depends on where they are found; if established in large lakes or river systems, eradication or control is expected to be nearly impossible; control in smaller water bodies depends upon the amount of vegetation, the accessibility to the water body, and the effectiveness of the control methods (Hoffman 2002).

    Preventative measures: Areas surrounding the Gulf of Mexico, as well as large parts of Mexico itself, provide suitable habitat for establishment of Channa marulius (Lief-Mattias 2007).

    The US Fish and Wildlife Service placed all snakehead fish in the Channidae family including C. marulius, on the federally regulated list of injurious fish in 2002, meaning their importation into or transportation between the continental United States and other territories in possession of the US is unlawful (Hoffman 2002).

    Decision support tools for identifying potentially invasive non-native marine and freshwater species (fish, invertebrates and amphibians) have been adapted from Pheloung Williams and Halloy (1999) Weed Risk Assessment tool and are available online.

    Decision support tools for identifying potentially invasive non-native marine and freshwater species (fish, invertebrates and amphibians) have been adapted from Pheloung Williams and Halloy (1999) Weed Risk Assessment. Please follow this link to access the decision support tool and kit.
    A Risk-assessment for non-native freshwater species in the UK is available for determining the level of potential invasion The assessment can aid resource managers in decision making when it comes to management strategies.

    Chemical: Piscicides work by preventing fish from removing oxygen from the water. Chemical control using Rotenone and similar toxins would likely be ineffective to air breathing snakeheads and damaging to nontarget organisms except in closed situations.

    Physical: Electrofishing and netting may provide some level of control of snakehead populations; however, eradication using these methods would be too selective for [larger] size classes to remove a population of snakeheads.

    Biological: Snakeheads are preyed upon by peacock bass and largemouth bass (Fuller 2009).

    The bullseye snakehead fish is regarded as predacious, especially on other fishes. They cannot coexist in aquaria with other fish, including, bullseye snakeheads, once they have reached a length of 25 cm (Courtenay & Williams 2004). Dasgupta (2000, in USGS 2008) reported stomach contents of C. marulius collected from several localities in West Bengal, India, as consisting primarily of fishes (40%), followed by crustaceans (30%), macrophyte (15%), larval insects (10%), and algae (5%). Ahmad and others (1990, in USGS 2008) stated the diet of C. marulius in the River Kali, northern India, was more than 60 percent fishes and the remainder crustaceans, gastropods, insects, and larval chironomids.
    According to Agbayani (2002), the bullseye snakehead builds floating nests of weeds and leaves where orange-yellow eggs are deposited. The typical brood size of C. marulius is about 500 young, and is guarded by the parents until they reach about 10 cm in length. The eggs hatch within 54 hours at 16°C to 26°C and 30 hours at 28°C to 33°C. Breeding occurs through most of the year and can vary slightly depending on location (Courtenay & Williams 2004).
    Reviewed by: Expert review underway: Dr. Walter R. Courtenay, Research Fishery Biologist, Center for Aquatic Resources Studies, USGS Florida Integrated Science Center USA
    Compiled by: Profile revision: National Biological Information Infrastructure (NBII) & IUCN/SSC Invasive Species Specialist Group (ISSG)
    Last Modified: Sunday, 24 May 2009

ISSG Landcare Research NBII IUCN University of Auckland