The mouth is turned upwards which helps with feeding as they consume food from the surface. There are at least three native fish species endemic to Periyar Lake and the rising catfish populations could affect them.. Alligator gar in Keralas waters could indeed be a potential concern because the species is primarily carnivorous and can feed on native fish, said V. S. Basheer, principal scientist at KochisNational Bureau of Fish Genetics Resources(NBFGR). Tankbusters fish that are capable of outgrowing most domestic aquaria are a problem too. No new licenses should be given to farms for importing alien species, he added. Once it does, we can get information on new occurrence records again.. Both species are also top predators in their native habitats, feeding on smaller fish (which puts Keralas small native species at risk). Clear definitions of when a species is invasive in the real sense and causes ecosystem- and fisheries-level impacts are also crucial, he said. While tiny swordtails and the giant gourami (both fugitives of the ornamental fish industry) have established themselves in some rivers and streams of Kerala but are not invasive, the same cannot be said of the African catfishClarius gariepinus. Arapaima is a large fish which is native to the Amazon River in Brazil. Their dorsal and anal fins are located far back on the body, giving the posterior end of the animal a large, flattened appearance. The team called for an urgent need to develop and implement a nationwide alien species management and eradication scheme. Mongabay Series: Conserving Agro-biodiversity. His journey, however, was not in vain; he was able to procure a small piece of fish tissue from the head. To be billed as an invasive, the species must proliferate to unnatural abundances in the habitats where they get naturalised, and also outcompete other species, he wrote in an email. * The arapaima fish from Amazon can grow to gain 200 kg, while alligator gar of the US can weigh 137 kg. Temperature: Arapaima live best from about 75 to 80-degrees F. with 78 being perhaps ideal. Their large scales are tough for predators to break through. But though neither of the fish seems to have established sustaining populations in any of these river systems, their presence here is still a cause for concern, claims Kumar, professor and head of the Department of Aquatic Biology and Fisheries at the University of Kerala. The panoramic view of the monsoon clouds over the Chalakudy River. Alligator gar in Keralas waters could indeed be a potential concern because the species is primarily carnivorous and can feed on native fish, said V. S. Basheer, principal scientist at Kochis National Bureau of Fish Genetics Resources (NBFGR). However, there are no studies on the actual impacts these species could have on freshwater systems in India. Fishing for sale in Kerala. To be billed as an invasive, the species must proliferate to unnatural abundances in the habitats where they get naturalised, and also outcompete other species, he wrote in an email. Sergio Ricardo de Oliveira. This species could have a bigger chance to proliferate in Keralas freshwater habitats than the arapaima, he says. Dwelling from the Amazonian basins of South America, these bonytongues can reach a length of up to three metres and weigh upwards of450 pounds.. Arapaimas are important food fish in South America.Therefore, several farms breed them in large quantities. 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