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For example, a growth assessment of channel catfish in Lake A reveals fish are 6 inches at the end of their first year of growth (age-1), 8.5 inches after their second year of growth (age-2), and 11 inches after their third year of growth (age-3).
When born in natural habitats, by the time the fish are three to five years old, they reportedly weigh about 330 to 440 pounds (150 to 200 kilograms) [source: Mattson ]. These catfish manage to grow to such enormous sizes through a number of evolutionary tricks. We'll start with when the catfish are fry. Although full-grown adult Mekong giant catfish lack dentition and barbels (teeth and whiskers), not so with the fry. The next stage has only been observed in captivity, so there's no way to know if this happens all of the time.