One might assume it’s because older fish simply have more time to grow exceptionally large, but with the mekong catfish that’s not the case. They actually do most of their growing as hatchlings. Simply put, they become so large because they eat constantly. Although after about a year the fish are toothless herbivores, they have teeth for the first couple weeks of life and have been observed cannibalizing one another, and they eat continuously their entire lives. They can weigh 330 to 440 pounds by four or five years of age.
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