What was once just an attractive aquarium fish has recently become one of the biggest menaces in the atlantic. the lionfish was accidentally introduced into the atlantic ocean in the 1990s. because it has no natural predators, it has adapted quickly to its new home. the lionfish now threatens to destroy native fish populations in the atlantic, caribbean, and gulf of mexico. ^first p. g in the first paragraph, which line states a reason why humans are at fault for the lionfish problem? what was once just an attractive aquarium fish has recently become one of the biggest menaces in the atlantic. the lionfish was accidentally introduced into the atlantic ocean in the 1990s. because it has no natural predators, it has adapted quickly to its new home. the lionfish now threatens to destroy native fish populations in the atlantic, caribbean, and gulf of mexico.