"Whether you call it addiction or not, you can argue, but it's clear that methamphetamine changed how these animals behave," and those effects could potentially hinder their ability to find food, avoid predators and reproduce in the wild, Bossé noted. In regards to the new research, "it seems that the preference for meth dies down after just a few days," whereas if the fish were truly addicted, he'd expect that preference to persist over a longer period of time, he said. "I'm not sure you can truly say these fish are addicted to methamphetamine, but they certainly show a preference for the compound … which they shouldn't, really," said Gabriel Bossé, a postdoctoral research fellow at the University of Utah who was not involved in the study Bossé uses zebrafish as a model to study complex brain disorders and recently developed a technique to study opioid-seeking behaviors in the fish.
That said, an expert told Live Science that, even though the fish in the study sought out meth-tainted water, that may not be enough evidence to say they are truly "addicted."
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