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It is normal for penguins to stack on some "healthy baby chub" after they hatch, the aquarium's Jacinta Early tells the BBC, but keepers had no idea Pesto would become so immense.

Shortly after some removals, arroyo chub, another native fish, started moving upstream, Jacobson said.

The silver chub isn't considered sensitive to climate change on a national scale, but context matters.

As a result, conservation groups sued the agency, saying it would potentially harm sage grouse, a species whose population is listed as "sensitive," as well as the Owens tui chub, an endangered fish.

It’s the latest tactic in an ongoing struggle to keep non-native smallmouth bass and green sunfish at bay below the Glen Canyon Dam and to protect a threatened native fish, the humpback chub.