Passage Summary: Scientists used to think deep-sea fish were blind to red, but a new discovery of a creature with red glowing 'fishing lures' suggests that some fish must be able to see that color.

Conclusion: Scientists should reconsider their current belief that deep-sea animals are unable to see red light.

Reasoning: A recently found deep-sea creature has red bioluminescent lights on its tentacles that likely serve as lures to catch prey.

Analysis: The conclusion is found in the first sentence, specifically the claim that scientists 'need to reassess' their view. I identified this by noting the contrast word 'but,' which signals a shift from a commonly held belief to the author's specific position. The subsequent sentences regarding the genus Erenna serve as evidence to justify why that reassessment is necessary.