Do fish change color after they go into shock?

Yes, fish can change color when they go into shock due to stress or environmental changes. This color change is often a response to stressors such as low oxygen levels, temperature fluctuations, or handling. The change is typically caused by the contraction or expansion of pigment cells in their skin, which can either darken or lighten their appearance. Additionally, some species may display warning colors or patterns in response to distress.