No, bluegill fish are not warm-blooded. They are cold-blooded, or ectothermic, meaning they rely on external heat sources to regulate their body temperature.
Warm-blooded animals maintain a constant internal temperature regardless of the environment. Bluegills, like other fish, have activity levels and metabolic rates that fluctuate with the surrounding water temperature.
Bluegills are freshwater sunfish native to North America. They typically reach about 8 inches in length, are blue-green in color, and are popular with anglers because they readily bite on live bait and lures.