endotherm
Nick Wegner (Southwest Fisheries Science Center) is pictured here holding an opah. Image Credit: NOAA Fisheries, Southwest Fisheries Science Center
The opah (Lampris guttatus), otherwise known as a moonfish, lives in the deep sea where warm blood can be advantageous. According to a quote from Nicholas Wegner (NOAA) posted in Live Science, "Increased temperature speeds up physiological processes within the bod. As a result, the muscles can contract faster, the temporal resolution of the eye is increased, and neurological transmissions are sped up. This results in faster swimming speeds,…