Heating mechanisms in some gamefish

While fish are generally considered to be cold-blooded, billfish and certain other pelagics including tuna have specialised physiological heating systems that generate sufficiently high temperature differentials in their eyes and brains that their visual acuity and certain brain functions are significantly improved compared to how these organs would function at ambient temperatures in normal seawater like most fish.

There are numerous research articles on this subject, and most of them use terminology and scientific jargon that make reading about it less interesting than watching grass grow... but the following article by a nature blogger named Barn Owl takes a (slightly) less scientific approach to this fascinating phenomenon which among other things, helps make your lures and skip baits just that little bit more attractive to marlin.

Click here to read this article