Something to ponder, while enjoying your plate of sumptuous tuna meal!
* Yellowfin remain 180 to 330 feet below the surface 80% of daylight hours. They spend only 6% of their time within 90 feet of the surface during this time frame.
* They travel and feed in waters as cold as 60 degrees and warm as 80 degrees.
* Yellowfin change colors when aroused; whether it be fighting at the back of a boat, feeding, or mating.
* Yellowfin do not show a definitive temperature preference as long as water temperatures were within their comfort range of 68 to 75 degrees F.
* They swim faster in cold water and slower in warm water.
* Yellowfin swim closer to the surface at night then they do during the day.
* They average an hourly swimming speed of 8.4 feet per second. Their average sustained swimming speed (4 to 10 hour measurements) is 4.1 feet per second.
* Scientific theory suggests yellowfin move up and down in the water column searching for odor trails of baitfish and to help regulate their body temperature.
* Migratory yellowfin make fewer vertical movements and maintain lower depths than feeding fish.
* They demonstrate predictable swimming patterns that differ between night and day.
* Yellowfin can navigate via a magnetic based sensing organ located in their skull.
* They are able to know their exact position relative to fixed objects or topography 10 miles away.
* During daylight hours, they associate with topography; banks, ridges, seamounts, FADS, etc. Late in the afternoon, they move away from their reference point or landmark and begin a circular and sometimes twisting searching pattern at an average of 5 knots from their starting point. By dawn, they are already at, or enroute to their starting point or landmark.
* Yellowfin have an internal clock. Migratory patterns show that at 2:00am.
* Their eyesight and sense of smell are well developed and superior to most fishes.
* They respond well to splash, low frequency vibration, and visual stimulus.
* Yellowfin are both trainable and smart.
