"Fish with large bladders quickly sense when the air pressure is dropping, because there's less pressure on their bladder. However, many things they eat have air bladders, and that alone could have a big impact on where you might find them and how they'll behave. They don't sense the pressure changes as dramatically, so their comfort levels aren't drastically altered. "That's because fish with small bladders have a body density that's closer to that of the surrounding water. "Fish that have small air bladders, such as kings, Spanish mackerel, wahoo and dolphin, aren't as affected by barometric changes as those with large bladders, such as trout, redfish, tarpon, grouper and snapper," he says. While Woodward admits that there's no definitive answer for how a rising or falling barometer affects fish behavior, he has some thoughts based on his decades of marine research and some 15 years of tournament fishing.Īccording to Woodward, a fish senses pressure changes through its air bladder, and well in advance of humans. When high pressure settles over an area, it often means bright days and relatively calm seas.Īll this is very interesting, of course, but how does barometric pressure affect fish? To find out, I consulted Spud Woodward, Assistant Director for the Georgia Department of Natural Resources Coastal Resources Division and an avid king mackerel and red drum fisherman. Conversely, high atmospheric pressure usually arrives after the passage of such a weather system. Baig, a barometer reading of 30.71 (1040 millibars) is a typical winter reading for a high-pressure, cold-air cell moving out of northern Canada, compared to the typical average annual pressure of 29.7 (1013 millibars) in Miami.Īs a very general rule, approaching weather systems - such as cold and warm fronts, tropical waves and rain - are usually associated with low atmospheric pressure. Strong high pressure could register as high as 30.70 inches, whereas low pressure associated with a hurricane can dip below 27.30 inches (Hurricane Andrew had a measured surface pressure of 27.23 just before its landfall in Miami Dade County).Īccording to Dr. Hg.A barometer reading of 30 inches (Hg) is considered normal. When the air pressure drops, so does the mercury level."Ītmospheric pressure can also be measured in millibars (mb), with a "bar" being roughly equivalent to one atmosphere of pressure (one atmosphere equals 1.01325 bars). When the air pressure rises, it pushes the mercury higher. "At one end is liquid mercury, whereas the other end is open to the atmosphere. It is instrumental in weather observations, since its fluctuation indicates the movement of weather fronts and systems.Liquid mercury (Hg) is commonly used in a barometer to measure air-pressure changes in inches (in.). Stephen Baig, an oceanographer at NOAA's Hurricane Center in Miami, barometric pressure is defined as the weight or mass of an entire air column on a unit of surface area at sea level. Blackfin tuna had brought life back to Hatteras Village.Īccording to Dr. How many times have you enjoyed a red-hot bite before an approaching storm or frontal system, or watched the action mysteriously shut down upon the arrival of bad weather? And how many days did it take for the fish to turn back on after the passage of that storm or front?Īlmost overnight, the docks were bustling tackle shops were selling out of jigging gear, and the charter fleet was called into duty.
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