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Effects of Barometric Pressure on Fishing
Source: | Author:proe76f52 | Published time: 2012-09-19 | 2660 Views | Share:
Effects of Barometric Pressure on Fishing

Effects of Barometric Pressure on Fishing

By David Girdwood

The effect of barometric pressure on fishing feeding activity is one of the more interesting theories. In short, the theory proposes that a dropping air pressure brings on feeding activity, rising pressure turns the fish off feeding, high pressure results in the fish moving to shallower water, and low pressure results in fish moving to deeper water. This article will provide an overview on barometric pressure, summarize various theories about why atmospheric pressure affects fishing activity, and then summarize in tabular fashion the generally accepted fish behaviours with various barometric patterns.

Barometric pressure is the measure of the weight of the atmosphere above us. A barometer is used to measure air pressure. The earliest barometer consisted of a glass vacuum tube inserted into a container of mercury which was exposed to the pressure of the air. Increased air pressure would force the mercury up the tube in a height proportunal to the pressure. The height was measured in inches (inHg) or in millibars (1 inch = 33.864 millibars). Although new types of barometers are now used, these measures are still in place. In general, 30 inHg or 1016 millibars is considered to be normal air pressure. In normal weather, 30.5 is considered extreme high, and 28.5 is considered extreme low. The measures are taken at sea level, a higher elevation has less atmosphere above it, so a correction factor against the normal measure is needed depending on altitude.

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