![]() In the case of larger feeding fish, two lines of bubbles may sometimes be observed, one emanating from each gill, although it’s not always evident. Pinpointing fish bubblesīubbles produced by the physical feeding process and depth regulation tend to be relatively large and short lived, that is they ‘pop’ shortly after breaking surface. Watercraft comes with experience, and the more you study the water the better you get, but there are some clues to help you on the way. Release of bubbles through the gills is part of the sorting process, whereby fish separate food from non-food items, and depth regulation mechanisms often require fish to release gas from their swim bladder as they rise in the water.ĭifferentiating between those bubbles created by fish and those arising from natural means is part of the learning process. In addition to bacterial generation of gases within the substrate, bubbles are also formed by the feeding and regulatory processes of the fish themselves. It varies from oxygen to methane and to the noxious, rotten-egg-smelling hydrogen sulphide.īut to watching anglers, the chemistry is largely irrelevant, it is simply the act of bubbling that suggests a fish is present. The nature of the gas released varies depending upon the nature of the substrate, particularly whether the breakdown is aerobic or anaerobic. ![]() The steady accumulation of gas trapped in the substrate releases naturally, too, without any form of disturbance, often making the angler think a fish is responsible when it’s not.īubbling is certainly more prevalent in areas of organic matter, such as silt, where bacterial activity is at its greatest, but it is common over hard gravel substrates, too. ![]() These result from bacterial breakdown of organic matter, and any disturbance of the substrate, be that by fish, wildfowl or water movement, cause it to be expelled and bubble up to the surface. ![]()
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