ARTHUR'S FREE FRESH

WATER FISH CLIPART

Free fresh water fish clipart, river fish images, lake fish illustrations, fishy photos. Of large size and format and is suitable kids, teachers, presentations, school projects and coloring books. The images are too large for use on web pages, however you can use the thumbnail images for the net. Selections of both colour and black and white clip art are available. Please feel free to use them anyway you wish for non commercial purposes only. Please do not include these in any other collections of clip art. To download a thumbnail left click on the picture and then "Save As" to a directory of your choice. To download the full size image, first right click on the thumbnail and then left click on the full size image and "Save As" to a directory of your choice.

                          

Fresh water fish arefish that spend the entirity or parts of their lives infresh water, such asrivers and lakes with asalinity of less than 0.05%. These environments differ from marine conditions in many ways, the most obvious being the difference in levels of salinity. To survive fresh water, the fish need a range ofphysiologicaladaptations in order to keep the ion concentration of their bodies balanced.41% of all known species of fish are found in fresh water. This is primarily due to the rapid speciation that the scattered habitats make possible. When dealing with ponds and lakes, one might use the same basic models of speciation as when studying island biogeography.

                              

Fresh water fish differ physiologically from salt water fish in several aspects. Theirgills must be able to diffuse water while simultaneously keeping the salts of the bodily fluids inside. The scales of the fish also plays a part in the scientific process;  fresh water fish that have lost too many scales get a surplus of water diffused in through the skin, causing the fish to die.Another trait characteristic of  fresh water fish are the well developed kidneys. These have to be large because a lot of water passes through them.

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Last updated May 2014