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Why Many Fish Species Are Getting Smaller

Research Reveals Warming Waters, Not Gills, Shrink Fish Size

Research Reveals Warming Waters, Not Gills, Shrink Fish Size
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Why are fish getting smaller as waters warm?

<p>A collaborative team of scientists led by the University of Massachusetts Amherst recently found that there is no physiological evidence supporting a leading theory&mdash; which involves the surface area of fish gills &mdash;as to why many fish species are &ldquo;shrinking&rdquo; as waters grow warmer due to climate change. Known as the Gill Oxygen Limitation (GOL) theory, it has been proposed as the universal mechanism explaining fish size and has been used in some predictions of future global fisheries yields. However, the researchers, representing the National Oceanic and Atmospheric Administration, U.S. Geological Survey, the University of California Davis as well as UMass Amherst, conducted a series of long-term experiments on brook trout and found that, though increased temperatures do lead to significantly decreased body size, gill surface area did not explain the change. The results of the study were recently published in the <a href="http://doi

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