http://www.practicalfishkeeping.co.uk/p ... ?news=1720
Publishing their results in a recent issue of the Biological Journal of the Linnean Society, Frans Witte and co-authors measured fishes collected by bottom trawls in 1977–1981 and 1993–2001. The authors found that the total gill area of the fishes had increased by 64% in the span of two decades. At the same time, head length, eye length, and head volume decreased in size, whereas cheek depth and the depth of the levator posterior muscle (located dorsal to the gills) increased.
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