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Very Fishy
Very Fishy
Started by Butterfly, October 01, 2009, 02:47:38 AM
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Very Fishy
October 01, 2009, 02:47:38 AM
Very Fishy
A.E. Brain
By Zoe Brain
30 September 2009
http://aebrain.blogspot.com/2009/09/very-fishy.html
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Intersex occurrence in freshwater fishes was evaluated for nine river basins in the United States. Testicular oocytes (predominantly male testes containing female germ cells) were the most pervasive form of intersex observed, even though similar numbers of male (n = 1477) and female (n = 1633) fish were examined. Intersex was found in 3% of the fish collected. The intersex condition was observed in four of the 16 species examined (25%) and in fish from 34 of 111 sites (31%). Intersex was not found in multiple species from the same site but was most prevalent in largemouth bass (Micropterus salmoides; 18% of males) and smallmouth bass (M. dolomieu; 33% of males). The percentage of intersex fish per site was 8–91% for largemouth bass and 14–73% for smallmouth bass.
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