For many fish species is characterized by clear division of the sexes and, as a consequence, sexual reproduction. Interestingly, some fish are polygamous and others monogamous. But perhaps the most curious fish are hermaphrodites. It's hard to believe, but some of these fish can do throughout your life to change gender several times. That individual can function in both female and male. Usually the fish is traceable sequential hermaphroditism, which can affect both the environment and some changes in their populations.
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There are fish are hermaphrodites that start their lives are males, and later undergo a radical metamorphosis of their reproductive system, turning into fully functional females. Here it is a question of preteendigestcom hermaphroditism. For example, this form of hermaphroditism have members of the family of groupers. A striking example of such transformations could be found in the marine wrasses: all males with age are transformed into females.

However, in the family of the wrasses observed the reverse process: when you need to and females can take place of the missing males. This happens if the group Gubanov, remove the male. In this case, the strongest female will show male behavior, and within two weeks her reproductive system is changing dramatically, starting to produce male sex cells.
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Hermaphroditism fish may be not only natural but artificial, occurring under the influence of any chemicals. For example, the American scientists from the U.S. Geological survey who have studied the basins of major rivers of the United States, came to the conclusion that in certain American rivers came fish mutants, which are bisexual. It turned out that hermaphrodites, mutants are both Smallmouth and largemouth perch. Scientists have identified the main habitats of these fish, the Mississippi river, Llamp, Colombia, Colorado, Pee Dee, Rio Grande, Colorado, and Apalachicola.

Biologists from the state geological research center in the United States believe that this phenomenon is not due to the natural activity data of the fish. According to them, there is a suspicion that hormonal alteration of these creatures was influenced by deceptive chemical signals in their body. It should be noted that some scholars who have previously argued that these fish change their gender under the influence of various chemicals, do not exclude the possibility of influence on them of other factors, because some of these creatures are generally found in fairly clean waters.