Sexual or excretory organs

Here, President George W. White House photo by Eric Draper, public domain. Indecency should not be confused with obscenity. Obscenity refers to expression that receives no First Amendment protection. By contrast, indecency is often protected by the First Amendment, at least for adults.

The primary excretory organ in fishes, as in other vertebrates, is the kidney. In fishes some excretion also takes place in the digestive tract , skin, and especially the gills where ammonia is given off. Compared with land vertebrates, fishes have a special problem in maintaining their internal environment at a constant concentration of water and dissolved substances, such as salts. Proper balance of the internal environment homeostasis of a fish is in a great part maintained by the excretory system, especially the kidney. Marine fishes live in an environment in which the water around them has a greater concentration of salts than they can have inside their body and still maintain life. Freshwater fishes, on the other hand, live in water with a much lower concentration of salts than they require inside their bodies.

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The changes are rapid in intra-uterine life and around puberty but are much slower and gradual in other phases of the life cycle. On either side of the genital protrusion and groove are two ridgelike swellings labioscrotal swellings. Around the fourth week of life the gonads differentiate into either testes or ovaries.