ISSN: 2041-6792

Clinical Investigation

Fish-reproduction

The methods of reproduction in fish are varied, and most fish lay many small eggs, fertilized and scattered outside the body. Pelagic fish eggs are usually left hanging in open water. Many coastal and freshwater fish lay eggs at the bottom or between plants. Some have sticky eggs. Mortality of young, especially eggs, is very high and often only a few individuals mature to hundreds, thousands, and in some cases millions of discarded eggs. Men produce sperm, usually as a milky white substance called feces, in two (sometimes one) testicles in the body cavity. In bony fish, spermatozoa lead from each testis to the urogenital opening behind the opening or anus. In sharks and rays, and in cyclostomes, water leads to the cloaca. Sometimes the pelvic fins change to help transfer the grace to the eggs on the female’s exhaust or on the substrate where the female has placed them. In some fish, the eggs are fertilized internally, but are hatched before development.    

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