Fish reproductive organs include testes and ovaries. In most species, gonads are paired organs of similar size, which can be partially or totally fused. The genital papilla is a small, fleshy tube behind the anus in some fishes, from which the sperm or eggs are released; the sex of a fish often can be determined by the shape of its papilla. Most male fish have two testes of similar size. In the case of sharks , the testes on the right side is usually larger [ citation needed ]. The primitive jawless fish have only a single testis, located in the midline of the body, although even this forms from the fusion of paired structures in the embryo.
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Sperm are made in the testicles. To reach the penis, they travel along the narrow tube of the epididymis which lies just outside the testicles and then along larger tubes one from each testicle. These tubes join together and go through the prostate gland to the penis. The journey distance is about 6 metres because the epididymis tube is very tiny and tightly coiled , and can take up to 3 weeks. They are ejaculated from the urethra, the same tube that carries urine out of the penis.
We have already seen that, even in humans, there is more to this substance than meets the eye. It contains proteins that, when mixed together, can forge a mating plug. But this list of ingredients is just the tip of the iceberg. Even in the ejaculate of the lowly banana fly Drosophila melanogaster , researchers have identified no fewer than different kinds of proteins.
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