Reason behind selection of sites of administration of pituitary extracts? There are two ways by which pituitary extracts are administered in a fish's body during induced breeding of fish. > Intramuscular injection is the most common practice in India and it is less risky in comparison with the other methods.The extract is injected into the muscle near the tail above the lateral line. > > Intra-peritoneal injections are given through the soft regions of the body, generally at the base of the pelvic fin or sometimes at the base of the pectoral fin. Why are these sites chosen? What physiological effects arise as a result of administration that these sites got chosen ?

> Intramuscular injections are usually preferred because they result in a more constant delivery of hormone and there is less chance of injuring the fish. The preferred site for an intramuscular injection is into the thick muscle of the back. This is because it is mostly used for fish movement and therefore has the most intensive blood circulation. Thus, injected hormone will be transferred thought the body quickly. Additionally, as this muscle is big, there is smaller chance to injure internal organs by the needle.

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