Chemical substances typically released from endocrine glands, which travel through the bloodstream to targeted tissues, which are subsequently influenced by the hormone. go to glossary index

Chemical secretions produced by one of the endocrine glands and carried by the blood stream to another part of the body to stimulate functional activities.

chemicals produced by glands in the body to control actions of some cells and organs.

In the case of aquaculture, hormones are used as a synthetic substance for regulating the sex drive.