Fish do not smell as we do. They have sense organs along their lateral line and in some species on barbels around their mouths and other areas too, that do the equivalent of smelling.
Pheromones are very important chemical messages that animals use to communicate to each other. Generally, pheromones tell animals of the same species a) the state of reproductive readiness (Male elk for example can tell if a female is ready to mate by smelling her urine to see if there are certain pheromones present indicating that she is ready) or b) the emotional state of the animal (sometimes fish release fear pheromones into the water to warn other fish of a predator) Pheromones are typically inhaled by animals, and the brain determines what the pheromone means. Even humans can interpret what a pheromone means, even though we are not really aware that we are smelling a pheromone.
Animals use pheromones to communicate with each other by signaling information about mating, territory marking, and warning signals. Pheromones help animals identify members of their species, locate suitable mates, and establish social hierarchies within their groups.
males use a protein to detect pheromones sent by females
Ants use pheromones for communication.
There are four types of pheromones in humans: Releaser pheromones, Primer pheromones, Signaller pheromones and Modulator pheromones. These hormones have roles in a wide range of human functions including sexual attraction and the transmission of information.
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Moths used pheromones to locate mates. A female moth will release them into the air for a male to detect with those feathery looking antennae.
Military or social, ants use pheromones to colonize, so do bees...
They are pheromones.
Plant pheromones are collected by taking the flower off the plant, and then extracting the pheromones. This is usually done in a laboratory environment.
Female urine contains male-attracting pheromones...
The opposite of pheromones would be substances that inhibit or mask the effects of pheromones, potentially disrupting communication or attraction signals between organisms.