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to particular pathogens recognised by the fish's body, i.e., an immune response.[38] In recent years, vaccines have become widely used in aquaculture and also with fish, for example furunculosis vaccines in farmed salmon and koi herpes virus in koi.[39][40] The brain stem or myelencephalon is the brain's posterior.[17] As well as controlling some muscles and body organs, in bony fish at least, the brain stem governs respira Most fish possess highly developed sense organs. Nearly all daylight fish have color vision that is at least as good as a human's. Many fish also have chemoreceptors that are responsible for extraordinary senses of taste and smell. Although they have ears, many fish may not hear very well. Most fish have sensitive receptors that form the lateral line system, which detects gentle currents and vibrations, and senses the motion of nearby fish and prey.[19] Some fish, such as catfish and sharks, have organs that detect low-level electric current.[20] Other fish, like the electric eel, can produce electric current.The best known of these are the Bluestreak cleaner wrasses of Fish orient themselves using landmarks and may use mental maps based on multiple landmarks or symbols. Fish behavior in mazes reveals that they possess spatial memory and Experiments done by William Tavolga provide evidence that fish have pain and fear responses. For instance, in Tavolga?s experiments, toadfish grunted when electrically sho In xxxx, Scottish scientists at the University of Edinburgh and the Roslin Institute concluded that rainbow trout exhibit behaviors often associated with pain in other