Alosa to detect ultrasound (at frequencies above 20 kHz, which is the limit of human hearing). This was first discovered by fisheries biologists studying a type of shad known as blueback herring, and was later verified in laboratory studies of hearing in American shad. This ability is thought to help them avoid dolphins that find prey using echolocation. "Alosa" species are generally pelagic. They are mostly anadromous or semianadromous with the exception of strictly freshwater landlocked species. "Alosa" species are generally migratory and schooling fish. Males usually mature about a year before females; they spawn in the late spring to summer.
Sea Fish Industry Authority Sea Fish Industry Authority The Sea Fish Industry Authority (or Seafish) is a non-departmental public body in the United Kingdom sponsored by the Department for Environment, Food and Rural Affairs. Established in 1981, and charged with working with the UK seafood industry to promote good quality, sustainable seafood. Seafish revised its mission in 2018. Its new mission is: "Seafood is the way Forward". Seafish was established in the United Kingdom under the Fisheries Act 1981 through the amalgamation of the Herring Industry Board (founded in 1934) and the White Fish Authority (founded in 1951). Seafish has its administrative base in