Gurnards belong to a group of fish known collectively as Triglidae (sea robins). Grey gurnard occurs in the eastern Atlantic from Iceland, Norway, southern Baltic, and North Sea to southern Morocco, and Madeira Islands. It is also found in the Mediterranean and Black Seas. In the North Sea and in Skagerrak/Kattegat, grey gurnard is an abundant demersal species. They have a strong seasonal migration throughout the North Sea. It forms dense semi-pelagic aggregations in winter to the northwest of the Dogger Bank; in summer, grey gurnard are more widespread. The species is less abundant in the English Channel, the Celtic Sea, and in the Bay of Biscay. Although an offshore species, grey gurnard is occasionally found in shallow water. They spawn from April to August in deep water. The maximum life span rarely exceeds 6 years. They can attain a length of 45 cm, but are usually around 30 cm. Sexually mature at a length of about 18 cm and an age of 3 years (males) and about 24 cm and 4 years (females).Gurnards are able to grunt or growl by the use of muscles associated with the swim bladder, and this is believed to aid in keeping schools together.Increased consumption and demand for the species will alleviate the need to waste fish through the practice of discarding, but efforts must be made to understand the biology of the stocks and manage them appropriately, if the species are to become commercially targeted. Grey gurnard is a fast growing fish and matures early at a large size. Avoid eating immature fish (less than 24cm) and fresh (not previously frozen) fish caught during the spawning season (April-August).