The blue shark is one of the most recognized sharks. It has a distinct colour, a deep indigo blue and a vibrant blue on its sides. The large pectoral finsare also easy to spot as they are as long as the distance. The blue shark is a long slender shark, reaching 3.8 meters in length. There are many blues sharksin the summer, and some will come inshore into waist deep water, surprising the new groups of wading fly fishermen casting to stripers on Cape Cod's flats.The blue shark is a pelagic, or sometimes known as a open ocean, shark. It may be found in offshore surface waters in US near San Diego and northern BajaCaliforia. The blue shark's name comes from its unique dark blue dorsal surface and bright blue sides. Its ventral surface is a well-defined, crisp white color.Small bony fishes, and invertebrates, such as squid, cuttlefish and pelagic octopi, make up a most of the blue shark's diet. They easily feed on certainspecies of squid that form large breeding aggregations, which allows the blue shark to leisurely collect its unsuspecting prey. The blue shark is viviparous, andgives birth to live young. A litter can have as few as four and as many as 100 pups, depending upon the size of the mother. Mating occurs in the summer, thesprm being stored in the femal until the following spring when ovulation occurs and fertilization is effected. Only the right uterus is present in which 100or more embryos spend up to a year developing. The flesh of this species has an unattractive tate and the great blue shark is of little commericial value.