It should be skinned and soaked as soon as possible because blue sharks excrete urea through their skin and the taste must be purged from the meat. Blue sharks are most often caught by chumming the area and then setting out bait lines. The blue shark has course skin and tend to roll up in the line when hooked, so it is imperative that you use steel leader when fishing them. Thresher shark Thresher sharks inhabit the upper layers of deep offshore waters and are most abundant along the edges of the continental shelf. Thresher sharks occur worldwide in warmer seas and in the Eastern Pacific can be found from the Strait of Juan de Fuca, British Columbia to Central Baja California.
Thresher sharks feed upon small fish such as anchovies, mackerel, and squid.
They use their long tail, which is as long as their body, to flail and stun prey. They bear their young live and produce 4 pups annually. Threshers are a large shark that commonly reach 15' in length. Thresher sharks are most plentiful off the California coast during the summer. The best localities to fish have been off the coast near San Francisco.