Biology

The second largest shark, reportedly reaching 1,220-1,520 cm TL (Ref. 247). Found on continental and insular shelves, offshore and often close to land, just off the surf zone; enters enclosed bays (Ref. 247). Swims slowly at the surface, usually in groups of 3 or 4 but a group of up to 100 has been reported (Ref. 6871). Found on the bottom of deep water during winter (Ref. 6871, 58302). Coastal-pelagic at 1 meter to unknown depths, probably epipelagic (Ref. 58302). Feeds by filtering copepods, barnacles, decapod larvae, and fish eggs from the water (Ref. 247). Ovoviviparous, embryos feeding on yolk sac and other ova produced by the mother (Ref. 50449). Regarded as ordinarily harmless and inoffensive but potentially dangerous if attacked (particularly when harpooned) (Ref. 247). Utilized fresh, frozen and dried, or salted (Ref. 9987). Also valued for its liver for oil, fins for soup, hide for leather and carcass for fishmeal (Ref. 247). May be a potential source of anti-carcinoma drugs (Ref. 6034, 6035). Used in Chinese medicine (Ref. 12166).