Scalloped hammerhead (Sphyrna lewini)
The Scalloped hammerhead shark (Sphyrna lewini) is listed as globally endangered on the IUCN’s Red List. Globally populations are facing decline due to the high economic value of its fins and the consumption of its meat. It is overfished during all stages of its lifecycle.
The Scalloped hammerhead is a circumglobal shark species native to coastal warm temperate and tropical seas. Its highly migratory nature, slow growth, and lengthy gestation period place this common bycatch species at risk to fishing practices on the high seas, at oceanic congregation sites, and throughout coastal birth zones.
Given these current fishing pressures, in addition to a lack of management strategies, high rates of capture poses a serious threat to the species survival. Because of difficulties in differentiating between species, estimates of trends in abundance are often grouped together. Best estimates indicate that Hammerhead shark populations have declined by 60-99% over recent years.
Threats to the Scalloped Hammerhead include overutilization, inadequacy of existing regulatory mechanisms, as well as other manmade threats.