Sharks are vulnerable animals and their slow growth, late maturity and small number of offspring make them especially susceptible to overexploitation, and the species is slow to recover once depleted.

• 鲨鱼其实很脆弱，加上成长速度慢，性成熟时间晚及后代数目不多，使得在过度捕捞下更容易受害，一旦变少，恢复物种数量速度也很缓慢。