Britannica
Sources used in this answer
Why do most shark species recover slowly after population declines?
Created from Britannica articles
using AI.
AI can make mistakes, so verify using Britannica articles.
shark
Shortfin mako shark (Isurus oxyrinchus), found throughout tropical and temperate seas worldwide.
Most shark species recover slowly from population declines primarily due to their low reproductive rates compared to many other fishes. Unlike many fish that produce thousands or millions of eggs with high mortality rates, most sharks produce very few offspring at a time.1234
Several biological factors contribute to this slow recovery:
- Late Maturity: Sharks often take many years to reach sexual maturity, meaning they do not begin reproducing until later in life.24
- Low Fecundity: While some species like blue sharks can produce larger litters, most shark species bring forth fewer than 10 offspring.24
- Long Gestation: Reproduction is viviparous or ovoviviparous in many species, with gestation periods often lasting around 12 months.52
Because of these life-history traits, shark populations lack the capacity to reconstitute their numbers quickly following sudden declines caused by fishing pressure or other threats. Protecting these apex predators is an ethical imperative, as their removal can trigger ecological collapses and domino effects throughout marine food webs.24