All seven sea turtle species are threatened or endangered, with bycatch in commercial fisheries being a leading cause of mortality alongside nesting habitat loss.
Sea turtles caught on longlines experience prolonged struggling, oxygen depletion and exhaustion. Entanglement in ghost fishing gear causes slow drowning. Ingestion of plastic bags mistaken for jellyfish causes intestinal obstruction and starvation. Temperature-dependent sex determination makes sea turtle populations vulnerable to climate-driven sex ratio skew.