US Orca Pacific orca population record

Index

Record/What Is Killing Them/Entanglement & Ship Strikes

02 — What Is Killing Them

Entanglement & Ship Strikes

Entanglement & Ship Strikes

Less common than the other three, and lethal when it happens.

Severity scorecard

Scored 2026-09-07

Severity rating

2 / 5 · Low

Trend
Flat
Mechanism
Medium confidence
Lag to effect
1–3 yr
Scored
1 July 2026

What would move thisDerelict gear recovery funded every season instead of every third season.

Assessment

Orcas are entangled less often than humpbacks or grey whales, but derelict gear, crab pot lines and lost net remain a real hazard along the coast. A single entanglement in a population of seventy-four is a measurable loss.

Ship strikes are rarer still and harder to document, since a struck animal usually sinks. Necropsies occasionally reveal blunt trauma consistent with a vessel collision in whales that were assumed to have died of other causes.

Both threats respond well to unglamorous work: gear recovery programmes, better marking standards, and keeping large vessels out of known foraging areas during peak season.

Plate. Entanglement & Ship Strikes — documentary reference for the pressure described here.

Key points

6 observations
  • 01Derelict gear persists for decades
  • 02Crab pot lines a recurring hazard
  • 03Ship strikes usually go undocumented
  • 04Necropsies reveal blunt trauma
  • 05Gear recovery is proven and cheap
  • 06Seasonal exclusion zones help