Online Resource 1. Image of the dorsal lobe of a thin-sectioned right otolith (0.5 mm thickness) cut along transverse plane (white dashed box of insert). Black dots indicate annuli identified.
The otolith was from a 1040 mm (fork length) female lake trout captured August 2, 2010 in Dease Arm of Great Bear Lake, Northwest Territories, Canada (complete thin-section in grey solid box insert). The age estimate was 48 years.