This review paper found that a significant number of fish die when caught at depth - the deeper the water, the more deaths that follow.
|1 to 3 metres||10% to 33%|
|6 metres||50% to 70%|
Blue rockfish, caught at 76 metres by anglers, caused the fish’s eyes to come out of their sockets by gases that expand inside the fish’s head as it is brought to the surface.
RAINBOW TROUT - THIRD DIE WHEN CAUGHT AT 1 TO 3 METERS
- HALF DIE WHEN CAUGHT AT 6 METERS
"Faccin (1983) reported that the mortality of rainbow trout ranged from 10 to 33% among fish confined at depths of 1 to 3 m compared to 50 to 70% among fish restrained at 6 m."
BLACK CRAPPIE - UP TO THREE-QUARTERS
DIE WHEN CAUGHT AT 6 TO 16 METERS
"Childress (1989) observed mortalities of 19 and 77% for black crappie caught from depths of 6 and 16 m, respectively."
BLUE ROCKFISH CAUGHT AT 76 METERS
- EYES FORCED OUT OF SOCKETS
"Gotshall (1964) reported that blue rockfish brought from depths of 76.2 m suffered from a "popeye" condition, in which gases in the skull expanded and forced the eyes out of their sockets. Insertion of a sharp object into the eye cavity at the juncture of the prefrontal and lacrimal bones usually relieved the condition, but caused greater mortality than nondeflation."