[troutman]

Originally Posted by Poe969

When you go fishing, if it's going well you usually try to fish as long as you can and keep the bigger fish. Trophy fishing. If you let a previously caught fish go in order to keep a bigger fish and the original fish dies, what is that considered?

Culling. Illegal.

http://www.albertaregulations.ca/fishingregs-pdfs.html

Never Cull Fish
“Culling” is staying within the catch limit for a species by releasing fish
from a stringer or other holding device when a larger fish is caught. Fish
that have been held on a stringer or in a tub usually die if released because
of stress and because of damage to their gills, fins and scales.