Carp fact Sheet : http://aep.alberta.ca/fish-wildlife/invasive-species/aquatic-invasive-species/documents/AIS-Quickfacts-PrussianCarp-May2015.pdf

Some interesting facts around fishing in Alberta relative to other provinces for some perspective on why fish capture limits are so low.

Ontario has 250,000 fish-bearing
lakes, with 585,000 licensed anglers, 
or 2.3 anglers per lake. 

Saskatchewan has 94,000 fish-bearing lakes, 
with about 184,000 licensed anglers, 
or 1.9 anglers per lake.

Alberta has only 800 lakes with fish, 
but 250,000 licenced anglers, or 
312 anglers per lake.