http://www.pac.dfo-mpo.gc.ca/recfish/KeyPoints/packaging_e.htmPackaging Your Salmon When packaging your catch, if a maximum size limit applies, the head and tail must remain attached until you prepare and consume your catch, arrive at your ordinary residence, or deliver your catch to a registered processing facility.
The head of your salmon can be removed only if the length with the head off is equal to or greater than the minimum legal size of that species for the waters in which it was caught. Leave the tail attached so the species can be determined. For example, if a chinook salmon is caught where the minimum size limit is 62 cm and it is filleted and packaged for transport, one of the fillets must have the tail attached and be at least 62 cm long. If necessary the fillet can be cut into two pieces; the tail must remain attached to one of the pieces. The fillets should be placed side by side in one bag making it obvious that they represent one fish, and the bag must be labeled with:
a. the salmon species - e.g., "one chinook"
b. the number of fillets - "two fillets"
c. the number of pieces - "four pieces"
d. the angler’s name and fishing licence number.
The above is an excerpt from the DFO link referenced above.
I think this is a very important piece of information that most fishers are not aware of. By filleting your catch at your fishing location, as described above, you can leave these very important nutrients in the river and not add rotten fish to land fills. It is also a lot more convenient to harvest the desired portions and to carry out only the fillets and the tail.
Please do not leave any fish guts or fish parts on shore. It attracts scavengers, like bears, and it stinks up the shore. Throw all fish parts as far into the river as you can so the recycling of the nutrients starts immediately.
Be careful, though, with these regulations. Be sure you read and understand them before you fillet any fish streamside.