Prepare your fish by removing head, tail and all fins.
If skin is slimy, dampen a paper towel with vinegar and wipe down so fish is easier to handle.
Remove backbone in large fish (such as steelhead).
Cut fish into lengths according to jar height, being sure to leave 1-inch headspace at the top.
Add 1 teaspoon of salt to pint jar (only 1/2 tsp for half-pints).
Pack fish into jars.
Wipe jar's rim with vinegar.
Fasten canning lid and band into place.
Put jars in pressure canner and tighten lid.
Turn burner to high and wait until you see steam escaping from the vent.
Set timer and let steam escape from vent for 10 minutes.
Put weight on vent (or close if you have an old fashioned canner).
Bring pressure canner up to the proper PSI for your canner type and altitude.
When the proper PSI is reached, start your timer and monitor canner to be sure it stays in the proper PSI range.
After timer goes, turn off stove burner and let canner sit undisturbed until the dial returns to 0. Do not remove weight, open valve, or remove lid during this time.
When your dial reaches 0, you can remove the weight or open the vent.
Carefully remove the canner lid, being sure to lift the far side first to avoid getting a nasty steam burn.
Use a jar lifter to set hot jars on cooling rack.
Let jars of fish sit undisturbed for 8-12 hours.
Test jars for a seal, putting any that failed into the fridge to be used in a week's time.
Sealed jars of fish can go on a pantry shelf and are stable for 1 year.
Notes
Whether you have a dial gauge or weighted gauge canner, raw fish in pints or half pint jars must be processed for 1 hour and 40 minutes. Here are PSI adjustments for your canner type and altitude adapted from the National Center Home Food Preservation. Dial Gauge Canner0-2,000 ft=11 lb2001-4,000 ft=12 lb4001-6000 ft=13 lb6001-8000 ft=14 lbWeighted Gauge Canner0-1,000 ft=10 lbover 1,001=15 lb