i've made sushi with countless sockeye salmon.
fraser caught sockeye, especially chromers (with the occasional sealice) are perfectly fine. these wild fish are not year round residents, unlike the farmed salmon used in most sushi restaurants.
the secret is to inspect your fillets. look for smoothness and cleanliness of the flesh, consistent colouring and marbling of fat.
do not use fillets with evidence of brucing, welts, cancers, and of course parasites.
do not use salmon that have been sitting in a pool of water and have been baking in the sun.
before consuming any raw salmon, you must quick freeze it for a minimum of 48 hours. even better...vaccum seal it. thawout in the refridgerator and do not refreeze.
these instructions, were originally given to me by my neighbour, who happens to be a professional sushi chef, who trained for 5 years in japan....and yes he happens to be japanese.
just remember, proper food handling and prevention of cross contamination will minimize (though NOT eliminate) food poisoning.