These fixed spatial measures (sanctuaries) are not an effective or necessary tool for many reasons. Notably our neighbours to the South have opted not to implement fixed spatial measures in favour of strengthening avoidance or exclusion zones around whales. I wonder why??
The issue from what I have researched isn't competition for prey, rather it is limiting physical and acoustic disturbances that interfere with prey acquisition. Canada could do far better in protection of SRKW if we implemented very stringent 400m avoidance/exclusion zones with serious efforts at education/awareness backed up by on-water enforcement that practices education as first response, and progression along a continuum of increasing penalties for those who ignore the rules.
Well documented that there's more than enough prey, the issue is all the vessels harassing them while feeding that interferes with prey acquisition.
Even if there was stronger evidence a fixed sanctuary approach was necessary - We also have ignored opportunities to put in place best practices that help mitigate the social and economic impacts of fixed spatial measures where we insist on implementing them...going hard on measures to close areas when whales are present, and non-existent when there is opportunity to implement measures to remove closures when whales are no longer in these areas. Hard to build broad based community support for spatial measures when there is no apparent effort to implement measures from an "administrative fairness" perspective by turning measures on when whales are present, and turning them off when they are no longer in the areas under special protection. Sad to see that for some areas closed the whales were only there for a few days all season - how is that helping the whales while mitigating social and economic impacts to nearby communities where these measures are imposed? That is the administrative fairness rub, and how it harms building community acceptance for fixed spatial measures more broadly.
Sadly we are missing good opportunities to shift the on-water boating culture from "see a whale and go get a closer look" to see a whale, and "immediately turn in the opposite direction to give them room to forage peacefully". Everyone could do a lot of good by practicing the latter.