From the transcript

But like we learned at Ballard Locks, these removal efforts only have short-term effects. New sea lions will return. And so you're going to go in for the long term for this if you want to keep doing this. It may be more effective to remove some of those hydrodynamic bottlenecks that cause salmon to queue up at high predation sites or develop barriers that separate pinnipeds from salmon or provide sound deterrents. But ultimately, looking at this as an ecosystem scientist, I'm concerned that because habitat remains limited and ocean conditions are not favorable, It's unlikely that widespread removal of seals and sea lions will have little measurable effect on overall salmon stocks.

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