The quantitative fatty acid signature analysis (QFASA) study alluded to earlier has 19 prey classes defined for 269 fish signatures.

The study doesn’t reveal if steelhead was one of the 269 fish signatures put into one of the prey classes. However, one would imagine that steelhead was one of the 269 and impacts on steelhead by harbor seals are probably already known.
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The world will not be destroyed by those that are evil, but by those who watch them without doing anything.- Albert Einstein

No you can’t have my rights---I’m still using them