Unless you watched it come out of the water took it immediately home and cooked it within minutes of still being alive you won't get really good halibut.
I thought I had had really good halibut until I had it that fresh and realized I'd bee wrong all my life. It is amazing how quickly halibut declines to a still good but significantly less good state.
The rate of decline varies quite a bit from species to species (red salmon holds much longer than pink or chum salmon, for example)
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