Pink halibut

From a thread in the Mildly Interesting subreddit:

Fishery scientist here, it probably ate a bunch of cured eggs (fish roe), which is used as sport salmon bait in AK. The pink dye used in the roe can come through the skin. I've seen this happen to others salmon, but never a halibut...

Halibut often feed near river deltas during the salmon run. Cured roe is mostly used in rivers to catch King salmon, not far from the ocean. I imagine it could have simply drifted downstream, where the halibut picked it up. If you've ever been to the Kenai River during sport King season, it's not hard to imagine this happening with the hundreds of pounds of cured bait used every day.