That 42 pound fish was caught in Alaska by a kid salmon fishing. It was 6 or 7 years old and lacked sex organs so it couldn't spawn. Just swam around and got fat. I've fished up north for the past 3 years and know of a few big fish caught by the commercial boats. One of the owners of a tender (off load) boat said he had a 50 lb steelhead pass through a few years back. I couldn't verify this or anything but it sounds perfectly possible.