I’m not much into fishing. A fishing judge should be able to eyeball the size of a fish and know about how much the fish should weigh. Fish do not take steroids and work out. When size vs. weight is way out of proportion, investigation should begin. These guys should have been caught a long time ago.
GMO Rainbow trout Frankenfish...
This is likely what caught the guys. There are long standing charts that equate length and girth of fish to weight. Since the fish were dead at weigh in, the judges were able to dissect the fish to suggest/conclude fraud.