Hope he made lotsa baby browns in his career!
Did you do any post-mortem on him or save him for the biologists?
Up in Maine the biologist's do "fin clipping" on fish they release in certain waters.... usually the vent fins and adipose. This way they can mark fish for the year they were released. First the adipose, next the left vent, then the right vent, then both vents then back to the adipose. It makes age determination & growth rates easier to determine.
For years many of us kept written records of "clips" and lengths and the data collected let us know how fast these fish grew. It also helped to determine how old hey got and the relative percentage of fish caught by year class to some extent. Useful data