When I was a kid my dad made an excellent fish cleaning tray that lasted for years out of plywood. Varnished it up nice and then attached a manual brass bilge pump to the side - the intake hose dangled in the water and you had a great washdown system to rinse the fish off/out after cleaning. Economy model would substitute a small bucket for the hand pump.

Of course I'm lazier and have less time than my dad so I've got the coho cleaner which I've hung over the rail and mounted by drilling through the edge of the tray and through the rail and then using 3 stainless bolts/wingnuts for a sturdier mounting than the supplied ropes gives you. Then of course a high-pressure washdown hose takes care of those duties.

Bonk the fish, into the tray, cut the gills, gear back down while the fish bleeds, immediately clean the fish and bury in crushed ice. We spend a ton of money on catching the fish - why not get the best possible seafood home out of the deal.

My pre-divorce boat I had a custom tray welded up out of aluminum that was quite large (always the optamist) and I had a nylon filet table lid that hinged open or shut. Did all the bottomfish fileting right out on the water with the added advantage of closing the lid kept a reviving fish from flopping out of the tray. Actually lost a salmon that way once.

Fish on - here's to needing that tail notch in the end of the fish-cleaning tray!