Make one wooden floor with Four Window frame walls and ramp trap. Than lure it inside by leting it atack you when Come close. Destroy the ramp to not get wandering dilo inside. Than use your Ichthyornis to get some golden fish and bring that to feeding Window or you Can get fish by your self using spear. Wish luck
Tame to this kill fish and drag there body to it and once tamed if you feed them more dead fish corpses it will build up and lay a golden egg which is used as a buff to certain dinos or oil or a player buff
Use a horse to lasso it, then you can move it around to new fish spawns when the area gets cleared. The horse can also step on the duck to pin it down, or simply use the lasso to keep it close while tribemates gather fish.