In my so-far-unnamed multiracial fantasy conworld, I have just said (in a different thread), that, when ocean-going ships “become a thing”, the best sailors will be the Mer-Centaurs; but every ship will want a Human navigator and an Elven carpenter and a Dwarven engineer.
I think more could be said.
I’ll bet they’d also want their top two officers to be a Human and a Mer-Centaur. Either a Human captain with a MerCentaur 2nd-in-command, or a MerCentaur captain with a Human second.
If the ship is wind-powered, there’ll probably be some duties requiring a sailor to climb a mast. If a mast is very tall and/or the ship has many masts, these duties would best be assigned to Elves. So a “clipper”, for example, would want several Elvish sailors. OTOH they’d also want enough MerCentaur sailors to handle any duties involving going into the water, such as rescuing Elves who fell overboard without learning to swim first. Or, actually, most duties that didn’t involve leaving the deck or climbing the rigging.
If the ship is steam-powered, they might want the “black gang” to consist mostly of Dwarves.