I first thought the planet tipping its pole sunward, that is, "summer," would cause the oceans on the surface of to surge toward that same pole. "Winter," when the pole tips away, would cause the oceans to head toward the equator. It would be rather like high tide and low tide.
Modeling this in my mind a bit more, I realized that only the night side of the planet would have a surge in the summer toward the pole. The day side of the planet in Eclectia-summer would head away from the pole. When the pole shifts back 2 and a quarter days later, it's again the night side shifting toward the poles and the day side sifting toward the equator.
This, along with the planet's rotation and uneven heating, should set up some gigantic ocean currents that would tend to hug continental shelves, and would perhaps make separate circuits in the northern and southern hemispheres. If Eclectia rotates the same direction as planet Earth, I think there would be a tendency for currents to run clockwise in the northern hemisphere and counter-clockwise in the southern, just like on Earth.
But these currents would be probably be much larger and stronger than any oceanic current on Earth, due to the strong tipping motion of the Eclectia in a relatively short period. Also due to the strong tipping motion, even though the currents would in general rotate one direction, periodically they'd be strongly pulled back the other way. This would also produce tides of a sort. You would expect then a "low tide" when the ocean current reverses itself and a "high tide" when the ocean comes surging back to its natural direction.
It makes my head hurt to try to figure out exactly when high tides and low tides would come, but it should be in a regular pattern roughly following the fiveday. So the ocean would be at a regular level most of the time, but for a number of hours twice a fiveday (I don't know how many hours, but probably less than 12), it would surge low, and then immediately afterward it would surge high, followed by a slow ebbing down through normal all the way to low tide.
To make all of this more complex, an individual port city's relationship to the Eclectia "tide" would depend on the orientation of the harbor in relation to the prevailing local oceanic current. So if Adagio is in the northern hemisphere on the western shores of its continent and its port faces south, the nearby oceanic current going from north to south, the difference between high tide and low tide will not be nearly as great as if the port opened to the north. A north-facing port would get sucked dry in low tide and flooded over in the high tide under the circumstances I just described.
By the way, all this speculation is designed to add depth and dimension to the story world--not take away anyone's writing freedom or to confuse people or make life harder. Thanks for listening!
For what it's worth, I think I'll write a story that reveals Adagio is in the location I just made--on the west coast of a northern continent, but with it's harbor facing south...