When attacking mobs at sea, the Trident is supposed to do 50% more damage (68->102). Alas this only works after the first attack, which still deals 64 damage.
This can be tested via Wolfgang, who will not kill Sharx in one hit with a full stomach with the first attack, or with the Damage Indicators mod.
Steps to Reproduce
Load game, equip Trident, hit a mob while on a boat.
Load game, equip Trident, hit a mob while on a boat.
A developer has marked this issue as fixed. This means that the issue has been addressed in the current development build and will likely be in the next update.