Conflicts on vessels and ashore primarily starts with distrust. The second cause is a blame culture - typical question being "who did it or who is responsible" rather than "what went wrong". Remove these two causes (or who causes them) and things would be much better.

To handle crew conflicts onboard, establish open communication and actively listen to all parties involved to create an environment of trust. Identify the root causes of disputes—often stress, cultural differences, or misunderstandings—and address them with empathy and fairness. Implement a clear, transparent conflict resolution policy, and, if needed, involve a neutral mediator to ensure impartiality. Foster respect and cultural sensitivity through regular discussions, and encourage stress management activities, like exercise or team-building, to reduce tension. Recognizing crew efforts and celebrating achievements also boosts morale, reinforcing a harmonious, productive atmosphere on the vessel.

The right to complain is the only thing that can't be taken away from a sailor. Give your crew an ear, even if there is not a ready solution. Sometimes you can't fix it, but, "Go back below and sort this out amongst yourselves," and, "Going to sea is hard," are both acceptable answers. On one hand, those don't solve everything. On the other, enabling a sailor to fix it themselves can work better than you expect. And on the gripping hand, there are some issues a Captain doesn't need to be involved in.