It's hard to know where to start with the Nigerian boat fight. There is the ongoing tension between Nigeria and its neighbors over the contested territory of the Bakassi Peninsula. There is the history of violence between the various ethnic groups in the region. There is the struggle for control of the lucrative oil resources in the region. And there is the presence of militant groups like Boko Haram who are seeking to take advantage of the chaos.
In short, there are a lot of factors at play in the Nigerian boat fight. And it's impossible to say definitively what is driving the violence.