While fishing vessels including suicide boats can attack anything on the seas, but given the electronic surveillance systems of the CBG, it will be real difficult that a swarm of such fishing boats are not detected.
In war, any unidentified boat, that is not declared as known friendly shipping, will be targeted.
One must not forget the the US Navy and Marines have a highly sophisticated NCW grid.
Network-centric warfare (NCW) is a key element of defense transformation. Key programs for implementing NCW in the Navy include the Cooperative Engagement Capability (CEC), the Joint Fires Network (JFN), the IT-21 program, and ForceNet.
The Joint Fires Network, earlier called the Naval Fires Network (NFN), links naval forces operating in an area into a single real-time targeting network for coordinating gunfire and missiles to attack surface and land targets, particularly time-critical targets.
Therefore, off the cuff opinions are real dangerous for gauging criticality of issues.