Just effectively blockade- 3300 kilometers- it is not that simple. All vessels would have to be checked in and out to see if they were legitimate fishers-etc., some 'mother' ships seem to be provisioning at ports outside Somalia (Kenya, e. g.).
Port facilities are not needed, since larger vessels can be provisioned by small runabouts.
Smuggling of migrants and slaves (forced workers) also is rampant along much of the coast.

Some reports of the blockade being discussed, but no one in the military units has said it could be practical.

Actually my answer is 'I dunno'. I can't find much information on the coast, the thinking of parties involved, etc.