What is the collective noun of trawlers?

There isn't a widely accepted collective noun specifically for trawlers. However, here are some options depending on the context:

General:

* Fleet - This is a common collective noun for a group of ships, including trawlers.

* Group - A simple and neutral option.

* Convoy - Implies a group of ships traveling together.

More specific:

* Swarm - Can be used if the trawlers are fishing close together.

* Shoal - Similar to "swarm" but implies a larger group.

Ultimately, the best choice depends on the specific situation and the desired effect.