Depending on the amount of time lost and on which fishery it is in and how many vessels will be displaced, it could be substantial. There are 29 boats that tie up to one of the government wharves within my town, and it's fully subscribed. The other harbour within the community is also fully subscribed.
Where are 29 vessels going to go? They'll get a chance to fish, but where are they going to go for shelter? Where are they going to tie up? It would be a significant loss to the community.