If you are looking for information about the maritime trades or businesses related to the sea. The Maritime Federation of the bay of Douarnenez is your best bet.
July 24 to 27th 2014 Douarnenez will host its bi-annual maritime festival Temps des Fête:
In 2012 they had a record 1200 boats participate in the festival with over 100,000 people attending more than 60 shows and programs throughought the three ports of Douarenenez & Treboul
I just came accross this wonderful historic recreation of the traditional collection of “goemon” which is a type of seeweed on the Brittany coast near Plouguerneau which is about an hour and twenty minutes away from Douarnenez to the north of the city of Brest.
Check out this beautiful facebook album on the historic process.
The demonstration farm in the Plomarc’h next to the town of Douarnenez was renovated in 2013 as reported in the Télégramme.
Here is a link to the municipality of Douarnenez’s website for the “ferme des Plomarc’h” programming.
The farm serves as a “gite rural” with a stable of heritage breed farm animals from Brittany. They allow free access to all the paddocks and the garden and during the year offer educational programming for adults and children.
A superb article in french on the history of the Plomar’h by Michel Mazeas. It is particularly detailed on the gallo roman period and sardine salting ponds that created garum.
Plomarc'h Bleunioù: the flower of the Plomarc'h 