As I first posted here and as a courtesy to other forum members who one day may search for this information too, here is the gist of the advice that I received from Gui at the other forum:
There are only 2 fish farms along the portuguese coast. Both are situated at 12 and 25 miles East of Faro, almost at the Spanish border and are between 3 and 7 miles off the coast.
You can sail safely between the 7 and 25 mile line from the coast, anywhere.
Between Porto and Lisbon, be careful with the Berlengas islands, as they are true death traps, other than that, its a nice safe sail.
As a rule every day between 5pm and 7 pm, North winds blow up to 35 knots. (This is good for me because I will be heading south in a catamaran!)
Valiente, I have read that the Atlantic coasts of Portugal and Spain are heavily fished, so I am preparing for a sharp lookout on night watch. I think I will follow Guis advice and head out to around 25 miles offshore.
After my passage I'll post an update, but it might not be till the end of the summer
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Manny
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). Our delivery began in La Rochelle France and once we'd sailed up the Bay of Biscay we were ready for a rest so we called in at La Coruna, Spain. From there we had light winds to round Cape Finister and head south. We actually caught northerly breezes as we headed south, so I tacked out to sea. One long tack to about 35 miles off the coast and then another tack back to Caicais, Portugal our next stop. This allowed us to avoid the Berlengas Islands and to sail. 
