Tonnara

Almadraba in Spanish (Portuguese: Almadrava) is a word of Al-Andalus Arabic origin المضربة almaḍraba : 'a place to strike' < Arabic root ضرب 'to strike, hit'. It is an elaborate and age-old Phoenician technique for trapping and catching Atlantic bluefin tuna that was learned and taken to areas such as Iberia during Iberia's Islamic period.

The technique is to trap and catch the tuna when they are crossing between the Atlantic ocean to the Mediterranean during February to July, on their way to spawn and until recently, on its return journey, (“al revés”) when they come back into the Atlantic Ocean, they also Bycatch: bullet tuna (Auxis rochei), little tunny (Euthynnus alletteratus), Atlantic bonito (Sarda sarda), bigeye tuna (Thunnus obesus) and swordfish (Xiphias gladius).

It is a traditional form of tuna fishing or netting fence to catch tuna that is carried out in Italy, Morocco, Portugal (Mainly in the Algarve) and Spain (Mainly Andalusia, Murcia and Valencia).

A similar technique exists in Sicily known as mattanza (a borrowing from the Spanish word matanza, meaning slaughter), introduced either by the Spanish or by the Moors during Sicily's own Islamic period.

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Wikipedia