The traditional method of production of mejillón in Galicia is the culture in tray. This system is the one of better yield of the known ones, and the 240,000 tons of mejillón commercialized annually in Galicia suppose more than half of the world-wide production by cultures of this molusco.

Although the culture of mejillón in trays is original of Japan was begun to use in Galicia in Ri'a de Arosa in 1946 and it went away modifying progressively until at the present time the grate, resemblance to the one of the fixed breeding grounds, is of eucalyptus beams and the floaters are great iron cans covered of poliester. This system of culture had a fast development that has taken to the present presence of 3,377 trays of mejillón in you laugh them Galician.

 The culture
The producer or cultivator of mejillón it is known mejillonero as and it tells him on a special boat to make some of the culture maneuvers like which it is seen in photography 360 (Boat of Anxo a good friend). In general the culture of mejillón can be differentiated these stages: 1 obtaining of seed, 2 positioning of the seed in cords, 3 unfolds or control of the number of unit and 4 gets fat and harvests. The culture begins with collects it of small mejillones (of between 0.250 mm and 2 cm.) to that "seed" is denominated to them, or of the rocky zones exposed to the ocean and near islands (70%) or of artificial collectors who are placed in the own rafts of culture (30%).
The seed, and at its moment, mejillón coming from unfolds is placed by hand with the special machinery throughout the nylon cords, surrounding itself with a fine network of cotton which holds mejillón until this one produces called filaments I encore with which it adheres strongly to the cord. This happens in just a short time and, by then, the cotton mesh already is had exhausted in the water (5 to 7 days). In each cord they are possible to be placed of 14 to 15 kilograms of seed and each 30-40 cm. is inserted plastic bars or wood of 20 or 30 cm. to avoid that the seed, when grows, is given off by its own weight. Finally the cords are hung of the framework of the raft by means of a thin cord but denominated "end".  Text