Mytilus galloprovincialis is one of recent bivalve species produced in Portugal offshore. The growth, condition index, and the fatty acid composition of the mussel produced at 2 and 13 m depth was compared in longline on the south coast of Portugal. For each depth, a monitoring of several water quality parameters such as temperature, turbidity, nutrients, and chlorophyll-a was carried out. There were no significant differences between mussel growths at different depths. On the first sampling, shell length mean was 24 mm, reaching 50 mm 9 months after. High dispersion of mussel length was observed due to slow growers. The condition index shows a typical seasonal variation, with high values in autumn and late spring and minimum values in January. Analysis of fatty acids did not reveal differences at both depths and DHA levels (8.71 mg/g) were generally higher than EPA (5.90 mg/g). The water quality revealed few differences in the environmental conditions in the water column, which may explain the similarities between the quality of mussels produced at different depths. Based on these data, the mussel offshore production in that area can be done at this range of profundities 2 and 13 m, without affecting growth and fatty acid composition.

鸡没食子菌是最近在葡萄牙近海生产的双壳类之一。在葡萄牙南海岸的延绳钓中比较了在2和13 m深度生产的贻贝的生长，状况指数和脂肪酸组成。对于每个深度，都对几个水质参数（例如温度，浊度，养分和叶绿素-a）进行了监控。不同深度的贻贝生长之间没有显着差异。第一次采样时，壳长平均为24毫米，9个月后达到50毫米。由于生长缓慢，观察到贻贝长度的高度分散。条件指数显示典型的季节变化，秋季和春季晚些时候有较高的值，1月则有最小值。脂肪酸分析未显示深度和深度之间的差异，DHA水平（8.71 mg / g）通常高于EPA（5。90 mg / g）。水质显示出水柱中环境条件的差异很小，这可以解释不同深度生产的贻贝质量之间的相似性。根据这些数据，该区域的贻贝近海生产可以在深度2和13 m的范围内进行，而不会影响其生长和脂肪酸组成。