Shell characteristics and consequent marketability of the oyster Crassostrea gigas are influenced by several factors, and most important of which are the rearing methods and gears. In this study, we investigated the effects of two different gears on the quality aspect (shell shape, weight meat percentage, backward shell shape, epibionts and blisters) and growth rate (weight and length) of C. gigas by adopting the innovative Ortac Oyster Farming System, during the field grow‐out phase of production. Aspect and growth of oysters farmed in Ortac and floating bags were compared. After 14 weeks, the aspect of the animals was influenced by the gear, resulting in a lower quality in the Ortac (i.e. worse shell shape, lower weight meat percentage, higher percentage of backwards and blisters) than in the floating bag, while the incidence of epibionts was less in the Ortac. Regarding the growth performance, total wet weight gained in the Ortac was lower (~28.3 g) than in the floating bag (~32.4 g; p < .05). These results highlight the efficiency of the floating bag as oyster rearing system in the Mediterranean basin and suggest the need to alter the Ortac gear to these environmental conditions.

中文翻译：

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养殖设备关于长牡蛎的质量和生长性能（Thunberg，1793）：对适销性的影响

牡蛎Crassostrea gigas 的壳特征和随之而来的适销性受到多种因素的影响，其中最重要的是饲养方法和齿轮。在这项研究中，我们通过采用创新的 Ortac Oyster 研究了两种不同的齿轮对 C. gigas 的质量方面（壳形状、重量肉百分比、后壳形状、外生和水泡）和生长速度（重量和长度）的影响农业系统，在生产的田间养成阶段。比较了在 Ortac 和浮袋中养殖的牡蛎的外观和生长情况。14 周后，动物的方面受到齿轮的影响，导致 Ortac 的质量低于漂浮袋（即更差的外壳形状、更低的肉重量百分比、更高的倒退和水泡百分比），而表皮生物的发生率在 Ortac 中较低。关于生长性能，Ortac 中获得的总湿重 (~28.3 g) 低于浮袋 (~32.4 g; p < .05)。这些结果突出了漂浮袋作为地中海盆地牡蛎养殖系统的效率，并表明需要根据这些环境条件改变 Ortac 渔具。