Faculty of Engineering, Kyushu University, Fukuoka 819-0395, Japan.
Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, Miyagi 980-8579, Japan.
Mar Drugs. 2021 Jun 25;19(7):369. doi: 10.3390/md19070369.
Bivalves serve as an important aquaculture product, as they are the source of essential fatty acids, such as eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), in our diet. However, their cultivation in the wild can be affected by fouling organisms that, in turn, affect their EPA and DHA content. The effects of fouling organisms on the EPA and DHA contents of cultivated bivalves have not been well documented. We examined the effects of fouling organisms on the EPA and DHA contents and condition index of cultured oysters, , in an aquaculture system. We sampled two-year-old oysters from five sites in Shizugawa Bay, Japan, in August 2014. Most of the fouling organisms were sponges, macroalgae, and . A significant negative relationship existed between the DHA content in and the presence of sponges and macroalgae. A lower EPA content corresponded to a higher fouling mass and a lower condition index. This can be explained by dietary competition between and for diatoms, which were the main producer of EPA in our study sites. Our findings indicate that fouling organisms likely reduce the EPA and DHA content in cultivated oysters. Therefore, our results suggest that the current efforts to remove fouling organisms from oyster clusters is an effective strategy to enhance the content of EPA and DHA in oysters.
双壳贝类是一种重要的水产养殖产品，因为它们是我们饮食中必需脂肪酸（如二十碳五烯酸（EPA）和二十二碳六烯酸（DHA））的来源。然而，它们在野外的养殖可能会受到附着生物的影响，而这些附着生物反过来又会影响它们的 EPA 和 DHA 含量。附着生物对养殖贝类 EPA 和 DHA 含量的影响尚未得到很好的记录。我们研究了附着生物对水产养殖系统中养殖牡蛎、、EPA 和 DHA 含量和条件指数的影响。我们于 2014 年 8 月从日本静冈湾的五个地点采集了两岁的牡蛎。大多数附着生物是海绵、大型藻类和。在和中，DHA 含量与海绵和大型藻类的存在呈显著负相关。较低的 EPA 含量对应于较高的附着生物量和较低的条件指数。这可以用和之间对硅藻的摄食竞争来解释，硅藻是我们研究地点 EPA 的主要生产者。我们的研究结果表明，附着生物可能会降低养殖牡蛎中的 EPA 和 DHA 含量。因此，我们的研究结果表明，从牡蛎群中去除附着生物的当前努力是提高牡蛎中 EPA 和 DHA 含量的有效策略。
