It seemed the Mar Menor already had enough problems to deal with, but now science has revealed a rather stark reality that directly affects its fauna. A recent study led by the Spanish Institute of Oceanography (IEO-CSIC) has focused on the blue crab , a species that has expanded rapidly in the area, and the results leave no doubt about the health of this ecosystem.
It turns out that not a single specimen analyzed in the research escaped contamination, giving us a very clear indication of the extent of plastic pollution . This research, published in the specialized journal Regional Studies in Marine Science, confirms that this waste has become an integral part of the crustaceans' bodies, affecting the entire population studied.
Impact on muscle tissue and human consumption
The most troubling aspect of this issue is that researchers have found these particles not only in the digestive system, as might be expected, but also in the animal's muscle tissue . This is no small matter, since that is precisely the part intended for human consumption. The presence of fibers and plastic fragments in crab meat calls into question the commercial quality of the product and opens a necessary debate about the potential risks to people from ingesting these contaminants.
This suggests that microplastics are not merely passing through the crab's body, but rather becoming lodged in the parts that ultimately reach our plates. Scientists warn that this situation could become a direct route of exposure for consumers, necessitating a close examination of fishing practices in these waters, which are heavily impacted by human activity.
The role of the gastric mill in the degradation of plastics
The study highlights a biological curiosity that, in this context, works against us: the crab's gastric mill . This internal structure, naturally designed to grind food and facilitate digestion, is breaking down the larger plastic fragments the animal ingests. In processing them, it generates even smaller microplastics , which makes it easier for these particles to migrate from the digestive system to other tissues in the body.
This internal fragmentation process greatly complicates matters, as it transforms visible waste into microscopic particles that are much more difficult to track and remove. Experts at the IEO point out that this ability to break down synthetic materials is one of the factors that explains why the blue crab exhibits such a high accumulation of pollutants compared to other, less active feeding species.
A key bioindicator for the Mediterranean
LucÃa Viñas, a researcher at the Vigo Oceanographic Center and head of the study, pointed out that this species is ideal for monitoring the environmental health of our coasts. As an omnivorous animal that lives closely linked to sediments, where most marine debris accumulates, the blue crab acts as a perfect indicator of human impact on the ecosystem . Its wide distribution along the entire Mediterranean coast greatly facilitates monitoring efforts.
The total presence of synthetic debris in these crustaceans underscores the urgent need for stronger measures to protect the biodiversity of the Murcia lagoon. Establishing a continuous monitoring system focused on this species will allow scientists to better understand how plastics move through the food chain and will help in designing more effective plans to mitigate the long-term impact of waste on fisheries resources.
