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Date Published: 26/01/2023
ARCHIVED - Millions of sea snails invade the Mar Menor
The mollusc has travelled to Murcia from the Red Sea and is a serious threat to native marine species

The bed of the Mar Menor is a flourishing habitat for countless animal species that usually live in harmony, adding to the diversity and beauty of this unique ecosystem. But it is also home to many non-native species, some unwittingly introduced by man and others which make their way to the Region through connecting waterways.
One such invasive creature is the cerithium scabridum conch, a small gastropod mollusc that has crossed two seas to reach the Mar Menor and has managed to adapt to the peculiar conditions of the lagoon. It is a prolific reproducer, and since it was first discovered in 2017 its population has gone from a small handful of individuals to numbering in the millions.

“The closed waters of the Mar Menor have high salinity and eutrophication, with very different characteristics than the open waters” of the Mediterranean or the Red Sea, “which confirms the high adaptability of this species,” Barcelona scientist Joaquín López Soriano explained.
The trouble with this mollusc is that it displaces other native snails as they compete for food and living space, a similar situation which arose due to the arrival of the blue crab in the Mar Menor and of radiata pinctada, another species of snail which is believed to have first entered the lagoon on the hull of a boat.

The shell of the cerithium scabridum is thin and ends in a point and has distinctive black spots, which easily differentiates it from its native cousins.
Scientists are closely monitoring the evolution of this invader to determine the impact it may have on other species of the Mar Menor.
Images: Canal Mar Menor
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