Octopuses Deployed in Adriatic Sea to Combat Invasive Blue Crabs
In a bid to tackle the invasive Atlantic blue crab in the Adriatic Sea, Italy's Project Octo-Blu has released approximately 130,000 octopus paralarvae off the coasts of Cesenatico and Riccione. The initiative, led by the University of Bologna, aims to leverage the predatory habits of octopuses to control the crab population, which poses significant threats to both marine ecosystems and local fisheries.
The project, which began in 2024, also includes the installation of artificial dens to provide shelter for the octopuses. This effort is part of a broader strategy to use natural predators as biocontrol agents against invasive species.
Research conducted by the Institute of Agrifood Research and Technology in Spain has demonstrated the octopus's capacity to consume substantial amounts of blue crab biomass. Adult octopuses can consume up to 415 grams of soft tissue biomass per day, while subadult octopuses consume about 272 grams daily. These findings highlight the octopus's potential as an effective predator in controlling crab populations.
However, challenges remain. Octopuses tend to avoid sandy and warm lagoon habitats where blue crabs thrive, limiting their effectiveness in certain areas. Despite these limitations, their abundance in coastal habitats and broad diet make them a promising candidate for natural biocontrol.
Field observations have documented the first instances of wild octopuses preying on adult blue crabs along Spain's Mediterranean coast, suggesting that octopuses could play a significant role in managing crab populations in the wild.