Where the Peneios River concludes its long journey and its waters merge with the Aegean Sea, a unique inhabitant moves among the fishermen’s boats and nets.

With its distinctive blue color on its claws, powerful pincers, and aggressive behavior, the blue crab has been a familiar sight in the river delta for many years. To the locals, it’s “the Italian.” To fishermen, it’s an old acquaintance—but also a major nuisance.

From late spring and especially during the summer, the blue crab appears in large numbers at the mouth of the Pinios River. It gets tangled in nets, cuts through fishing gear with its powerful claws, and makes daily life difficult for the people who depend on the river and the sea for their livelihood.

This is the Atlantic blue crab, with the scientific name Callinectes sapidus. According to data from a research project by the Region of Central Greece on the marine ecosystem and invasive species, the blue crab is native to the western coast of the Atlantic Ocean, where it inhabits estuaries, lagoons, and other coastal ecosystems.

At the mouth of the Pinios River, the highest concentrations are observed mainly from early to mid-June, according to local records. Fishermen know from experience that in winter, blue crabs move to deeper waters, while in spring they return to the coast and river estuaries to reproduce. Catches of blue crabs increase during the summer months, when their presence in shallow waters becomes more pronounced.

Speaking to the Athens-Macedonian News Agency (ANA-MPA) about the long-standing presence of the blue crab in the Peneus River estuary is Nikos Dagas, who also shared the special name used by local fishermen both in the area and in the Thermaic Gulf. A name that has been passed down by word of mouth, reflecting how the fishing community welcomed an unfamiliar creature that appeared in their nets.

“We’ve been seeing the blue crab here for many years now, and especially in the summer, the mouth of the Pinios River is teeming with them. The locals here, just like those in the Thermaic Gulf, call it ‘the Italian.’ Behind this name lies an old story, according to which the species was introduced to Greece by the Italians during World War II. “It’s a story that has been passed down by word of mouth and has remained alive to this day, along with the image of the blue crab as a foreign ‘invader’ that settled in the region’s waters,” says Mr. Dagas.

Of course, this particular version is preserved as an oral tradition and has also been documented in European research materials. Scientists, however, believe that the blue crab most likely arrived in Europe via the water carried in ships’ ballast tanks.

“Over the years, its presence has become so widespread that it no longer comes as a surprise. Today it may be an invasive species, but it has become a familiar sight in the estuaries and part of daily life for the people who live and work along the Pinios River,” says Mr. Dagas.

George Georgakis, a local fisherman with many years of experience at the Peneios estuary, describes the fishermen’s relationship with the blue crab to the Athens-Macedonian News Agency (ANA-MPA). As he explains, he has known this species since he was a small child, as its presence in the area is nothing new.

“I’ve known about them since I was a small child. They’ve been in the area for many years, but they mainly appear in very large numbers during the summer,” he says.

For the people who cast their nets daily at the estuary, the presence of the blue crab is not particularly welcome. According to Mr. Georgakis, they are a “major nuisance” for fishermen, as the crabs get tangled in fishing gear and cause damage.

“They cut through the nets and cause a lot of problems. Their claws are as strong as pliers. As soon as they get caught in the net, they open and close them with force, grabbing whatever is in front of them and not letting go easily. You have to be very careful when untangling them, because they’re very aggressive and can even injure the fisherman,” explains Mr. Georgakis.

Giorgos Georgakis, however—like all the fishermen and local residents of the area—knows the other side of the blue crab, the one that’s revealed when it reaches the table. “Its meat is very tasty and has a distinctive flavor. Here, we serve it as an appetizer and place it in the center of the table, along with tsipouro and good company. It’s one of those appetizers that goes perfectly with summer and life by the sea,” he says.

Amateur fisherman Christos Liapis also shares his own experience with blue crabs with the Athens-Macedonian News Agency (ANA-MPA), describing a simple yet unique method of fishing from the shore.

“In the past, the blue crabs we caught were much larger than the ones we find today. I’ve even caught a crab that weighed as much as 500 grams. They have very powerful claws, and you have to be very careful when you approach them and try to pull them out, because once they grab something, they don’t let go easily. The great thing is that you don’t necessarily need a boat to fish for them. You can stand on the shore, use a piece of chicken as bait, and wait. As soon as a crab approaches and takes the bait, you gently lift it up and reel it in with the fishing rod. It takes patience and careful movements, but it’s a wonderful way to fish. “And once the process is over, it makes for an excellent appetizer, with very tasty meat, ideal for the dinner table and a glass of tsipouro,” says Mr. Liapis.

The spread of the blue crab, however, is linked to its ability to survive in different environmental conditions.

According to research conducted by the Region of Central Greece, Callinectes sapidus is a euryhaline and eurythermal species. This means it can withstand significant fluctuations in water salinity and temperature.

These characteristics help it establish itself in coastal areas where freshwater from rivers mixes with seawater. Such conditions also prevail in the Peneus Delta, creating an environment suitable for its presence and growth.

Every summer, however, the same scene returns to the mouth of the Pinios Delta. The boats head out onto the water, the nets are hauled in, and among the fish, the familiar blue claws emerge. The fishermen will carefully try to untangle them, grumble about the damage, and then, when the work is done, one of the crabs will end up in the middle of the table, next to the tsipouro. That’s pretty much how life goes at the mouth of the Pinios River, where even an “intruder” can, over time, become part of the stories and customs of the place.

Source: PROTO THEMA