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Eel

The Japanese clam or Ruditapes philippinarum, is a marine bivalve mollusk, of the Verenidae family, highly appreciated in gastronomy, present on all coastlines of the world and which is the object of both extractive fishing and aquaculture farming.
Its shell is solid, ovoid, quadrangular, with an almost straight posterior margin, symmetrical valves, with serrated, concentric, and radial ribs that form a less dense reticulum than those observed in the carpet shell clam (Ruditapes decussatus).

The hinge of this mollusk has three cardinal teeth on each valve. Deep and rounded pallial sinus, without reaching the center of the valve, whose edge is smooth. The coloration of the shell is very variable, with a tendency to be dark, generally prevailing brown, decorated with various drawings, often large spots or concentric or irregular dark bands; whitish inside; It can reach 8 cm in length.
Its habitat is infralittoral, it lives buried in sand and mud, from the surf to a hundred meters deep, characterized by being a highly adaptable species due to its resistance to turbid waters, sudden changes in salinity and temperature, therefore which is a more resistant and prolific mollusk than the fine clam. Its presence is very common on beaches, river mouths, brackish lagoons and estuaries because it can live both on sandy and muddy bottoms, presenting great resistance to polluted waters; for these reasons, it is a species present on all coastlines of the world.

The Japanese clam can be found both along the Pacific, and seas of China andThe eel (Anguilla anguilla) is an eel-like fish of the Anguillidae family, which inhabits the estuaries of all the rivers that flow into the Atlantic, North Sea and Baltic; in the Iberian Peninsula it inhabits all the Atlantic estuaries and some Mediterranean hydrographic basins such as the Ebro.
The eel is characterized by developing its life cycle both in coastal waters and in the open sea, since its reproductive cycle occurs in the Atlantic Ocean at high depths.

It reaches 150 cm in length and 6 kg in weight, in an elongated and cylindrical body except for the tail, which is laterally compressed.
It does not have pelvic fins, the pectorals being developed, forming the dorsal, caudal and anal fins, a single fin that starts at the head, having small gill openings, located under the pectoral fin.
Its skin, covered with a mucosa, is made up of small and elongated scales, of variable color since the back can offer blackish, greenish or yellowish tones, while the ventral area is whitish or yellowish, acquiring silvery tones as it approaches the surface. maturity.
They have a prominent lower jaw compared to the upper one. Both jaws, as well as the vomer, are provided with fine teeth. Small round eyes that hypertrophy as they mature sexually.
Its diet is carnivorous and scavenger, since it feeds on fish, molluscs, crustaceans, annelids, waste and decomposing materials.
It is a catadromous animal, which leaves fresh or brackish water to spawn in the sea, a reproduction that it carries out in the central Atlantic at great depths, returning the juveniles innately to the estuaries and coastlines from where the parents left to spawn.
In Europe its cultivation is prohibited since, as the complete breeding cycle has not been able to be developed due to the impossibility of reproducing the physical conditions of the spawning habitat, aquaculture activity has been limited to its capture in rivers and estuaries at early ages, and its subsequent fattening in facilities, with a very high negative impact on the species, by preventing its reproduction.
Illegal fishing and the construction of large reservoirs that prevent them from completing their life cycle have been two factors that have contributed to the disappearance of this species in most of our rivers, which is why it is currently listed as "Endangered" being The capture of adults for human consumption is very limited, since it is restricted to quotas for professional fishermen and only from November to March, the fishing of juveniles or "angulones" being totally prohibited.
Its meat is very fine and tasty, which is why it is highly appreciated, admitting numerous ways of preparation: Fried, cooked, grilled, sautéed in a stew. It is a very popular fish in the Spanish Levante. Japan, as well as the western North Atlantic and Canadian coasts, as well as in the Mediterranean Sea, coasts of California and Mexico.
Their diet is based on phytoplankton, detritus, and decomposing organic matter in free water and in the benthos (soil and subsoil).
These nutrients are extracted by filtration, evacuating the water and waste through a siphon located at the back, in such a way that, like all molluscs, it is a biofiltering organism, contributing with its feeding behavior to the purification of water.
It is a species of great importance in aquaculture, China being the world's largest producer and in Europe, Italy is the most prominent, being cultivated in intertidal parks as it is developed in Galicia and in marshes transformed as estuaries or aquaculture parks in the southwestern zone. of the Iberian Peninsula.
Regarding its consumption, it is a highly valued mollusk, due to its tasty meat, highlighting its high level of protein, low level of fat and contribution of iron, iodine, selenium and vitamin A.