Donax trunculus , commonly known as Tellina, is a small bivalve mollusk from the nearly triangular. The two clam shells are slightly different in size. Externally, the shells show a shiny appearance and are very visible signs of increased concentration that are intersected by thin radial lines more or less visible. The edible part inside is white with shades that can vary from brown to violet. It 's a very common species in our seas and live up to 18 meters deep but is more common in the first meters. Like all bivalves are filter-feeders, and feeds an everted the traps by sandy substrate, while the rest of the body remains sunken a few inches under the sand. Fishing for this clam is practiced with a tool called "rake", which can be towed by a boat or a person. To collect in some areas are also used the dredges. Being a filter-feeders is important to know the site of origin should be excluded from the market because the specimens living in polluted waters. Cockles must be sold live (the only index of freshness to this product) because once the clam is dead quickly to meet the normal processes decompositivi. At the time of the valves should be secure in the animal died because they will open and stay open. Sicily is famous the Tellina of Catania, where is widely marketed.
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