CABUNASTASIU
The lagoon area is richer in food than the sea, and for this reason, this environment is a strong call for fishes which habitually move in search of food and for juveniles which spend part of their live. Thanks to the knowledge of the habit of fish migration, from the sea to the lagoon and vice versa, fishermen have develop appropriate fishing techniques. Currently they use several tools such as the lavorieri, consisting of a double barrier V-shaped, and the fishing pots, made with one of the extremities closed and the other, funnel-shaped, opened to allow the entry of the fish but to prevents too its exit.
The freshwater of lakes and rivers houses many varieties of fish. The native freshwater species are seven, and until the beginning of the twentieth century were the only ones: Sea Lamprey, Big-scale Sand Smelt, Eel, Freshwater blenny, Three-Spined Stickleback, Trout, Twait shad. Subsequently several species were introduced including Common Carp, Tench, Black bullhead, largemouth bass. Fish have different shape and characteristics, because evolved in different habitats and feeding. From species to species are mutated the shape, mouth, teeth, so did the general characteristics over the eyes, brain and other internal organs: Dorsal Fin, Swim bladder, Gills, ventral fins, spine and caudal fin.
Many birds nest next to lakes and rivers such as the common blackbird, mallards, sultana bird and kingfisher. The common blackbird is long up to 25 cm, usually completely black or dark brown, with the beak and the eye area yellow-orange. Mallards, considered the ancestor of most domestic ducks, live on the water and goes on land only to nest and rest. The purple swamphen or sultana bird, is a large bird with usually dark blue or purple plumage. Another bird is the kingfisher, a bird of small size, long between 17 and 25 cm, with a characteristic color: the back is light blue with green or blue iridescent on the head, wings and tail, while the chest and belly are brown-orange or rust.
Among the amphibians present in these wet environments, the green toad and the Sardinian tree frog, are inserted by the Berne Convention as a protected species. The Sardinian tree frog, the smallest of the tree frogs, reaches the maximum 5 cm and is a beautiful bright green; the green toad has a squat body and warty skin, smaller than the common toad reaches about 10 cm. The Sardinian tree frog lays a thousand of eggs while the green toad up to 15.000. Both feed on insects.
In this lagoon even the reptile species have a high conservation value: five of them are part of Community interest, the others are protected species, such as the European pond turtle and the green whip snake.
OTHER ZONES
