The goshawk originates from southern Canada and the northern United States and was introduced to Europe in the late 19th century.
Portugal: The gourd was first introduced in Portugal in 1898, in the Lagoa das Sete Cidades, S. Miguel, in the Azores.
On the mainland, however, only on 16 February 1952, through a small number of fingerlings (150), from a French fish farm, the Fishery of Clouzioux. The Achigã had an excellent adaptation and spread rapidly across all river basins, particularly south of the Tagus River, and is now considered one of the predators that has contributed most to a clear decrease of other small species, namely in the reservoirs.
Brazil: introduced in Brazil in the 1930s and inhabits several dams in Rio Grande do Sul, Santa Catarina, Paraná and São Paulo.
It has a haughty and elongated body, a large head with a large mouth and numerous and tiny teeth, justifiably aggressive, has a dark green or olive colored back and head, with golden flanks, white belly, the lateral line has a row of Brown or black spots, well visible in adults and the operculum has two dark bars and a black spot. It has a dorsal fin divided into two parts, the first having spiny rays, still having a prominent and prominent lower jaw in the mouth than the upper one.
It is characterized as a fish of temperate or little cold waters, inhabiting in places with aquatic vegetation in the lagoons and lagoons, appearing also in some middle and inferior parts of the rivers, and usually lives solitary or in small groups.It is a kind of surface not normally exceeding 7 meters deep and supports brackish water well.
It can measure up to 80 cms. And have a maximum weight of about 10 kilograms, these being the smallest measures in European specimens.
The adult Achigan is a very voracious predator, feeding preferentially of other fish and crustaceans and also of aquatic insects.
The younger ones have their food based on insects, crustaceans and molluscs while the fry feeds on plankton.
During the breeding season, from April to June, the male has a territorial behavior, protecting the nest until the new ones are 3 to 4 weeks old. After this period, it remains in very few shoals for another 2 or 3 months.
The spawning occurs when the water temperature reaches 16 to 18ºC, each female deposits between 4,000 and 10,000 eggs in places of low current and low depth, in nests made by males on layers of rocks, gravel, sand or between aquatic roots. The eggs adhering to the substrate of the nest, which is well guarded and where it seeks to constantly stir for better oxygenation of the eggs.After the posture, the companion is expelled from the nest, even being hunted, and the male can still attract another female.
Achigã Fishing Techniques
Minimum capture size: 20 cm.
Fishing period: 16 May to 14 March ( Exceptions to the PT fishing calendar )
Locations in Portugal-Barragem de Aguieira, Alvito, Arade, Bravura, Cabril, Caia, Caniçada, Capinha, Carrapatelo, Castelo de Bode, Coruche, Crestuma Lever, Ermal, Fagilde, Fonte Serne, Funcho, Idanha-a-Mato, Mato, Odivelas, Alentejo, Póvoa and Meada, Rôxo, Santa Clara, Torrão, Toulica, Vale Covao, Vale da Gata, Vale Of Carrapatoso, Valley of the Gaio, Sale Old one, River Arade, Caia, Degebe, Douro, Guadiana, Leça, Lis, Minho, Sado, Sever, Sorrel, Tâmega, Tejo, Vouga, Xarrama and Zêzere. Also in the Azores and Ria de Aveiro.
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