Salmo ciscaucasicus
| Salmo ciscaucasicus | ||||||||||||
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| Scientific name | ||||||||||||
| Salmo ciscaucasicus | ||||||||||||
| ( Dorofeyeva , 1967) |
Salmo Ciscaucasicus is a species from the family of Salmonidae (Salmonidae) of Azerbaijan along the north west coast of the Caspian Sea and to the Volga and the Ural occurs.
features
Salmo ciscaucasicus reaches a length of up to 1.3 meters. The height of the body is 15-20% of the standard length , the head height 59-65% of the head length. The upper jaw reaches the level of the rear end of the eye.
Way of life
There are anadromous migratory, lakes colonized and remaining life in small streams forms ( "sea trout", "lake trout" and "brown trout"). The anadromous migratory forms penetrate to a depth of about 50 meters in the Caspian Sea. Young animals and “brown trout” feed mainly on various invertebrates, large migrating animals feed mainly on fish and large crustaceans. Sexual maturity is reached at three to five years of age, one year later in the females than in the males. Originally the spawning migration took place in two trains. Some of the animals migrated in late summer with the peak of the migration in October and spawned in the same autumn and returned to the sea in December. Another part migrated from December to February and spawned in the coming winter after a 10 to 12 month stay in the river. The animals also eat during the migration. The spawning grounds are in high-lying streams. The young animals migrated into the sea after two to four years, where they stayed for up to four years. Sexually mature animals probably spawned only once in the Terek , but otherwise up to four times. Today, the spawning migration and the migration of young animals into the sea are largely prevented by dams, so that the preservation of the species depends on local populations.
threat
The species as a whole is not considered endangered, but the anadromous migratory form is probably extinct. Some authors see these as not conspecific with the local forms, so that Salmo ciscaucasicus would probably have become extinct and the remaining populations would have to be led under a different name.
swell
- Maurice Kottelat , Jörg Freyhof : Handbook of European Freshwater Fishes . Publications Kottelat, Cornol 2007, ISBN 978-2-8399-0298-4 , pp. 427-428 .
Web links
Salmo ciscaucasicus on Fishbase.org (English)