بررسي رژيم غذايي اردك ماهي )ESOX LUCIUS( تالاب امير كلايه لاهيجان

Diet study of pike (Esox fucius) in Lahijan Amirkelayeh Lagoon

Amirkelayeh wetland is important and international lagoon of Iran , that is setteled in Gilan province and north of Lahijan . This lagoon is live 15 species , that pike ( Esox lucius ) is the most abundant among of Lagoon fishes . In 2001, in order to determining of diet of Esox Lucius of Lahijan Amirkelayeh lagoon , 156 Picke were catch by Gillnet ,Common haul science , Costnet, Dipnet and Electroshoker and studied after biometery , age determination and necropsy. Obtained results say that Amirkelayeh Pirke eat a wide range of foods (9 foods). The highest frequency percentage was related to Tench (Tinca tinca) (%24) and Proterorhinus marmoratus (%l6) and lowest frequency percentage was related to Svngnathus abaster, Carassius auratus gihelio and Gammarus (each with %4) and Esox lucius , pleochoptera, frog and water beetle each with %8 frequency percentage were in the middle places .This fishes in age groups of 1" - 6ʹ had avarage total length of 44.8 cm (15.6 - 63 cm) , average weight of 717.9 gr ( 24 - 1700 gr), average relative length gut of 0.69 ( 0.19 - 0.97 ) , average of Index fullness of 9118 (0.7 - 422) and average fullton,s condition factor of 723/5 (388/8- 1097/3) . According to obtained reasults , we can say that Esox lucius of this lagoon is carnivores , piscivores and cannibalism . Mean while , all of the foods were recognized in the stomach that express the palatability of these foods , and had external selection according to prey size and use of vision and olfactory . Also, diet of Esox lucius was changed in order to season , age and sex .