Investigation of the possible effect of Pike (Esox lucius) on the invasive fishes of the Persian Gulf Martyrs Lake, Tehran (original) (raw)

Lake of the Persian Gulf Martyrs has been constructed in the northwest of Tehran in 22 urban areas, which in addition to creating a recreational-tourism environment, has caused an increasing economic value to the adjacent lands. The declining water quality of the lake and the increasing abundance of rough and invader fishes such as Prussian carp (Carassius gibelio) and Sharpbelly (Hemiculter leucisculus) are a threat for ecosystem of the lake. In order to control these fishes, pike (Esox Lucius) as a predator was released in the lake. After introduction of pike was studied its diet and growth, and the changes of invasive fish population in 2018-2019. Lincoln–Petersen method showed that the population of Prussian carp was decreased from 20,000 to 8,300 individuals in lake. CPUE showed that population of Sharpbelly has been reduced from 712,000 to about 3,000 individuals in the lake. Using Jolly-Seber method, population of Sharpbelly from the lake shore did not change much during the ...