Age Structure and Growth Rate of Perch (Perca fluviatils) in Lahijan Amirkelayeh Wetland

Subject Areas : Journal of Animal Biology

محمد  وفاجوی دیانتی ¹ (دانشگاه آزاد اسلامی، واحد لاهیجان، دانشکده منابع طبیعی، گروه شیلات، لاهیجان، ایران)
حسین  خارا ² (دانشگاه آزاد اسلامی، واحد لاهیجان، دانشکده منابع طبیعی، گروه شیلات، لاهیجان، ایران)
علی  بانی ³ (دانشگاه گیلان، دانشکده منابع طبیعی، گروه شیلات، صومعه سرا، ایران)
رضوان اله  کاظمی ⁴ (انستیتو بین المللی ماهیان خاویاری دکتر دادمان، رشت، ایران)
مریم  صائمی ⁵ (دانشگاه آزاد اسلامی، واحد لاهیجان، دانشکده منابع طبیعی، گروه شیلات، لاهیجان، ایران)

Received: 2014-06-21 Accepted : 2017-05-21 Published : 2013-07-23

Keywords: Perca fluviatilis, Growth pattern, South basin of the Caspian Sea, age determination,

Abstract :

In this research, age structure and growth pattern of Perch (Perca fluviatils Linnaeus, 1758) from the Lahijan Amirkelayeh Wetland was studied on a monthly basis in a year. In total, 265 specimens were caught and the weight and length were measured and the age was determined by opercula and scaleand#39;s reading. The age data showed that the fish were between 2 + to 6 +. Male, female fish classified respectively in 12 and 13 length frequencies groups. The average instantaneous growth rate of perch showed that the age groups 2 + to 3 + with 0.461 grew faster than other groups and slowest growth belonged to age groups of 5 + to 6 + with 0.231. Condition factor of specimens showed that the highest one with 2.49 (r 2= 0.938) belong to female and the lowest one with 1.06 (r2= 0.944) belong to male fish. Pauliand#39;s applied growth pattern showed almost an isometric growth for total, male, and female fish and tendency to positive allometric growth. Total sex ratio (178 male to 78 female) showed a significant difference.