A Study Diversity of Morphological Characters of Brown Trout (Salmo trutta fario) in Tajan River and Babolrud River in Mazandaran Province

Subject Areas : New Technologies in Aquaculture Development

S. Vatandost ¹ (Ph.D.Student, Science & Research Branch, Islamic Azad University(IAU))
Gh.H. Vosoghi ² (Prof. Dep. of Marine Biology, Science & Research Branch, Islamic Azad University(IAU))
Sh.A. Nezami ³ (Research Assistant Prof. of Iranian Fisheries Researches Institute)
A. Abdoli ⁴ (Assistant. Prof. of Research Institute of Environmental Sciences, Shahid Beheshti University, Tehran)
A. Matin far ⁵ (Research Assistant Prof. of Iranian Fisheries Researches Institute)

Received: 2019-11-07 Accepted : 2019-11-07 Published : 2008-08-22

Keywords: Babolrud River, Tajan River, Brown Trout (Salmo trutta fario), Morphometric, Meristic characters,

Abstract :

The study was conducted to determine suitable characters for separating brown trout (Salmo trutta fario) populations from Tajan River and Babolrud River in autumn 2006. Using electrofishing, one hundred two specimens were collected in two rivers (forty one from Shirinrud, thirty one from Ashekrud, thirty from Kelyareh). Twenty nine morphometric and seven meristic characters were analysed. Using PCA, the best separating characters of populations were determined. Among the morphometric characters, six factors accounted for about 79% of variation within individuals of the three populations including: head width, inter orbital length, predorsal length, pecto-ventral length, mandibular length, total length, head length , eye diameter , pectoral fin length, head depth, postdorsal length , post ventral length ,caudal peduncle length, post anal Length, Adipose fin length. In the case of meristic characters, three factors accounted for 60% of variation within populations including: anal fin ray, gill rackers, dorsal fin ray. The results showed that meristic characters are more important than morphometric characters in serparation of populations.