Age structure and growth rate of (Squalius cephalus Linnaeus, 1758) in Tuji tributary from Talar River, Mazandaran Province

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Abstract

A structure and growth pattern of Squalius cephalus (Linnaeus, 1758) in Tuji tributary of
Talar River, Mazandaran Province, was studied during the period from August 2008 till
August 2009. In total, 298 fish were caught by electrofishing and fixed in 10% formalin. The
weight and length of fish were measured and the age was determinated by scallometric
method. The age data showed that fishes were between 0+ to 4+ age groups. Pauli`s applied
growth pattern showed a positive alometric for male and female and total fish and a negative
isometric for unmature fishes. The average instantaneous growth rate of European Chub
showed that the age groups 2+ and 3+ with 1.1 had the fastest growth compare to 3+ and 4+ age
groups with 0.89. Condition factor of specimens showed that the highest one with 1.58 (r2
=
0.983) belong to females and the lowest with 1.17 (r2
= 0.901) belong to unmature fishes. The
total sex ratio (123 males to 115 females) showed no significant differences between them.

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Iranian Scientific Fisheries Journal
Volume 21, Issue 3 - Serial Number 80
November and December 2012
Pages 107-118

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