Development of empirical standard weight equation for Pursak chub Squalius pursakensis, an endemic cyprinid species of Northwest Anatolia

Authors : Şule SÜLÜN, Sercan BAŞKURT, Özgür EMİROĞLU, Daniela GIANNETTO, Ali Serhan TARKAN

Pages : 582-589

Doi:10.3906/zoo--1311-24

View : 27 | Download : 8

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Indices of condition enable the evaluation of the well-being of fish, with the assumption that heavier fish of a given length are in a better condition. Relative weight insert ignore into journalissuearticles values(Wr); is one of these indices; it is calculated by comparing the actual weight of a specimen with the ideal weight of a specimen in good physiological condition of the same length from the same species, i.e. standard weight insert ignore into journalissuearticles values(Ws);. In this research, length and weight data over the distribution range for Pursak chub Squalius pursakensis, an endemic species distributed in the Sakarya and Porsuk drainages in Northwest Anatolia insert ignore into journalissuearticles values(Turkey);, were used to compute a Ws equation by means of the empirical percentile insert ignore into journalissuearticles values(EmP); method. The Ws equation obtained was log10 Ws = -4.657 + 2.614 log10 TL + 0.127 insert ignore into journalissuearticles values(log10 TL);2, and the total length range of application was 80-340 mm. Since the EmP Ws equation was not influenced by length variation, the use of this equation to compute the relative weight insert ignore into journalissuearticles values(Wr); for S. pursakensis throughout its area of distribution is suggested.
Keywords : Condition indices, endemic species, Squalius, relative weight