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
ALİ SERHAN TARKAN
SEVAN AĞDAMAR
ÖZCAN GAYGUSUZ
ZEYNEP DORAK
HAMDİ AYDIN
ARZU ÇİÇEK

DOI

10.3906/zoo-1311-24

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 (W_{r}) 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 (W_{s}). 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 (Turkey), were used to compute a W_s equation by means of the empirical percentile (EmP) method. The W_s equation obtained was log_{10} W_s = -4.657 + 2.614 log_{10} TL + 0.127 (log_{10} TL)^{2}, and the total length range of application was 80-340 mm. Since the EmP W_s equation was not influenced by length variation, the use of this equation to compute the relative weight (W_r) for S. pursakensis throughout its area of distribution is suggested.

Keywords

Condition indices, endemic species, Squalius, relative weight

First Page

582

Last Page

589

Recommended Citation

SÜLÜN, ŞULE; BAŞKURT, SERCAN; EMİROĞLU, ÖZGÜR; GIANNETTO, DANIELA; TARKAN, ALİ SERHAN; AĞDAMAR, SEVAN; GAYGUSUZ, ÖZCAN; DORAK, ZEYNEP; AYDIN, HAMDİ; and ÇİÇEK, ARZU (2014) "Development of empirical standard weight equation for Pursak chub Squalius pursakensis, an endemic cyprinid species of Northwest Anatolia," Turkish Journal of Zoology: Vol. 38: No. 5, Article 8. https://doi.org/10.3906/zoo-1311-24
Available at: https://journals.tubitak.gov.tr/zoology/vol38/iss5/8