In the present study, the length-weight relationships (LWRs) of 148 specimens representing four species, including 20 specimens of Pseudorhombus javanicus, 70 Plicofollis dussumieri, 28 Scarus persicus and 30 S. fuscopurpureus collected from the Persian Gulf were estimated. The LWRs equations were found as W= 0.67×L 2.23 for P. javanicus, W= 0.05×L 2.38 for P. dussumieri, W= 0.62×L 2.15 for S. persicus and W= 0.27×L 2.41 for S. fuscopurpureus. The values of b ranged from 2.15 (S. persicus) to 2.41 (S. fuscopurpureus), with the coefficient of determination (r 2 ) greater than 0.85. The present study presents the LWRs parameters for P. javanicus from the Persian Gulf, Iran for the first time and provides useful information for marine ecologists, fishery managers, the conservation of marine fishes, and the online database of FishBase.

Abstract. In this study, for the first time, we provide morphometric and meristic data on Petroleuciscus ulanus from the Lake Urmia basin by comparing them in the populations of the Mahabad-Chai and Godar-Chai rivers. For this purpose, a total of 100 specimens were collected using electrofishing device and cast net during 2014 and 2015. 19 morphometric and 8 meristic traits were measured and counted, respectively. The meristic traits of the two populations showed significant differences in three characters, including branched dorsal and ventral fin rays and lateral line scales (P<0.05). In addition, the morphometric analysis showed significant differences in head length, eye diameter, caudal peduncle length, dorsal fin height and base lengths, pectoral and ventral fin lengths, anal fin base and height lengths (P<0.05). The finding of the current study can help to further studies on the biological features of this endemic species of Iranian inland waters.

Length‐weight and length‐length relationships were estimated for three species of the genus Squalius. These fish were sampled from the Caspian Sea as well as the Namak and Tigris basins of Iran. Sampling took place between July 2009 and August 2010 using a seine net (15 m long, 2 m width and 5 mm mesh size). The values of the b parameter in the length‐weight relationship equations were determined as 3.37 for S. turcicus, 3.25 for S. namak and 3.14 for S. berak (b > 3).

This study was conducted to provide length-weight (LWRs), length-length (LLRs) relationships and condition factor of Oxynoemacheilus seyhanensis from seven habitats belonging to three inland water basins of Turkey. A total of 166 specimens were collected from Yıldızeli, Taşköprü, Suşehri (Kızılırmak basin), Büyükpotuklu, Pınarbaşı and Örenşehir (Seyhan basin) and Akdağmadeni (Yeşilırmak basin) rivers during 2017-2019. The mean (±SE) of the total, fork lengths and weight were calculated as 6.49±1.59 cm, 6.35±1.60 cm and 3.47±2.41 g, respectively. b constant of LWRs ranged from 2.29 (Suşehri) to 3.52 (Büyükpotuklu), showing growth pattern of positive allometric in all studied populations except Suşehri (negative allometric), Pınarbaşı (ısometric) and Örenşehir (isometric) population. Condition factor was ranged from 0.92 (Pınarbaşı) to 1.15 (Örenşehir). In all length-weight and length-length relationships with r2 were higher than 0.91. The results of above-mentioned parameters for this deep-bodied stone loach showed that wide range of b-value shows morphological flexibility of this species in different habitats.

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