Int. J. Aquat. Biol. (2018) 6(6): 340-342 ISSN: 2322-5270; P-ISSN: 2383-0956 Journal homepage: www.ij-aquaticbiology.com © 2018 Iranian Society of Ichthyology Short Communication Length‐weight relationship for two flounder species from Iranian waters of the Persian Gulf Azad Teimori*1 Department of Biology, Faculty of Sciences, Shahid Bahonar University of Kerman, 76169-14111 Kerman, Iran. Article history: Received 1 November 2018 Accepted 20 December 2018 Available online 2 5 December 2018 Keywords: LWR, Flounder species, Persian Gulf, Pseudorhombus, Solea. Abstract: The length-weight (LWR) relationship was estimated for the first time for two flounder species viz. Pseudorhombus elevatus Ogilby, 1912 and Solea elongata Day, 1877 from Iranian waters of the Persian Gulf. Fishes were collected using fishing boat during August to December 2017. No information is available in FishBase regarding the LWRs of these species. The b values of the LWR was 2.98 for P. elevatus and 3.10 for C. elongate, and the r2 values are 0.996 and 0.989, respectively. These estimates can be used for estimation of biomass of the studied fishes employing length frequency distributions. Introduction Among the fish body parameters, the length is often more easily measured factor in field studies; therefore, it can be used to estimate biomass. By taking account of this issue, to date, numerous studies have addressed length‐weight relationships (LWRs) as useful tool for conservation and stock assessment of freshwater and marine fishes (Hossain et al., 2014; Mousavi-Sabet et al., 2014; Esmaeili et al., 2015; Zamani-Faradonbe et al., 2015a, b; Keivany et al., 2016; Akhtar and Khan, 2018), studying comparative growth of fishes in fisheries management (Panase and Mengumphan, 2015; Rábago-Quiroz et al., 2017), and in environmental monitoring programs (Froese, 2006). This study provides length–weight data for two flounder species collected from Iranian waters of the Persian Gulf, which have not LWR information available in FishBase (http://www.fishbase.org). Materials and Methods Fish species were collected using fishing boat during August to December 2017 from the Iranian waters of the Persian Gulf, Southern Iran. The sampling locations lie between 27°03’16.98"N 56°11'24.05"E to 27°03'32.98"N 56°20'40.06"E. Specimens were *Corresponding author: Azad Teimori DOI: https://doi.org/10.22034/ijab.v6i6.578 E-mail address: a.teimori@uk.ac.ir measured to the nearest 0.05 mm total length (TL) using a vernier caliper and weighed to the nearest 0.001 g (total weight, TW). Reference specimens from each fish species were preserved in ethanol (after fixing in formalin) in the Zoological Museum of Shahid Bahonar University of Kerman (ZM-SBUK). The parameters of the length-weight relationship W = aTLb were estimated by linear regression of the log- transformed weight and length (Koutrakis and Tsikliras, 2003), where W is the total weight (g), TL is the total length (cm), a is the intercept, and b is the slope. Prior to regression analysis, log-log plots of the length–weight pairs were performed for visual inspection of outliers (Froese et al., 2011). Extreme outliers were excluded from the analysis. The 95% confidence limits for b were calculated to see if the hypothetical value of isometry (i.e., 3) fell between these limits. All statistical analyses were performed in Excel 2018. Results Totally, one hundred and eleven specimens were used to estimate the length weight relationships (LWRs) of the studied species. The results of the estimated values of LWR including; length range, weight range, a, b, 341 Int. J. Aquat. Biol. (2018) 6(6): 303-306 95% Cl of a, 95% Cl of b and r2 for two species are presented in Table 1. The obtained intercept (a) and growth coefficients (b) were 0.008 and 2.98 for P. elevatus, 0.004 and 3.10 for C. elongate, respectively. The regression values were highly significant (P<0.005). Discussion Our results indicated that “b” values of the LWR were 2.98 and 3.10, for P. elevatus and C. elongate, respectively. The estimated b values of the regression for these species were within the expected range for teleost fishes between 2.5 and 3.5 (Froese, 2006; Carlander, 1969). Like any other LWR data, the presented estimates can be used for estimation of biomass of the studied fishes employing length frequency distributions. The results of present study are useful for common fisheries investigations. Acknowledgments Shahid Bahonar University of Kerman (SBUK) is acknowledged for its financial support. We also wish to thank local people in Bandar Abbas for their help during fish sampling. References Akhtar N., Khan M.F. (2018). 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