Int. J. Aquat. Biol. (2016) 4(6): 387-390; DOI: ISSN: 2322-5270; P-ISSN: 2383-0956 Journal homepage: www.ij-aquaticbiology.com © 2016 Iranian Society of Ichthyology Short Communication Length-weight and length-length relationships for six fish species from Zohreh River, Iran Yazdan Keivany*,1Mazaher Zamani-Faradonbe Department of Natural Resources (Fisheries Division), Isfahan University of Technology, Isfahan, 84156-83111, Iran. Article history: Received 17 August 2016 Accepted 11 November 2016 Available online 2 5 December 2016 Keywords: Cyprinidae Cyprinodontidae Sillaginidae Sisoridae Abstract: The present study reports Length-weight and length-length parameters for six fish species belonging to four families from the Zohreh River. The weight-length relationships were estimated using the equation W= 𝛼Lb. The values of the slope parameter (b) varied between 2.72 and 3.72, with a mean±SD of 3.015±0.18. The values b parameter in the length-weight relationship equations were calculated as 2.72 for Arabibarbus grypus (Heckel, 1843), 2.96 for Capoeta trutta (Heckel, 1843), 2.72 for Garra rufa (Heckel, 1843), 3.25 for Aphanius dispar (Rüppell, 1829), 2.91 for Sillago sihama (Forsskål, 1775) and 3.15 for Glyptothorax silviae Coad, 1981. This study presents the first reference on LWR and LLR for these species in Zohreh River. Introduction The length-weight relationships (LWRs) of fishes are commonly used to estimate the weight of a specimen from its length and vice versa (Binohlan and Pauly, 1998; Keivany et al., 2015). In addition, LWRs of fishes are important in fisheries and biology (Sarkar et al., 2008) and ecology of fishes (Froes, 2006). LWRs are also applied for evaluation of fish stocks and give information on their growth and condition patterns (Ricker, 1968), estimate biomass of the standing stock (Martin-Smith, 1996), condition indices, ontogenetic changes (Sarafan, 1992) and growth studies (Garcia et al., 1989; Haimovici and Velasco, 2000; Moutopoulos and Stergion, 2002). Length-length relationships (LLRs) are useful for standardization of length type when data are summarized (Froes, 1998) and are also functional for comparative growth studies (Moutopoulos and Stergiou, 2002). Length-weight relationships were reported for many freshwater fishes of Iran (Gerami et al., 2014; Hasankhani et al., 2014; Keivany et al., 2015; 2016; 2016; Keivany and Zamani Faradonbe, 2016; Tabatabaei et al., 2015; Zamani Faradonbe et al., 2015a, b; Radkhah and Eagderi, 2015), but such * Corresponding author: Yazdan Keivany E-mail address: keivany@cc.iut.ac.ir a data for fishes of the Zohreh River are limited. Therefore, the present study aimed to reports length- weight and length-length relationships’ parameters of six fish species from the Zohreh River, a sub-basin of the Tigris basin in the Khuzestan Provinces, southwestern Iran. Materials and Methods A total of 114 specimens belonging to six species were collected by electrofishing device and net from the Zohreh River, Persian Gulf basin, Iran. The collected specimens were preserved in 10% buffered formalin and transferred to the laboratory for subsequent analyses. The total length (TL), fork length (FL) and standard length (SL) of specimens were measured with a digital caliper to the nearest 0.1 cm (length, L) and weight with a digital balance to the nearest 0.01 g (weight, W). Length-weight relationships were determined by applying the equation W=𝛼Lb, where W is the total body weight (g), L is the total body length (cm), 𝛼 is the intercept and b is the slope (Le Cren, 1951; Ricker, 1975; Froese, 2006; Froese et al., 2011). The length-length relationship was estimated by linear regression analysis: TL=𝛼+b*SL and SL=𝛼+b*FL, where 𝛼 388 Keivany and Zamani-Faradonbe/ LWRs and LLRs for six fish species from Zohreh River, Iran parameter is the intercept and b parameter is the slope of the linear regression (Cao et al., 2015). Results and Discussion This study increases the information related to LWRs and LLRs for six fish species inhabit in the Zohreh River. The number of samples, minimum and maximum of total length (cm), minimum and maximum of weight (g), length-weight relationships parameters (𝛼, 95%CI-𝛼, b and 95%CI-b) and the coefficient of determination (r2) are presented in Table 1 and length-length relationships parameters (𝛼 and b) and the coefficient of determination (r2) are presented in Table 2. The maximum value for b parameter in LWRs was 3.24 for Aphanius dispar and minimum value was 2.72 for Garra rufa. Froese (2006) expressed that the parameter b should normally range between 2.5 to 3.5 and Tesch (1971) reported values of b parameter varies usually between 2 and 4. In this study, the values b ranged from 2.72 for G. rufa to 3.24 for A. dispar, so the parameters can be used safely within the indicated length ranges. This study showing that linear regressions on data are highly significant (P<0.01) with all r2>0.905. The b values of LWRs that indicate allometric or isometric growth pattern and the 𝛼 parameter was close to 0.01, which is suggested as normal by Froese (2006) for fusiform fish species. Bibak et al. (2013) reported that for Arabibarbus grypus in Dalaki River and G. rufa in Shahpur River, the b parameter were 2.93 and 3.242, respectively and the values of b parameter for G. rufa were 3.10 in Tigris drainage, 3.02 in Karkheh drainage, 3.06 in Karun drainage, 3.06 in Persis basin and 3.34 in Hormuz basin, respectively (Keivany et al., 2015), while our study b parameter for this species was 2.94 Table 1. Length-weight relationships parameters for six fish species collected from Zohreh River, Iran. Family/species n TL (cm) min-max W (g) min-max Parameters 𝛼 % CI-a (mean±SE) b % CI-b (mean±SE) r2 Cyprinidae Arabibarbus grypus 32 3.3-8.1 0.2-3.72 0.0066 0.0064±0. 0017 2.94 2.91±0.08 0.98 Capoeta trutta 21 3.7-11.6 0.37-11.09 0.008 0.009±0.006 2.96 2.89±0.16 0.98 Garra rufa 30 3.0-7.2 0.22-2.58 0.012 0.011±0.001 2.72 2.75±0.065 0.98 Cyprinodontidae Aphanius dispar 10 2.6-3.5 0.22-0.57 0.0105 0. 026±0. 58 3.24 3.22±0.16 0.97 Sillaginidae Sillago sihama 12 6.2-11.3 0.79-5.06 0.0026 0.0068±0.0033 3.15 2.72±0.12 0.96 Sisoridae Glyptothorax silviae 9 2.9-4.8 0.15-0.84 0.0058 0.006±0.0018 3.08 3.09±0.099 0.97 Table 2. Length–length relationship for six fish species from Zohreh River, Iran. Species Equation 𝛼 b r2 Arabibarbus grypus TL = a + bSL 0.1373 1.256 0.99 SL = a + bFL -0.2696 0.93 0.99 Capoeta trutta TL = a + bSL 0.2767 1.207 0.99 SL = a + bFL -0.2567 0.937 0.99 Garra rufa TL = a + bSL 0.1078 1.206 0.99 SL = a + bFL -0.0889 0.914 0.99 Aphanius dispar TL = a + bSL -0.055 1.209 0.99 SL = a + bFL - - - Sillago sihama TL = a + bSL 0.2175 1.13 0.99 SL = a + bFL 0.1306 0.865 0.99 Glyptothorax silviae TL = a + bSL -0.0437 1.27 0.98 SL = a + bFL 0.1085 0.855 0.99 389 Int. J. Aquat. Biol. (2016) 4(6): 387-390 and 2.72. The b parameter was 2.9475 and 2.9475 in male and female of C. trutta of shour river (Taghavi Niya et al., 2015) and were 30149 in male, 3.0003 in female and 3.0065 in overall of C. trutta in Shour River downstream (Baboli et al., 2012), whereas b parameter in this study was 2.93 for C. trutta. The b parameter for male, female and overall of A. dispar were 3.0745, 3.292 and 3.2053 from Dalaki river, respectively (Bibak et al., 2012), 3.03 and 2.98 for female and male in Sillago sihama (Mirzaei et al., 2013) and 3.045 for G. silviae (Gerami et al., 2014); however in this study b parameter was 3.24 for A. dispar, 3.15 for S. sihama and 3.08 for G. silviae. The variances observed in values of the length- weight relationship parameters in fishes is affected by a number of factors, including season, habitat, population, gonad maturity, sex, diet, stomach fullness, health, sample size, preservation techniques and locality (Tesch, 1971; Moutopoulos and Stergiou, 2002; Froese, 2006; Hasankhani et al., 2014; Zamani-Faradonbe et al., 2015). This is the report of LWRs and LLRs parameters for these species in the western Iran, thus the data serve as a baseline for further studies of a possible alteration in the biometric parameters. 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(2016) 4(6): 387-390 E-ISSN: 2322-5270; P-ISSN: 2383-0956 Journal homepage: www.ij-aquaticbiology.com © 2016 Iranian Society of Ichthyology چکیده فارسی ایران زهره، رودخانه در ماهی گونه شش طول-طول و وزن-طول رابطه ارزیابی فرادنبه زمانی مظاهر ،*کیوانی یزدان .ایران ،84156-83111 اصفهان، اصفهان، صنعتی دانشگاه ،(شیالت گروه) طبیعی منابع دانشکده1 چکیده: -طول رابطه. است گرفته قرار بررسی مورد زهره رودخانه در خانواده چهار به متعلق ماهی گونه شش طول-طول و وزن-طول رابطه مطالعه این در معادله در b پارامتر مقادیر. دارد قرار 72/3 و 72/2 مقادیر بین( b) خط شیب به مربوط مقادیر. گردید محاسبه =bL𝛼W رابطه از استفاده با وزن گونه برای ،96/2 برابر Capoeta trutta (Heckel, 1843) گونه برای ،72/2 برابر Arabibarbus grypus (Heckel, 1843) گونه برای وزن-طول Garra rufa (Heckel, 1843) گونه برای ،72/2 برابر Aphanius dispar (Rüppell, 1829) گونه برای ،25/3 برابر Sillago sihama (Forsskål, 1775) گونه برای و 91/2 برابر Glyptothorax silviae Coad, 1981 شده ارائه اطالعات اولین از مطالعه این. آمد بدست 15/3 برابر .باشدمی زهره رودخانه از ماهی گونه شش این طول-طول و وزن-طول رابطه مورد در .ماهیانگربه ماهیان،شورت ماهیان،کپوردندان کپورماهیان، :کلمات کلیدی