Summary Length–weight and length–length parameters were calculated for seven fish species belonging to five families in the Zohreh River, Iran. The weight–length relationships were estimated using the equation W = aLb. The b values varied between 2.72 and 3.33, with a mean ± SD of 2.88 ± 0.28. The b values parameter in the length–weight relationship equations were calculated as 3.15 for Alburnus mossulensis Heckel, 1843; 3.78 for Barilius mesopotamicus Berg, 1932; 2.86 for Cyprinion macrostomum Heckel, 1843; 2.89 for Nuchequula gerreoides (Bleeker, 1851); 2.80 for Mastacembelus mastacembelus (Banks & Solander, 1794); 2.72 for Liza abu (Heckel, 1843); and 3.19 for Paraschistura nielseni (Nalbant and Bianco, 1998). This study presents the first LWR and LLR references for these species in the Zohreh River.

Summary Length–weight and length–length relationships were estimated for eight fish species belonging to three families from the Jarrahi River in southwestern Iran. The study was performed between June 2009 and September 2011. Weight–length relationships were estimated using the logarithmic form of the equation W = aLb. The b values varied between 2.96 and 3.61 and determined as 3.42 for Alburnus mossulensis Heckel, 1843; 3.33 for Alburnoides idignensis Bogutskaya and Coad, 2009; 2.85 for Barbus grypus Heckel, 1843; 3.61 for Barilius mesopotamicus Berg, 1932; 3.16 for Cyprinion kais (Heckel, 1843); 3.36 for Cyprinion macrostomum Heckel, 1843; 3.27 for Paraschistura nielseni (Nalbant and Bianco, 1998); and 2.96 for Glyptothorax silviae Coad, 1981. This study presents the first LWR and LLR references for these species in the Jarrahi River.

Since osteological structures of fishes provide important biological and ecological information, studying these structures is valuable. On the other hand, due to lack of data on the osteology of stone lappers, the present study was conducted to provide detailed descriptive osteology of Garra rossica from Mashkid basin, southeastern Iran, comparing it with those of G. typhlops from the Bagh-e Loveh cave, Iran, G. rossica from Nahang River, Mashkid Basin, and G. persica from Zahak River, Sistan basin. For this purpose, 15 specimens of G. rossica were captured from Ladiz River, Mashkid Basin, using an electrofishing device, and fixed in 10% buffered formalin. Then, the specimens were cleared and stained with alcian blue and alizarin red for osteological investigations. A detailed description of the osteological features of G. rossica was provided. Based on the results, several differences were observed between the four species. G. rossica can be distinguished from G. typhlops, G. persica, and G. rossica based on the shape of suspensorium and opercular series, pharyngobranchial bones, ventral and pectoral girdles, caudal, dorsal, and anal fins skeleton, and shape and number of infraorbital elements.

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Garra hormuzensis, new species, is described from the Kol River drainage. It is distinguished from its congeners in the Iranian part of the Persian Gulf basin by having 7½ branched dorsal-fin rays, usually 9+8 branched caudal-fin rays, the breast, belly and back in front of the dorsal-fin origin covered by scales, and a free lateral and posterior margins of the gular disc. It is further characterised by having a minimum K2P distance of 1.16% to G. mondica in the mtDNA COI barcode region.

| INTRODUC TI ONThe length-weight (LWRs) and length-length (LLRs) relationships are useful for the prediction of weight from length and vice versa, assessment of fish stocks and obtaining information on the condition and that these species were listed in Esmaeili et al. (2017). Because the information for most endemic freshwater fish species is still missing, in this study, the parameters of the length-weight relationships are presented for four Garra species collected from 27 different localities. | MATERIAL S AND ME THODSThe specimens were collected using hand net (2 mm mesh size), cast net (5 mm mesh size) and also electrofishing in 27 different sites from different basins during the summers of 2017 and 2018.Captured fishes were preserved in 10% neutralized formalin and transferred to laboratory to measure their total length (TL), fork length (FL), standard length (SL) and total wet weight for each specimen. Measuring length was to the nearest 0.1 cm using a digital caliper and weight to the nearest 0.01 g using a digital scale. The length-weight relationships were determined by the method of least squares using the equation W = aL b (Wang, Wang, Sun, Huang, & Shen, 2012), where W was the weight of the fish in grams and L the length of the fish in millimeter, "a" parameter is the intercept and "b" parameter is the slope. The length-length relationships were estimated by linear regression analysis: TL = a + bSL and SL = a + bFL,where TL is total length, SL is standard length, FL is fork length, "a" parameter is the intercept and "b" parameter is the slope of the linear regression. The confidence limit at 95% was calculated for both a and b parameters. | RE SULTSSample size, body length, body weight and the length-weight relationship parameters (a, b, r 2 ) for each species are given in Table 1.Length-length relationships parameters ("a" and "b" parameters) and the coefficient of determination (r 2 ) are presented in Table 2. The b value in LWRs for these four species varied from 2.7 to 3.21. | D ISCUSS I ONThe exponent "b" in length-weight relationships should normally fall between 2.5 and 3.5 (Froese, 2006). The value of exponent "b" for G. amirhosseini was 3.21, for G. gymnothorax 3.11, for G. mondica 2.87 and for G. rosica 2.7, are in the normal range. Hashemzadeh Segherloo et al. (2015) reported the value of "b" for G. rufa between 2.74 to 3.19 with average of 2.99 in Tigris basin and 2.96 in AbstractThis study describes the length-weight and length-length relationships for four species of Garra, viz., G. amirhosseini, G. gymnothorax, G. mondica and G. rosica in Iranian basins. The specimens were collected using hand net, cast net and also electrofishing in 27 different sites from different basins from November 2017 to June 2018. Significantly different b values from the expected value in length-weight relationships were observed for all the species but one. The value of the parameter b varied between 2.70 and 3.21 among the species.

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