Length-weight relationships for 10 elasmobranch species from the Oman Sea

Abstract

Length-weight relationships (LWRs) were estimated for ten elasmobranch species from Iranian waters of the Oman Sea. All specimens were collected by bottom trawl (mesh size 80 mm in the cod end) between May and December 2014. A total of 509 individuals (107 Torpedo sinuspersici, 68 Rhinobatos punctifer, 63 Chaenogaleus macrostoma, 72 Himantura walga, 80 Himantura gerrardi, 58 Gymnura poecilura, 4 Himantura uarnak, 4 Rhinoptera javanica, 14 Aetobatus flagellum, and 39 Pastinachus sephen) were sampled and studied. Results showed that most species had positive allometric or isometric growth but that more studies were needed for final decisions on growth patterns. Both the disk length-body weight (DL/BW) and disk width-body weight (DW/BW) relationships also showed a good fit, reinforcing the credibility of the data in relation to the LWRs. This study is the first report of LWRs for these elasmobranchs in the northern Oman Sea.

Length-weight relationship of selected elasmobranch species from north-eastern Arabian Sea, India

“…The “ b ” values of batoid fishes selected for the study was comparable with the other works of Yeldan & Avsar, ; Rastgoo, Fatemi, Valinassab, & Mortazavi, and Naderi, Zare, & Azvar, ; done in Cilician Basin shelf waters, Oman Sea and Persian gulf. The maximum disc width of B. imbricata recorded in fish base is 25 cm (male), (Froese & Pauly, ) while present study recorded 31 cm (female) for the same species caught by trawl net.…”

Length-weight relationships of four small indigenous fish species from an inland artisanal fishery, Bangladesh

“…Sufficient numbers of samples for each species between juvenile and adult stages were examined to attain a better species-specific estimate, resulting in higher r 2 values for the regressions (Rastgoo, Fatemi, Valinassab, & Mortazavi, 2016;Siddik, Hanif, Chaklader, Nahar, & Mahmud, 2016). The regression parameter b of LWRs for each reported species was found within the expected normal range of 2.5 < b < 3.5, as compared to the Bayesian LWRs predictions approach in FishBase (Froese, 2006).…”

Length-weight relationships of Acanthopagrus longispinnis (Valenciennes, 1830), Raconda russeliana (Gray, 1831) and Coilia neglecta (Whitehead, 1967) from the Bay of Bengal coast, Bangladesh

“…During the study period, specimens of each species from juvenile and adult stage were examined to attain a better species‐specific estimate (Rastgoo, Fatemi,Valinassab, & Mortazavi, ; Siddik et al, ). The estimated values of coefficient of allometry ( b ) of three species remained within the expected limits of 2.5 to 3.5, which are in line with the finding of other researchers (Froese, ; Siddik, Hanif, & Chaklader, ; Siddik, Hanif, Chaklader, Nahar, & Mahmud, ; Siddik, Hanif, Nahar, Chaklader, & Kleindienst, ).…”