Journal of the Persian Gulf (Marine Science)/Vol. 9/No. 33/ September 2018/5/19-23 Issue of Second International Conference on Oceanography for West Asia (RCOWA) 2020 19 Length-weight relationship of black pomfret (Parastromateus niger) in the coastal waters of Qeshm Island, Hormozgan Province, Iran Hasan Sahraei 1 *, Hadi Raeisi 1 , Mojtaba Pouladi 2 , Ahmadreza Pirali Zefrehei 3 1 Department of Fisheries, Faculty of Natural Resources and Agriculture, Gonbad Kavous University, Gonbad Kavous, Iran 2 Iran Fisheries Organization, Bushehr, Iran 3 Department of Fisheries and Environmental Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Golestan, Iran Abstract Length-weight relationship (LWR) was estimated for 86 caught black pomfret by trawl net in Qeshm Island located in the Persian Gulf in in March 2017. The total length and total weight of the fish ranged from 15.8 to 56.2 cm and 69 to 3128 g, respectively. The mean total length and total weight were 25.08 ± 0.76 cm and 358.93 ± 52.22 g, respectively. LWR for black pomfret was W = 0.0267L 2.875 (R 2 = 0.975). The results obtained can be valuable for improvement of the technical performances related to fisheries management in the future. © 2018 Published by INIOAS Keywords: Black pomfret, Length-weight relationship, Trawl net, Qeshm Island, Persian Gulf. 1. Introduction Black pomfret fish belong to the Carangidae family and Benhtoplagic region of the continental shelf and are often caught by gill nets and trawls. This fish’s stocks are declining due to increased pollution and improper exploitation. This fish generally feeds on zooplankton, eggs and baby fish and lives at depths of 15 to 40 meters above the bottom of mud beds. In addition to the Persian Gulf and the Sea of Oman, the distribution of this fish includes North Africa, Mozambique, Kenya, the Arabian Sea, Japan, Australia and the Philippines, but it is most common on the west coasts of India and Indonesia. Black pomfret grows to 75 cm in total length (TL) and is essential to local commercial fisheries (Froese and Pauly, 2019). Length-weight relationship (LWR) is necessary in fisheries surveys to assess the fish stock structure, variation in body form, growth performance and fisheries management (Froese 2006; Saberi et al. 2017; Pouladi et al. 2020). It has been used in the comparison of morphological features and life-cycle of the fish in various ecological environments (Chuctaya et al. 2018; Lelli et al. 2018; Paighambari et al. 2018). Scientists usually record the length of fish rather than the weight, since it is much more reliable to measure (Torres et al. 2012; Pouladi et al. 2020). Hence, LWRs are essential to convert total length into total body weight for computing biomass (Siddik et al. 2016; Pouladi et al. 2018). The study aimed to prepare baseline information on LWR of * Corresponding Author name: Hasan Sahraei E-mail address: hasansahraei22@gmail.com Downloaded from jpg.inio.ac.ir at 23:59 IRST on Tuesday November 23rd 2021