Stock Status and Management of Greenback mullet, Planiliza subviridis in the East Hammar marsh, Iraq
Article Main
Abstract
Assessing the various parameters of population dynamics is crucial for managing fish stocks. In this context, the present study analysed the growth, mortality, recruitment, yield-per-recruit, and virtual population analysis (VPA) parameters of Planiliza subviridis inhabiting the East Hammar marsh, in Iraq, using FiSAT II software. 3,429 specimens of P. subviridis measuring between 12.3 and 30.0 cm in total length (TL) and weighing between 21.1 and 303.5 g were sampled from November 2022 to October 2023. The length-weight relationship, expressed as W= 0.0142*TL2.928 exhibited negative allometric growth. The growth parameters, including asymptotic length (L∞) and the growth constant (K), were calculated as 33.0 cm and 0.33, respectively. The length at first maturity was higher than the size at first capture. Mortality estimates indicated total mortality (Z) at 1.91, natural mortality (M) at 0.79, and fishing mortality (F) at 1.12, resulting in an exploitation rate (E) of 0.58. Recruitment of P. subviridis continued throughout the year, with one prominent peak in June. The relative yield per recruit analysis indicated that the current exploitation rate (Ecur= 0.58) is below the biological target reference points for the species (E0.1= 0.609) and (Emax= 0.748), suggesting that the studied stock is under-exploited. VPA results showed that mid-length (19 cm) was the highest fishing mortality (1.563). For effective management, it is essential to adjust net mesh sizes and adopt sustainable fishing practices to fulfil the criteria for good management (Lc50 < Lm50), ensuring the long-term sustainability of P. subviridis in this feeding region.
Article Details
Article Details
Keywords
East Hammar marsh, Growth and mortality, Iraq, Planiliza subviridis , Yield-per-recruit
References
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Hussain NA, Mohamed ARM, Al-Noor SS, Mutlak FM, Abed, I M & Coad BW. (2009). Structure and ecological indices of fish assemblages in the recently restored Al-Hammar Marsh, Southern Iraq. Bio Risk, 3, 173-186. doi.org/10.3897/biorisk.3.11fatcat: od5zucwvbjaqzpo6qwrds3insu
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Jones R & van Zalinge NP. (1981). Estimations of mortality rate and population size for shrimp in Kuwait waters. Kuwait Bulletin of Marine Sciences, 2, 273-288.
Kebtieneh N, Alemu Y & Tesfa M. (2016). Stock assessment and estimation of maximum sustainable yield for tilapia stock (Oreochromis niloticus) in Lake Hawassa, Ethiopia. Agriculture, Forestry and Fisheries, 5(4): 97-107. doi.org/10.11648/j.aff.20160504.12
Langsa NS, Sulmartiwi L & Lutfiyah L. (2021). Food habits of greenback mullet Liza subviridis at Lampon Estuary, Banyuwangi, East Java. The 3rd international conference on fisheries and marine sciences IOP Conf. Series: Earth and Environmental Science 718 (2021) 012085 IOP Publishing. doi.org/10.1088/1755-1315/718/1/012085 1
Lassen H & Medley P (2001). Virtual population analysis. A practical manual for stock assessment. FAO Fisheries Technical Paper. No. 400. Rome, FAO. 129p.
Le Cren ED. (1951). The length-weight relationship and seasonal cycle in gonad weight and condition in the perch (Perca fluviatilis). Journal of Animal Ecology, 20, 201-219. doi.org/10.2307/1540
Mili S, Ennouri R, Chhibi M, Laouar H, Romdhane N & Missaoui H. (2017). Length-weight relationships (LWRs) of endemic and introduced freshwater fish species in 13 Tunisian reservoirs. Journal of New Sciences, Agriculture and Biotechnology, 41(8), 2253-2259.
Mohd Rosli NA (2012). Population biology of greenback grey mullet, Chelon subviridis (Valenciennes, 1836) in Merbok estuary, Kedah, Malaysia. MSc. thesis, Universiti Sains Malaysia.
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Stock Status and Management of Greenback mullet, Planiliza subviridis in the East Hammar marsh, Iraq. (2026). Journal of Applied and Natural Science, 18(1), 105-116. https://doi.org/10.31018/jans.v18i1.7219
