Length-weight relationships and relative condition factor of some commercially important fishes and invertebrates in the southwestern sea of Vietnam

Abstract

Length-weight relationships (LWRs) and relative condition factor (Kn) of some commercially-important fish and invertebrate species including Atule mate (Cuvier, 1833), Dendrophysa russelii (Cuvier, 1829); Encrasicholina heteroloba (Rüppell, 1837); Euthynnus affinis (Cantor, 1849); Mulloidichthys vanicolensis (Valenciennes, 1831); Nemipterus mesoprion (Bleeker, 1853); Pennahia anea (Bloch, 1793); Rastrelliger brachysoma (Bleeker, 1851); Sardinella gibbosa (Bleeker, 1849); Saurida elongata (Temminck & Schlegel, 1846); Saurida undosquamis (Richardson, 1848); Scolopsis taenioptera (Cuvier, 1830); Upeneus tragula Richardson, 1846; Sepiella inermis (Van Hasselt, 1835); Parapenaeopsis maxillipedo (Alcock, 1905); Portunus pelagicus (Linnaeus, 1758) were determined using 12,727 specimens collected from two fisheries independent surveys and monthly port sampling between November 2022 to October 2023. The slope (b) values of the LWRs ranged from 2.613 for S. inermis to 3.528 for R. brachysoma. Eleven species exhibited positive allometric growth, three had negative allometric growth and two species had isometric growth.