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

Ha, Vu Viet; Nhan, Tu Hoang

doi:10.1590/2675-2824073.25031

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ORIGINAL ARTICLE • Ocean Coast. Res. 73 • 2025 • https://doi.org/10.1590/2675-2824073.25031 linkcopy

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

Authorship SCIMAGO INSTITUTIONS RANKINGS

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 had isometric growth.

Keywords:
Length-weight relationships; Isometric growth; Condition factor; Fishes; Invertebrates

Group	Family	Species	Data Type	N	L range (cm)	W range (g)	Length Type
Fish	Carangidae	Atule mate (Cuvier, 1833)	FIS	22	11.4-16.5	21.4-80.3	FL
			PS	936	6.3-24.0	3.2-238.1	FL
			All	958	6.3-24.0	3.2-238.1
	Clupeidae	Sardinella gibbosa (Bleeker, 1849)	PS	1,090	5.2-16.0	1.6-51.9	FL
	Engraulidae	Encrasicholina heteroloba (Rüppell, 1837)	PS	1,119	4.3-8.0	0.6-4.8	FL
	Mullidae	Mulloidichthys vanicolensis (Valenciennes, 1831)	FIS	1,325	5.1-15.2	2.6-61.8	FL
	Mullidae	Upeneus tragula (Richardson, 1846)	FIS	263	5.3-9.8	2-18.6	FL
	Nemipteridae	Nemipterus mesoprion (Bleeker, 1853)	FIS	75	6-13.8	4.1-42.5	FL
	Nemipteridae	Scolopsis taenioptera (Cuvier, 1830)	FIS	460	5.2-21.5	4.3-146.5	FL
	Scombridae	Euthynnus affinis (Cantor, 1849)	PS	154	16.8-38.1	75.8-930	FL
	Scombridae	Rastrelliger brachysoma (Bleeker, 1851)	PS	1,186	7.1-21.2	3.5-167	FL
	Sciaenidae	Dendrophysa russelii (Cuvier, 1829)	FIS	64	6.3-12.0	2.3-21.9	TL
			PS	1,081	7.5-16.3	4.5-60.0	TL
			All	1,145	6.3-16.3	2.3-60.0
		Pennahia anea (Bloch, 1793)	FIS	89	7.2-18.4	4.4-84.4	TL
	Synodontidae	Saurida elongata (Temminck & Schlegel, 1846)	FIS	152	7-17.8	2.9-62.1	FL
		Saurida undosquamis (Richardson, 1848)	FIS	408	5.3-26.4	1.2-159.7	FL
			PS	1,025	8.8-27.5	3.5-209.3	FL
			All	1,433	5.3-27.5	1.2-209.3
Cephalopod	Sepiidae	Sepiella inermis (Van Hasselt, 1835)	FIS	50	3-7.9	5.8-82.2	ML
			PS	1,143	1.8-12.3	0.9-224.3	ML
			All	1,193	1.8-12.3	0.9-224.3
Crustacean	Penaeidae	Parapenaeopsis maxillipedo (Alcock, 1905)	PS	953	4.2-10.0	1.2-15.2	BL
Crustacean	Portunidae	Portunus pelagicus (Linnaeus, 1758)	PS	1,132	5.8-14.2	11.9-231.6	CW
Total		16	12,727

Species	Sex	N	a	b	CI (b)	SE (b)	r²	Mean of Kn	SE of Kn	GT
Atule mate	All	958	0.01306	3.074	3.046-3.103	0.014	0.98	1.613	0.004	A⁺
	F	431	0.01421	3.045	2.998-3.092	0.024	0.97	1.619	0.006
	M	476	0.01346	3.063	3.011-3.116	0.027	0.97	1.614	0.006
	Juv	51	0.00928	3.212	3.11-3.314	0.051	0.99	1.554	0.015
Dendrophysa russelii	All	1145	0.0059	3.291	3.253-3.33	0.02	0.96	1.223	0.004	A⁺
	F	699	0.00618	3.275	3.223-3.327	0.026	0.96	1.234	0.005
	M	435	0.00568	3.303	3.238-3.367	0.033	0.96	1.210	0.007
	Juv	11	0.00291	3.636	2.855-4.417	0.345	0.92	1.071	0.047
Encrasicholina heteroloba	All	1119	0.00666	3.131	3.079-3.183	0.027	0.93	0.856	0.003	A⁺
	F	511	0.00681	3.114	3.036-3.192	0.04	0.92	0.848	0.005
	M	608	0.00659	3.14	3.07-3.21	0.036	0.93	0.863	0.004
Euthynnus affinis	All	154	0.00784	3.217	3.171-3.262	0.023	0.99	1.553	0.009	A⁺
	F	19	0.01023	3.147	2.939-3.355	0.099	0.98	1.690	0.017
	M	21	0.01276	3.073	2.803-3.344	0.129	0.97	1.652	0.019
	Juv	114	0.00817	3.202	2.965-3.44	0.12	0.86	1.512	0.008
Mulloidichthys vanicolensis	All	1325	0.01425	3.093	3.059-3.126	0.017	0.96	1.762	0.005	A⁺
	F	755	0.01447	3.088	3.043-3.133	0.023	0.96	1.772	0.007
	M	533	0.0131	3.128	3.074-3.182	0.028	0.96	1.747	0.008
	Juv	37	0.1041	2.05	1.462-2.639	0.29	0.59	1.749	0.057
Nemipterus mesoprion	All	75	0.02001	2.948	2.828-3.068	0.06	0.97	1.791	0.018	I
	F	29	0.01614	3.048	2.737-3.358	0.151	0.94	1.808	0.029
	M	24	0.02297	2.885	2.686-3.084	0.096	0.98	1.782	0.028
	Juv	22	0.05279	2.459	2.029-2.889	0.206	0.88	1.780	0.039
Pennahia anea	All	89	0.01654	2.924	2.82-3.029	0.053	0.97	1.343	0.024	I
	F	22	0.00684	3.3	2.99-3.61	0.149	0.96	1.369	0.020
	M	21	0.01378	2.996	2.885-3.107	0.053	0.99	1.454	0.020
	Juv	46	0.02125	2.818	2.427-3.208	0.194	0.83	1.343	0.024
Rastrelliger brachysoma	All	1186	0.00343	3.528	3.509-3.548	0.01	0.99	1.412	0.006	A⁺
	F	404	0.00821	3.224	3.147-3.302	0.039	0.94	1.551	0.006
	M	383	0.00588	3.341	3.263-3.418	0.04	0.95	1.534	0.007
	Juv	399	0.00758	3.178	3.133-3.223	0.023	0.98	1.154	0.004
Sardinella gibbosa	All	1090	0.00718	3.225	3.182-3.267	0.022	0.95	1.236	0.004	A⁺
	F	529	0.01216	3.012	2.94-3.083	0.036	0.93	1.257	0.005
	M	467	0.01206	3.013	2.922-3.103	0.046	0.9	1.250	0.006
	Juv	94	0.01359	2.87	2.736-3.003	0.067	0.95	1.040	0.007
Saurida elongata	All	152	0.00702	3.115	3.034-3.196	0.041	0.97	0.929	0.009	A⁺
	F	33	0.00364	3.365	3.193-3.537	0.084	0.98	0.926	0.018
	M	52	0.00611	3.168	3.037-3.3	0.065	0.98	0.942	0.011
	Juv	67	0.01104	2.912	2.469-3.355	0.222	0.73	0.920	0.017
Saurida undosquamis	All	1433	0.00615	3.124	3.093-3.154	0.015	0.97	0.879	0.004	A⁺
	F	723	0.00644	3.107	3.054-3.16	0.027	0.95	0.884	0.005
	M	649	0.00814	3.028	2.979-3.077	0.025	0.96	0.888	0.005
	Juv	61	0.03317	2.275	1.969-2.581	0.153	0.79	0.728	0.014
Scolopsis taenioptera	All	463	0.02425	2.877	2.836-2.919	0.021	0.98	1.797	0.013	A^-
	F	339	0.02123	2.93	2.879-2.982	0.026	0.97	1.785	0.007
	M	111	0.01946	2.959	2.916-3.003	0.022	0.99	1.766	0.012
	Juv	10	0.01477	3.09	2.295-3.886	0.345	0.91	1.787	0.056
Upeneus tragula	All	263	0.01016	3.263	3.141-3.386	0.062	0.91	1.754	0.012	A⁺
	F	140	0.01104	3.228	3.045-3.411	0.092	0.9	1.780	0.016
	M	102	0.01126	3.208	2.977-3.444	0.117	0.88	1.736	0.020
	Juv	21	0.00882	3.328	2.959-3.698	0.176	0.95	1.663	0.035
Sepiella inermis	All	1193	0.34541	2.613	2.576-2.649	0.019	0.94	18.130	0.130	A^-
	F	483	0.30571	2.685	2.625-2.745	0.03	0.94	17.459	0.160
	M	543	0.35183	2.596	2.523-2.668	0.037	0.9	17.608	0.153
	Juv	167	0.55429	2.255	2.07-2.44	0.094	0.78	21.765	0.553
Parapenaeopsis maxillipedo	All	953	0.01662	2.937	2.889-2.984	0.024	0.94	1.481	0.005	A^-
	F	640	0.01723	2.929	2.873-2.984	0.028	0.94	1.509	0.006
	M	313	0.02199	2.764	2.674-2.854	0.046	0.92	1.424	0.009
Portunus pelagicus	All	1132	0.03958	3.228	3.186-3.269	0.021	0.95	6.621	0.024	A⁺
	F	514	0.04519	3.161	3.098-3.224	0.032	0.95	6.495	0.033
	M	618	0.03726	3.26	3.206-3.314	0.027	0.96	6.724	0.033

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