Growth parameters of Poecilia latipinna (Lesueur, 1821) (Actinopterygii, Poeciilidae) – an introduced species in brackish water of Wadi Al-Bahayes (Oman)

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Measured and calculated average total length values for each age in the von Bertalanffy growth equation

Age (Year)	Observed average length (cm)	Expected average length (cm)	t test
1	4.34 ♂4.44 ♀	4.30 ♂4.37 ♀	p > 0.05
2	5.20 ♂5.13 ♀	5.15 ♂5.07 ♀	p > 0.05
3	5.93 ♂5.81 ♀	5.91 ♂5.73 ♀	p > 0.05
4	6.61 ♂6.41 ♀	6.57 ♂6.34 ♀	p > 0.05

Comparison of the growth parameters of Poecilia species reported in different studies

Species	Status	Locality	Ref.	N	TL (range)	W (range)	M:F	L∞	k	t0	Ø '	a	b	R2
P. butleri	native	South Pacific, Mexico	1	1868	1.5–6.1	-	-	-	-	-	-	0.023	3.27	0.968
P. butleri	native	Gulf of California, Mexico	2	44	1.75–5.54	0.18–5.54	-	-	-	-	-	0.0026	3.13	0.99
P. gillii	native	Chocó region, Ecuador	3	601	1.36–5.21	0.06–4.52	-	-	-	-	-	0.0233	3.16	0.969
P. mexicana	native	Jalpan River, Mexico	4	762	0.8–5.0	1.7–3.6	1.00:1.00	-	-	-	-	0.22	7.41	0.84
P. mexicana	native	Grijalva River Basin, Mexico	5	158	3.3–7.1	-	-	-	-	-	-	0.0038	2.782	0.941
P. reticulata	native	Santa Marta, Colombia	6	231	-	-	0.69:1.00	39.8	0.21	−0.91	2.52	0.008	3.045	-
P. reticulata	native	Bodoquena Plateau, Brazil	7	49	1.50–3.29	0.083–1.03						0.0219	3.09	0.965
P. reticulata	native	Mundaú River Basin, Brazil	8	204	1.0–2.6	0.01–0.17	-	-	-	-	-	0.009	2.982	0.807
P. reticulata	native	Humid forest enclaves, Brazil	9	840	0.63–4.13	0.004–1.85	-	-	-	-	-	0.0216	3.107	0.966
P. sphenops	native	South Pacific, Mexico	1	1604	1.8–7.1	-	-	-	-	-	-	0.034	3.00	0.978
P. sphenops	native	Grijalva River Basin, Mexico	5	58	3.0–7.5	-	-	-	-	-	-	0.0028	2.970	0.979
P. velifera	native	Yucatan, Mexico	10	89	1.4–5.2	0.10–6.40	-	-	-	-	-	0.022	3.302	0.972
P. velifera	alien	Songkhla, Thailand	11	6.033	0.7–6.9	-	1.00:1.80	73.58	0.82	0.99	-	0.000013 ♂0.000014 ♀	3.237 ♂3.194 ♀	0.986 ♂0.987 ♀
P. vivipara	native	Coastal Lagoons, Brazil	12	318	1.0–6.0	0.01–3.27	-	-	-	-	-	0.008	3.368	0.96
P. vivipara	native	Guaratiba Mangrove, Brazil	13	555	1.8–7.8	0.07–6.48	-	-	-	-	-	0.0078	3.28	0.97
P. vivipara	native	Atlantic coastal drainage, Brazil	14	24	2.06–4.07	0.11–0.95	-	-	-	-	-	0.00795	3.49	0.961
P. latipinna	native	Everglades, USA	15	1671	0.6–5.4	-	0.31:1.00	-	-	-	-	0.0267	2.880	0.930
P. latipinna	native	Gulf of Mexico, USA	16	14	2.6–.5.0	-	-	-	-	-	-	0.6674	2.90	0.94
P. latipinna	alien	Indonesia	17	1062	2.6–7.6	-	0.53:1.00	-	-	-	-	0.00003	3.02	0.85
P. latipinna	alien	Wadi Al-Bahayes, Oman	This study	124	3.7–7.5	0.77–4.81	0.59:1.00	11.46 ♂14.51 ♀	−0.127 ♂−0.072 ♀	−2.71♂−3.98♀	1.22 ♂1.18 ♀	0.0272 ♂0.0151 ♀0.0214 ♂+♀	2.5907 ♂3.0398 ♀2.7889 ♂ + ♀	0.9579 ♂0.9368 ♀0.9212 ♂ + ♀

Size and age composition for females (F) and males (M) of P_ latipinna

Age class	I		II		III		IV		Total
Total length (cm)	♀	♂	♀	♂	♀	♂	♀	♂
3.70–4.20	9	8							17
4.21–4.70	26	11							37
4.71–5.20	2	5	21	5					33
5.21–5.70			7	7	1				15
5.71–6.20					10	4	1	1	16
6.21–6.70							1	3	4
6.71–7.20								1	1
7.21–7.70								1	1
∑	37	24	28	12	11	4	2	6	124
TL ± sd (min.–max)
♀	4.44 ± 0,04 (3.70–4.78)		5.13 ± 0.03 (4.83–5.56)		5.81 ± 0.02 (5.61–5.99)		6.41 ± 0.17 (6.16–6.66)		4.93 ± 0.06 (3.70–6.66)
♂	4.34 ± 0.07 (3.70–4.79)		5.20 ± 0.04 (4.99–5.45)		5.93 ± 0.02 (5.85–5.99)		6.61 ± 0.19 (6.15–7.50)		5.00 ± 0.12 (3.70–7.50)

Age and sex distribution for females (F), males (M) and all P_ latipinna specimens from Oman (N – Number of samples, N% – Percent of samples)

Age	Females		Males		All		M:F
	N	%N	N	%N	N	%N
1	37	29.84	24	19.35	61	49.19	0.65:1.00 (p < 0.05)
2	28	22.58	12	9.68	40	32.26	0.43:1.00 (p < 0.05)
3	11	8.87	4	3.23	15	12.10	0.36:1.00 (p < 0.05)
4	2	1.61	6	4.84	8	6.45	3.00:1.00 (p < 0.05)
∑	78	62.90	46	37.10	124	100	0.59:1.00 (p < 0.05)