Age and growth of two populations of <i>Pugilina cochlidium</i> (Gastropoda: Melongenidae), from Thondi coast-Palk Bay in Tamil Nadu-South East coast of India

De los Ríos, Patricio; Kanagu, Laksmanan; Lathasumathi, Chokkalingam; Stella, Chelladurai

doi:10.1590/1519-6984.203544

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Brazilian Journal of Biology

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Original Article • Braz. J. Biol. 80 (1) • Jan-Feb 2020 • https://doi.org/10.1590/1519-6984.203544 copy

Age and growth of two populations of Pugilina cochlidium (Gastropoda: Melongenidae), from Thondi coast-Palk Bay in Tamil Nadu-South East coast of India

Idade e crescimento de duas populações de Pugilina cochlidium (Gastropoda: Melongenidae), de Thondi coast-Palk Bay na costa Tamil Nadu-Sudeste da Índia

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

Age and growth of two populations of Pugilina cochlidium were studied. to address the lack of basic information on the growth rates and the size at sexual maturity of organism in a commercially harvested area, which will be important in considering the size limits to conserve this resources in future. In the present study the results showed more or less similar growth patterns in the males and females of two populations of Pugilina cochlidium. The age and growth estimation of these two populations of Pugilina cochlidium were completed using several methods and the outcome of one method will act as a check and control over the other using the FISAT 1 software. The values of asymptotic length (L_α) values obtained in the present study using various methods did not vary greatly. L_α values obtained for the first population of Pugilina cochlidium was 95.55 mm for males and 106.05 mm for females and the growth rate (K) for males (0.588 yr^-1) and females (0.620 yr^-1) was given by k-scan routine in ELEFAN. Similarly, the values of asymptotic length (L_α), obtained for second population of Pugilina cochlidium, was 96.15 mm for males and 106.05 mm for females and the growth rate (K) for males (0.540 yr^-1) and females (0.950 yr^-1) was given by k-scan routine in ELEFAN.

Keywords:
gastropods; Melongenidae; age; growth; Pugilina cochlidium

Method	Sex	L∞ (mm)	Z/K	K(yr^-1)	t_o (yr)	Rn/Score
Powell wetherall	M	98.71	3.13	-	-	-
Powell wetherall	F	114.29	3.87	-	-	-
ELEFAN i. Automatic scan	M	95.55	-	1.0	-	0.16
ELEFAN i. Automatic scan	F	106.05	-	1.0	-	0.16
ELEFAN ii. K-scan	M	95.55	-	0.588	-	0.18
ELEFAN ii. K-scan	F	106.05		0.620		0.18

Method	Sex	L∞ (mm)	Z/K	K(yr^-1)	t_o (yr)	Rn/Score
Powell wetherall	M	92.74	2.38	-	-	-
Powell wetherall	F	113.75	3.56	-	-	-
ELEFAN i. Automatic scan	M	96.15	-	1.00		0.18
ELEFAN i. Automatic scan	F	106.5	-	1.00		0.26
ELEFAN ii. K-scan	M	95.55	-	0.54	-	0.22
ELEFAN ii. K-scan	F	106.05	-	0.95	-	0.23

t (yr)	t-to	k(t-to)	e^-K(t-to)	1-e^-K(t-to)	$L t = L_{α} [1 - e^{- K (t - t o)}]$
1	1.83	1.06	0.34	0.65	62.49
2	2.83	1.64	0.19	0.80	77.04
3	3.83	2.22	0.10	0.89	85.19
4	4.83	2.80	0.06	0.93	89.75
5	5.83	3.38	0.03	0.96	92.31

t (yr)	t-to	k(t-to)	e^-K(t-to)	1-e^-K(t-to)	$L t = L_{α} [1 - e^{- K (t - t o)}]$
1	1.62	1.00	0.36	0.63	67.21
2	2.62	1.62	0.19	0.80	85.15
3	3.63	2.24	0.10	0.89	94.81

Age	Length (Lt)	Lt/L∞	1-Lt/ L∞	-Ln(1-Lt/ L∞)
1	28	0.29	0.70	0.34
2	57	0.59	0.40	0.90
3	74	0.77	0.22	1.48
4	82	0.85	0.14	1.95
5	90	0.94	0.05	2.84

Age	Length (Lt)	Lt/L∞	1-Lt/ L∞	-Ln(1-Lt/ L∞)
1	46	0.433	0.56	0.56
2	82	0.77	0.22	1.48
3	103	0.97	0.02	3.54

t (yr)	t-to	k(t-to)	e^-K(t-to)	1-e^-K(t-to)	$L t = L_{α} [1 - e^{- K (t - t o)}]$
1	1.64	0.88	0.41	0.58	56.26
2	2.64	1.42	0.36	0.63	60.24
3	3.64	1.96	0.21	0.78	74.56
4	4.64	2.50	0.08	0.91	87.78
5	5.64	3.04	0.47	0.95	91.02
6	6.64	3.58	0.02	0.97	92.91

t (yr)	t-to	k(t-to)	e^-K(t-to)	1-e^-K(t-to)	$L t = L_{α} [1 - e^{- K (t - t o)}]$
1	1.83	1.22	0.29	0.70	74.95
2	2.83	1.89	0.15	0.85	90.14
3	3.83	2.56	0.07	0.92	97.91
4	4.83	3.23	0.03	0.96	101.89

Age	Length (Lt)	Lt/L∞	1-Lt/ L∞	-Ln(1-Lt/ L∞)
1	25	0.26	0.73	0.30
2	42	0.43	0.56	0.57
3	64	0.66	0.33	1.10
4	78	0.81	0.18	1.69
5	86	0.90	0.09	2.30
6	92	0.96	0.03	3.29

Age	Length (Lt)	Lt/L∞	1-Lt/ L∞	-Ln(1-Lt/ L∞)
1	45	0.42	0.57	0.55
2	78	0.73	0.26	1.32
3	90	0.84	0.15	1.88
4	103	0.97	0.02	3.54

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