Age and growth of <i><i>Zapteryx brevirostris</i></i> (Elasmobranchii: Rhinobatidae) in southern Brazil

Carmo, Wanessa P. D.; Fávaro, Luís Fernando; Coelho, Rui

doi:10.1590/1982-0224-20170005

Acessibilidade / Reportar erro

Brasil

Español English

sumário « anterior atual seguinte »

Sumário

Original article • Neotrop. ichthyol. 16 (1) • 2018 • https://doi.org/10.1590/1982-0224-20170005 copy

Age and growth of Zapteryx brevirostris (Elasmobranchii: Rhinobatidae) in southern Brazil

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Age and growth studies are fundamental to successful fisheries management. Zapteryx brevirostris (Müller & Henle, 1841) is distributed off the Brazilian continental shelf and this species is assessed as “Vulnerable” in the Red List of the International Union for the Conservation of Nature (IUCN). Thus, the objective of this study was to present previously unknown information about the age and growth of Z. brevirostris that can be used for its management, conservation, and fisheries. A total of 162 specimens were sampled, with total lengths (TL) varying between 35.7 cm and 56 cm. The vertebrae were embedded in resin, sectioned in cuts with 0.5 mm thickness and the growth bands of the vertebrae were read under a light microscope. In the studied area, Z. brevirostris ages were estimated from 4 to 10 years according to vertebrae patterns. The species reaches its maximum asymptotic size (Linf) around 56 cm (56 cm for females and 50.37 cm for males). This is the first estimate of age and growth for a species of the Zapteryx genus, and the results support the hypothesis that this ray requires future management conservation, particularly due to its slow growth rate and consequent susceptibility to overexploitation.

Keywords:
Back-calculation; Conservation; Growth rate; k value; Von Bertalanffy curves (VBGF)

Age	Grouped		Females		Males		Mean TL according to each technique (grouped sexes)
Age	x ²	P value	x ²	P value	x ²	P value	BPH	Dahl Lea	Fraser Lee	SPH
0	555.91	P ≤ 0.05	240.2	P ≤ 0.05	317.35	P ≤ 0.05	19.98	7.14	18.93	13.99
1	529.85	P ≤ 0.05	220.78	P ≤ 0.05	309.53	P ≤ 0.05	23.45	12.39	22.55	18.29
2	420.62	P ≤ 0.05	168.87	P ≤ 0.05	252.79	P ≤ 0.05	26.86	17.53	26.11	22.51
3	264.43	P ≤ 0.05	110.98	P ≤ 0.05	159.56	P ≤ 0.05	30.40	22.89	29.81	26.91
4	143.96	P ≤ 0.05	70.71	P ≤ 0.05	80.07	P ≤ 0.05	33.90	28.18	33.47	31.25
5	69.25	P ≤ 0.05	43.3	P ≤ 0.05	31.95	P ≤ 0.05	36.87	32.67	36.57	34.94
6	41.81	P ≤ 0.05	27.61	P ≤ 0.05	18.01	P ≤ 0.05	38.90	35.67	38.69	37.42
7	23.2	P ≤ 0.05	14.48	P ≤ 0.05	9.28	P ≤ 0.05	40.53	38.04	40.39	39.41
8	11.39	P ≤ 0.05	6.85	0.07684	5.23	0.1558	41.92	40.06	41.83	41.08
9	5.41	0.1439	4.39	0.2221	1.82	0.6111	42.85	41.50	42.79	42.25
10	0.97	0.8095	1.3	0.7288	3	0.3916	44.12	43.31	44.09	43.76

DATA		AIC	Parameter	Estimated value	SE	CI
DATA		AIC	Parameter	Estimated value	SE	higher	lower
GROUPED	Observed Values	802	Linf	47.9	16.0	16.2	79.6
			k	0.16	0.87	-1.23	1.44
			Lo	-20.71	117.55	-252.88	211.46
	Estimated Values	801.10	Linf	45.7	0.4	45.1	46.4
	Lo Fixed	801.10	k	0.74	0.14	0.46	1.01
	BPH	6565.38	Linf	56.0	2.0	52.1	59.8
			k	0.12	0.01	0.1	0.14
			Lo	-3.48	0.18	-3.83	-3.14
	BPH	7100.39	Linf	45.0	0.6	43.9	46.1
	Lo Fixed	7100.39	k	0.27	0.01	0.25	0.29
	Dahl Lea	6785.06	Linf	58.1	2.1	54.0	62.2
			k	0.12	0.01	0.11	0.14
			Lo	-2.11	0.1	-2.3	-1.91
	Dahl Lea	6790.11	Linf	61.0	2.2	56.7	65.4
	Lo Fixed	6790.11	k	0.11	0.01	0.1	0.13
	Fraser Lee	6433.59	Linf	56.4	1.9	52.8	60.1
			k	0.12	0.01	0.1	0.14
			Lo	-3.21	0.15	-3.5	-2.92
	Fraser Lee	6843.78	Linf	46.4	0.6	45.2	47.7
	Lo Fixed	6843.78	k	0.24	0.01	0.22	0.25
	SPH	7241.59	Linf	60.4	2.4	55.6	65.2
			k	0.13	0.01	0.11	0.14
			Lo	-0.89	0.06	-1.01	-0.77
	SPH	7274.53	Linf	69.1	3.5	62.3	75.9
	Lo Fixed	7274.53	k	0.1	0.01	0.08	0.11
FEMALES	Observed Values	3217.01	Linf	46.8	2.6	41.6	52.1
			k	0.32	1.07	-1.8	2.45
			to	-6.09	30.71	-67.38	55.19
	Observed Values	3218.79	Linf	46.4	0.5	45.5	47.3
	Lo Fixed	3218.79	k	0.75	0.21	0.33	1.16
	BPH	3129.99	Linf	59.3	3.6	52.3	66.3
			k	0.11	0.01	0.08	0.14
			Lo	-3.61	0.28	-4.16	-3.06
	BPH	3322.25	Linf	46.7	0.9	44.8	48.6
	Lo Fixed	3322.25	k	0.23	0.01	0.21	0.26
	Dahl Lea	3217.01	Linf	61.8	3.8	54.4	69.2
			k	0.11	0.01	0.08	0.13
			Lo	-2.24	0.17	-2.57	-1.92
	Dahl Lea	3218.79	Linf	66.0	4.2	57.8	74.3
	Lo Fixed	3218.79	k	0.09	0.01	0.07	0.11
	Fraser Lee	3053.03	Linf	59.5	3.3	53.0	66.0
			k	0.11	0.01	0.08	0.13
			Lo	-3.42	0.24	-3.9	-2.95
	Fraser Lee	3223.19	Linf	47.7	1.0	45.8	49.6
	Lo Fixed	3223.19	k	0.21	0.01	0.19	0.24
	SPH	3420.44	Linf	64.9	4.4	56.2	73.7
			k	0.11	0.01	0.08	0.13
			Lo	-0.94	0.1	-1.13	-0.74
	SPH	3435.56	Linf	77.8	7.0	64.0	91.5
	Lo Fixed	3435.56	k	0.08	0.01	0.06	0.1
MALES	Observed Values	3554.00	Linf	44.9	0.5	44.0	45.8
			k	1.36	4.51	-7.61	10.32
			to	0.97	10.60	-20.09	22.03
	Observed Values	3555.28	Linf	44.9	0.4	44.1	45.7
	Lo Fixed	3555.28	k	0.98	0.53	0.08	2.03
	BPH	3405.86	Linf	54.3	2.4	49.5	59.1
			k	0.13	0.01	0.11	0.16
			Lo	-3.41	0.23	-3.85	-2.96
	BPH	3766.53	Linf	43.8	0.7	42.4	45.3
	Lo Fixed	3766.53	k	0.3	0.02	0.27	0.33
	Dahl Lea	3554.00	Linf	56.8	2.7	51.4	62.1
			k	0.13	0.01	0.11	0.16
			Lo	-2.03	0.13	-2.28	-1.77
	Dahl Lea	3555.28	Linf	59.1	2.8	53.6	64.7
	Lo Fixed	3555.28	k	0.12	0.01	0.1	0.14
	Fraser Lee	3372.98	Linf	54.9	2.4	50.2	59.6
			k	0.13	0.01	0.11	0.16
			Lo	-3.07	0.19	-3.45	-2.7
	Fraser Lee	3616.96	Linf	45.5	0.8	43.8	47.1
	Lo Fixed	3616.96	k	0.26	0.01	0.23	0.28
	SPH	3799.58	Linf	59.3	3.2	53.0	65.6
			k	0.13	0.01	0.11	0.16
			Lo	-0.87	0.08	-1.02	-0.71
	SPH	3815.66	Linf	66.9	4.4	58.2	75.5
	Lo Fixed	k	0.11	0.01	0.08	0.13

Sociedade Brasileira de Ictiologia Neotropical Ichthyology, Núcleo de Pesquisas em Limnologia, Ictiologia e Aquicultura, Universidade Estadual de Maringá., Av. Colombo, 5790, 87020-900, Phone number: +55 44-3011-4632 - Maringá - PR - Brazil
E-mail: neoichth@nupelia.uem.br

Acompanhe os números deste periódico no seu leitor de RSS