Relative growth and morphometry of sagittae otoliths of weakfishes, <i>Cynoscion guatucupa</i> (Cuvier, 1830) and <i>Cynoscion jamaicensis</i> (Vaillant &amp; Bocourt, 1883), in the Southwestern Atlantic Ocean, Brazil

Mendonça, Pablo; Domingues, João Pedro de Mello; Bauer, Arthur de Barros; Fischer, Luciano Gomes; Costa, Marcus Rodrigues da

doi:10.1590/2675-2824070.22035pm

Pablo Mendonça ^** Corresponding author: pablomendonca@id.uff.br

Conceptualization

Data curation

Investigation

Formal Analysis

Writing - original draft

Writing - review & editing

Universidade Federal Fluminense. Instituto de Biologia - Programa de Pós-Graduação em Biologia Marinha e Ambientes Costeiros (Rua Prof. Marcos Waldemar de Freitas Reis, s/n - Campus do Gragoatá, Bloco M - São Domingos - Niterói - 24210-201 - RJ - Brazil)

Universidade Federal Fluminense. - Instituto de Biologia - Laboratório de Biologia do Nécton e Ecologia Pesqueira. Niterói, RJ, Brasil (Rua Prof. Marcos Waldemar de Freitas Reis, s/n - Campus do Gragoatá, Bloco M - São Domingos - Niterói - 24210-201 - RJ - Brazil)

http://orcid.org/0000-0001-5001-138X

João Pedro de Mello Domingues

Methodology

Investigation

Formal Analysis

Writing - original draft

Universidade Federal Fluminense. - Instituto de Biologia - Laboratório de Biologia do Nécton e Ecologia Pesqueira. Niterói, RJ, Brasil (Rua Prof. Marcos Waldemar de Freitas Reis, s/n - Campus do Gragoatá, Bloco M - São Domingos - Niterói - 24210-201 - RJ - Brazil)

http://orcid.org/0000-0001-9572-1035

Arthur de Barros Bauer

Methodology

Data curation

Investigation

Visualization

Writing - review & editing

Universidade Federal do Rio de Janeiro - Instituto de Biodiversidade e Sustentabilidade (NUPEM/UFRJ). Av São José Barreto, 764 - São José do Barreto - Macaé - 27965-045 - RJ - Brasil)

http://orcid.org/0000-0002-3848-1458

Luciano Gomes Fischer

Supervision

Funding Acquisition

Resources

Methodology

Visualization

Writing - review & editing

Universidade Federal do Rio de Janeiro - Instituto de Biodiversidade e Sustentabilidade (NUPEM/UFRJ). Av São José Barreto, 764 - São José do Barreto - Macaé - 27965-045 - RJ - Brasil)

http://orcid.org/0000-0002-7219-4364

Marcus Rodrigues da Costa

Supervision

Project Administration

Resources

Visualization

Validation

Writing - review & editing

Universidade Federal Fluminense. Instituto de Biologia - Programa de Pós-Graduação em Biologia Marinha e Ambientes Costeiros (Rua Prof. Marcos Waldemar de Freitas Reis, s/n - Campus do Gragoatá, Bloco M - São Domingos - Niterói - 24210-201 - RJ - Brazil)

Universidade Federal Fluminense. - Instituto de Biologia - Laboratório de Biologia do Nécton e Ecologia Pesqueira. Niterói, RJ, Brasil (Rua Prof. Marcos Waldemar de Freitas Reis, s/n - Campus do Gragoatá, Bloco M - São Domingos - Niterói - 24210-201 - RJ - Brazil)

http://orcid.org/0000-0002-0737-1184

* Corresponding author: pablomendonca@id.uff.br

Associate Editor: Francesc Maynou

Figures (5)
Tables (2)

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Figure 1
The northern coast of Rio de Janeiro (southeastern Brazilian coast) shows Macaé, 22°S -41°W (fishery landing site) and the main small-scale fishery area (in gray bordered by the dashed line). The continuous line represents the isobaths: 10, 20, 50, and 100 meters deep.

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Figure 2
Left sagittae otoliths of Weakfishes, with indicated measurements, (a) Cynoscion guatucupa: LT =235 mm, WT =170.4g; (b) Cynoscion jamaicensis: LT = 234 mm, WT = 126.5g). OL, Otolith length; OH: Otolith height. Sense of direction: D = dorsal; V = ventral; P = posterior; and A= anterior.

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Figure 3
Absolute and cumulatuve frequency by length class (mm) of Cynoscion guatucupa (a), C. jamaicensis (b).

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Figure 4
LWRs and regressions lines for pooled sexes of Cynoscion guatucupa, x (n = 740) and Cynoscion jamaicensis, o (n = 752) obtained from gillnet and bottom trawl small-scale fisheries in the Southwestern Atlantic Ocean (Brazil). Continuous gray line indicates the regression line for C. guatucupa. Dotted black line indicates regression for C. jamaicenses.

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Figure 5
Relationships between fish sizes and sagittae otolith measurements of Cynoscion guatucupa (x) and Cynoscion jamaicensis (o) obtained from gillnet and bottom trawl small-scale fisheries in the Southwestern Atlantic Ocean (Brazil).

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Table 1
Morphometric measurements (mean ± S.E) of Cynoscion guatucupa (n = 740) and Cynoscion jamaicensis (n = 752). H: Kruskal-Wallis. p-value is regarded as being significant if < 0.05. LT = Total length; LS = Standard length; WT = Total weight; O_L = Otolith length; O_H = Otolith height; O_T = Otolith thickness; O_W = Otolith weight; O_AR = Otolith aspect ratio.

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Table 2
Relationships (x - y) between fish sizes and sagittae otolith measurements of Cynoscion guatucupa and Cynoscion jamaicensis obtained from gillnet and bottom trawl small-scale fisheries in the southwestern Atlantic (Brazil). Number of specimens (n) and coefficients of determination (r²) and parameters of power equations.; ‘a>’ and ‘b>’: regression parameters; CI: 95% confidence interval; OL: otolith length; OH: otolith height; OT: otolith thickness; OWT: otolith weight; LT: total length; Ls = standard length; W T: total weight. F-Test to compare regressions between especiesspecies. The p-value is regarded as being significant if < 0.05.

Morphometric variables	C. guatucupa	C. jamaicensis	H	d.f.	p-value
LT (mm)	285 ± 0.15	234.5 ± 0.17	316.8	1	< 0.001
LS (mm)	240 ± 0.13	198.1 ± 0.15	288.6	1	< 0.001
WT (g)	268.2 ± 4.2	188.8 ± 4.07	147.4	1	< 0.001
OL (mm)	12.48 ± 1.3	11.5 ± 2.2	66.5	1	< 0.001
OH (mm)	6.5 ± 0.5	5.7 ± 0.7	419.7	1	< 0.001
OT (mm)	2.4 ± 0.4	2.4 ± 0.4	654.7	1	< 0.001
OWT (g)	0.22 ± 0.06	0.16 ± 0.08	303.6	1	< 0.001
OAR	1.9 ± 0.003	2.02 ± 0.006	301.4	1	< 0.001

Relationships	Cynoscion guatucupa						Cynoscion jamaicensis						Comparisons
Relationships	n	a	b	r²	± CI (a)	± CI (b)	n	a	b	r²	± CI (a)	± CI (b)	F	p-value
O_L vs L_T	710	1.02	1.30	0.93	0.028	0.025	703	1.21	1.08	0.96	0.016	0.015	193.12	>0.001
O_L vs L_S	709	0.91	1.33	0.92	0.030	0.027	704	1.10	1.11	0.96	0.017	0.016	168.72	<0.001
O_L vs W_T	713	-1.79	3.82	0.91	0.090	0.082	694	-1.51	3.50	0.93	0.055	0.052	39.56	<0.001
O_L vs O_WT	718	-3.45	2.54	0.94	0.043	0.040	705	-3.59	2.59	0.96	0.032	0.030	3.08	0.079
O_L vs O_H	710	0.14	0.60	0.81	0.023	0.021	704	0.02	0.68	0.94	0.0001	0.013	35.35	<0.001
O_L vs O_T	708	-0.56	0.96	0.77	0.043	0.039	698	-0.57	0.90	0.83	0.031	0.029	7.67	0.005
O_H vs O_WT	718	-3.51	3.49	0.83	0.087	0.107	699	-3.55	3.59	0.92	0.048	0.063	2.24	0.134
O_T vs O_WT	719	-1.73	2.13	0.84	0.033	0.066	693	-1.79	2.54	0.90	0.027	0.070	63.19	<0.001
O_H vs O_T	714	-0.53	1.25	0.63	0.056	0.069	689	-0.57	1.26	0.81	0.034	0.045	0.0005	0.981
O_WT vs W_T	714	3.37	1.46	0.90	0.023	0.033	699	3.29	1.31	0.86	0.021	0.025	45.18	<0.001

[1] * Corresponding author: pablomendonca@id.uff.br

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Relative growth and morphometry of sagittae otoliths of weakfishes, Cynoscion guatucupa (Cuvier, 1830) and Cynoscion jamaicensis (Vaillant & Bocourt, 1883), in the Southwestern Atlantic Ocean, Brazil

Abstract