Evaluation of different induced molting methods in <i>Callinectes ornatus</i> (Crustacea, Decapoda, Portunidae) as a tool for the commercial production of soft-shell crabs

TAVARES, CAMILA P.S.; SILVA, UBIRATÃ A.T. DA; PEREIRA, LEANDRO ÂNGELO; OSTRENSKY, ANTONIO

doi:10.1590/0001-3765202120190580

CAMILA P.S. TAVARES

Programa de Pós-Graduação em Zoologia, Universidade Federal do Paraná, Departamento de Zoologia, Av. Cel. Francisco H. Santos, s/n, Jardim das Américas, 80035-050 Curitiba, PR, Brazil

https://orcid.org/0000-0002-0475-1835

UBIRATÃ A.T. DA SILVA

Grupo Integrado de Aquicultura e Estudos Ambientais, Universidade Federal do Paraná, Departamento de Zootecnia, Rua dos Funcionários, 1540, Cabral, 82590-300 Curitiba, PR, Brazil

https://orcid.org/0000-0003-0476-5716

LEANDRO ÂNGELO PEREIRA

Instituto Federal do Paraná, Campus Paranaguá, Av. Antônio Carlos Rodrigues, 453, Porto Seguro, 83215-750 Paranaguá, PR, Brazil

https://orcid.org/0000-0001-6055-8063

ANTONIO OSTRENSKY

Grupo Integrado de Aquicultura e Estudos Ambientais, Universidade Federal do Paraná, Departamento de Zootecnia, Rua dos Funcionários, 1540, Cabral, 82590-300 Curitiba, PR, Brazil

https://orcid.org/0000-0001-8858-7552

Correspondence to: Camila P.S. Tavares E-mail: camilapstavares@gmail.com

AUTHOR CONTRIBUTIONS

The study describes a 2-year study based on the master’s project of Camila Prestes dos Santos Tavares, who was the main contributor to the conception and design of the work, data collection, data analysis and interpretation and drafting the article. The study was conducted under the supervision of Dr Antonio Ostrensky, who participated in the planning of the work, data analysis and critical revision of the article. The co-authors include two specialists in crustacean aquaculture. Dr Leandro Ângelo Pereira is an expert in environmental management and aquaculture, who contributed to the acquisition and interpretation of data, drafting the article and revising it critically for important intellectual content. Dr Ubiratã de Assis Teixeira da Silva is an expert in brachyuran crabs aquaculture and fishery extension, who participated in interpretation of data, drafting the article and revising it critically for important intelectual content. All authors participated in the final approval of the version to be published.

Figures (4)
Tables (3)

Thumbnail

Figure 1
Cumulative premolt frequency in Callinectes ornatus subjected to different experimental treatments for 30 days. Different lowercase letters in rows indicate significant differences (p<0.001) among the experimental groups, calculated using the McNemar test.

Thumbnail

Figure 2
Survival curve of Callinectes ornatus specimens subjected to different experimental treatments for 30 days: C—Control group; CA—Cheliped autotomy; UA—Unilateral ablation; and BA—Bilateral ablation.

Thumbnail

Figure 3
Relation between death and the premolt (a) and the duration of the premolt stage (b), the 95% confidence interval for Callinectes ornatus subjected to different experimental treatments for 30 days.

Thumbnail

Figure 4
Presence of morphological signs of molt stages in Callinectes ornatus: white line along the distal edges of the pleopod (a); reddish color indicating the proximity of molt (b).

Thumbnail

Table I
Mean ± standard deviation of water quality variables of the experimental system and recommendations of optimal conditions for farming of swimming crabs by Malone & Burden (1988)MALONE RF & BURDEN DG. 1988. Design of recirculating soft crawfish sheddind systems. Lousiana Sea Grant College Program, Baton Rouge, LA, USA: Louisiana Sea Grant College Program, Center for Wetland Resources, Louisiana State University, 80 p. and Hochheimer (1988)HOCHHEIMER J. 1988. Water Quality in Soft Crab Shedding. Crab Shedders Workbook Series, College Park, MD, USA.: University of Maryland, Sea Grant Extension Program, 6 p..

Thumbnail

Table II
Premolt and molt frequencies in Callinectes ornatus of different size classes subjected to different experimental treatments.

Thumbnail

Table III
Time (days) until the premolt stage and, subsequently, until molting in Callinectes ornatus specimens subjected to different experimental treatments.

Physicochemical variables	Mean ± standard deviation	Values recommended by Malone & Burden (1988)MALONE RF & BURDEN DG. 1988. Design of recirculating soft crawfish sheddind systems. Lousiana Sea Grant College Program, Baton Rouge, LA, USA: Louisiana Sea Grant College Program, Center for Wetland Resources, Louisiana State University, 80 p. and Hochheimer (1988)HOCHHEIMER J. 1988. Water Quality in Soft Crab Shedding. Crab Shedders Workbook Series, College Park, MD, USA.: University of Maryland, Sea Grant Extension Program, 6 p.
Temperature (°C)	26,2 ± 2,0	22 - 28
Dissolved oxygen (mg/L)	4,86 ± 0,5	>7,0
Dissolved oxygen (%)	72,8 ± 7,4	Nd*
pH	7,99 ± 0,1	6,5 - 8,5
Salinity	35,3 ± 0,9	5 ppm above/below of harvesting water
Total Ammonia (mg/L)	0,07 ± 0,02	<1,0
Nitrite (mg/L)	0,07 ± 0,05	<0,5
Alkalinity (mg/L)	46,58 ± 9,90	>100,0

		PREMOLT		MOLT
GROUPS	Size class	N° of observations	%	N° of observations	%
Control	1	0^a	0	0^a	0
Control	2	0^a	0	0^a	0
Cheliped autotomy	1	10^c	26	10^c	26
Cheliped autotomy	2	2^b	5	2^b	5
Unilateral ablation	1	1^e	3	1^e	3
Unilateral ablation	2	2^d	6	0^d	0
Bilateral ablation	1	16^fc	52	16^fc	52
Bilateral ablation	2	5^f	14	0^f	0

GROUPS	Size class	PREMOLT	MOLT
GROUPS	Size class	Mean ± standard deviation	Mean ± standard deviation
Cheliped autotomy	1	16,2 ± 1,3^a	6,7 ± 0,9^a
Cheliped autotomy	2	17,0 ± 2,2^a	8,5 ± 0,7
Unilateral ablation	1	18,0 ± 4,31^a	9,0 ± 2,8^a
Unilateral ablation	2	23,0 ± 2,2^a	-
Bilateral ablation	1	10,8 ± 1,0^b	6,2 ± 0,7^a
Bilateral ablation	2	19,6 ± 1,4^a	-
Control	1	30 ± 0,0*	-
Control	2	30 ± 0,0*	-

[1] Correspondence to: Camila P.S. Tavares E-mail: camilapstavares@gmail.com

Brasil

Brasil

Evaluation of different induced molting methods in Callinectes ornatus (Crustacea, Decapoda, Portunidae) as a tool for the commercial production of soft-shell crabs

Abstract