| Autor: |
Tavares CPS; 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., Silva UATD; Grupo Integrado de Aquicultura e Estudos Ambientais, Universidade Federal do Paraná, Departamento de Zootecnia, Rua dos Funcionários, 1540, Cabral, 82590-300 Curitiba, PR, Brazil., Pereira LÂ; Instituto Federal do Paraná, Campus Paranaguá, Av. Antônio Carlos Rodrigues, 453, Porto Seguro, 83215-750 Paranaguá, PR, Brazil., Ostrensky A; Grupo Integrado de Aquicultura e Estudos Ambientais, Universidade Federal do Paraná, Departamento de Zootecnia, Rua dos Funcionários, 1540, Cabral, 82590-300 Curitiba, PR, Brazil. |
| Abstrakt: |
We investigated the effects of eyestalk ablation and cheliped autotomy in inducing molting in Callinectes ornatus. The specimens in intermolt stage were divided into two size classes: 1 (30-50 mm) and 2 (51-70 mm) and were further divided into four experimental groups. In the CA group (Cheliped Autotomy, n=76), crabs were submitted to cheliped autotomy; in the UA group (Unilateral Ablation, n=66) and BA group (Bilateral Ablation, n=66) to unilateral and bilateral eyestalk ablation, respectively. The C group (Control, n=70) was used as control. The animals were individually kept in tanks interconnected to a recirculation system for 30 days. The highest frequency of premolt was recorded in the BA group (32%), followed by the CA group (16%). The premolt frequency of class 1 (28%) was significantly higher (p<0.05) than of class 2 (8%). The mean time until molt in the BA group was significantly lower (p <0.05) than other groups tested. The highest mortality rates were 55% and 25% in crabs from the BA and CA groups, respectively. The results indicate bilateral eyestalk ablation and cheliped autotomy are potentially capable of inducing molt in C. ornatus, but these techniques have limited efficiency for the commercial application of large-scale soft-shell crab. |
