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Revista Brasileira de Zoologia

Print version ISSN 0101-8175

Rev. Bras. Zool. vol.17 no.3 Curitiba Sept. 2000 

Ablação ocular no camarão Macrobrachium rosenbergii (De Man) (Crustacea, Decapoda, Palaemonidae): efeitos sobre a reprodução, pigmentação epidérmica e atividade alimentar


Eyestalk ablation in the prawn Macrobrachium rosenbergii (De Man) (Crustacea, Decapoda, Palaemonidae): effects on reproduction, epidermic pigmentation and feeding activity



Marcel José Martins dos SantosI; Marcelo Antônio Amaro PinheiroII

ILaboratório de Biologia de Crustáceos, Centro de Aquicultura, Universidade Estadual Paulista
IIDepartamento de Biologia Aplicada, Universidade Estadual Paulista, Núcleo de Estudos em Biologia, Ecologia e Cultivo de Crustáceos. Via de acesso Professor Paulo Donato Castellane, 14884-900 Jaboticabal, São Paulo, Brasil




This study analyze the consequences of unilateral and bilateral ablation based on ovigerous percentage, consecutive spawns, and secondary effects of the surgical process in the females of Macrobrachium rosenbergii (De Man, 1879). Two experiments were carried out with four and seven months old females in intermolt stage. Each experiment was comprised of control, unilateral and bilateral ablation. Eyestalk ablation was done with a bistoury with a topic hot cauterization followed by application of antibiotic pomades. The animals were maintained at constant temperature (28 ± 1,05ºC) and photoperiod of 12L: 12D within fibercement boxes with sandy bottom and biological filter. Females were observed once a day during fourteen weeks, registering gonadal condition, ecdysis and presence of spermatophore (mating) and spawning. Unilateral ablation technique is more efficient due to the anticipation of the first spawn, repeatability between spawns, expressive rate of ovigerous females and survival, that favored its applicability. Bilateral eyestalk ablation produced the mortality of ali the females with change in coloration and food activity patterns. These results corroborate other observations on penaeid shrimps. though bilateral ablation on some lobsters was a success. These results showing an interespecific variation and can be used in aquaculture projects.

Key words: Crustacea, eyestalk ablation, reproduction, pigmentation, feeding activity, prawn



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AGRADECIMENTOS. Aos técnicos do Setor de Carcinicultura do CAUNESP, Biól. José Roberto Polachini e Sr. Valdecir Lima, pelo precioso auxílio durante a fase experimental deste trabalho. À Profa. Dra. Maria Lucia Negreiros-Fransozo (Departamento de Zoologia, IB/UMESP) e Dr. Jellu Makoto Nakagaki (UEMS), pelas preciosas sugestões fornecidas por ocasião da defesa do trabalho de graduação que resultou no presente artigo.



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Recebido em 26.VIII.1999; aceito em 22.VIII.2000.

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