Resumo
The factors involved in the induction of resting eggs development and hatching are poorly understood for Brachionus calyciflorus populations of South Hemisphere. The role of some abiotic factors in controlling the hatching rates of B. calyciflorus resting eggs was investigated. Determination of optimum hatching conditions would be important in developing the use of this species as food for fish larvae in aquaculture. Resting eggs were exposed to different treatments in the laboratory, and monitored for hatching over a period of five days. Optimum hatching conditions were: pH 5-9, water ionic concentrations from 220 to 880 mg.l-1 of selected salts, temperature 25 - 30ºC, photoperiod eight or more hours light per day, and light intensity equal to or greater than 850 lux.
Brachionus calyciflorus; rotifer; resting eggs; hatching eggs; abiotic factors
Brachionus calyciflorus; rotifer; resting eggs; hatching eggs; abiotic factors
Influência de fatores abióticos na eclosão de ovos dormentes do rotífero Brachionus calyciflorus Pallas (Monogononta, Ploima)
The effect of abiotic factors on the hatching of Brachionus calyciflorus Pallas (Monogononta, Ploima) resting eggs
Nilton Eduardo Torres RojasI,III; José Roberto VeraniII; Maria Amália Basile-MartinsI
IInstituto de Pesca. Avenida Francisco Matarazzo 455, 05001-900 São Paulo, São Paulo, Brasil
IIDepartamento de Hidrobiologia, Universidade Federal de São Carlos. Estrada Washington Luís, Km 235, 13565-905 São Carlos, São Paulo, Brasil
IIIBolsista da CAPES
ABSTRACT
The factors involved in the induction of resting eggs development and hatching are poorly understood for Brachionus calyciflorus populations of South Hemisphere. The role of some abiotic factors in controlling the hatching rates of B. calyciflorus resting eggs was investigated. Determination of optimum hatching conditions would be important in developing the use of this species as food for fish larvae in aquaculture. Resting eggs were exposed to different treatments in the laboratory, and monitored for hatching over a period of five days. Optimum hatching conditions were: pH 5-9, water ionic concentrations from 220 to 880 mg.l-1 of selected salts, temperature 25 - 30ºC, photoperiod eight or more hours light per day, and light intensity equal to or greater than 850 lux.
Key words:Brachionus calyciflorus, rotifer, resting eggs, hatching eggs, abiotic factors.
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AGRADECIMENTO. A Coordenadoria de Capacitação e Aperfeiçoamento de Pessoal do Ensino Superior (CAPES), pela concessão de bolsa de pós-graduação, a nível de mestrado.
Recebido em 16.VII.1998; aceito em 16.XI.1999.
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Datas de Publicação
-
Publicação nesta coleção
04 Jun 2009 -
Data do Fascículo
1999
Histórico
-
Aceito
16 Nov 1999 -
Recebido
16 Jul 1998
