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Braz J Biol. 2019 Oct-Dec;79(4):669-677. doi: 10.1590/1519-6984.188607. Epub 2018 Oct 25.

Effect of photoperiod on ovarian maturation in Cheirodon interruptus (Teleostei: Characidae).

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Laboratorio de Ecología de Peces, Instituto de Limnología "Dr. Raúl A. Ringuelet" - ILPLA/ CONICET-UNLP, Boulevard 120 y 62, 1460, CP 1900, CC 712, La Plata, Buenos Aires, Argentina.
Laboratorio de Histología y Embriología Descriptiva, Experimental y Comparada, Facultad de Ciencias Veterinarias - UNLP, Av. 60 y 118, La Plata, Buenos Aires, Argentina.
Ministerio de Agroindustria, Subsecretaría de Pesca y Acuicultura de la Nación, Dirección de Pesca Continental, Paseo Colón 982, 1073, Buenos Aires, Argentina.
Laboratorio de Ictiofisiología y Acuicultura, Instituto de Investigaciones Biotecnológicas-Instituto Tecnológico de Chascomús "Dr. Raúl Alfonsín" - IIB-INTECH/ CONICET-UNSAM, Intendente Marino, Km 8.200 (B7130IWA), Chascomús, Buenos Aires, Argentina.


Cheirodon interruptus is a ubiquitous small characid that inhabits the Pampean region and commonly used as bait. Its vast market is supplied from the wild population causing a significant environmental impact. In this study, we assess the effect of photoperiod on ovarian maturation in order to evaluate its potential as a tool to manipulate reproduction under artificial conditions. Four treatments in triplicate (light: dark, L: D) were tested: 24L: 0D, 12L: 12D, 0L: 24D and a progressive photoperiod corresponding to the daily photoperiod increments in wild during winter-spring transition, accelerated three times. The experiment was conducted for 45 days. Gonadosomatic index (GSI), oocyte mean diameter, vitellogenic oocyte proportions, plasma estradiol concentrations (E2), condition factor (Kn) and standard length were estimated. Values of mean GSI, oocyte diameter, vitellogenic oocyte proportions and E2 concentration were maximum in the progressive treatment indicating vitellogenesis stimulation. In turn the same parameters were minimum in the 24L: 0D, revealing the vitellogenesis inhibition. This study showed that photoperiodic regime play an important role in the onset of ovarian maturation in C. interruptus.

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