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

• Published in: Brazilian journal of biology Vol. 79; no. 4; pp. 669 - 677
• Main Authors: García, I D, Plaul, S E, Torres, D, Del Fresno, P S, Miranda, L A, Colautti, D C
• Format: Journal Article
• Language: English; Portuguese
• Published: Brazil Association of the Brazilian Journal of Biology 01.11.2019; Instituto Internacional de Ecologia
• Subjects: 17β-Estradiol; Animals; Aquaculture; Baits; Biochemistry; BIOLOGY; Carabodes interruptus; Characidae - physiology; Characiformes; Cheirodon interruptus; Circadian Rhythm; Cod; Condition factor; Environmental impact; Estradiol - blood; Female; Fish; fotoperíodo; Light; Maturation; maturação gonadal; Oocytes - growth & development; Photoperiod; Physiology; Reproduction - physiology; Seasons; Sex hormones; Sport fishing; Vitellogenesis; vitelogênese; Argentina; Netherlands; gonadal maturation; Characiformes; vitelogênese; Characiforms; maturação gonadal; vitellogenesis; fotoperíodo; photoperiod
• ISSN: 1519-6984; 1678-4375; 1678-4375
• DOI: 10.1590/1519-6984.188607

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.