Circadian Rhythms in Locomotor Activity of the Hagfish, Eptatretus burgeri V. The Effect of Light Pulses on the Free-running Rhythm

Ooka-Souda, Sadako; Kabasawa, Hiroshi

doi:10.2108/zsj.12.337

Cited by 16 publications

(13 citation statements)

References 8 publications

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“…8). Inter‐ and intraspecific variations in the times required for resynchronization of daily rhythms in fish have been reported ( Ooka‐Souda et al . 1985 ; Boujard et al .…”

Section: Discussionmentioning

confidence: 99%

“…The introduction of phase shifts into the LD cycle has been used to examine the strength of circadian oscillator(s) in fish species ( Ooka‐Souda, Kabasawa & Kinoshita 1985; Boujard, Keith & Luquet 1990; Kabasawa & Ooka‐Souda 1991; Sánchez‐Vázquez et al . 1995 ; Iigo & Tabata 1997); the longer the time required for resynchronization of rhythms, the stronger the circadian oscillator(s) are deemed to be.…”

Section: Discussionmentioning

confidence: 99%

“…6). This may suggest that the ®sh recognize the LD 6:6:6:6 cycle as an ultradian LD pulse, possibly analogous to the ultradian LD pulse of 0.75:0.25 h to brown bullhead Ictalurus nebulosus (Le Sueur) (Eriksson & van Veen 1980), 40:40 min to sea bass The introduction of phase shifts into the LD cycle has been used to examine the strength of circadian oscillator(s) in ®sh species (Ooka-Souda, Kabasawa & Kinoshita 1985;Boujard, Keith & Luquet 1990;Kabasawa & Ooka-Souda 1991;Sa Ânchez-Va Âzquez et al 1995;Iigo & Tabata 1997); the longer the time required for resynchronization of rhythms, the stronger the circadian oscillator(s) are deemed to be. If LD cycles exert strong in¯uences over rhythms, ®sh will synchronize quickly to a phaseshifted LD cycle, demonstrating that rhythms are mainly controlled exogenously (Aschoff 1981).…”

Section: Discussionmentioning

confidence: 99%

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Diel feeding rhythms of greenback flounderRhombosolea tapirina(Günther 1862): the role of light-dark cycles and food deprivation

Chen

Purser

Blyth³

1999

Aquaculture Research

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The role of light–dark (LD) cycles and food deprivation in the regulation of diel feeding rhythms in greenback flounder Rhombosolea tapirina (Günther 1862) was examined. A computerized monitoring system was developed to record uneaten pellets, and food intake was estimated as the difference between pellets presented and those uneaten. Three groups of five fish each (75–281 g) were exposed sequentially to the LD cycles: LD 12:12, LD 12:12 (scotophase advanced by 9 h), LD 6:18, DD, LD 6:6:6:6, LL and LD 12:12 (return to the initial cycle). Illumination was 120 lux at the water surface (complete darkness at scotophase), and water temperature was 15 ± 1 °C. Fish fed mainly during the light hours under LD 12:12 and resynchronized to the scotophase‐advanced LD 12:12 regime after about 12 h. Feeding started at the onset of light and extended to the early scotophase under LD 6:18. A circadian feeding rhythm was detected in fish under DD and LD 6:6:6:6 regimes. Under the LL regime, two groups of fish displayed arrhythmic feeding patterns and did not resynchronize to LD 12:12 for at least 13 days. In contrast, the third group of fish exhibited a circadian feeding rhythm under the LL regime and immediately re‐entrained to LD 12:12. Fish were deprived of food for a single period of 26–57 h once feeding patterns had been established under LD 12:12, LD 12 : 12 (scotophase advanced by 9 h) and DD regimes, and feed delivery was resumed during the scotophase or subjective night; the timing of feeding rhythms was shifted by the reintroduction of feed, but progressively resynchronized to the LD cycles. The results suggest that the greenback flounder is a diurnal feeder, that a LD 12:12 cycle is a potent environmental cue to entrain circadian feeding rhythms, and that a biological clock is involved in the timing of feeding.

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“…8). Inter‐ and intraspecific variations in the times required for resynchronization of daily rhythms in fish have been reported ( Ooka‐Souda et al . 1985 ; Boujard et al .…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Diel feeding rhythms of greenback flounderRhombosolea tapirina(Günther 1862): the role of light-dark cycles and food deprivation

Chen

Purser

Blyth³

1999

Aquaculture Research

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show abstract

“…Shifting the LD cycle has been used to analyze the endogenous control of circadian rhythms in many fish species (Ooka-Souda et al, 1985Ooka-Souda, 1989,1991;Tabata et al, 1989). The number of transient cycles required to resynchronize daily rhythms indicates the strength of the endogenous timing mechanism.…”

Section: Discussionmentioning

confidence: 99%

Circadian Rhythms of Feeding Activity in Sea Bass, Dicentrarchus labrax L.: Dual Phasing Capacity of Diel Demand-Feeding Pattern

1995

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The nocturnal versus diurnal feeding patterns of sea bass under controlled experimental conditions were studied in order to investigate the existence of such a dualistic feeding behavior. The animals (six groups of 4 animals and 8 single fish) were held in tanks filled with recirculating salt water and installed in a "chronolab" under constant conditions (23.5 degrees C and 2.4% salinity). The fish were given access to self-demand feeders and first exposed to a photoperiod regime of 12:12 (12 h light, 70 lx, and 12 h dark, complete darkness) and then to light:dark (LD) pulses (40 min light, 40 min dark). The LD 12:12 cycle was reversed by doubling the light period in day 16, and reversed again in day 27 by doubling the dark period. The circadian rhythm of food demand was strongly synchronized with the LD cycle, and fish exhibited both diurnal and nocturnal patterns. In most fish, the shift of the feeding rhythm to the new LD cycle was very fast for each reversal (bringing forward or delaying their feeds 12 h), indicating a weak participation of an endogenous circadian rhythm. However, when submitted to LD pulses, fish began to free-run with a periodicity of about 23 h and kept feeding in the light or dark phase according to their prior behavior. The existence of a dualism in the diel feeding pattern in sea bass was thus clearly demonstrated and it appeared that the diurnal and nocturnal behavior did not depend exclusively on a circadian phase inversion of the feeding rhythms as this pattern of behavior was enhanced under ultradian LD pulses. The ecological implications of such dual capacity and the switch from one type of phasing to another are hitherto unknown and need further field and laboratory investigation.

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“…In fish, photosensitive and multioscillatory units have been identified in nervous and peripheral tissues [5]. However, there is evidence that the master circadian clocks are located in photoreceptor cells of the eyes and pineal organ [6,7] and perhaps in the hypothalamus, the nuclei of which receive nonvisual input from the retina [8][9][10][11] (Figure 1a). The relative strength and coupling of each of these 'oscillators' is species dependent [12].…”

Section: Introductionmentioning

confidence: 99%

Melatonin effects on the hypothalamo–pituitary axis in fish

Falcón

Besseau

Sauzet

et al. 2007

Trends in Endocrinology & Metabolism

244

159

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Circadian Rhythms in Locomotor Activity of the Hagfish, Eptatretus burgeri V. The Effect of Light Pulses on the Free-running Rhythm

Cited by 16 publications

References 8 publications

Diel feeding rhythms of greenback flounderRhombosolea tapirina(Günther 1862): the role of light-dark cycles and food deprivation

Diel feeding rhythms of greenback flounderRhombosolea tapirina(Günther 1862): the role of light-dark cycles and food deprivation

Circadian Rhythms of Feeding Activity in Sea Bass, Dicentrarchus labrax L.: Dual Phasing Capacity of Diel Demand-Feeding Pattern

Melatonin effects on the hypothalamo–pituitary axis in fish

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