Journal Article

Light and dark rations and the photic entrainment of circadian locomotor activity patterns in the South American Silver Catfish (Rhamdia quelen, Quoy & Gaimard, 1824)

Scaglione, M.C., Cerutti, R.D., Arfuso, F. and Piccione, G.

Record Number:
4061
Year:
2018
Journal:
Biological Rhythms Research
Pages:
129-140
Volume:
49
Abstract:
Abstract: The aim of this study was to evaluate the daily rhythm of locomotor activity in Rhamdia quelen ( R. quelen ). A total of 30 fish were enrolled in the study and were equally divided in 10 groups and maintained in 100 liters tanks. The locomotor activity was measured in fish maintained under the LD 12:12 photoperiod regime; thereafter, the LD cycle was reversed to DL in order to study the resynchronization and to explore the endogenous pacemaker. Subsequently, the fish were subjected to constant conditions of light to test whether or not locomotor rhythms are regulated by the endogenous circadian clock. The effect of increasing light length and intensity was studied on daily rhythm of locomotor activity of fish. Our results showed that the R. quelen is a strictly diurnal species, the rhythm of locomotory activity resynchronized quickly after inverting the LD cycle and persist under free course LL, suggesting a circadian origin. The light showed a significant masking effect often blocking the expression of the biological rhythm. The strictly diurnal behavior is controlled directly by the photoperiod and maintained even under very dim light (30 lux).
Times Cited:
9
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Freshwater fished of North America. Volume 2 Characidae to Poeciliidae
Koerber, S. and Reis, R.E. (2020)
Evidence for the true type-locality of Rhamdia quelen (Siluriformes: Heptapteridae), and the geographical origin and invalid neotype designation of four of its synonyms
Koerber, S. and Reis, R.E. (2020)
Evidence for the true type-locality of Rhamdia quelen (Siluriformes: Heptapteridae), and the geographical origin and invalid neotype designation of four of its synonyms
Thomas, M.R. and Sabaj, M.H. (2020)
Heptapteridae: Seven-finned catfishes
Koerber, S. and Reis, R.E. (2020)
Evidence for the true type-locality of Rhamdia quelen (Siluriformes: Heptapteridae), and the geographical origin and invalid neotype designation of four of its synonyms
Koerber, S. and Reis, R.E. (2020)
Evidence for the true type-locality of Rhamdia quelen (Siluriformes: Heptapteridae), and the geographical origin and invalid neotype designation of four of its synonyms
Koerber, S. and Reis, R.E. (2020)
Evidence for the true type-locality of Rhamdia quelen (Siluriformes: Heptapteridae), and the geographical origin and invalid neotype designation of four of its synonyms
Koerber, S. and Reis, R.E. (2020)
Evidence for the true type-locality of Rhamdia quelen (Siluriformes: Heptapteridae), and the geographical origin and invalid neotype designation of four of its synonyms
Warren, M.L. and Burr, B.M. (2020)
Freshwater fished of North America. Volume 2 Characidae to Poeciliidae
Thomas, M.R. and Sabaj, M.H. (2020)
Heptapteridae: Seven-finned catfishes
Warren, M.L. and Burr, B.M. (2020)
Freshwater fished of North America. Volume 2 Characidae to Poeciliidae
Thomas, M.R. and Sabaj, M.H. (2020)
Heptapteridae: Seven-finned catfishes
Warren, M.L. and Burr, B.M. (2020)
Freshwater fished of North America. Volume 2 Characidae to Poeciliidae
Thomas, M.R. and Sabaj, M.H. (2020)
Heptapteridae: Seven-finned catfishes
Warren, M.L. and Burr, B.M. (2020)
Freshwater fished of North America. Volume 2 Characidae to Poeciliidae
Thomas, M.R. and Sabaj, M.H. (2020)
Heptapteridae: Seven-finned catfishes
Warren, M.L. and Burr, B.M. (2020)
Freshwater fished of North America. Volume 2 Characidae to Poeciliidae
Thomas, M.R. and Sabaj, M.H. (2020)
Heptapteridae: Seven-finned catfishes