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Titolo:
Circadian biorhythm of melatonin level in swordtail (Xiphophorus helleri)
Autore:
Rajchard, J; Hajek, I; Sery, M;
Indirizzi:
Acad Sci Czech Republ, Inst Physiol, Prague, Czech Republic Acad Sci CzechRepubl Prague Czech Republic iol, Prague, Czech Republic Univ S Bohemia, Pedag Fac, Dept Phys, Ceske Budejovice, Czech Republic Univ S Bohemia Ceske Budejovice Czech Republic dejovice, Czech Republic Univ S Bohemia, Fac Agr, Dept Ecol, Ceske Budejovice, Czech Republic Univ S Bohemia Ceske Budejovice Czech Republic dejovice, Czech Republic
Titolo Testata:
CZECH JOURNAL OF ANIMAL SCIENCE
fascicolo: 4, volume: 45, anno: 2000,
pagine: 153 - 160
SICI:
1212-1819(200004)45:4<153:CBOMLI>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
TROUT PINEAL; DAILY CYCLES; SECRETION; PHOTORECEPTORS; PHOTOPERIOD; PLASMA; LIGHT;
Keywords:
swordtail (Xiphophorus helleri); melatonin; light regime;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Rajchard, J Jihoceska Univ, Zemedelska Fak, Katedra Ecol, Studentska 13, Ceske Budejovice 37005, Czech Republic Jihoceska Univ Studentska 13 Ceske Budejovice Czech Republic 37005
Citazione:
J. Rajchard et al., "Circadian biorhythm of melatonin level in swordtail (Xiphophorus helleri)", CZEC J ANIM, 45(4), 2000, pp. 153-160

Abstract

Many biological features of fish of the genus Xiphophorus are very suitable for use of these organisms in different domains of biological research, e. g. developmental biology, genetics, oncology and others. The aim of this study was to monitor the melatonin level in swordtail (Xiphophorus helleri)under different light conditions: LD 12:12, 16:8, 20:4 (L: 13.00-9.00), constant light and constant dark. Melatonin level was detected by radioimmunoanalysis (RIA). 30 adult individuals on average were used in each experiment. Fish of "Berlin" line were used in one experiment only. Its number was also 30 individuals. For comparison of melatonin levels in brain, eyes and intestine a group of 45 individuals was used. Daily course of melatonin production in Xiphophorus helleri under the light regime LD 12:12 (L: 6.00-18.00) Suggests the existence of circadian rhythm. Other modifications of lightregime indicate the influence of light conditions, and constant conditionsalso indicate the presence of an endogenous rhythm. Significantly higher (P < 0.05) values of melatonin level in males compared to females under light regime LD 20:4 (L: 13.00-9.00) were found. In other cases including lightconditions LD 12:12 the differences between both sexes were not significant. The difference between melatonin levels in fish of original form and individuals of "Berlin" line under light conditions LD 12:12 was significant (P < 0.05, higher in line "Berlin"). Positive correlations between melatoninlevel in the brain, eyes and gastrointestinal tract were found.

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Documento generato il 27/10/20 alle ore 08:04:23