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IJEB Vol.44(01) [January 2006] >

Title: Air-breathing rhythm in Clarias batrachus (Linn.): Modulatory role of eyes, pineal and exogenous melatonin
Authors: Sahu, Swati
Shedpure, Maya
Keywords: Air-breathing
Circadian rhythm
Issue Date: Jan-2006
Publisher: CSIR
Abstract: Effects of enucleation followed by pinealectomy and administration of exogenous melatonin on air-breathing activity rhythm in a fresh water catfish, C. batrachus maintained at LD 12:12 and laboratary temperature during its prepratory phase, were examined. Results of cosinor analysis clearly reveal that most of the intact individuals exhibited circadian rhythm in their air-breathing activity and such rhythm persists even after enucleation followed by pinealectomy and then melatonin administration. However, the period () of the activity obtained by power spectrum analysis was prominent 24 hr in most of the intact individuals, but it was increased ( > 24 hr) after enucleation in most of the individuals. In most of the enucleated + pinealectomized individuals was less than 24 hr, and after receiving melatonin treatment was shifted to prominent 24 hr in most of the individuals. In addition, visual analysis of the actograms depicted that in intact individuals air-breathing activity is entrained with the timings of lights on/off with elevation of activity during dark period and decreased activity during light hours. However, enucleated and enucleated + pinealectomized individuals showed free run in their activity rhythm. The treatment of melatonin reestablished the entrainment of activity atleast with the timing of lights off, in most of the studied individuals. Further, daily mean of the air-breathing activity was decreased in enucleated + pinealectomized individuals as compared with other studied groups (intact, enucleated, enucleated + pinealectomized + melatonin receiving). It could be speculated that there may be existence of extraretinal and extrapineal photoreceptors in C. batrachus. However, eyes play an important role in regulating air-breathing activity rhythm in such species. In addition, exogenous melatonin may also have some modulatory effect on such rhythm.
Page(s): 55-62
ISSN: 0975-1009 (Online); 0019-5189 (Print)
Source:IJEB Vol.44(01) [January 2006]

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