Effects of UV-B radiation on the gills of Catla catla during early development

Authors: Sharma, Jai Gopal; Chakrabarti, Rina

Source: Toxicological and Environmental Chemistry, Volume 88, Number 2, April–June 2006 , pp. 367-371(5)

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Abstract:

Scanning electron microscopic (SEM) study of gills of Catla catla catla (17-day-old) exposed to UV-B radiation (145µWcm −2 at the water surface) for three different exposure times: 5, 10 and 15min was conducted. Fish without UV-B exposure served as control. UV-B radiation damaged both gill filaments and lamellae. The intensity of damage was minimal in 5min exposed fish, followed by 10min exposed fish and maximal in 15min. The gill epithelium was severely damaged in 15min irradiated fish compared to control. Pavement cells (PVCs) were damaged and the numbers of microridges within PVCs decreased. The deep boundary of PVC was not clear. In some area of gill epithelium, PVCs were destroyed and mitochondrion-rich cells (MRCs) were exposed. The 5min exposure reduced the number of microridges in the PVCs, but the boundary of PVCs was still visible. MRCs in the gill epithelium were not exposed in 5min exposed fish. The damage to PVCs and subsequent exposure of MRCs in UV-B irradiated fish may hamper respiratory functions and disturb osmoregulation in catla.

Keywords: Catla catla; UV-B radiation; gills; scanning electron microscopy

Document Type: Research article

DOI: http://dx.doi.org/10.1080/02772240600638096

Affiliations: 1: Aqua Research Lab, Department of Zoology, University of Delhi, Delhi, 110 007, India

Publication date: 2006-04-01