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Effects of some water quality parameters and some metals on osmoregulation of Oreochromis mossambicus in Bolgoda lake
By Dewwanthi Karunarathna | January 18, 2008
The present study was carried out in Bolgoda Lake at Attidiya, Borupona and Dampe from September 2005 to January 2006 with the objective of studying the effect of some water quality & some heavy metals on Osmoregulation of Oreochromis mossambicus. Only the Dissolved Oxygen and Transparency showed significant difference among measured water quality parameter within 3 sites. The highest value of Dissolved Oxygen (9.40 ± 1.56 mg/l) was recorded at Attidiya & lowest from Borupona (3.88 ± 1.1 mg/l). Dissolved Oxygen of Dampe was 6.44 ± 2.20 mg/l. Osmoregulatory Capacity of three sites were significantly different. Maximum Osmoregulatory Capacity (240.90 ± 2.01) was recorded in Borupona and minimum Osmoregulatory Capacity (126.30 ± 1.12) was recorded in Dampe station. Osmoregulatory Capacity of Attidiya was 168.70 ± 0.79. A significant negative correlation of Dissolved Oxygen was recorded with Osmoregulatory Capacity. Transparency also made great effect to the Osmoregulatory Capacity. Maximum Osmoregulatory Capacity value was recorded in Borupona that has high transparency (87 ± 1.1 cm) and with low Transparency (65 ± 0.71cm) minimum Osmoregulatory Capacity value was recorded. That was in Dampe station. Transparency of Attidiya was 80 ± 0.79 cm.
There was a significant difference (P<0.05) in the metal levels in a particular organs (gills, muscles) and between the three sites. Gills recorded highest values for all measured metals in three sites. Most abundant metal in three sites was Fe. The Highest value was recorded in Attidiya (2940 ± 27.3µg/g). The lowest Fe value was recorded in Borupona (1290 ± 31.5 µg/g). Next most abundant metal was Zn. The highest value of Zn (805 ± 7.43µg/g) was recorded in Dampe and lowest value was recorded in Borupona (382 ± 3.59µg/g). Cu was found only in Attidiya site, but it was very low, relative to the other elements. A significant negative correlation with Osmoregulatory Capacity was observed for Zn in gills & muscles.
K W M Irodanie and A G D H Senevitathne
Department of Zoology, University of Sri Jayewardenepura, Sri Lanka.
Topics: Pollution control, symposium 2006 |