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Temporal Variation in the Hydrobiology of Vembanad Lake at Panangad-Kumbalam Mangrove Patches of Kochi, Kerala

Author Affiliations

  • 1Department of Fisheries Biology and Resource Management, Fisheries College and Research Institute, Tamil Nadu Fisheries University, Thoothukudi-628 008, Tamil Nadu, INDIA
  • 2 School of Fisheries Resource Management and Harvest Technology, Faculty of Fisheries, Kerala University of Fisheries and Ocean Studies, Panangad, Kochi 682506, Kerala, INDIA
  • 3 School of Fisheries Resource Management and Harvest Technology, Faculty of Fisheries, Kerala University of Fisheries and Ocean Studies, Panangad, Kochi 682506, Kerala, INDIA
  • 4 School of Fisheries Resource Management and Harvest Technology, Faculty of Fisheries, Kerala University of Fisheries and Ocean Studies, Panangad, Kochi 682506, Kerala, INDIA
  • 5 School of Fisheries Resource Management and Harvest Technology, Faculty of Fisheries, Kerala University of Fisheries and Ocean Studies, Panangad, Kochi 682506, Kerala, INDIA

Res. J. Animal, Veterinary and Fishery Sci., Volume 3, Issue (3), Pages 1-7, March,24 (2015)

Abstract

The present investigation scrutinized the hydrobiological status of Vembanad Lake at Panangad-Kumbalam mangrove patches of Kochi. Distinct variations of hydrographic state and its influence on zooplankton abundance were observed. Study area revealed presence of 13 mangrove species belonging to 7 family and 9 genera. Salinity showed wide fluctuation (1.70 to 30.5). Average salinity was 19.74 indicated mesohaline nature. The average annual temperature was comparatively normal (28.94C). Transparency showed lowest value during July (39.3 cm). The average pH during the study period was (7.38) on alkaline side. Dissolved oxygen was high (7.7 mg/l) during October compared March (3.9 mg/l). The average alkalinity was 95.83 mg/l. Nitrate values ranged from 2.40 g/l to 35.90 g/l. The phosphate value ranged between 0.90 g/l and 9.0 g/l with an average of 3.0 g/l. Primary productivity showed an average of 1337.08 mg C/m3/day productive nature indicated backwater. Total number of copepods ranged from 2013 numbers/m3 to 5347 numbers/m3. Total number of cladocerans ranged from 8 numbers/m3 to 471 numbers/m3. Total number of rotifers ranged from 306 numbers/m3 to 1263 numbers/m3. Onset of monsoon appeared to be major factor influencing the hydrography, primary productivity and zooplanktons abundance in the backwater.

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