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

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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 (28.94°C). 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 µg/l to 35.90 µg/l. The phosphate value ranged between 0.90 µg/l and 9.0 µg/l with an average of 3.0 µg/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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