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Phytoplankton and zooplankton of some paddy-cum-prawn culture fields in and around Cochin

DRS at CSIR-National Institute of Oceanography

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Title Phytoplankton and zooplankton of some paddy-cum-prawn culture fields in and around Cochin
 
Creator Gopalakrishnan, T.C.
Devi, C.B.L.
Aravindakshan, P.N.
Nair, K.K.C.
Balasubramanian, T.
Kutty, M.K.
 
Description The Phytoplankton and zooplankton from the paddy-cum-prawn culture fields from 4 areas in and around the Cochin backwaters were studied. Total Phytoplankton counts in the seasonal and perennial fields in all the areas showed good similarity with maximum during the monsoon period but with onsiderable fluctuation in abundance. Highest average count of 4617 cells/l with minimum fluctuation was observed in the seasonal fields in area 2. The high concentration of nutrients in these fields, did not appear to exert any adverse effect on Phytoplankton since maximum number of enera and uniform abundance were observed here. Zooplankton counts in all the areas were generally low.
Quantitative and qualitative aspects of Phytoplankton and zooplankton in the 4 areas showed that the striking regional differences in salinity and nutrient concentrations have not exerted appreciable effect on them to demarcate these regions on the basis of such differences. (More frequent occurrence of unialgal blooms and total absence of zooplankton in many samples at the station close to the effluent discharge site of a fertilizer factory in area 2 however suggests adverse effect of extreme concentrations of nutrients (N02, 539.0; N03, 312.5; PO4, 2195.0 and NH4, 3980.0 ?g at/I.), although it seems to get diluted to safer limits by the time it reaches the seasonal fields. Otherwise, the impact of the regional differences in the estuarine environment in all the areas studied appear less in the lower trophic level. )The study also indicates that the cause for the variations in the tertiary production, especially of prawns in the different regions cannot be ascribed to excess nutrient concentrations either directly or by affecting primary and secondary production.
 
Date 2006-04-10T07:44:18Z
2006-04-10T07:44:18Z
1988
 
Type Journal Article
 
Identifier Mahasagar, vol.21, 85-94
http://drs.nio.org/drs/handle/2264/53
 
Language en
 
Format 345632 bytes
application/pdf
 
Publisher National Institute of Oceanography, Goa