Abstract
Fort Moats, Temple ponds and Rock pools situated in South India, are familiar hypertrophic ecosystems. Vellore Fort Moat is heavily polluted by sewage and develops a permanent bloom of Microcystis aeruginosa. Supersaturation of oxygen at the surface and complete depletion of oxygen at the bottom are characteristic features, of this moat. High levels of organic carbon (mostly sestonic), and nitrogen also occur in this ecosystem. Very high primary production was recorded from this moat. Fish production ranged from 14,344 to 51,092 kg/yr. (average 6914 kg/ha/yr.). As a result of this intensive fish harvest, there has been a change in the trophic status of this ecosystem.
Ooty Lake, a Coldwater lake situated in the Nilgiri Hills became hypertrophic following the spillage of sewage from conduits passing through the lake. Nuisance from the algae (Microcystis aeruginosa) as well as weeds occurred. Fish stocking in this lake also resulted in a modest yield of fish (mainly Cyprinus carpio). Recently, introduction of the Chinese grass carp, Ctenopharyngodon idella resulted in the complete elimination of submerged weeds such as Hydrilla verticellata, Najas graminiae, Potamageton perfoliatus. The silver carp, Hypophthalmichthys molitrix also grows well in this plankton rich water. Diversion of sewage also has caused a change in the trophic status of this lake.
A sewage oxidation pond was utilized for fish culture and yielded over 9000 kg/ha.
Though not polluted by sewage, a temple pond with hypertrophic characteristics was noticed. A blanket of bluegreens lead to imbalance with high oxygen in the surface and depletion at the 2.0 m depth. P/R ratio less than 1.0 was often noted.
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© 1980 Dr. W. Junk b.v. Publishers-The Hague, The Netherlands
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Sreenivasan, A. (1980). Fish Production in Some Hypertrophic Ecosystems in South India. In: Barica, J., Mur, L.R. (eds) Hypertrophic Ecosystems. Developments in Hydrobiology, vol 2. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-9203-0_30
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DOI: https://doi.org/10.1007/978-94-009-9203-0_30
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