No Thumbnail Available

Community metabolism in tropical undrainable rural fish ponds

Establishment of a Network of Aquaculture Centres in Asia

Year of publication 1987

Pages p. 7

Author Olah, J.,Sinha, V.R.P.,Ayyappan, S.,Purushothaman, C.S.,Radheyshayam, S.;Fisheries and Aquaculture Management Division

Product type Project

Edition 1

Synopsis (short abstract) The process of community metabolism including primary production and community respiration in eighteen undrainable rural fish ponds in India was quantified using the diurnal oxygen curve method. A considerable portion of the gross primary production that was in the moderate ranges, was consumed for the community respiration. Negative, and low positive values of net primary production indicated the significance of the allochthonous supply in these organic enriched systems. The low values of sedim ent respiration signified the reduced condition of stagnating sediment acting as energy trap.

Language English

Also available in:
No results found.

Related items

Showing items related by metadata.

  • No Thumbnail Available
    Project
    Environmental diel cycle during mass fish kills and planktonic collapse in an undrainable rural fish pond
    Establishment of a Network of Aquaculture Centres in Asia
    1986
    Also available in:
    No results found.
    With a view to find out the possible causes for the sudden occurrence of large scale mortality of fish and fish food organisms in a shallow pond of 1.25 ha on a hot summer day (June 5, 1982), the diurnal variation of physico-chemical factors and plankton density were studied. Water temperature (29.0–37.5°C), free carbon dioxide (0–32.0 ppm) and dissolved oxygen (0.08–11.6 ppm) showed marked fluctuation round the clock. Phytoplankton density was found to be maximum at 5.00 am. and minimum at 9.00 p.m. and during day time was markedly less. Volumetric estimation of plankton revealed a considerable decline in plankton biopmass (71.32%) over a period of 3 days during the hot spell (June 5–8, 1982). The computed loss in density of phytoplankters was 2981 u/1 and that of zooplankters 2354 u/1 during the period. The dead fishes included Cyprinus carpio, Cirrhinus mrigala, Catla catla and Labeo rohita. The lethal conditions for aquatic life occurred with high temperature and complete deple tion of dissolved oxygen in the day time and the sharp rise in free carbon dioxide in the night. The adverse environmental conditions were further aggravated due to very low water level, high concentration of suspensoids of particulate and colloidal matter at the pond bottom and high rate of decomposition of organic matter etc., which seem to have been cumulatively responsible for the sudden mortality of fishes and the collapse of planktonic organisms.
  • No Thumbnail Available
    Book (series)
    Fish Culture in undrainable ponds - A manual for extension 1992
    Also available in:
    No results found.
    This manual deals with the methods of freshwater fish culture in undrainable ponds as practised in India. The manual is primarily meant for extension workers and aquaculture training institutions. It outlines the basic principles of fish culture and the characteristics of undrainable ponds. The systems of composite carp culture and composite carp culture-livestock farming have been described. Methods of improvement of existi ng ponds and construction of new ponds have been included. The suitable species for culture, procurement of their seed, stocking ratios of various species under composite culture, etc., have been discussed. Pond management, both pre-stocking and post-stocking, including fish health management and management of common hazards have been dealt with. It also contains information on marketing and economics of fi sh culture in undrainable ponds.
  • No Thumbnail Available
Show more

Users also downloaded

Showing related downloaded files

No results found.