No Thumbnail Available

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

Year of publication 1986

Pages p. 12

Author Radhayshyam, B.B. Satpathy and V.R.P. Sinha;Fisheries and Aquaculture Management Division

Product type Project

Category Programme / project report

Edition 1

Synopsis (short abstract) 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.

Language English

Also available in:
No results found.

Related items

Showing items related by metadata.

  • No Thumbnail Available
    Book (series)
    Technical study
    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
    Project
    Guideline
    Guidelines for monitoring of productivity in fish ponds
    Establishment of a Network of Aquaculture Centres in Asia
    1985
    Also available in:
    No results found.
  • No Thumbnail Available
    Book (series)
    Technical report
Show more

Users also downloaded

Showing related downloaded files
Show more