DIURNAL VARIATIONS IN PHYSICO-CHEMICAL FACTORS AND ZOOPLANKTON IN THE SURFACE LAYERS OF THREE FRESHWATER FISH PONDS


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Authors

  • R George Michael Central Inland Fisheries Research Institute, Ponneri

Abstract

MANY aquatic organisms exhibit diurnal rhythms in their activities.
Although factors such as light, temperature, food, sex and size have been
attributed as probable causes for such behaviour of planktonic organisms,
subsurface illumination for the 24-hour period has been found to be the
most essential stimulus (Lagarigue, 1949; Wells, 1960). Earlier investigations
on this aspect have been reviewed by Gushing (1951), Welch (1952),
Motoda (1953) and Davis (1955). While more or less adequate information
on the diurnal variations in freshwater impoundments of temperate regions
is available, similar works in the tropics are very few, as recently pointed
out by George (1961).

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Author Biography

  • R George Michael, Central Inland Fisheries Research Institute, Ponneri
    Central Inland Fisheries Research Institute, Ponneri

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Issue

Vol. 13 No. 1 & 2 (1966)

Section

Articles

License

The copyright of the articles published in Indian Journal of Fisheries vests with the Indian Council of Agricultural Research, who has the right to enter into any agreement with any organization in India or abroad engaged in reprography, photocopying, storage and dissemination of information contained in these journals. The Council has no objection in using the material, provided the information is being utilized for academic purpose but not for commercial use. Due credit line should be given to the ICAR where information will be utilized.

How to Cite

Michael, R. G. (2011). DIURNAL VARIATIONS IN PHYSICO-CHEMICAL FACTORS AND ZOOPLANKTON IN THE SURFACE LAYERS OF THREE FRESHWATER FISH PONDS. Indian Journal of Fisheries, 13(1 & 2), 48-82. https://epubs.icar.org.in/index.php/IJF/article/view/13509