INDEX OF PREPONDERANCE—A METHOD OF GRADING THE FOOD ELEMENTS IN THE STOMACH ANALYSIS OF FISHES


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Authors

  • A V Natarajan Central Inland Fisheries Research Substation, Allahabad
  • A G Jhingran Central Inland Fisheries Research Substation, Allahabad

Abstract

VARIOUS methods are in prevalence in the studies of stomach analysis offishes and these were critically discussed by Hynes (1950) and Pillay (1952).They comprise chiefly in studying the frequency of occurrence of food itemsas well as bulk. The 'occurrence' method is insulated from the quantitativeelement and similarly quantitative methods of 'occurrence' element.On account of the restricted scope of these two types of analyses they areindividually not suited for the purpose of grading the food components ofgut contents. An Index taking these two factors into consideration seemsto be desirable for this purpose and accordingly a composite Index—designatedas the 'Index of Preponderance'—was constructed from volume and'occurrence' index. The mean Index of feeding, proposed by lizuka et af.(1954) is different in scope and considers the ratio of volume of the feed tovolume of animal, the volume being treated as a function of length. Theirmethod gives an index of feeding intensity.

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Author Biographies

  • A V Natarajan, Central Inland Fisheries Research Substation, Allahabad
    Central Inland Fisheries Research Substation, Allahabad
  • A G Jhingran, Central Inland Fisheries Research Substation, Allahabad
    Central Inland Fisheries Research Substation, Allahabad

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Issue

Vol. 8 No. 1 (1961)

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

Natarajan, A. V., & Jhingran, A. G. (2011). INDEX OF PREPONDERANCE—A METHOD OF GRADING THE FOOD ELEMENTS IN THE STOMACH ANALYSIS OF FISHES. Indian Journal of Fisheries, 8(1), 54-59. http://epubs.icar.org.in/index.php/IJF/article/view/13580