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Spawning habits of some Philippine tuna based on diameter measurements of the ovarian ova / Daniel M. Buñag

By: Material type: ArticleArticlePublisher: Quezon City, Philippines : Bureau of Fisheries and Aquatic Resources , 1956Content type:
  • text
Media type:
  • computer
Carrier type:
  • online resource
ISSN:
  • 2672-2836 (Online)
Subject(s): Online resources: In: Philippines. The Philippine Journal of Fisheries Volume 4, Issue no. 2 (July to December 1956), page 145-177Abstract: The ecology of the tuna, its large size, and extensive migratory habits precludes a direct study of much of its life history. Its spawning habits have, consequently, been largely approached by such indirect methods as collecting juvenile stages and planktonic eggs, size at its first sexual maturity, and year classes based on the commercial catch, etc. The present study is an at¬tempt to add to our knowledge of the spawning behavior of Philippine tuna through the statistical analysis of growth of the ova in the ovary by measuring their increasing diameters. This method was developed by Thompson (1915) and success¬fully employed by such investigators as Clark (1925, 1929, 1934); De Jong (1940); Hickling and Rutemberg cited by De Jong (1940) ; and Mane (1929, 1934). The following com¬mercially important species of Philippine tuna were considered in the present study: Neothunnus macropterus, Katsuwonus pelamis, and Euthynnus yaito.
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Holdings
Item type Current library Collection Call number Vol info Status Date due Barcode
Journal Article Journal Article NFRDI Central Office NFRDI KMRC Indexed Materials Collection Electronic Volume 4, Issue no. 2 (July to December 1956), page 145-177 Available IMC000045
Journal Journal NFRDI Central Office NFRDI KMRC Institutional Repository Collection Electronic SH 1 .B9524 1956 vol. 4 no. 2 (Browse shelf(Opens below)) Volume 4, No. 2 (July - December 1956) Available IRC00008

Includes bibliographical references

The ecology of the tuna, its large size, and extensive migratory habits precludes a direct study of much of its life history. Its spawning habits have, consequently, been largely approached by such indirect methods as collecting juvenile stages and planktonic eggs, size at its first sexual maturity, and year classes based on the commercial catch, etc. The present study is an at¬tempt to add to our knowledge of the spawning behavior of Philippine tuna through the statistical analysis of growth of the ova in the ovary by measuring their increasing diameters. This method was developed by Thompson (1915) and success¬fully employed by such investigators as Clark (1925, 1929, 1934); De Jong (1940); Hickling and Rutemberg cited by De Jong (1940) ; and Mane (1929, 1934). The following com¬mercially important species of Philippine tuna were considered in the present study: Neothunnus macropterus, Katsuwonus pelamis, and Euthynnus yaito.

English eng

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