PATTERNS OF SEX RA-HO IN THE OIL-SARDINE, SARDINELLA LONGICEPS VAL., AT CALICUT


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Authors

  • B T Antony Raja Central Marine Fisheries Research Institute; Sub-station, Karwar, Mysore State

Abstract

Categorising the fish according to maturity, montti of capture and length groups,
the data on the sex distribution of the Indian oil-sardine (5flrrfwW/fl/ong'/fepj) collected
at Calicut during 1959-60 to 1965-66 seasons are subjected to statistical tests to find outthe
nature and cause of dominance of either sex, if any.
For the immature fish the overall inference is that there may not be any significant
difierences in the annual recruited population. In the adult fish the possibility of
more males in May is suggested as due to the fact that the males may start maturing a
little earlier than the females. The dominance of males in 140-150 mm group and that of
females in 170-190 mm groups is brought about by differential growth, the females
growing faster during June to October period. It is recommended that the size of each
sample for sex ratio studies should be at least 50. Based on the earlier and the present
studies of this author, It is indicated that 375 million ova can be expected from a tonne of
adult biomass of the oil-sardine population.

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Author Biography

  • B T Antony Raja, Central Marine Fisheries Research Institute; Sub-station, Karwar, Mysore State
    Central Marine Fisheries Research Institute; Sub-station,
    Karwar, Mysore State

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Issue

Vol. 16 No. 1 & 2 (1969)

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

Raja, B. T. A. (2011). PATTERNS OF SEX RA-HO IN THE OIL-SARDINE, SARDINELLA LONGICEPS VAL., AT CALICUT. Indian Journal of Fisheries, 16(1 & 2), 99-109. https://epubs.icar.org.in/index.php/IJF/article/view/13245