STUDIES ON THE AGE DETERMINATION AND GROWTH OF NEMIPTERUS JAPONICUS (BLOCH) OFF VISAKHAPATNAM


114 / 179

Authors

  • D Manikyala Rao Department of Zoology, Andhra University, Waltair, Andhra Pradesh.
  • K Srinivasa Department of Zoology, Andhra University, Waltair, Andhra Pradesh.

Abstract

The age composition of the threadfin bream, Nemipterus japonicus, landed
by trawlers at the Visakhapatnam fishing harbour during 1977-79 has been determined
based on the scale and length-frequency studies. The growth rings have
been identified on scales, which are evidently biannual, one forming in January-
March, when the feeding is poor, and another in August-October, at the time of
gonadal maturation and spawning. Back-calculations made based on the relationship
between log standard length and log magnified scale radius have been verified
with the mean lengths at different ages as obtained by the length-freqency analysis.
The weighted mean lengths read from scale are 9.58 cm, ^12.32 cm, 14.32 cm, 16.11
cm, 17.43 cm and 18.60 cm, respectively at the end of 6, 12, 18, 24, 30 and 36
months. The maximum age of fish in the fishery is calculated to be three years
(the maximum standard length noted was 23.1 cm), with late 0-year and one-year
classes predominating. The Gompertz growth curve is found to be the best fit to
describe the growth, the values of L^^ and K being 21.96 and 0.6244, respectively

Downloads

Download data is not yet available.

Author Biographies

  • D Manikyala Rao, Department of Zoology, Andhra University, Waltair, Andhra Pradesh.
    Department of Zoology, Andhra University, Waltair, Andhra Pradesh.
  • K Srinivasa, Department of Zoology, Andhra University, Waltair, Andhra Pradesh.
    Department of Zoology, Andhra University, Waltair, Andhra Pradesh.

Downloads

Issue

Vol. 33 No. 4 (1986)

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

Rao, D. M., & Srinivasa, K. (2011). STUDIES ON THE AGE DETERMINATION AND GROWTH OF NEMIPTERUS JAPONICUS (BLOCH) OFF VISAKHAPATNAM. Indian Journal of Fisheries, 33(4), 426-439. https://epubs.icar.org.in/index.php/IJF/article/view/10932