Factors influencing migration of Metapenaeus dobsoni (Miers, 1878) in the Negombo Lagoon


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Authors

  • P A A T Jayawardane Marine Biological Resources Division, National Aquatic Resources Research and Development Agency, Crow Island, Mattakkuliya, Colombo 15, Sri Lanka.
  • M G K Gunawardane Marine Biological Resources Division, National Aquatic Resources Research and Development Agency, Crow Island, Mattakkuliya, Colombo 15, Sri Lanka.

Abstract

The factors influencing migration of M. dobsoni in the Negombo lagoon, Sri
Lanka are presented. Juveniles of M. dobsoni occur in the Negombo lagoon and
on maturing they return to the sea off Negombo for reproduction. The cohort
analysis indicated two pulses of immigration to the nursery areas in February
and June. The estimated growth rates for juveniles were relatively high compared
to that of adults. Three groups of shrimps were identified in the lagoon :
small quick movers, larger long stay ones and an intermediate group. Emigration
is not restricted to maturing juveniles but occurs across all the ages. There
were few identifiable emigration pulses from lagoon towards the off shore areas.
It appears that the resultant osmotic stress due to low saline waters in the
lagoon during the periods with high precipitation levels may be the strongest
influence triggering the onset of emigration of shrimps.

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Author Biographies

  • P A A T Jayawardane, Marine Biological Resources Division, National Aquatic Resources Research and Development Agency, Crow Island, Mattakkuliya, Colombo 15, Sri Lanka.
    Marine Biological Resources Division, National Aquatic Resources Research and
    Development Agency, Crow Island, Mattakkuliya, Colombo 15, Sri Lanka.
  • M G K Gunawardane, Marine Biological Resources Division, National Aquatic Resources Research and Development Agency, Crow Island, Mattakkuliya, Colombo 15, Sri Lanka.
    Marine Biological Resources Division, National Aquatic Resources Research and
    Development Agency, Crow Island, Mattakkuliya, Colombo 15, Sri Lanka.

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Issue

Vol. 50 No. 4 (2003)

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

Jayawardane, P. A. A. T., & Gunawardane, M. G. K. (2011). Factors influencing migration of Metapenaeus dobsoni (Miers, 1878) in the Negombo Lagoon. Indian Journal of Fisheries, 50(4), 439-453. https://epubs.icar.org.in/index.php/IJF/article/view/7659