Spermatogenesis and spermatozoal ultrastructure in Metapenaeus monoceros (Fabricius, 1798)


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Authors

  • Joice Abraham Central Marine Fisheries Research Institute, Cochin – 682 018, India
  • Mary K Manissery Central Marine Fisheries Research Institute, Cochin – 682 018, India
  • N K Sanil Central Marine Fisheries Research Institute, Cochin – 682 018, India

Abstract

Spermatogenesis in the ‘speckled shrimp’ Metapenaeus monoceros (Fabricius,
1798) was studied employing histological and transmission electron microscopic
techniques. Male specimens of the species were classified into three maturity
stages based on gross morphology. Spermatozoa of M. monoceros was observed
to be unistellate with a spherical main body and a spike. The main body was
made up of a central nuclear region, a peripheral cytoplasmic band and an
acrosomal cap, which overlaid the nuclear region anteriorly. From the acrosomal
cap projected an extended spike towards the anterior of the spermatozoa. The
spike and the acrosomal cap together were called the acrosomal vesicle. The
average length of the spermatozoa was 6μ m. The main body had a mean diameter
of 3.4μ m with the spike measuring 2.6μ m in length.

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Author Biographies

  • Joice Abraham, Central Marine Fisheries Research Institute, Cochin – 682 018, India
    Central Marine Fisheries Research Institute, Cochin – 682 018, India
  • Mary K Manissery, Central Marine Fisheries Research Institute, Cochin – 682 018, India
    Central Marine Fisheries Research Institute, Cochin – 682 018, India
  • N K Sanil, Central Marine Fisheries Research Institute, Cochin – 682 018, India
    Central Marine Fisheries Research Institute, Cochin – 682 018, India

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Issue

Vol. 54 No. 1 (2007)

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

Abraham, J., Manissery, M. K., & Sanil, N. K. (2011). Spermatogenesis and spermatozoal ultrastructure in Metapenaeus monoceros (Fabricius, 1798). Indian Journal of Fisheries, 54(1), 1-9. http://epubs.icar.org.in/index.php/IJF/article/view/6872