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

Abraham, Joice and Manisseri, Mary K and Sanil, N K (2007) Spermatogenesis and spermatozoal ultrastructure in Metapenaeus monoceros (Fabricius, 1798). Indian Journal of Fisheries, 54 (1). pp. 1-9.


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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.

Item Type: Article
Uncontrolled Keywords: Spermatogenesis; spermatozoal ultrastructure; Metapenaeus monoceros
Subjects: Fish and Fisheries > Fish biology
Divisions: CMFRI-Cochin > Marine Capture > Crustacean Fisheries
Depositing User: Users 171 not found.
Date Deposited: 03 Nov 2010 11:32
Last Modified: 09 Sep 2015 15:35
URI: http://eprints.cmfri.org.in/id/eprint/5848

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