architectural alterations and accumulation in the ovary of fresh water Teleost,
Channa punctata (bloch)
Helmlata Verma and
Fish Biology Laboratory, Center for Advanced Studies, Department of
Zoology, University of Rajasthan, Jaipur-302004, INDIA.
Abstract: Fresh water murrel, Channa
punctata were kept in aqueous solutions of zinc (Sub-lethal concentrations
of 8 mg/l, 10 mg/l and 15 mg/l) for 15 days. Results show reduced GSI and
ootoxic conditions. Oolytic changes include shrinkage of oocytes, which resulted
in large interfollicular spaces. Distorted appearance of oocytes was a major
alteration observed. Atretic follicles also increased in number while immature
oocytes decreased. Simultaneously, zinc accumulation was also estimated in the
ovary. Zinc accumulation recorded continuous elevation till the end of the
experiment. Results are linearly proportional to dose and duration of the
experiment. Exposure to zinc can therefore, reduce fecundity of fish thereby
limiting the numerical size of the succeeding generation.
Key words: Zinc, Ootoxicity, Fish.
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