The mean concentrations of the antioxidants (GSH-Px) and oxidants (MDA) in the hepatopancreas, gonad
and muscle tissues of A.
A small minority of the remaining 600 valid histological specimens were bisexual juveniles with vestigial gonads
containing chromatin nucleolar oogonia, undeveloped spermatic tissue, or both (Fig.
In this study, the presence of spermatozoids in all months of the year was observed in most of male gonads
and concerning the immature individuals, these were not observed in either female or male.
Only one study has been published on the effect of Cd on fetal gonads
(Tarn and Liu 1985).
appear along the medial face of each mesonephros.
Children may receive many radiographs with avoidable excess radiation to the gonads
resulting from the inadequate positioning or complete omission of gonadal shields.
In the other 3 patients, the biopsy of one of the gonads
was not suitable for histologic analysis.
Electron Microscopy of Diploid and Tetraploid Gonads
Fish Biology--Particularly for female fish, a large proportion of seasonal weight fluctuations can be attributed to gains and losses in gonad
At 130 dph, 100 fish from each group were randomly selected for histological examination of the gonads
, each concentration group was set with three replicates.
The structure of the gonads
was examined under a light microscope to determine the sex, the gonad
development stage of each individual, and the presence of parasites.
The aim of the study were to investigate the presence of heavy metal contaminants like Lead (Pb), Cadmium (Cd) and Nickel (Ni) in three commonly consumed fish, determine the concentration of bio-accumulated HMs in liver, gill, kidney, gonad
and muscle of fish and find out whether the studied fish have elevated concentrations of HMs in their tissues that could render them dangerous for human consumption, by comparing with the maximum permissible limits proposed by FAO and WHO.