Peringkat perkembangan oosit dalam ovari ikan terubok, hilsa toll (valenciennes).
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Date
1993-12
Authors
Yahya, Khairun
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Abstract
Histology and histochemical techniques were used to
determine the developmental stages of oocytes, the begining
of vitellogenesis and the chemical composition of yolk
inclusions formed.
Oogenesis is commonly divided into two phases. The
first or primary growth phase in H. t;ol.i, involved the
cytoplasmic and nuclear changes during oocyte growth. Three
stages are recognized, namely the chromatin nucleolus, early
and late perinucleolar stages. The second or secondary
growth phase involved the rapid growth of oocyte due to the
accumulation of yolk via a process called vitellogenesis.
Two types of yolks inclusion were formed, "lipid" yolk and
"protein" yolk . During the growth of oocyte, the stages
that have been classified are the lipid yolk stage and
primary, secondary and ~ertiary yolk granule stages.
Histochemical studies, indicated that the chemical
composition of "lipid" yolk consist of phospholipid and
neutral fats. The chemical content of yolk granules
initially consist of lipid and protein during the primary
and secondary yolk granule stages. However, toward the
tertiary yolk granule stage i.e. during the fusion of all
the yolk granule when oocyte is reaching maturity, the
chemical composition is protein and phospholipid.
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Keywords
Perkembangan oosit dalam ovari ikan terubok , Hilsa toll (valenciennes).