Table 11
Poecilia latipinna. Changes in Gonadotrops Correlated With Ovarian Condition
Gonadotrops
Stage
Oocytes
Size
Nucleus
Nucleolus
Cytoplasm
Amphiphilic granules
1. Previtellogenesis
First phase
Small
Small, dense
Invisible
Granulation absent or Absent
2. Early vitellogenesis Second phase, Medium Larger, ovoid or
Fairly
Granulation variable, None or few
oocytes
chromatin
fine powder
vacuolated
rounded, clear
prominent
granules coarser
with oil
nucleoplasm
than phase 1. Cells
droplets
tend to vacuolate as
they degranulate
3. Midvitellogenesis Second phase, Large
Very large, ovoid or Prominent
Granulation variable, Present, mixed with
accumulating
round, clear
often degranulation.
glycoprotein
proteinaceous
nucleoplasm, thick
Nearly always vacugranules or in
yolk. Granumembrane
olated, some
vacuoles
losa cells
strongly, with
very active,
vacuoles nearly fillmany mitoses
ing cell, especially
marked in Bouinfixed material
4. Late vitellogenesis Full grown,
Large
Very large, ovoid or Extremely
Granulation poor to
Abundant, in cytopacked with
rounded, clear
large
moderate, heavily
plasm and in
yolk
nucleoplasm,
vacuolated, many
vacuoles. (Similar
thick membrane.
vacuoles in Bouinto type 1 goMean nuclear
fixed material so
nadotrop in
area in section,
large as to appear
salmon, illw
17.7 & 0.59 p*
extracellular. Abuntrated by
dant cytoplasmic
Olivereau, 1963b)
RNA, Golgi very
prominent
U