Measurements were carried out on oocytes that belonged to any of the maturation stages, yet only oocytes with a well-defined nucleus were considered for measurements in the late vitellogenic
stage (LVt) and partially spawned (SP) stages.
those with vitellogenic
follicles), and oocytes and eggs from ripe (RE) females (i.
The minimum size at maturity corresponded to the size class in which at least 50% of the females contained embryos or vitellogenic
follicles (Reznick and Endler, 1982; Johnson and Belk, 2001).
Diversity of metazoan ovaries and vitellogenic
mechanisms-implications for life history theory.
Our data show that vitellogenic
oocytes between 300 and 350 pm do not undergo OM and, therefore, represent several potential batches.
uniformis (Table 2): (1) Quiescent, no vitellogenic
granules are noted in the ooplasm; (2) Early yolk deposition, basophilic yolk granules in the ooplasm; (3) Enlarged ovarian pre-ovulatory follicles (> 5 mm); (4) Oviductal eggs.
191] studied the inhibition of apoptosis in vitellogenic
ovarian follicles of rainbow trout (Oncorhynchus mykiss) by various factors and reported no apparent affect of IGFs.
Females were considered juveniles if they presented small, undeveloped ovaries and undifferentiated uteri, whereas adults showed well-developed ovaries containing large vitellogenic
oocytes and fertilized eggs or embryos in the uteri.
peruvianus female from May (154389) contained corpora lutea from a previous clutch and concomitant vitellogenic
follicles for a subsequent clutch indicating M.
2]-injected juvenile and vitellogenic
female longear sunfish.
gt; 130km) from shore developed hydrated eggs, but the majority of other dolphinfish ovaries were undeveloped or appeared to be reabsorbing the vitellogenic
oocytes before they had reached maturity.
ULTRASOUND IMAGE ANALYSIS PROVIDES NEW INSIGHT INTO THE VITELLOGENIC
PROCESS OF CONSTRICTOR SNAKES.