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Top ⇑Definitions

Mature Oocyte

Un-ovulated, cream to yellow, yolk opaque to sometimes slightly translucent, chorion not separated from yolk mass. Found in follicles of MA females.

Ripening Oocyte

Un-ovulated, yellow to amber, yolk becoming translucent to transparent, chorion slightly to moderately separated from yolk mass. Found in follicles of MR females.

Ripe Egg

Ovulated, yellow to amber, yolk translucent to transparent, chorion moderately to usually well separated from yolk mass. Found in lumens (central cavities) in ovaries of RE females. May appear to be concentrated in the posterior portion of the ovaries.

Top ⇑Table 1

Stages of ovarian condition in adult darters based upon Heins and Rabito (1986), Heins and Baker (1989), and Heins et al. (1992).


Stage Description of Ovaries
Latent (LA) Ovaries very small, thin, and transparent to slightly translucent. Maturing oocytes, if present, yolkless or vitellogenic with nucleus visible.
Early Maturing (EM) Ovaries small to moderate in size and translucent to white (opaque). Maturing oocytes small to moderate size and translucent to white with nuclei obscured by yolk.
Late Maturing (LM) Ovaries small to greatly enlarged and white to cream. Maturing oocytes moderate to large size and white to cream.
Mature (MA) Ovaries moderate sized to greatly enlarged and cream to yellow. Two separate groups of follicular oocytes: a group of smaller, maturing oocytes, and a group of larger, mature oocytes which are opaque (usually) and cream to yellow without chorions separated from the yolk.
Ripening (MR) Ovaries moderate sized to greatly enlarged and cream to yellow. Two distinct groups of follicular oocytes. The larger, ripening oocytes are translucent (most often) to transparent with chorions separated from the yolk.
Ripe (RE) Ovaries moderate sized to greatly enlarged and cream to yellow. One group of maturing follicular oocytes, which are moderate to large sized and white to cream. Ripe ova concentrated in the lumen of the ovary (usually posterior) and translucent to transparent (usually) with chorions separated from the yolk.

     © Copyright 1995 by David C. Heins, All rights reserved.

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