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Table 1 Oocyte development stages of forkbeard, Phycis phycis

From: Reproductive strategy of forkbeard, Phycis phycis, from the Portuguese coast

Oocyte development stage Description Diameter (μm)
Primary growth (PG) Polyhedral with a large nucleus, where several nucleoli can easily be observed 22.1–94.7 (59.0 ± 14.8)
Cortical alveolar (CA) Cortical alveoli and lipids appear in the cytoplasm 94.16–191.5 (113.7 ± 14.0)
Primary vitellogenic (Vtg1) Appearance of small granules of yolk around the nucleus 119.4–247.1 (160.3 ± 22.3)
Secondary vitellogenic (Vtg2) Larger yolk globules throughout the cytoplasm 183.1–283.3 (219.2 ± 20.8)
Tertiary vitellogenic (Vtg3) Large yolk globules fill the cytoplasm; oil droplets surround the nucleus 243.3–402.0 (331.0 ± 34.6)
Germinal vesicle migration (GVM) Germinal vesicle migrates to animal pole 372.3–526.2 (435.1 ± 35.9)
Germinal vesicle breakdown and yolk coalescence (GVBD & YC) Germinal vesicle membrane breaks down; yolk globules become hydrated 416.4–637.0 (510.8 ± 56.2)
Hydrated (H) Homogeneous appearance; oocytes ready to be released 544.0–802.3 (639.0 ± 44.5)
  1. A brief description of each oocyte stage, its range size, and mean and standard deviation (in brackets) are given