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Table 3 Measurements of B. altianalis oocytes for fish obtained from Upper Victoria Nile; Data are shown as mean ± SD

From: Optimizing selection of sexually mature Barbus altianalis for induced spawning: determination of size at sexual maturity of populations from Lake Edward and Upper Victoria Nile in Uganda

River Nile
No Oocyte type Average cell size (μm) recorded for diameter Nucleus size (μm) recorded for diameter Estimated number of nucleoli for each egg Ratio between oocyte and nuclei sizes Total number of oocytes measured
1 Primary growth oocyte      
Oogonia 13.95 ± 2.97 9.40 ± 1.82 0.64 ± 0.10 168
Chromatin nucleolar 48.85 ± 10.47 21.23 ± 4.36 1.81 ± 1.17 0.44 ± 0.10 175
Perinucleolar oocytes 162 ± 64.82 67.40 ± 36.90 16.84 ± 7.94 0.32 ± 0.13 364
2 Cortical alveolar 330.63 ± 62.75 121.93 ± 28.23 31.40 ± 9.43 0.37 ± 0.76 134
3 Vtg1 oocytes 502.88 ± 114.97 124.04 ± 0.34 28.82 ± 9.23 0.27 ± 0.07 102
4 Vtg2 oocytes 767.40 ± 124.08 154.02 ± 46.16 29.67 ± 12.06 0.21 ± 0.07 96
5 Vtg3 oocytes 1036.60 ± 286.93 160.56 ± 0.042 21.90 ± 9.37 0.15 ± 0.044 82
6 Mature oocytes 1540.05 ± 184.68 204.31 ± 76.34 22.32 ± 15.30 0.135 ± 0.04 80