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Population sex ratios of adult zebrafish exposed as embryos to 4 h of normoxia (control), hypoxia (5% DO) or anoxia (less than 5% DO). (Asterisk (*) indicates significantly different from an expected χ2 value of 50% (p < 0.05).)
| embryonic stage when treated (hpf) | control |
hypoxia |
anoxia |
|||
|---|---|---|---|---|---|---|
| male (%) | female (%) | male (%) | female (%) | male (%) | female (%) | |
| 18 (N = 140) | 47 | 53 | 50 | 50 | 44 | 56 |
| 24 (N = 133) | 47 | 53 | 73* | 27* | 55 | 45 |
| 36 (N = 133) | 41 | 59 | 61 | 39 | 71* | 29* |
