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Table 2
Monthly variations of sex ratio for female to male (F/M) Toxabramis swinhonis collected in BDT Lake from October 2016 to September 2017 (P-values determined by χ 2-tests).
| Sampling time | Number of specimens | Sex ratio (F/M) | P-values | |||
|---|---|---|---|---|---|---|
|
|
||||||
| Female | Male | |||||
| 2016 | October | 3 | 16 | 0.19 | 0.003 | |
| November | 28 | 8 | 3.50 | <0.001 | ||
| December | 46 | 8 | 5.75 | <0.001 | ||
| 2017 | January | 30 | 28 | 1.07 | 0.792ns | |
| February | 34 | 48 | 0.71 | 0.122ns | ||
| March | 59 | 38 | 1.55 | 0.033 | ||
| April | 39 | 36 | 1.08 | 0.729ns | ||
| May | 22 | 24 | 0.92 | 0.768ns | ||
| June | 11 | 32 | 0.34 | 0.001 | ||
| July | 18 | 94 | 0.19 | <0.001 | ||
| August | 34 | 18 | 1.89 | 0.027 | ||
| September | 44 | 8 | 5.50 | <0.001 | ||
| Total | 368 | 358 | 1.03 | 0.711ns | ||
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