Open Access
Table 1
Age composition of P. bonelli from the River Aggia expressed as the number (N) and percentage (%) of males and females in each age-class. Deviations from unity in the sex ratios (males:females, M:F) were tested by chi-square test (X2); values of p< 0.05 were considered significant.
| Males | Females | ||||||
|---|---|---|---|---|---|---|---|
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| Age class | N | % | N | % | M:F | X 2 | p |
| 1 + | 59 | 522% | 54 | 478% | 1.09:1 | 0.081 | 0.776 |
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| 2 + | 91 | 50.3% | 90 | 49.7% | 1.01:1 | 0.006 | 0.941 |
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| 3 + | 43 | 87.8% | 6 | 12.2% | 7.17:1 | 27.939 | <0.01 |
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| 4 + | 34 | 94.4% | 2 | 5.6% | 17.0:1 | 28.444 | <0.01 |
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| Total | 227 | 59.9% | 152 | 40.1% | 1.49:1 | 14.842 | <0.01 |
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