Table 3 Prey fish data of three piscivorous fish in invaded Dongjiang River and the reference Beijiang River
Species | River | Site | Mean no. of prey species (SD) | Mean prey catch rate as grams per net per day (SD) |
|---|---|---|---|---|
Culter fish | Â | Â | Â | Â |
| Â | Dongjiang | Â | Â | Â |
| Â | Â | Hengli | 5.25 (0.46) | 184.00 (63.79) |
| Â | Â | Guzhu | 6.13 (0.64) | 196.75 (65.60) |
| Â | Â | Heyuan | 6.63 (0.52) | 204.88 (48.94) |
| Â | Â | Huangtian | 5.88 (0.64) | 138.00 (50.55) |
| Â | Â | Mean | 5.97 (0.57) | 180.91 (60.82) |
| Â | Beijiang | Â | Â | Â |
| Â | Â | Lubao | 7.00 (0.93) | 317.13 (105.29) |
| Â | Â | Shijiao | 7.00 (1.19) | 302.75 (75.84) |
| Â | Â | Qingyuan | 6.87 (0.83) | 303.50 (65.26) |
| Â | Â | Lianjiang | 6.75 (0.89) | 276.12 (78.25) |
| Â | Â | Mean | 6.91 (0.12) | 299.88 (79.84)* |
Mandarinfish | Â | Â | Â | Â |
| Â | Dongjiang | Â | Â | Â |
| Â | Â | Hengli | 6.63 (0.52) | 243.13 (128.77) |
| Â | Â | Guzhu | 6.50 (0.76) | 175.50 (80.46) |
| Â | Â | Heyuan | 6.13 (0.35) | 229.88 (99.40) |
| Â | Â | Huangtian | 5.25 (0.46) | 213.38 (95.67) |
| Â | Â | Mean | 6.42 (0.26) | 215.47 (100.84) |
| Â | Beijiang | Â | Â | Â |
| Â | Â | Lubao | 7.00 (0.76) | 483.88 (116.46) |
| Â | Â | Shijiao | 7.25 (0.71) | 334.25 (170.95) |
| Â | Â | Qingyuan | 7.13 (0.83) | 315.88 (79.78) |
| Â | Â | Lianjiang | 6.50 (0.53) | 306.88 (125.04) |
| Â | Â | Mean | 6.97 (0.33) | 369.56 (141.87)** |
Catfish | Â | Â | Â | Â |
| Â | Dongjiang | Â | Â | Â |
| Â | Â | Hengli | 4.5 (0.76) | 129.38 (26.65) |
| Â | Â | Guzhu | 5.25 (0.70) | 150.00 (37.99) |
| Â | Â | Heyuan | 4.88 (0.64) | 134.38 (45.34) |
| Â | Â | Huangtian | 4.5 (0.53) | 118.00 (25.42) |
| Â | Â | Mean | 4.78 (0.36) | 132.94 (35.11) |
| Â | Beijiang | Â | Â | Â |
| Â | Â | Lubao | 5.00 (0.76) | 231.38 (95.89) |
| Â | Â | Shijiao | 5.38 (0.92) | 246.12 (55.81) |
| Â | Â | Qingyuan | 4.88 (0.64) | 211.00 (75.08) |
| Â | Â | Lianjiang | 4.25 (0.46) | 221.38 (79.03) |
| Â | Â | Mean | 4.88 (0.47) | 227.47 (75.07)* |