Treatment | Yield of commercial clams (kg·m−2) | |||||
Site 1 | Site 2 | Site 3 | Site 4 | Site 5 | Site 6 | |
Z. japonica | 2.2 | 0.7 | 1.0 | 1.2 | 0.5 | 5.1 |
No Z. japonica | 3.9 | 1.3 | 1.5 | 2.6 | 1.2 | 7.6 |
T-test significance | 0.02 | 0.04 | 0.3 | 0.03 | 0.007 | 0.05 |