| The area where it is distributing differs in Amago from Yamame. (In other words it is a river. ) However, the environment of the river where is inhabiting and point are same. |

| There is the place which there is not a high mountainous region in the area where she is distributing.. Accordingly, there is the river that Iwana is not inhabiting. Upstream does not exist from her. |
| Are you seen the vermilion point of the side of body? This is the sole difference with Yamame. ( Takaharagawa Riv. May,1999 ) |
| She grew up with the lake. The parr mark is transparent and seen by the adjustment of light. ( Lake Matsukawako March, 1999 ) |
