大神帮忙翻译一下这句话

we didn't expect to have salmon, in some cases, changing the vertical position of a river channel up to 30 percent more than it would have without salmon in it.
这句话是翻译成：我们没有想过有鲑鱼，河道的垂直距离会比没有鲑鱼多改变30%左右。
还是翻译成：与没有鲑鱼的河道相比，我们没有想过鲑鱼会将河道的垂直距离改变30%左右。