鱼群在前往上游产卵的途中被捕获。
Fishes are caught when they are on the way upstream to lay eggs.
整个州都有生物学家在成年鱼出来产卵的时候持续监测着它们。
There are biologists throughout the state constantly monitoring adult fish as they show up to spawn.
清除淤泥，发现鱼类产卵的砾石层，找到合适的鲑鱼种类来重建种群是一项艰巨的任务。
Removing the mud, uncovering gravel beds where fish spawn, and finding suitable salmon types to rebuild the population is a daunting task.
应用推荐