Some fish are radio-tagged, moved above a dam, and tracked to find out if they return to their birthplaces to spawn.
有些在水坝上活动的鱼被安上了无线电标签，可以追踪查看它们是否返回出生地产卵。
Some fish are radio-tagged, moved above a dam, and tracked to find out if they return to their birthplaces to spawn.
有些在水坝上活动的鱼被安上了无线电标签，可以追踪查看它们是否返回出生地产卵。
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