Tagging fish is a normal part of studying them. The tags generally used are small acoustic tags, that emit a distinct sound (sound is the easiest thing to transmit underwater). Fish can't hear the tags, so it doesn't affect...
...oh dear...
...oops...
It turns out that while fish can't hear the sound, seals can. And not being stupid, the seals have worked out that that little beep beep beep means "dinner." And if seals can hear them then whales and dolphins probably can too.
We might need to come up with another way to tag fish.
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