disconcerting , for their own good, migration patterns

You're on the right track, translator. Something that is disconcerting upsets you, makes you uncomfortable and a bit puzzled.

The sharks will benefit in the end, because the scientists will know more about them and be able to help them survive.

A migration pattern is the path a migration takes. It might be described in words or shown as arrows on a map. Apparently the sharks travel in a pattern, and with the tracking devices attached to them, the scientists can understand exactly where the sharks go.

Thank you. Very clear.