Birmingham Anglers Association

Below is a snippet from the Canal and River Trust website.

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Can I return a zander to the canal?

As the law stands, it is illegal to return a zander or any other non-native fish species to the canal network. This is set out in the terms and conditions of our KIFR permits.

You are allowed to take zander, and other fish species classified by DEFRA as non-native, for the pot.
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So the answer to the question by DavidH is YES!