The Environment Agency is patrolling the River Severn to watch out for elver poachers.
They're using boats with special imaging equipment so they can see in the dark. Other officers patrol the banks.
The baby eels are a delicacy in the Far East and can command a high price, but fishing is strictly controlled. Anyone doing it without a permit can be prosecuted.
Bill Burleigh is an Environment Agency Fisheries Officer:
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The cloud takes total control during tonight. For most its a dry night. A lot of cloud but also some sunshine at times.
We may have seen the last of the very cold nights. Moving into a milder regime tonight. Thats reflected across the weekend.