Rivers and fish in the Test Valley are under threat, according to the police.

Hampshire Constabulary, which says it has seen an increase in fish poaching and "other related incidents", warns people are not aware of the consequences.

Fish poaching occurs when wild fish are taken from a river section with private fishing rights and the theft of a fish happens when it is stolen from a privately stocked or owned body of water.

Operation Traverse: Police are on the hunt for fish poachers (Image: Hampshire Police) The force, which noted it had responded to an incident involving three men in Wherwell on April 7, said in a Facebook post: "We are working with the River Keepers and the Environment Agency on Operation Traverse.

"We are looking to educate and, where needed, prosecute those who are illegally fishing. Offenders often don't understand or don't care about the effects they have on those who work in this industry or on the environmental effects to wild fish stocks when illegal fishing methods are used.

"There are lots of places where you can legally enjoy fishing and we want you to. Please ensure that you have researched where you are fishing and that you are allowed to fish there and have permission.

"Make sure you know if there are any national or local bylaws and ensure you have a Rod licence.

"You must have a rod licence if you're fishing for salmon, trout, freshwater fish, smelt or eel with a rod and line. This includes if you are fishing on private land, such as an angling club or private fishing lakes. Children under 13 don't need a licence.

"If you are found fishing without a valid licence you could face a fine of up to £2500."