An angler has been fined £750 after becoming aggressive towards a fisheries enforcement officer.
Richard Sykes, 39, of Hopewell Road in Hull was sentenced at Beverley Magistrates' Court on Friday.
He was found guilty of a public order offence and admitted to a separate charge of leaving his fishing rods unattended.
As well as the fine, Sykes was ordered to pay £730.54 costs and a £15 victim surcharge.
The offences happened in August 2012 at Oakland Waters in Gowdall near Snaith, where a bailiff found three rods unattended with lines in the water.
Leaving fishing rods like this is an offence under Environment Agency bylaws, because fish can swallow the hook and suffer internal damage or death.
When Sykes later returned from a nearby cafe, he was asked to show his licence and at first refused.
He then became abusive towards the enforcement officer.
Peter Mischenko, fisheries technical officer at the Environment Agency, said: "Policing of our rivers is vital to stamp out illegal fishing activities.
"Illegal fishing can, potentially, harm fish stocks and damage the environment."