Catching and keeping a tiddler could land anglers with fines.
The government reminded sea anglers this week that size matters when it comes to deciding whether to keep fish they catch.
Bye-laws governing landing sizes apply not only to commercial fishermen but also to recreational anglers, says the Department of Environment, Food and Agriculture.
The Mean Landing Sizes stipulated in the Sea-Fisheries (Technical Measures) Bye-Laws, which were passed in 2000, conserve fish populations by ensuring that enough fish reach the size at which they are able to reproduce.
Mean landing sizes are displayed at harbours and on the recreational fishing page of the Isle of Man Government website, www.gov.im.
Keeping an under-size fish – or a salmon or sea trout of any size caught at sea – is an offence under the Fisheries Act 2012 punishable with a fine of up to £1,000.