Two trawlers were spotted around noon last Friday (4 December) dragging a full-sized fishing net between them around the inner harbour.
But Dun Laoghaire's acting harbour master Simon Coate has since confirmed to Afloat.ie that the boats in question were fishing with permission for sprat.
Coate added that the forage fish species comes into the harbour in large numbers on a regular basis at this time of year.
Harbour concerns of a different kind have been heard in Howth, with local TD Tommy Broughan taking the Department of the Marine to task over the lack of any timetable or specific funding for dredging the harbour area - where local yacht club users have found conditions getting worse.
In a post on his website, Deputy Broughan said he was "contacted by members of the Howth Harbour Users Action Group who are very concerned about the build-up of silt in the harbour and the damaging effect this is having on all aspects of this important harbour.
"Howth Harbour has not been dredged for decades. I understand it was last dredged in 1981 or 1982 and I do not recall a dredging programme in the harbour in many years representing the area.
"The action group reports that this neglect has led to almost 6ft of silt building up in the harbour and an operational crisis for all the fishing and leisure craft which use it."
While welcoming investment in infrastructural works at the fishery harbour centre, Deputy Broughan underlines that it is "critical that the harbour does not become unworkable as a result of the build-up of silt".
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