The question declining roach stocks has been a hot topic on Facebook with many passioned points of view, embellished by the wisdom and insight of Trevor Harrop who runs the Avon Roach Project.
The decline of roach
I’m fairly new to social media but when I posted a message saying I felt the major and central answer to the decline on the river Wensum was the presence of cormorants these last decades, my Facebook account went barmy. It is generally agreed that cormorants are a factor but getting rid of them would be no silver bullet, a phrase everyone likes to use these days.
All manner of reasons were put around why our Norfolk rivers, the Wensum principally, doesn’t seem to support big roach anymore. All sorts of solutions were offered, predictably alliance between individuals and statutory bodies, fundraising, projects, monitoring, data collection, meetings, committees, you name it. Pretty much everything but direct action.
One of the comments really struck me, though. It was suggested that roach grow slowly to about six years of age and then catapult forward in growth, largely because they change their diet to snails. Could it be that the Wensum doesn’t hold enough snails anymore to support big, fast-growing roach? I took this on board and was nearly convinced.
Then, I thought of the stretch of Wensum between Elsing and Lyng a few years back. At the time, it was heaving with good roach between a few ounces and a pound and a half. Over a couple of autumns and winters, I also either saw or caught plenty of fish between one pound fourteen ounces and two pounds nine ounces. Obviously, given a chance, the Wensum can still support big roach. The question is, with the amount of cormorants, do those roach ever seriously get the chance to live for 10 years or more. My gut feeling is a big no.
Cormorant population explosion
I’ve also been trying to find out why there has been such a massive increase in the growth of continental cormorants over the past 40 years or so. Their numbers have spiralled from virtually nothing to over one and a half million. Many of those have come to the UK because the continent has not been hospitable enough for them. What on earth caused this amazing increase in the first place?
Sometimes, it just seems so easy. I remember back 10 days or so, on the Island at Kingfisher Lake, when Enoka and dear friend Mick Munns just couldn’t go wrong. You walk off thinking you know all the answers and that you are really king of the lake.
How quickly you can be brought back to earth.