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Old 15-06-2010, 23:15
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Default How many lbs of fish do Cormorants need to eat per day to survive?

The Somerset levels.

Click the image to open in full size.

A typical roosting pylon on the levels.

How much do they eat per day?
How fast do they breed?
How many are allowed to be culled per year? Two per licence?

This is just one pylon of hundreds!

---------- Post added at 00:15 ---------- Previous post was Yesterday at 23:55 ----------

The light was fading and I couldn't get any more pics, but the cormorants kept coming!

How much do they take?

365 days a year! 25 cormorants in the pic, 2lb each per day? 4lb each per day? I've seen one cormorant take a 5lb chub!

Work it out and work out why our rivers, lakes, ponds, canals are in decline! 365*25*2lb=18250lbs per year!

And that's just one pylon on the Somerset Levels.

R.I.P. Coarse angling!
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Old 16-06-2010, 06:50
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Clipped from an article dated 2002:

"Maths: On average, a cormorant eats a pound of fish each day of it's life - that's about 10,000lbs of fish eaten over it's 25 year life-span, not including the fish it damages but doesn't eat, though those damaged fish may die later.

Two cormorants however do not destroy 20,000lbs of fish. Oh no, that's just the tip of the iceberg. A breeding pair lays a hell of a lot of eggs in 25 years. Each successful hatchling will soon consume it's own daily pound of fish and begin to lay it's own eggs. The damage is compounded with every egg that hatches. Over the span of a cormorant's lifetime, given perfect conditions and assuming that just two birds will successfully hatch each year, shooting a pair of cormorants today will save approx 21,870,302.1818 tons of fish. No, the decimal point is not in the wrong place. Even allowing for a huge degree of leeway, this amount of fish damage is from a starting point of just TWO birds! "
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Old 16-06-2010, 10:10
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Come on Geoff, get a grip.... While I am in total agreement that control measures need implementing the crux of it is few people actually bother to pursue this avenue.
How many licences were actually applied for last year or the years before hand because Cormorants are now officially classified as conservation status least concern and as such do not get the full protection of the law that say otters enjoy.


Just think, if every feral cat bred to its maximum potential, they'd produce 150 kittens per year and if their progeny was to be as equally successful at reproducing, bearing in mind that reach sexual maturity at 3-6 months of age. All can live for upto 10 years; well I'll leave you to do the maths....
Then if you were to compound this with the rabbit, mink, rat and otter populations and they all had maximum breeding success....

Needn't worry about coarse fishing, cos this island will be under the sea. Sunk by the sheer weight of all the verminous predators, eh there's a thought.



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Old 16-06-2010, 10:57
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Yeah get a grip Geoff......one pound of fish per day is ridiculous, a very conservative estimate if you ask me.

But as cg74 says, it's not a problem so we don't need to worry about it.....do we.
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Old 16-06-2010, 11:23
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What about if it was 2lbs of fish per day and each of those fish were all Roach?

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Old 16-06-2010, 11:50
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Then nothing. But if they were salmon...

---------- Post added at 12:50 ---------- Previous post was at 12:41 ----------

Quote:
Originally Posted by cg74 View Post
How many licences were actually applied for last year or the years before hand because Cormorants are now officially classified as conservation status least concern and as such do not get the full protection of the law that say otters enjoy.
Well I don't know anything other than what people tell me. But what they tell me is, there are a lot of paperwork hoops one has to jump through to gain permission to shoot these predators. It takes a lot of time and aggro and after ages and ages a permit finally comes through - to shoot 5 of them in an entire year!
I don't know for certain of course but... this red-tape is most easily dealt with in the time-honoured fashion; so fishery keepers who should have gone to specsavers end up aiming at pigeons and miss. It's a lot easier than applying for pieces of paper. Just a theory of course.
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Old 16-06-2010, 12:06
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Quote:
Originally Posted by Steve Spiller View Post
Yeah get a grip Geoff......one pound of fish per day is ridiculous, a very conservative estimate if you ask me.

But as cg74 says, it's not a problem so we don't need to worry about it.....do we.
Steve if you care to read what my post actually says, rather than your own interpretation of what I wrote. You'll clearly see that I am in fact agreeing with the need for control of Cormorant numbers.
Though the cynicism I display is purely as a result of to many moaners and to few doers.
Within current legislation Cormorants are controllable and do not have conservation status as otters.

Sorry Steve you need to take your concerns up with the controlling body and land owner of the affected water and they then need to go to DEFRA and the EA, simple really, I'd say....

I should go on to point out that for high levels of breeding success it is essential for any/all species to have optimal conditions, to their criteria, do you think our inland waters offer such conditions?
(plus these optimal conditions need to be maintained for the full 25 years of the intial breeding pairs life span, as I said, "get a grip")
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Old 16-06-2010, 12:12
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You are of course correct cg. But never let a shortage of facts get in the way of a good scare-story is what they teach in reporters-acadamy these days. Or so it seems to me.

I remember once reading that if we didn't have ants we would be knee deep in greenfly!
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Old 16-06-2010, 12:17
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Quote:
Originally Posted by geoffmaynard View Post
I don't know for certain of course but... this red-tape is most easily dealt with in the time-honoured fashion; so fishery keepers who should have gone to specsavers end up aiming at pigeons and miss. It's a lot easier than applying for pieces of paper. Just a theory of course.
Your therory is in this case a very accurate one, though usually said holder of the gun fires a shot over the head of the Cormorant and sadly he predicts the birds flight path incorrectly and shame on him he hits said bird....

Using a gun shot as a deterrent for Cormorants is of course fully legal and as I stated earlier if shot by innocent mistake no law is broken, because the level of protection afforded to Cormorants is greatly reduced from that of otters.
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Old 16-06-2010, 12:19
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So why would any fishery keeper apply for these time consuming pieces of paper when they can just reload?

And that's why so few applications are made. You answer your own question!
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