Winter carp/koi feeding

  • We are currently upgrading MFK. thanks! -neo

Jonathan Robinson

Feeder Fish
MFK Member
Nov 2, 2016
23
10
3
41
Hi all,

New to the forum, though have been reading for some time.

Have a 15ft x 15ft pond I set up in April and we are now going into our first winter. We are just outside Edinburgh in Scotland, so winters are usually mild and deep freezes are extremely rare. It's been 5 years since we've last had 20 degrees F/ minus 7C.

Anyway, it's well planted, relatively shallow (32 inches - bed rock issues) and very well filtered (large pressurised filter, vortex, 750 litre (200 US gallon reed bed) and a couple of 1000 litre (225 US gallon) tanks attached to the system, one of which works quite well as a settlement tank. Anyway, end result is that despite it being soil bottomed, it's very clear. Total system volume is about 11000 litres (2900 gallons).

I have quite a lot of carp in it - mostly mirror and common carp with a handful of koi. About 20 of them, largest 24" and 6 1/2lbs and smallest 8". Average about 12" and 1.5lbs. A few koi, all small and a few random fish such as tench, roach, rudd and a sterlet.

Anyway, due to the weather turning cooler (almost freezing overnight, 8c (47F) through the day) the fish have mostly stopped taking their wheatgerm pellets. They are however readily taking maggots. The contrast is quite stark - they'll mostly ignore the pellets and jump on the maggots almost immediately. I'm keen to continue feeding when possible over winter as the angler in me can't get my head around not feeding them for months.

So, with worms and maggots being in good supply, as well as the usual wheatgerm sticks, how would you approach winter feeding?
 
I stop feeding my koi when the water temperature drops below 50 degrees F (10 Celsius). Usually November - April. Fish stay on the bottom and don't move much. There are two main reasons not to feed. The food may rot in their stomachs since their metabolism has slowed down. Secondly, your beneficial bacteria stops working when the water temperature drops below 50 degrees F. Your fish will be fine not eating for months.
 
Mine have remained really quite active until just very recently. The water has been down below 10c for about 4 weeks now (cold easterly wind meant that the water chilled a little early) and until we had our first frost (night before last, and very gentle frost at that) they were still taking wheatgerm sticks off the surface readily.

I suppose my question is, given that the fish are still consuming maggots so rapidly, would you continue feeding? The water is all the way down at 5c, but they are still fairly active, and as said jump on the maggots quickly.

I have noticed quite stark differences in the feeding of the carp and the koi. The koi have scarcely fed in the last 3-4 weeks whilst the cooler temperatures haven't affected the mirror and common carp as much.
 
As it is, with a few sustained days of 3 celcius nights and 6 celcius days, they've totally stopped feeding. Winter in Scotland is a very inconsistent affair. We've had multiple Christmas' with double digit temperatures (celcius) and others where it has been 5-6 celcius below freezing. No pattern, rhyme or reason really!
 
MonsterFishKeepers.com