Random fact

[Fishfinder1973]

Wild fish of the cyprinid family like roach,Rudd and bream can often be seen rolling on the water surface taking in air.
They do this to help aid buoyancy so they can feed higher up in the water column comfortably.They will also expel air when they want to go down to the lake bed to feed comfortably.This act of rolling on the surface is called “topping”.

 

[Sgooosh]

Wild fish of the cyprinid family like roach,Rudd and bream can often be seen rolling on the water surface taking in air.
They do this to help aid buoyancy so they can feed higher up in the water column comfortably.They will also expel air when they want to go down to the lake bed to feed comfortably.This act of rolling on the surface is called “topping”.

coool, anyvideos?

 

[Fishfinder1973]

I will certainly try to get a video,but it might take time.
Summer is when the insects emerge.They live as nymphs on the bottom in the rocks and silt,but will make their way to the surface where they will hatch out as flies,and this is when the fish will want to feed close to the surface.They want to intercept the nymphs as they rise in the water.
Cyprinid species use their swim bladders just like a submarine uses a ballast tank,using air to aid buoyancy.
These fish will take in an amount of air depending on how high up in the water is the best depth to intercept the nymphs.
There is also a phenomenon called a thermocline.A thermocline is a layer of water that is warmer than the water above it and below it.Every pond,lake,even the sea has the thermocline.During winter,fish will live in the thermocline layer,which is usually close to the surface,sometimes only 3ft below the surface.The thermocline is only a thin layer,maybe 4 or 5ft thick.
in winter,fish will top like crazy just before dark because they will want to swim in the thermocline,obviously because it’s the warmest layer.
100ft of water and all the fish are sitting 3ft below the surface,