This is problem i have big mouth bass but i dont have bluegill but have pumkinseeds sunfish,can i use them instead.and would bigmouth bass eat black bullhead(and can they co exists with red fin perch and carp)

And can i use red fin perch instead of yellow perch

A bass, like all fish, will eat just about anything that will fit in its mouth.

Do bass eat young carp

Bass will eat anything that it can get in its mouth. But, the target fish needs to be between 1/4 to 1/3 the bass's size. It's a matter of energy expended vs calories obtained.

So it could work but how many i lmb can i stock in 15x6 x 3 meters pond

My math could easily be wrong but I BELIEVE you have about 1/2 acre. Is that right?

What is your climate and water temps? I know very little about your area.

I'm doing the math a little different. I'm understanding the pond is 15 x 6 meters and 3 meters deep. That makes the pond a little less than 1000 square feet surface area or about 1/43 acre??? If that is correct, then IMHO you can have 2 or 3 LMB.

Thanks Bill, I figured I was doing something wrong on my conversion from meters to sq ft.

Thank you for replies and for temperature it goes from 10 to 20 - 21 celsius it has hot summers not very cold winters and medium autums and springs

But can i use black bullhead catfish and pumkinseed sunfish imstead of bluegill as forage(and put gravel on bottom so bullheads cant muddy the water) and put red fin perch instead of yellow perch and most importantly to put some common carps into mix (i like their meat)and i will throw out fish every time it is over populated

I cant get lmb but i can get northern pike,wels catfish,zander (european version of welleye) and red fin perch that grows the size of lmb.so my questions is do any of this fish eat following species pumkinseed sunfish,brown/black bullhead catfish and small common carp.

IMO all the predators you mentioned will eat the forage you mentioned if appropriately sized for their mouth gap. I suspect, given such a small BOW, the problem you will have is having self sustaining forage to support your predators. I would be prepared to stock additional forage periodically to keep the predators fed.