That's a very tricky question, Cybassman. Were goes:
"Do you have any problems with overpopulation of the pumpkinseed, or does the bass manage to control their numbers?" That depends: I'm a biologist and my graduation paper was on freshwater ecology, so I know for a fact that bass need to reach a certain size (over 20/25cm) in order to control the population of any kind of forage fish it encounters, so we here in Portugal face at least two situations: in reservoirs were bass numbers are relatively good, there are very few problems with pumpkinseed density, inspite of rather heavy harvest of small bass, wich means that the amount of larger bass is sufficient to keep them under control in a relative balance. This normaly happens in reservoirs that have poor access from the banks, thus very tough to fish to the majority of portuguese anglers even those that don't respect the law. On the other end, in reservoirs that sustain an intense bass fishing pressure with heavy harvest, the pumpkinseed population is huge and very difficult to control.
"Do you think bass grow bigger and in better quantities in lakes with pumpkinseeds than other lakes?" I honestly can't give you a straight answer, because it's not the only forage available: we also have other species of prey such as the Luisiana crawdad (
Procambarus clarkii) that appears to be favoured in some places. Furthermore, there are those endemic cyprinids that reproduce in the upper portions of the riverine systems and, after spawning, move to upper reaches of the reservoirs and can also be a part of the great equation. I believe that the correct formula for big and healthy bass, at least in Portugal, is an improved control on anglers and the inforcement of the law, habitat improvement and the notion that our native species cannot survive in reservoirs: they're just not fit.
"The reason I'm asking is that we need a good forage fish like the bluegill (or maybe pumpkinseed - I don't know) for the largemouth bass and the fisheries department finds it difficult to import from the USA due to European laws (at least that is their excuse). If a good forage fish that could be used for bass and also for fishing was available in Europe then things would be easier (or the fisheries dept would not have an excuse any more)" That may not be that simple because of Europe's nature conservation laws. In case you didn't know, as we speak, the whole European Union is working on an improved water directive that includes not only physical and chemical paramethers, but also ecological ones, in wich natural occuring fish communities are included. As I believe Cyprus has no natural occuring freshwater fish species, it might not make a great deal of difference but, neverhteless, bass should be considered an "exotic" species, even potencially a pest. So it's tricky...very tricky to try to intoduce another foreign species...One thing that you could do is to find out what is the difficulty in the precess: is it the origin? is it the actual introduction of another species? In the fist case, bass LOVE rainbow trout

...If it's the second case, you could start a hatchery with the already available species, since Cyprus has no natural occuring freshwater species...It 's a very interesting subject and you should find out more with your fisheries department.
Keep'em cominn', Cybassman and, if you or anybody else need more info, PM me, I'll get back asap