Abstract
Pumpkinseed (Lepomis gibbosus L. 1758) represents an allochthonous (introduced) fish species in freshwater ecosystems of Europe. It has shown good adaptation to existing ecological conditions in the back and low flow rate waters. The analysis of some ecological characteristics of the samples, taken from the reservoir Strezevo in R. Macedonia, points to extremely good growth rate in this ecosystem. Despite markedly expressed fluctuations in the number of its population, pumpkinseed has occupied a corresponding ecological niche in the littoral part of habitat. However, due to a wide trophic spectrum and the possible competition for space and places for reproduction, pumpkinseed has become overabundant, thereby deteriorating the ichthyofauna and state in reservoir Strezevo.
Highlights
Fresh-water ichthyofauna is a dynamic component of aquatic ecosystems
For age determination were used squamas taken under dorsal fin and measurements of ventrolateral radius
The reconstruction of growth pace in previous period was calculated by logarithm function: log L = log a + b log S, where L is total length, S is squama's size, a and b are calculated parameters (Cugunova,1959)
Summary
Fresh-water ichthyofauna is a dynamic component of aquatic ecosystems. In recent decades there were dramatic changes in qualitative and quantitative compound in fish stocks in waters in R. That is as a result of fish which are not permanent inhabitants in our waters. One of these kinds of fish is pumpkinseed (Lepomis gibbosus). It is an introduced kind which has naturalized a lot in the extended areas and is a serious problem for autochthonous ichthyofauna. It can be seen in its predator affinities, because for its nutrition it consumes roe and youth of other kinds. Already existing predators do not consume pumpkinseed as their prey, so it has excellent conditions to survive, but to become over-abundant in newly conquered waters
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