Invasion Ecology of Freshwater Fish Species

Invasion ecology of freshwater fish examines how non-native species enter, establish and proliferate in novel aquatic habitats, often with profound consequences for native biodiversity, ecosystem functioning and human livelihoods. Key stages in this process include transport (frequently via ballast water, aquaculture escapes or ornamental trade), introduction, establishment and spread. Successful invaders often exhibit high reproductive output, broad environmental tolerances and generalist feeding habits, allowing them to exploit unoccupied niches or outcompete indigenous fauna. Interactions such as intraguild predation, competition for resources and the transmission of novel pathogens further disrupt native communities. Climate change and anthropogenic habitat alteration can facilitate invasions by creating novel or degraded environments to which invaders are pre-adapted. The impacts of freshwater fish invasions extend beyond ecological disruption to include economic costs for fisheries, water treatment and restoration efforts. Contemporary research employs predictive models, stable isotope analyses and network theory to forecast invasion risk, unravel trophic consequences and guide management strategies. Integrated approaches—combining early detection, rapid response, biological control and public engagement—are essential to mitigate the global threat posed by invasive freshwater fishes.

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Invasion Ecology of Freshwater Fish Species publication trend

The graph below shows the total number of articles in invasion ecology of freshwater fish species across all publications each year (not limited to Nature Index journals).

Technical terms

Invasion vector: The pathway by which a non-native species is transported into a new environment.

Propagule pressure: The quantity, frequency and genetic diversity of individuals introduced to a novel habitat.

Intraguild predation: Predatory interaction in which a species consumes another that occupies a similar trophic level.

Ecological niche: The range of environmental conditions and resources a species requires to survive and reproduce.

Trophic network: A representation of feeding relationships within an ecosystem, linking producers, consumers and predators.

Isotopic niche: An organism’s position in isotopic space, reflecting its trophic interactions and resource use over time.

Biotic resistance: The capacity of native communities to limit invasion through predation, competition or disease.

References

1. Intraguild predation as a potential explanation for the population decline of the threatened native fish, the European mudminnow (Umbra krameri Walbaum, 1792) by the invasive Amur sleeper (Perccottus glenii Dybowski, 1877). NeoBiota (2023).
2. Generalist invasion in a complex lake food web. Conservation Science and Practice (2023).
3. Niche partitioning of invasive Amur sleeper (Perccottus glenii) amongst native fish communities in three different freshwater ecosystems. NeoBiota (2024).