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Characterizing lentic freshwater fish assemblages using multiple sampling methods.

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Characterizing fish in lakes requires multiple sampling methods and seasons. Optimal gear combinations, like fall electrofishing and summer netting, capture most species, simplifying lentic fish assemblage assessment.

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Area of Science:

  • Ecology
  • Fisheries Science
  • Aquatic Biology

Background:

  • Assessing fish assemblages in lentic ecosystems is challenging.
  • Existing research often focuses on recreationally important species, neglecting entire fish communities.
  • The impact of multiple sampling methods and temporal variation on fish assemblage characterization is understudied.

Purpose of the Study:

  • To evaluate the combined influence of sampling methods and timing on fish species richness and abundance in lentic ecosystems.
  • To identify optimal gear types and seasons for comprehensive fish assemblage sampling.
  • To determine if waterbody type (lake vs. impoundment) affects sampling outcomes.

Main Methods:

  • Six lakes and impoundments (48-1,557 ha) were sampled seasonally.
  • Seven different gear types were employed across all sampling events.
  • Species detection probabilities and assemblage composition were analyzed based on gear and season.

Main Results:

  • Species detection probabilities showed strong gear selectivities and seasonal trends.
  • Over 90% of all encountered species were captured using a combination of fall boat electrofishing and summer benthic trawling/fyke netting.
  • Sampling effectiveness was influenced by gear and season, but not by waterbody type (lake or impoundment).

Conclusions:

  • A limited number of well-chosen gears used in optimal seasons can effectively characterize lentic fish assemblages.
  • Standardizing data collection across multiple methods and seasons is crucial for reliable monitoring and decision-making in lentic ecosystems.
  • The findings provide practical guidance for efficient and accurate fish assemblage assessment in lakes and reservoirs.