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Size, age structure and diet preferences of an invasive population of redbreast sunfish (Lepomis auritus) in Richland Creek, Haywood County, North Carolina
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Size, age structure and diet preferences of an invasive population of redbreast sunfish (Lepomis auritus) in Richland Creek, Haywood County, North Carolina
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Size, age structure and diet preferences of an invasive population of redbreast sunfish (Lepomis auritus) in Richland Creek, Haywood County, North Carolina
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Dissertation
Size, age structure and diet preferences of an invasive population of redbreast sunfish (Lepomis auritus) in Richland Creek, Haywood County, North Carolina
2014
Overview
In Richland Creek, Haywood County, North Carolina, the invasive species, Redbreast Sunfish, Lepomis auritus (Linnaeus 1758), dominates the fish assemblage. As part of a study of the feasibility of using backpack electrofishing to selectively remove the invasive, Redbreast Sunfish were removed from three reaches of Richland Creek. The sacrificed fish were used to gain insight into the population characteristics of this population. Data on total length, wet weight and age, were recorded. Stomach contents were identified to the lowest taxon feasible, and compared to standardized invertebrate samples collected near the time of fish sampling. Fish sacrificed ranged from total lengths of 31 mm to 168 mm. Fish were found from zero to three years old, with the majority of fish being in their first or second year of life. The fish collected in sites close to a small reservoir downstream were smaller than fish collected upstream, indicating that the river population was likely a sink population to the reservoir. This population of Redbreast Sunfish ate a variety of invertebrates, as well as a fish, supporting our hypothesis that they, as many invasive species, are generalists. They showed a slight preference for chironomids, and appeared to avoid mayflies.
Publisher
ProQuest Dissertations & Theses
Subject
ISBN
9781321383416, 132138341X
