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Tuesday, January 30 • 11:40am - 12:00pm
ASIAN CARP & OTHER AQUATIC INVASIVES: Spatiotemporal Patterns from Electrofishing Catches at Lake Michigan Invasive Species Hotspot Locations

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AUTHORS. Matt Petasek, Tony Rieth, Cari-Ann Hayer - U.S. Fish & Wildlife Service; Jacob Richter

ABSTRACT. Appropriate sampling designs are critical to informative data collection and scientifically sound decision making. While many sampling characteristics (e.g., gear type, location, sample size, etc.) should be considered, the sampling timeframe(s) efforts can have large effects on collected data. Temporal fluctuations in near shore fish assemblages can occur due to changes in fish behavior, biology and physiology and are influenced by a multitude of factors (e.g., water temperatures, dissolved oxygen levels, photoperiod, and prey availability). These fluctuations affect fish detection and may ultimately result in biases in the sampling data. Currently, as part of the Aquatic Invasive Species (AIS) sampling regime, electrofishing efforts are performed once a year during a one or two week timeframe at each of five hotspot locations when water temperatures are around 23°C. This short sampling timeframe may not be the most appropriate time period(s) to sample; increased detection and species richness may be gained by sampling during numerous temporal periods. The goal of the project was to design an effective and efficient sampling regime for AIS electrofishing efforts. Our objective was to determine the most effective sampling periods to maximize the number of fish species detected in Lake Michigan. In 2017, we sampled in spring, summer and fall to incorporate a range of temperatures and potential seasonal variability. Spring sampling resulted in the collection of 4,890 fish from 52 species.  We intend to compare and analyze these data with the data collected from replicate sampling events in the summer and fall seasons to relationships and describe changes in fish communities as they relate to spatiotemporal patterns. The purpose of the AIS program is to detect non-indigenous species early before they spread; the goal of this study is to determine if additional species can be detected at different spatial and temporal scales.

Tuesday January 30, 2018 11:40am - 12:00pm CST