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Monday, January 29 • 1:40pm - 2:00pm
ASIAN CARP: Habitat Use and Movement of Juvenile Asian Carp in the Illinois River

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AUTHORS. Cory Anderson, U.S. Fish & Wildlife Service; Kjetil Henderson, U.S. Army Corps of Engineers; Rebecca Neeley, U.S. Fish & Wildlife Service

ABSTRACT. Juvenile silver (Hypopthalmichthys molotrix) and bighead (H. nobilis) carp represent a major threat to breaching the Electric Dispersal Barrier by upstream movement or passive entrainment via barge. While much data exists on habitat use of adult silver and bighead carp, little exists for juveniles, making monitoring and removal efforts difficult. Most efforts targeting juvenile silver carp have focused on backwaters where current sampling gears are most effective. During 2016, 75 juvenile silver carp (mean TL = 246.7mm) were tagged in the Peoria reach of the Illinois River using acoustic tags. Stationary hydrophones were deployed to monitor tagged fish. Large shallow areas of the Peoria reach caused poor detection ability and subsequently little data was gathered. Data from 2016 indicated mean weekly movement of 0.14 to 0.69km. Main channel habitats were used by tagged silver carp 55% of the time, which was higher than expected. In the summer and fall of 2017, both radio and acoustic tags were implanted into juvenile silver carp (n = 150). Stationary hydrophones and radio monitoring stations have been deployed to passively monitor tagged fish, and are supplemented with active monitoring via boat. Water conditions such as river flow velocity, temperature, and depths in each habitat area are being monitored to test for correlations with movement of tagged fish. Preliminary results indicate movement of juvenile carp is much higher than expected as fish are moving in and out of different habitat areas. The results of this study will increase the knowledge and ability to effectively target juvenile Asian carp during sampling efforts. 

Monday January 29, 2018 1:40pm - 2:00pm CST