Asian Carp Response in the Midwest
Asian Carp Sampling Summary - Week of May 16, 2011
A sampling summary for the week of May 16, 2011 is included below. Note that these data are field summaries that are provisional and subject to revision pending thorough review.
Bottom Line: No Asian carp were captured or observed upstream of the Dispersal Barrier nor were any found in new locations downstream of the Barrier.
Fixed Site Sampling Upstream of the Dispersal Barrier
Site 1: Lake Calumet
Site 2: Little Calumet River
Site 3: Chicago Sanitary and Ship Canal (CSSC), South Branch Chicago River
Site 4: North Branch Chicago River, North Shore Channel
Site 5: North Shore Channel
One boat and crew from USFWS – Columbia sampled the five fixed sites above the Dispersal Barrier on Tuesday -Thursday, May 17-19. This completed fixed site sampling initiated the previous week. Sample effort included a total of 50 electrofishing runs (15 minutes each; 12.5 hours total). A combined total of 1,563 fish representing 25 species were sampled during the effort. No Asian carp were captured or seen.
A catch summary is listed below.
|Species||Site 1||Site 2||Site 3||Site 4||Site 5||All sites|
|Gizzard shad >6.0 in.||80||89||6||32||207|
|Gizzard shad <6.0 in.||39||257||66||115||477|
eDNA Monitoring Project
One IDNR boat and crew obtained 120 water samples for eDNA analysis from the North Shore Channel on Monday, May 16. Samples were filtered at the USEPA lab in Chicago and forwarded to ERDC in Vicksburg, MS for analysis. Results of eDNA analysis will be reported on the USACE web site listed below as they become available.
Barrier Defense Asian Carp Removal Project
Dresden Island Pool: 10-24 miles downstream from Dispersal Barrier
Marseilles Pool: 24-51 miles downstream from Dispersal Barrier
Starved Rock Pool: 51-65 miles downstream from Dispersal Barrier
Five commercial fishing boats and crews and five IDNR observers fished a combined 30,100 yards of net from Tuesday-Friday, May 17-20. Netting effort focused on backwater areas of Marseilles Pool near Morris (25,300 yards of net), but also took place in lower Dresden Island Pool (1,600 yards of net) and Starved Rock Pool (3,200 yards of net). A total of 1,604 bighead carp and 1,602 silver carp were removed during the effort. The combined harvest for both species was 63,608 pounds and 60% of this total was taken from the Marseilles Pool. A cumulative removal summary for all locations combined is included below.
|Number of Days Fished||12||days|
|Number of Net Crews||60||crew-days|
|Miles of Nets Fished||51.8||miles|
|Number of Bighead Carp||6,521||fish|
|Number of Silver Carp||3,336||fish|
|Number of Grass Carp||5||fish|
|Number of Asian Carp (AC)||9,862||fish|
|Tons of AC Harvested||103.4||tons|
|Average number AC per 1,000 yards net||108.2||fish|
Gear Evaluation Study
One INHS boat and crew sampled with multiple gears at Treadway and Lilly lakes in the LaGrange Pool (river mile 80.2-157.6; Dispersal Barrier is at mile 296.1) of the Illinois River from Monday – Friday, May 16-20, 2011. Twelve types of gear were evaluated at each location. A combined total of 353 fish representing 34 species and 2 hybrid groups were sampled, including 65 Asian carp. Of the Asian carp, 33 were silvers, 22 were bigheads, 6 were obvious bighead x silver carp hybrids, and 4 were grass carp.
A summary of sampling effort for each site and a catch summary for all gears combined is listed below.
|DC electrofishing||6 x 15-min. runs|
|Trammel net w/ pounding||4 sets|
|Small mesh gill net -sinking||4 x 4-hr. sets|
|Small mesh gill net -floating||4 x 4-hr. sets|
|Large mesh gill net -sinking||4 x 4-hr. sets|
|Small mesh hoop net||8 net-nights|
|Large mesh hoop net||8 net-nights|
|Trap net||8 net-nights|
|Mini fyke net||8 net-nights|
|Small mesh purse seine||4 hauls|
|Large mesh purse seine||4 hauls|
|Hydroacoustics||30 min. run|
|Bighead X Silver carp hybrid||6||6|
|White bass X Striped bass hybrid||1||1|