L065 - Plutarch -- Lives III: Pericles and Fabius Maximus. Nicias and Crassus
Distribution of the swimbladder parasite Anguillicola crassus in American eels in the Northeastern...
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Transcript of Distribution of the swimbladder parasite Anguillicola crassus in American eels in the Northeastern...
![Page 1: Distribution of the swimbladder parasite Anguillicola crassus in American eels in the Northeastern Atlantic University of Massachusetts Dartmouth Department.](https://reader030.fdocuments.in/reader030/viewer/2022032709/56649ec95503460f94bd676e/html5/thumbnails/1.jpg)
Distribution of the swimbladder parasite Anguillicola crassus in
American eels in the Northeastern Atlantic
University of Massachusetts Dartmouth
Department of Biology
Amy Aieta&
Kenneth Oliveira
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Life History of Anguilla rostrata
Silver phase
EggLeptocephalus larvae
Glass eel/Elver
Yellow phase
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L2 Released
Intermediate Host
L2 molts to L3
Intermediate/Paratenic Host
Ingested by Eel
L3-L4 swimbladder wall L4-L5 swimbladder lumen
The life cycle of Anguillicola crassus
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Biogeography of Anguillicola crassus
•Identified in Southeast Asia 1974 •(Anguilla japonica)
•Early 1980s introduced to Europe •(Anguilla anguilla)
•1995 found in North America• (Anguilla rostrata)
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Occurrence of A. crassus in North America
1995 Texas (TPWD; Moravec)
South Carolina (Fries et al. 1996)
Chesapeake Bay (Barse and Secor 1999; Barse et al. 2001)
Hudson River (Barse and Secor 1999)
2003 N. Dartmouth, MA
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Objectives
1) Determine northern extent of parasite range in USA
2) Examine prevalence & intensity within NE
3) Examine effects of parasite/eel interactions
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MethodsNortheastern Distribution
Yellow eels *
•Summer 2005
Southern Sampling Survey
•CT, RI, S.-MA
Northern Sampling
•N.-Ma, NH, ME
n=13
n=10
n=3
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Collection of Yellow Eels in Freshwater
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Collection of Silver Eels
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• Eels euthanized w/Clove oil
• Weighed/length measured
• Parasites counted
• Parasite length measured
Preliminary Analysis
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Analysis
Prevalence Example 30%
infected
Mean Intensity1.67 parasites
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Results
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69%
35%
28%
Prevalence of Infection: Rhode Island
N. KINGSTON
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7%
33%62%
76%
16%
52%21%
58%64%33%
Prevalence of Infection: Massachusetts
NEW BEDFORD
PLYMOUTH
BOSTON
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0%31%0%
0%0%0%
Prevalence of Infection: Maine
BANGOR
PORTLAND
0%
26%
35%60%
58%65%
53%
Kennebec RiverEstuarine eels
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n = 315
Eel Size Class (cm)
<10
10.1
-15.
1
15.2
-20.
2
20.3
-25.
3
25.4
-30.
4
30.5
-35.
5
35.6
-40.
6
>40.
6
Mea
n P
aras
ite
Inte
nsi
ty
0
2
4
6
8
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Log 10 Eel Length
1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0
Lo
g 1
0 E
el W
eig
ht
-2
-1
0
1
2
3
4Nonparasitized r2 = 0.99 (n = 523)
Parasitized r2 = 0.98 (n = 315)
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Silver Eel Data: Paskamansett River
Year Prevalence Mean Intensity2003 28% 2.9
2004* 52% 5.8
2005 ? ?
SignificancePrevalence: Fischer's Exact Test p = .008
Intensity: T-test p = .007
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Conclusions
Current Northern Limit
• Sedgeunkedunk Stream, ME • 44°45.306N, tributary of the Penobscot River
• No latitudinal trend• Possible ballast water introduction
• Temperature: not an apparent limiting factor
Influences of Parasite
• All size classes infected• No apparent detrimental effects on eel weight/length• Suspected negative impact on migrating silver eels
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Questions/Discussion