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FA-113
Common Freshwater Fish Parasites Pictorial Guide: Nematodes1
Deborah B. Pouder, Eric W. Curtis, and Roy P.E. Yanong2
1. This document is FA-113, one of a series of the Tropical Aquaculture Laboratory, School of Forest Resources and Conservation Program in Fisheries and Aquatic Sciences, UF/IFAS Extension. Original publication date July 2005. Reviewed February 2017. Please visit the EDIS website at http://edis.ifas.ufl.edu.
2. Deborah B. Pouder, coordinator of research programs and services; Eric W. Curtis, former biological scientist; and Roy P.E. Yanong, professor; Tropical Aquaculture Laboratory, School of Forest Resources and Conservation Program in Fisheries and Aquatic Sciences, UF/IFAS Extension, Gainesville, FL 32611.
The Institute of Food and Agricultural Sciences (IFAS) is an Equal Opportunity Institution authorized to provide research, educational information and other services only to individuals and institutions that function with non-discrimination with respect to race, creed, color, religion, age, disability, sex, sexual orientation, marital status, national origin, political opinions or affiliations. For more information on obtaining other UF/IFAS Extension publications, contact your county’s UF/IFAS Extension office.
U.S. Department of Agriculture, UF/IFAS Extension Service, University of Florida, IFAS, Florida A & M University Cooperative Extension Program, and Boards of County Commissioners Cooperating. Nick T. Place, dean for UF/IFAS Extension.
IntroductionThis publication is one in a series of pictorial guides that is designed to assist in the identification of common freshwater fish parasites. The publications included in this series are:
• Common Freshwater Fish Parasites Pictorial Guide: Sessile Ciliates
• Common Freshwater Fish Parasites Pictorial Guide: Motile Ciliates
• Common Freshwater Fish Parasites Pictorial Guide: Dinoflagellates, Coccidia, Microsporidians, & Myxozoans
• Common Freshwater Fish Parasites Pictorial Guide: Monogeneans
• Common Freshwater Fish Parasites Pictorial Guide: Digenean Trematodes
• Common Freshwater Fish Parasites Pictorial Guide: Nematodes
• Common Freshwater Fish Parasites Pictorial Guide: Acanthocephalans, Cestodes, Leeches, & Pentastomes
• Common Freshwater Fish Parasites Pictorial Guide: Crustaceans
The information provided in this guide is not intended to be a complete, detailed description of each parasite or parasite group and its characteristics but rather is intended
to assist in the visual identification of some of the most common species or groups of parasites seen in freshwater fish. For further information on each parasite, refer to publications in the “Recommended Reading” and “Refer-ence” sections below.
Guide Information• Target Tissue: provides the location on/in the fish where
the parasite is most commonly found.
• Characteristic: provides a brief description about the appearance of the parasite.
• Size: provides the size or size range of the parasite. (1 µm = 0.001 mm = 0.0001 cm) (µm = micron or micrometer; mm = millimeter; cm = centimeter)
• Movement: provides the type of movement, if any, of the parasite.
• Note: provides a brief comment of interest about the parasite.
AcknowledgementsThe authors thank Jennifer Matysczak for the photographs she contributed to this publication.
Recommended ReadingSRAC Publication No. 410 Calculating Treatments for Ponds and Tanks. Southern Regional Aquaculture Center.
2Common Freshwater Fish Parasites Pictorial Guide: Nematodes
https://srac.tamu.edu/index.cfm/event/getFactSheet/whichfactsheet/83/
SRAC Publication No. 475 Proliferative Gill Disease (Hamburger Gill Disease). Southern Regional Aqua-culture Center. https://srac.tamu.edu/index.cfm/event/getFactSheet/whichfactsheet/122/
SRAC Publication No. 4701 Protozoan Parasites. Southern Regional Aquaculture Center. https://srac.tamu.edu/index.cfm/event/getFactSheet/whichfactsheet/171/
UF/IFAS Circular 91 Nematode (Roundworm) Infections in Fish. http://edis.ifas.ufl.edu/FA091
UF/IFAS Circular 120 Fish Health Management Consid-erations in Recirculating Aquaculture Systems - Part 1: Introduction and General Principles. http://edis.ifas.ufl.edu/FA099
UF/IFAS Circular 121 Fish Health Management Consid-erations in Recirculating Aquaculture Systems - Part 2: Pathogens. http://edis.ifas.ufl.edu/FA100
UF/IFAS Circular 122 Fish Health Management Con-siderations in Recirculating Aquaculture Systems - Part 3: General Recommendations and Problem Solving Ap-proaches. http://edis.ifas.ufl.edu/FA101
UF/IFAS Circular 716 Introduction to Freshwater Fish Parasites. http://edis.ifas.ufl.edu/FA041
UF/IFAS Circular 919 Stress--It’s Role in Fish Disease. http://edis.ifas.ufl.edu/FA005
UF/IFAS Circular 920 Ichthyophthirius multifiliis (White Spot) Infections in Fish. http://edis.ifas.ufl.edu/FA006
UF/IFAS Circular 921 Introduction to Fish Health Manage-ment. http://edis.ifas.ufl.edu/FA004
UF/IFAS Fact Sheet FA-13 Use of Copper in Freshwater Aquaculture and Farm Ponds. http://edis.ifas.ufl.edu/FA008
UF/IFAS Fact Sheet FA-23 The Use of Potassium Permanga-nate in Fish Ponds. http://edis.ifas.ufl.edu/FA032
UF/IFAS Fact Sheet FA-28 Monogenean Parasites of Fish. http://edis.ifas.ufl.edu/FA033
UF/IFAS Fact Sheet FA-37 Use of Potassium Permanganate to Control External Infections of Ornamental Fish. http://edis.ifas.ufl.edu/FA027
UF/IFAS Fact Sheet FA-55 Submission of Fish for Diagnos-tic Evaluation. http://edis.ifas.ufl.edu/FA055
UF/IFAS Fact Sheet FA-90 Pentastomid Infections in Fish. http://edis.ifas.ufl.edu/FA090
UF/IFAS Fact Sheet FA-107 Common Freshwater Fish Parasites Pictorial Guide: Sessile Ciliates. http://edis.ifas.ufl.edu/FA107
UF/IFAS Fact Sheet FA-108 Common Freshwater Fish Parasites Pictorial Guide: Motile Ciliates. http://edis.ifas.ufl.edu/FA108
UF/IFAS Fact Sheet FA-109 Common Freshwater Fish Parasites Pictorial Guide: Flagellates. http://edis.ifas.ufl.edu/FA109
UF/IFAS Fact Sheet FA-110 Common Freshwater Fish Parasites Pictorial Guide: Dinoflagellates, Coccidia, Micro-sporidians, and Myxozoans. http://edis.ifas.ufl.edu/FA110
UF/IFAS Fact Sheet FA-111 Common Freshwater Fish Parasites Pictorial Guide: Monogeneans. http://edis.ifas.ufl.edu/FA111
UF/IFAS Fact Sheet FA-112 Common Freshwater Fish Parasites Pictorial Guide: Digenean Trematodes. http://edis.ifas.ufl.edu/FA112
UF/IFAS Fact Sheet FA-114 Common Freshwater Fish Parasites Pictorial Guide: Acanthocephalans, Cestodes, Leeches, and Pentastomes. http://edis.ifas.ufl.edu/FA114
UF/IFAS Fact Sheet FA-115 Common Freshwater Fish Parasites Pictorial Guide: Crustaceans. http://edis.ifas.ufl.edu/FA115
UF/IFAS Fact Sheet VM-67 Management of Hexamita in Ornamental Cichlids. http://edis.ifas.ufl.edu/VM053
UF/IFAS Fact Sheet VM-77 Use of Formalin to Control Fish Parasites. http://edis.ifas.ufl.edu/VM061
UF/IFAS Fact Sheet VM-78 Bath Treatment for Sick Fish. http://edis.ifas.ufl.edu/VM037
UF/IFAS Fact Sheet VM-85 “Red Sore Disease” in Game Fish. http://edis.ifas.ufl.edu/VM059
UF/IFAS Fact Sheet VM-86 Use of Salt in Aquaculture. http://edis.ifas.ufl.edu/VM007
3Common Freshwater Fish Parasites Pictorial Guide: Nematodes
UF/IFAS Fact Sheet VM-87 Sanitation Practices for Aqua-culture Facilities. http://edis.ifas.ufl.edu/AE081
UF/IFAS Fact Sheet VM-104 Cryptobia iubilans in Cichlids. http://edis.ifas.ufl.edu/VM077
ReferencesBergmann, G.T. and P.J. Motta. 2004. Infection by anisakid nematodes Contracaecum spp. in the Mayan cichlid fish ‘Cichlasoma (Nandopsis)’ urophthalmus (Günther 1862). Journal of Parasitology 90(2):405-407.
Hoffman, G.L. 1999. Parasites of North American freshwa-ter fishes. Cornell University Press, Ithaca, NY.
Lewbart, G.A. 1998. Self-assessment color review of orna-mental fish. Iowa State University Press, Ames, Iowa.
Longshaw, M. and S.W. Feist. 2001. Parasitic diseases. Pages 167-183 in W.H. Wildgoose, editor. BSAVA manual of ornamental fish, second edition. British Small Animal Veterinary Association, Gloucester, England.
Moravec, F. 1983. Some remarks on the biology of Capil-laria pterophylli Heinze, 1993. Folia Parasitologica (Praha) 30:129-130.
Noga, E.J. 1996. Fish disease: diagnosis and treatment. Mosby-Yearbook, Inc., St. Louis, MO.
Roberts, R.J., editor. 1989. Fish pathology, 2nd edition. Bailliere Tindall, London.
Stoskopf, M.K. 1993. Fish medicine. W.B. Saunders Com-pany, Philadelphia, PA.
Woo, P.T.K., editor. 1995. Fish diseases and disorders, volume 1: protozoan and metazoan infections. CAB International, Wallingford, United Kingdom.
Com
mon
Fre
shw
ater
Fis
h Pa
rasi
tes
Pict
oria
l Gui
de:
Nem
atod
esD
ebor
ah B
. Pou
der,
Eric
W. C
urtis
, Roy
P.E
. Yan
ong
Camallanu
s
Targ
et T
issu
es: I
ntes
tinal
trac
t; al
l oth
er o
rgan
sA
ppea
ranc
e: S
moo
th, c
ylin
dric
al, e
long
ated
, red
dish
thre
ad-li
ke w
orm
Size
: Up
to 1
cm in
leng
thM
ovem
ent:
Free
-mov
ing;
serp
entin
e (s
nake
-like
) mov
emen
tN
ote:
Ofte
n pr
otru
des f
rom
anu
s; liv
e-be
arer
; lar
vae
may
be
seen
in a
dult;
in
dire
ct li
fe c
ycle
(req
uire
s int
erm
edia
te in
vert
ebra
te h
ost)
Capilla
ria
Targ
et T
issu
es: G
astr
oint
estin
al tr
act
App
eara
nce:
Sm
ooth
, elo
ngat
ed, w
orm
; dou
ble-
oper
cula
ted
barr
el-s
hape
d eg
gs m
ay b
e se
en in
fem
ales
; may
see
eggs
onl
y in
fish
tiss
ues
Size
: Mal
es ap
prox
. 5.4
–7.4
mm
; gra
vid
fem
ales
appr
ox. 9
.4–1
6.5
mm
Mov
emen
t: Fr
ee-m
ovin
g; se
rpen
tine
(sna
ke-li
ke) m
ovem
ent
Not
e: D
irect
life
cyc
le; c
an sp
read
dire
ctly
from
fish
to fi
sh
Contracaecum
Targ
et T
issu
es: B
ody
cavi
ty, l
iver
, mus
cle,
hear
t, sw
im b
ladd
erA
ppea
ranc
e: G
ross
ly v
isibl
e; o
ften
seen
coile
d (e
ncys
ted)
Size
: Lar
vae
(foun
d in
fish
) up
to ap
prox
. 20
mm
in le
ngth
Mov
emen
t: M
ovem
ent u
sual
ly n
ot se
en in
fish
Not
e: In
dire
ct li
fe c
ycle
incl
udes
bird
s and
inve
rteb
rate
s
Eustrong
ylides
Targ
et T
issu
es: I
nter
nal t
issue
sA
ppea
ranc
e: G
ross
ly v
isibl
e; co
iled,
redd
ish w
orm
(enc
yste
d)Si
ze: L
arva
e (fo
und
in fi
sh) 1
1–83
mm
in le
ngth
Mov
emen
t: M
ovem
ent u
sual
ly n
ot se
en in
fish
Not
e: F
ish is
inte
rmed
iate
hos
t; de
finiti
ve h
ost i
s wad
ing
bird
; olig
ocha
ete
wor
m re
quire
d as
inte
rmed
iate
hos
t in
som
e sp
ecie
s
The
Inst
itute
of F
ood
and
Agric
ultu
ral S
cien
ces
(IFA
S) is
an
Equa
l Opp
ortu
nity
Inst
itutio
n au
thor
ized
to p
rovi
de re
sear
ch, e
duca
tiona
l inf
orm
atio
n an
d ot
her s
ervi
ces
only
to in
divi
dual
s an
d in
stitu
tions
that
func
tion
with
non
-dis
crim
inat
ion
with
re
spec
t to
race
, cre
ed, c
olor
, rel
igio
n, a
ge, d
isab
ility
, sex
, sex
ual o
rient
atio
n, m
arita
l sta
tus,
natio
nal o
rigin
, pol
itica
l opi
nion
s or
affi
liatio
ns. F
or m
ore
info
rmat
ion
on o
btai
ning
oth
er U
F/IF
AS
Exte
nsio
n pu
blic
atio
ns, c
onta
ct y
our c
ount
y’s
UF/
IFA
S Ex
tens
ion
office
.
U.S
. Dep
artm
ent o
f Agr
icul
ture
, UF/
IFA
S Ex
tens
ion
Serv
ice,
Uni
vers
ity o
f Flo
rida,
IFA
S, F
lorid
a A
& M
Uni
vers
ity C
oope
rativ
e Ex
tens
ion
Prog
ram
, and
Boa
rds
of C
ount
y Co
mm
issi
oner
s Co
oper
atin
g. N
ick
T. P
lace
, dea
n fo
r UF/
IFA
S Ex
tens
ion.FA
113