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HISTOPATOLOGI GYRODACTYLUS

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64, Bull. Eur. Ass. Fish Pathol., 35(2) 2015
˜–™Š›Š’ŸŽȱŽĜŒŠŒ¢ȱ˜ȱ˜›–Š•’—ǰȱ
›Žœ‘ ŠŽ›ȱŠ—ȱ‘¢›˜Ž—ȱ™Ž›˜¡’ŽȱŠŠ’—œȱ
Gyrodactylus cortiȱ’—ŽœŠ’˜—œȱ˜—ȱŒŠ™’ŸŽȱ
˜•ȬŽŽ•œȱǻAnarrhichthys ocellatus)
S. R. M. Jones1*, D. A. Thoney2ȱŠ—ȱǯȱ ǯȱŠ•›¢2
1
ŠŒ’ęŒȱ’˜•˜’ŒŠ•ȱŠ’˜—ǰȱ’œ‘Ž›’ŽœȱŠ—ȱŒŽŠ—œȱŠ—ŠŠǰȱřŗşŖȱ Š––˜—ȱŠ¢ȱ
˜ŠǰȱŠ—Š’–˜ǰȱ›’’œ‘ȱ˜•ž–‹’ŠǰȱşȱŜŝȱŠ—ŠŠDzȱ2Vancouver Aquarium,
ǯǯȱ˜¡ȱřŘřŘǰȱŠ—Œ˜žŸŽ›ǰȱ›’’œ‘ȱ˜•ž–‹’ŠǰȱŜȱřŞȱŠ—ŠŠ
Abstract
Gyrodactylus corti is a parasite which causes disease and elevated mortality in captive populations
˜ȱ‘Žȱ ˜•ȬŽŽ•ȱǻAnarrhichthys ocellatusǼǯȱ¡™˜œž›Žœȱ˜ȱ˜›–Š•’—ǰȱ›Žœ‘ ŠŽ›ȱ˜›ȱ‘¢›˜Ž—ȱ™Ž›˜¡’Žȱ
Ž›ŽȱŒ˜–™Š›Žȱ˜›ȱŽĜŒŠŒ¢ȱŠŠ’—œȱ‘Žȱ™Š›Šœ’Žȱ’—ȱ ˜ȱŽ¡™Ž›’–Ž—œǯȱ’¡¢ȱ–’—žŽȱ‹Š‘œȱ’—ȱ˜›–Š•’—ȱ
ǻŗśŖȱ˜›ȱŘŖŖȱ–ȦǼȱ Ž›Žȱ˜ž—ȱ˜ȱ‹Žȱ‘Žȱ–˜œȱŽĜŒŠŒ’˜žœȱ›ŽŠ–Ž—ȱ ’‘ȱ•˜ Ž›ȱ–˜›Š•’¢ȱŠ—ȱ–ŽŠ—ȱ
™Š›Šœ’Žȱ’—Ž—œ’¢ȱ ‘Ž—ȱŒ˜–™Š›Žȱ ’‘ȱ‘Žȱ˜‘Ž›ȱ›ŽŠ–Ž—œǯȱ‘ŽȱŽĜŒŠŒ¢ȱ˜ȱ›Žœ‘ ŠŽ›ȱ‹Š‘œȱǻśȱ
˜›ȱŞȱ–’—ȱž›Š’˜—Ǽȱ Šœȱ•Žœœȱ‘Š—ȱ‘Šȱ˜ȱ˜›–Š•’—ǰȱ‹žȱ‹ŽĴŽ›ȱ‘Š—ȱ˜‹œŽ›ŸŽȱ’—ȱ‘Žȱ›˜ž™œȱ›ŽŒŽ’Ÿ’—ȱ
řŖȱ–’—žŽȱ‹Š‘œȱ’—ȱ‘¢›˜Ž—ȱ™Ž›˜¡’ŽȱǻŗśŖȱ˜›ȱŘŖŖȱ–ȦǼǯȱ•‘˜ž‘ȱŽĜŒŠŒ’˜žœǰȱ˜›–Š•’—ȱ’œȱŒŠ›Œ’—˜Ž—’Œǰȱ•ŽœœŽ—’—ȱ’œȱœž’Š‹’•’¢ȱŠœȱŠȱ›ŽŠ–Ž—ȱ˜™’˜—ǯȱȱ‘’›ȱŽ¡™Ž›’–Ž—ȱ˜ž—ȱ‘ŠȱŽ¡™˜œž›Žȱ
˜ȱ‹›ŠŒ”’œ‘ȱ ŠŽ›ȱǻŗşȱ™Š›œȬ™Ž›Ȭ‘˜žœŠ—ȱœŠ•’—’¢Ǽȱ˜›ȱŗŜȱŠ¢œȱ ŠœȱŽĜŒŠŒ’˜žœȱ ‘Ž—ȱŒ˜–™Š›Žȱ˜ȱ
œŽŠ ŠŽ›ȱŒ˜—›˜•œȱǻřŖȱ™™ǼǯȱŠ—ŠŽ–Ž—ȱŠ—ȱ™›ŽŸŽ—’˜—ȱ˜ȱG. corti ’—ŽœŠ’˜—œȱ’—ȱŒŠ™’ŸŽȱ ˜•ȬŽŽ•ȱ
™˜™ž•Š’˜—œȱœ‘˜ž•ȱ’—Œ•žŽȱ›Žœ‘ȱ˜›ȱ‹›ŠŒ”’œ‘ȱ ŠŽ›ȱ›ŽŠ–Ž—œǯȱ
Introduction
Gyrodactylus (Monogenea: Gyrodactylida) is a
™›˜™˜›’˜—Š••¢ȱ‘’‘Ž›ȱœž›ŠŒŽȱŠ›ŽŠȱ˜ȱ‘Žȱœ–Š••ȱ
Ž—žœȱ˜ȱ™Š›Šœ’Žœȱ–Š’—•¢ȱ˜ž—ȱ˜—ȱ‘Žȱ’••œȱŠ—ȱ
꜑ȱ™žœȱ‘Ž–ȱŠȱ›ŽŠŽ›ȱ›’œ”ȱ˜ȱ‘Žȱ™‘¢œ’˜•˜’ŒŠ•ȱ
‹˜¢ȱœž›ŠŒŽœȱ˜ȱ꜑Žœȱ’—ȱ ŠŽ›œȱ˜ȱŠ••ȱœŠ•’—’’Žœǯȱ
The parasites are viviparous hermaphrodites
’–™ŠŒœȱ˜ȱ’–™Š’›Žȱ˜œ–˜›Žž•Š˜›¢ȱž—Œ’˜—ȱ
and can rapidly increase in numbers leading
ŒŠžœŽȱ‹¢ȱœŽŸŽ›Žȱ’—ŽŒ’˜—œǯȱŒ‘Ž•”•ŽȱŽȱŠ•ǯȱǻŘŖŖşǼȱ
•’œȱŞŞȱŒ˜–™˜ž—œȱžœŽȱ˜ȱ›ŽŠȱ¢›˜ŠŒ¢•’œȱ
˜ȱ’—ŽœŠ’˜—œȱ˜ȱ‘’‘ȱ’—Ž—œ’¢ȱ™Š›’Œž•Š›•¢ȱ’—ȱ
captive host populations (Thoney and Hargis,
Š—ȱŽ–™‘Šœ’£Žȱ‘Šȱ˜›ȱ˜™’–Š•ȱŽĜŒŠŒ¢ȱŒ˜—-
ŗşşŗDzȱ’••’Š–œȱŽȱŠ•ǯǰȱŘŖŖŞǼǯȱ žŸŽ—’•Žȱ꜑ȱŒŠ—ȱ
and the host-parasite system. The therapeutic
‘ŠŸŽȱ‘’——Ž›ȱŠ—ȱ–˜›Žȱ›Š’•Žȱœ”’—ȱ‘Š—ȱŠž•œȱ
making them more susceptible to damage
–Š›’—ȱ˜ȱœŽŸŽ›Š•ȱŒ˜–™˜ž—œȱ’œȱ—Š››˜ ȱŠ—ȱ
ŠŸŽ›œŽȱŽěŽŒœȱ˜ȱ›ŽŠ–Ž—ȱŒŠ—ȱ›Š—Žȱ›˜–ȱŠȱ
stress response and acute toxicity to structural
ŒŠžœŽȱ‹¢ȱœŽŸŽ›Žȱ’—ŽŒ’˜—œǯȱ —ȱŠ’’˜—ǰȱ‘Žȱ
sideration should be given to site conditions
Șȱ˜››Žœ™˜—’—ȱŠž‘˜›ȂœȱŽ–Š’•DZȱœ’–˜—ǯ“˜—Žœȓ˜Ȭ–™˜ǯŒǯŒŠ
Bull. Eur. Ass. Fish Pathol., 35(2) 2015, 65
Œ‘Š—ŽœȱŠěŽŒ’—ȱ‘Žȱ’••œȱ ‘’Œ‘ȱ‘ŠŸŽȱ—ŽŠ’ŸŽȱ
impacts on respiration, mucus production and
ŘŖŗŘȬŗřǯȱ‘’œȱ™›˜˜Œ˜•ȱ›Žšž’›Žȱ‘Šȱ꜑ȱ Ž›Žȱ
monitored at least twice daily and mortalities
œžœŒŽ™’‹’•’¢ȱ˜ȱœŽŒ˜—Š›¢ȱ’—ŽŒ’˜—œǯȱ‘žœȱœŠŽȱ
Š—ȱ–˜›‹’ȱŠ—’–Š•œȱ›Ž–˜ŸŽȱ›˜–ȱ‘ŽȱŠ—”ǯȱ
Š—ȱŽěŽŒ’ŸŽȱŠ•Ž›—Š’ŸŽœȱ˜›ȱ‘Žȱ›ŽŠ–Ž—ȱ˜ȱ
gyrodactylosis in aquaculture are required.
˜›‹’ȱ꜑ȱ Ž›ŽȱŽž‘Š—’£ŽȱŠ—ȱ’—Œ•žŽȱŠœȱ
‘Žȱ ˜•ȬŽŽ•ȱǻAnarrhichthys ocellatus) occurs in
–˜›Š•’’Žœǯȱ’œ‘ȱ–ŠœœȱŠȱ‘Žȱ˜—œŽȱ˜ȱŽŠŒ‘ȱŽ¡™Ž›’ment is provided in Table 1. Fish were reared
’—ȱ̘ ȱ‘›˜ž‘ǰȱŠŽ›ŠŽǰȱŠ–‹’Ž—ȱœŽŠ ŠŽ›ȱ
Œ˜ŠœŠ•ȱ ŠŽ›œȱ˜ȱ‘Žȱ˜›‘ȱŠŒ’ęŒȱŒŽŠ—ȱ›˜–ȱ
‘ŽȱŽŠȱ˜ȱ Š™Š—ȱ˜ȱ˜›‘Ž›—ȱŠ•’˜›—’Šǯȱ˜•Ȭ
ŽŽ•œȱŠ›Žȱ›ŽšžŽ—•¢ȱ–Š’—Š’—Žȱ’—ȱŠšžŠ›’ŠȱŠ—ȱ
ž—Ž›ȱœŽŠœ˜—Š•ȱ™‘˜˜™Ž›’˜ȱŠ—ȱŽȱŠ’•¢ȱ ’‘ȱ
‘Žȱœ™ŽŒ’Žœȱ’œȱŒ˜—œ’Ž›ŽȱŠœȱŠȱŒŠ—’ŠŽȱ˜›ȱŠš-
prior to treatments. Temperature and dissolved
uaculture. Gyrodactylus cortiȱ ŠœȱꛜȱŽœŒ›’‹Žȱ
›˜–ȱ‘Žȱœ”’—ȱŠ—ȱ’••œȱ˜ȱ ˜•ȬŽŽ•œȱ‘Ž•ȱŒŠ™’ŸŽȱ
˜¡¢Ž—ȱ Ž›Žȱ›ŽŒ˜›ŽȱŠ’•¢ȱ’—ȱŽŠŒ‘ȱ˜ȱ‘›ŽŽȱ
experiments (Table 1). Mean ambient salinity
at the Steinhart Aquarium in San Francisco,
ŠœȱŘşǯŜƹŖǯŗȱ™Š›œȬ™Ž›Ȭ‘˜žœŠ—ȱǻ™™ǼȱǻȬœŽ›’Žœȱ
Š•’˜›—’Šȱǻ’£Ž••ŽȱŠ—ȱ ›’œ”¢ǰȱŗşŜŝǼǯȱ˜›Žȱ
›Ž›ŠŒ˜–ŽŽ›ǰȱŽŽȱ ŽŽȱŒ’Ž—’ęŒǰȱ ’›”•Š—ǰȱ
›ŽŒŽ—•¢ǰȱ›ŽŒž››Ž—ȱ˜ž‹›ŽŠ”œȱ˜ȱ¢›˜ŠŒ¢•˜-
Šœ‘’—˜—ǼǯȱŽ••ȱ ŠŽ›ȱǻŖȱ™™Ǽȱ ŠœȱžœŽȱ˜›ȱ
‘Žȱ›Žœ‘ ŠŽ›ȱ‹Š‘ȱ›ŽŠ–Ž—œȱŠ—ȱŒ˜–‹’—Žȱ
with the ambient seawater to create the brackish water treatments in Experiment (Exp.) 3.
sis associated with elevated mortality were
˜‹œŽ›ŸŽȱŠ–˜—ȱŒŠ™’ŸŽȱ ˜•ȬŽŽ•œȱ’—ȱ›’’œ‘ȱ
˜•ž–‹’ŠȱǻǯǯǼǰȱŠ—ŠŠǯȱ‘Žȱ ˜•ȬŽŽ•ȱ™Š›Šœ’Žȱ
›˜–ȱ‘ŽȱŠ—Š’Š—ȱ˜ž‹›ŽŠ”ȱ Šœȱ’Ž—’ꮍȱŠœȱ
G. corti and shown, using morphological and
a commercial black cod diet (Taplow Feeds,
‘’••’ ŠŒ”ǰȱǯǯǼǯȱŽŽȱ Šœȱ ’‘‘Ž•ȱ˜›ȱŘŚȱ‘ȱ
molecular data, to be related to G. perlucidus
›˜–ȱ‘ŽȱŽŽ•™˜žœȱǻZoarces viviparus) and (Z. v.
Infection
—ŽȱŠ—”ȱ˜ȱ’—ŽŒŽȱ ˜•ȬŽŽ•œȱ Šœȱ‘Žȱ’›ŽŒȱ
œ˜ž›ŒŽȱ˜ȱ’—ŽŒŽȱŠ—’–Š•œȱ˜›ȱ¡™ǯȱŗȱŠ—ȱœŽ›ŸŽȱ
elongates), G. errabundus ›˜–ȱZ. viviparus, and G.
Šœȱ‘ŽȱŒ˜‘Š‹’Š—ȱœ˜ž›ŒŽȱ˜ȱ’—ŽŒ’˜—ȱ˜›ȱ¡™œǯȱŘȱ
anarhichatisȱ›˜–ȱ•Š—’Œȱ ˜•Ȭ꜑ȱǻAnarhichas
Š—ȱřǯȱ —ȱ‘Žȱ•ŠĴŽ›ȱŽ¡™Ž›’–Ž—œǰȱ—ŠÊŸŽȱ ˜•ȬŽŽ•œȱ
lupusǼȱŠ—ȱœ™˜ĴŽȱ ˜•Ȭ꜑ȱǻA. minor) (King et
were placed into a mesh cage in the source tank.
al., 2014). The present research describes a labo-
‘Ž—ȱ꜑ȱ‹ŽŠ—ȱ˜ȱœ‘˜ ȱœ’—œȱ˜ȱ’—ŽŒ’˜—ǰȱ
›Š˜›¢ȱ–Ž‘˜ȱ˜›ȱ‘ŽȱŒ˜‘Š‹’Š’˜—ȱŽ¡™˜œž›Žȱ˜ȱ
A. ocellatus to G. cortiȱŠ—ȱŽŸŠ•žŠŽœȱ‘ŽȱŽĜŒŠŒ¢ȱ
‘Ž¢ȱ Ž›ŽȱœŠ–™•Žȱ˜ȱŽŽ›–’—Žȱ‘Žȱ•ŽŸŽ•ȱ˜ȱ
’—ŽŒ’˜—ȱǻ™›ŽȬ›ŽŠ–Ž—ȱœŠ–™•ŽǼǰȱŠ—ȱ–˜ŸŽȱ
˜ȱ˜›–Š•Ž‘¢Žǰȱ›Žœ‘ ŠŽ›ȱŠ—ȱ‘¢›˜Ž—ȱ
to the biosecure aquarium at DFO-CAER and
™Ž›˜¡’ŽȱŠŠ’—œȱ‘Žȱ’—ŽŒ’˜—œǯȱ
randomly distributed into experimental tanks.
Materials and methods
Parasite counts were made at three times: prior
˜ȱŽ¡™˜œž›Žȱ˜ȱŒ˜—ę›–ȱŠ‹œŽ—ŒŽȱ˜ȱ’—ŽŒ’˜—ȱ
Fish
žŸŽ—’•Žȱ—ŠÊŸŽȱ ˜•ȬŽŽ•œȱ Ž›Žȱ˜‹Š’—Žȱ›˜–ȱ‘Žȱ
ǻ—ƽŗŘǼǰȱ˜••˜ ’—ȱŽ¡™˜œž›Žȱ‹žȱ™›’˜›ȱ˜ȱ›ŽŠ-
Vancouver Aquarium and treatment trials were
–Ž—ȱǻ—ƽŗŖǼȱŠ—ȱŠ–˜—ȱœž›Ÿ’Ÿ’—ȱ꜑ȱŠȱ‘Žȱ
conducted at the Fisheries and Oceans Canada,
Ž›–’—Š’˜—ȱ ˜ȱ ŽŠŒ‘ȱ Ž¡™Ž›’–Ž—ǯȱ —ȱ ¡™œǯȱ ŗȱ
Ž—›Žȱ˜›ȱšžŠŒž•ž›ŽȱŠ—ȱ‘Žȱ—Ÿ’›˜—–Ž—ȱ
ǻȬǼȱ’—ȱŽœȱŠ—Œ˜žŸŽ›ȱž—Ž›ȱŠŒ’ęŒȱ
Š—ȱŘǰȱ‘›ŽŽȱ꜑ȱœž›Ÿ’Ÿ’—ȱ’—ȱŽŠŒ‘ȱŠ—”ȱǻ—ƽşȱ
per treatment) were randomly sampled and in
Exp. 3, two survivors per tank were sampled
Ž’˜—Š•ȱ—’–Š•ȱ Š›Žȱ ˜––’ĴŽŽȱ ™›˜˜Œ˜•ȱ
66, Bull. Eur. Ass. Fish Pathol., 35(2) 2015
Table 1.ȱ¡™Ž›’–Ž—Š•ȱŽœ’—ǰȱœ‘˜ ’—ȱ ŠŽ›ȱ™Š›Š–ŽŽ›œȱŠ—ȱŒ˜—ŒŽ—›Š’˜—ȱŠ—ȱž›Š’˜—ȱ˜ȱ›ŽŠ–Ž—œǯȱ••ȱ
groups included a seawater control.
Experi- Duration Temperament
(days)
ture1
(°C)
Dissolved
Oxygen1
(mg L-1)
Initial ęsh
mass1 (g)
Formalin
Salinity2
H2O2
(exposure time)
1
12
ŞǯśƹŖǯŖŘ
7.3±0.03
33.3±2.5
150 ppm
(60 min)
150 ppm
(30 min)
0 ppt
(5 min)
2
26
ŞǯśƹŖǯŖŗ
9.1±0.07
60.1±10.1
200 ppm
(60 min)
200 ppm
(30 min)
0 ppt
ǻŞȱ–’—Ǽ
3
16
ŞǯśƹŖǯŖŚ3
10.2±0.11
42.3±5.9
---
---
30–15ppt4
1
Mean ± standard error; 2Ŗȱ™™ȱ’œȱŗŖŖƖȱꕝŽ›Žȱ Ž••ȱ ŠŽ›Dz 3ŸŽ›ŠŽȱŽ–™Ž›Šž›Žȱ˜ȱ‹›ŠŒ”’œ‘ȱ ŠŽ›ȱ ŠœȱŝǯŘǚDzȱ
œŽŽȱ’ž›ŽȱŘȱ˜›ȱ›ŠŽȱ˜ȱŽŒ›ŽŠœŽȱ’—ȱœŠ•’—’¢
4
ǻ—ƽŞȱ™Ž›ȱ›ŽŠ–Ž—Ǽǯȱ˜••˜ ’—ȱŽž‘Š—Šœ’Šȱ’—ȱ
were mounted on glass slides, stained with
›’ŒŠ’—Žȱ–Ž‘Š—˜œž•™‘˜—ŠŽȱǻŘŖŖȱ–ȦǼǰȱŽŠŒ‘ȱ
survivor was weighed then individually placed
haematoxylin and eosin, cover-slipped and
examined using a compound microscope (Zeiss
’—˜ȱŠȱ‹ŠȱŒ˜—Š’—’—ȱřŖȱ–ȱ˜ȱ™›Š£’šžŠ—Ž•ȱ
Axio Imager) equipped with a digital imaging
system (Axiocam MRc5).
ǻřŖȱ–ȦǼȱ˜›ȱ˜ž›ȱ‘˜ž›œȱ˜ȱ’œ•˜Žȱ™Š›Šœ’Žœȱ
›˜–ȱ’••œȱŠ—ȱŒŠ›ŒŠœœǯȱž™•’ŒŠŽȱŠ•’šž˜œȱ˜ȱ
the solution containing the detached parasites
were placed into an improved Neubauer hae-
Experimental design
The study design and conditions in the three
–ŠŒ¢˜–ŽŽ›ȱǻ ŠžœœŽ›ȱŒ’Ž—’ęŒǰȱ ˜›œ‘Š–ǰȱǼȱ
experiments are summarised in Table 1. A ran-
Š—ȱ–’Œ›˜œŒ˜™’ŒŠ••¢ȱŽ¡Š–’—Žǯȱ‘Žȱ—ž–‹Ž›ȱ˜ȱ
˜–’£Žȱ‹•˜Œ”ȱŽœ’—ȱ ŠœȱžœŽȱ˜›ȱ¡™œǯȱŗȱŠ—ȱ
parasites recorded in the ruled area was then
used to estimate mean intensity (MI, parasites
™Ž›ȱ’—ŽŒŽȱ꜑ǼȱŠ—ȱ–ŽŠ—ȱ’—ŽŒ’˜—ȱŽ—œ’¢ȱ
ǻ ǰȱ™Š›Šœ’Žœȱ™Ž›ȱȱ’—ŽŒŽȱ꜑Ǽǯȱ‘Žȱ—ž–‹Ž›ȱ
Řȱ’—ȱ ‘’Œ‘ȱŗŖȱ꜑ȱ Ž›ŽȱŠ••˜ŒŠŽȱ’—˜ȱŽŠŒ‘ȱ˜ȱŗŘȱ
Š—”œǰȱ‘›ŽŽȱ˜ȱ ‘’Œ‘ȱ Ž›ŽȱŠœœ’—Žȱ˜ȱŽŠŒ‘ȱ˜ȱ
˜ȱ™Š›Šœ’Žœȱ Šœȱ—˜ȱŽŽ›–’—Žȱ˜›ȱ꜑ȱ‘Šȱ
˜ž›ȱ›ŽŠ–Ž—ȱ›˜ž™œȱǻœŽŠ ŠŽ›ȱŒ˜—›˜•ǰȱ˜›–Šlin, H2O2ȱŠ—ȱ›Žœ‘ ŠŽ›Ǽǯȱ‘ŽȱŠ—”œȱ Ž›ŽȱŗŘŖȱ
ȱ˜ŸŠ•ǰȱꋛŽ•ŠœœȱŠ—”œȱœž™™•’Žȱ ’‘ȱŠ–‹’Ž—ȱ
died during an experiment.
˜¡¢Ž—ŠŽȱœŽŠ ŠŽ›ǯȱ —ŽŒŽȱ꜑ȱ Ž›Žȱ›ŽŠŽȱ
by aerated bath immersion and were monitored
Histology
ŽŠ•‘¢ȱŠ—ȱ–˜›’‹ž—ȱ꜑ȱ Ž›ŽȱŽž‘Š—’£Žǰȱ
Œ•˜œŽ•¢ȱ˜›ȱ‘Žȱž›Š’˜—ȱ˜ȱ‘ŽȱŽ¡™˜œž›ŽǰȱŠœȱ
indicated in Table 1. Formalin was obtained
Š—ȱŠ••ȱ•Žȱ’••ȱŠ›Œ‘Žœȱ Ž›ŽȱŽ¡Œ’œŽȱŠ—ȱę¡Žȱ’—ȱ
ŠœȱŠȱřŝƖȱ˜›–Š•Ž‘¢Žȱœ˜•ž’˜—ȱǻ—ŠŒ‘Ž–’ŠǼȱ
ŗŖƖȱ—Žž›Š•ȱ‹žěŽ›Žȱ˜›–Š•’—ȱŠȱ›˜˜–ȱŽ–™Ž›Š-
and hydrogen peroxide was antiseptic grade
ž›Žȱ˜›ȱŘŚȱ˜ȱŚŞȱ‘ǯȱ’¡Žȱ’œœžŽœȱ Ž›Žȱ›Š—œŽ››Žȱ
(3%, Exact, Superstore). The chemicals were
to 70% ethanol and dehydrated in an alcohol
gradient, cleared in xylene, embedded with
diluted in seawater to the desired concentration.
—ŽŒŽȱ꜑ȱ Ž›Žȱ›Š—œŽ››Žȱ˜ȱ‘Žȱ›ŽŠ–Ž—ȱ
‹Š‘œȱ‹¢ȱ’™ȱ—Žȱ˜—Žǰȱ‘›ŽŽȱŠ—ȱ꟎ȱŠ¢œȱ˜•-
™Š›ŠĜ—ȱŠ—ȱœŽŒ’˜—ŽȱŠȱřȱ˜ȱśȱΐ–ǯȱŽŒ’˜—œȱ
Bull. Eur. Ass. Fish Pathol., 35(2) 2015, 67
Figure 1.ȱ˜•ȬŽŽ•ȱǻAnarrhichthys ocellatusǼȱ’••ȱœ‘˜ ’—ȱ’—ŽŒ’˜—ȱ ’‘ȱGyrodactylus corti Arrows illustrate
‘Š™˜›Š•ȱŠĴŠŒ‘–Ž—ȱ˜ȱœŽŒ˜—Š›¢ȱ•Š–Ž••ŠŽǯȱ ŠŽ–Š˜¡¢•’—ȱŠ—ȱŽ˜œ’—ǯȱ
•˜ ’—ȱ˜—œŽȱ˜ȱ‘ŽȱŽ¡™Ž›’–Ž—ǯȱ —ȱ¡™ǯȱřǰȱŠȱ
˜Š•ȱ˜ȱŗśȱ’—ŽŒŽȱ꜑ȱ Ž›ŽȱŠœœ’—Žȱ˜ȱŽŠŒ‘ȱ
’œœ˜•ŸŽȱ˜¡¢Ž—ȱ’쎛Ž—ŒŽœȱ ’‘ȱŠ—ȱ‹Ž ŽŽ—ȱ
‘Žȱ’쎛Ž—ȱ›ŽŠ–Ž—ȱ›˜ž™œȱ’—ȱ¡™œǯȱŗȱŠ—ȱŘǯȱ
˜ȱŽ’‘ȱŠ—”œǯȱȱ›Š—˜–’£Žȱ‹•˜Œ”ȱŽœ’—ȱ Šœȱ
žœŽȱ˜ȱ’—Œ•žŽȱ˜ž›ȱ›Ž™•’ŒŠŽȱ›ŽŠ–Ž—ȱŠ—”œȱ
˜›ȱ¡™ǯȱřǰȱŒ˜–™Š›’œ˜—œȱ˜ȱ ȱŠ—ȱ ȱ‹Ž ŽŽ—ȱ
‘ŽȱŘȱ›ŽŠ–Ž—ȱ›˜ž™œǰȱŠœȱ Ž••ȱŠœȱ’쎛Ž—ŒŽœȱ
representing both seawater and brackish water
in temperatures, salinity, and dissolved oxygen
treatment groups. Brackish water was obtained
were determined using the Mann-Whitney rank
‹¢ȱ’—Œ›ŽŠœ’—ȱ‘Žȱ̘ ȱ˜ȱ›Žœ‘ ŠŽ›ȱ˜ŸŽ›ȱœŽŸŽ—ȱ
Š¢œȱ˜ȱŠŒ‘’ŽŸŽȱŠȱœŠ•’—’¢ȱ˜ȱŠ™™›˜¡’–ŠŽ•¢ȱ
sum tests. Percent cumulative mortality data
in all experiments were analyzed by 2-way
19 ppt (see Figure 3). The experiments were
Š—Š•¢œ’œȱ˜ȱŸŠ›’Š—ŒŽȱǻǼȱ˜—ȱ›Š—œ˜›–Žȱ
terminated when mortalities in at least one
data (arcsin square root), to examine possible
Š—”ȱŠ™™›˜ŠŒ‘ŽȱŞŖƖǰȱŠȱ‘Žȱ’–Žœȱ’—’ŒŠŽȱ
’—Ž›ŠŒ’˜—œȱ‹Ž ŽŽ—ȱ›ŽŠ–Ž—œȱŠ—Ȧ˜›ȱ›Ž™-
in Table 1.
•’ŒŠŽœȱǻŠ—”ȱŽěŽŒœǼǯȱž”Ž¢ȱŽœœȱ Ž›Žȱ‘Ž—ȱ
žœŽȱ˜ȱž›‘Ž›ȱŽ¡Š–’—Žȱ’쎛Ž—ŒŽœȱ‹Ž ŽŽ—ȱ
Š’œ’ŒŠ•ȱ’쎛Ž—ŒŽœȱ’—ȱ ȱŠ—ȱ ȱ‹Ž ŽŽ—ȱ
‘Žȱ›ŽŠ–Ž—ȱ›˜ž™œǯȱ‘Ž›Žȱ Ž›Žȱ—˜ȱœ’—’ęŒŠ—ȱ
treatments groups in Exps. 1 and 2 were determined using the Kruskal-Wallis one way anal¢œ’œȱ˜ȱŸŠ›’Š—ŒŽȱ˜—ȱ›Š—”œǰȱ˜••˜ Žȱ‹¢ȱž——Ȃœȱ
Žœœȱ˜›ȱ™Š’› ’œŽȱŒ˜–™Š›’œ˜—œǯȱȱ˜—ȱ›Š—”ȱ
›Ž™•’ŒŠŽȦŠ—”ȱŽěŽŒœȱ—˜ŽȱŠȱŠ—¢ȱ’–Žȱǻ™ǁŖǯŖśǼǯȱ
tests also were used to examine temperature and
••ȱœŠ’œ’ŒŠ•ȱŠ—Š•¢œŽœȱ Ž›Žȱ™Ž›˜›–Žȱžœ’—ȱ
SIGMASTAT (SPSS, Chicago, Illinois) and sig—’ęŒŠ—ŒŽȱ—˜Žȱ˜›ȱ‘ŽȱŠ‹˜ŸŽȱŽœœȱ ‘Ž—ȱǀŖǯŖśǯ
ŜŞǰȱž••ǯȱž›ǯȱœœǯȱ’œ‘ȱŠ‘˜•ǯǰȱřśǻŘǼȱŘŖŗś
Results
—ȱ ¡™ǯȱ ŗǰȱ ‘Ž›Žȱ Ž›Žȱ —˜ȱ œ’—’ęŒŠ—ȱ ’쎛-
among treatments or tank replicates in either
Ž–™Ž›Šž›Žȱ˜›ȱȱǻ™ǁŖǯŖśǼǯȱŽ›ȱŠ—ȱŗŗȱŠ¢ȱ
ences among treatments or tank replicates in
exposure in the source tank, parasites were
either temperature or dissolved oxygen (DO)
ǻǰȱ™ǁŖǯŖśǼǯȱ‘Žȱœ˜ž›ŒŽȱ’—ŽŒ’˜—œȱ Ž›Žȱ
ŽŽŒŽȱ˜—ȱŠ••ȱ™›Ž›ŽŠŽȱ꜑ȱǻŠ‹•ŽȱŘǼǯȱž-
approximately 21 days old and Gyrodactylus
cortiȱ Ž›Žȱ™›ŽœŽ—ȱ˜—ȱŠ••ȱ™›Ž›ŽŠŽȱ꜑ȱǻŠ‹•Žȱ
ŘǼǯȱ —ŽŒ’˜—ȱ ŠœȱŠœœ˜Œ’ŠŽȱ ’‘ȱŽ™’‘Ž•’Š•ȱŒŽ••ȱ
›˜–ȱŖƖȱ’—ȱ˜›–Š•’—Ȭ›ŽŠŽȱ˜ȱŗŖǯŖȱƹȱśǯŞƖȱ˜›ȱ
›Žœ‘ ŠŽ›Ȭ›ŽŠŽǰȱśŖǯŖȱƹȱŗśǯřƖȱ˜›ȱ 2O2-treated
‘¢™Ž›™•Šœ’ŠȱŠ—ȱ ’‘ȱŒ•ž‹‹’—ȱŠ—ȱžœ’˜—ȱ˜ȱ
Ž—ȱ˜ȱ‘ŽȱŽ¡™Ž›’–Ž—ǰȱ™Š›Šœ’Žœȱ Ž›ŽȱŽŽŒŽȱ
‘ŽȱœŽŒ˜—Š›¢ȱ•Š–Ž••ŠŽȱǻ’ž›ŽǯȱŗǼǯȱ‘Žȱ’••œȱ˜ȱ
꜑ȱ–Š’—Š’—Žȱ’—ȱ‹›ŠŒ”’œ‘ȱ ŠŽ›ȱœ‘˜ Žȱ–’•ȱ
˜—ȱŘȱ˜ȱşȱœž›Ÿ’Ÿ’—ȱ꜑ȱ›ŽŠŽȱ ’‘ȱ˜›–Š•’—ǰȱ
˜—ȱŞȱ˜ȱşȱ›ŽŠŽȱ ’‘ȱ›Žœ‘ ŠŽ›ǰȱŠ—ȱ˜—ȱŠ••ȱşȱ
to severe edematous swelling and truncation
˜ȱ•Š–Ž••ŠŽǰȱŒ˜–™Š›Žȱ ’‘ȱœŽŠ ŠŽ›ȱŒ˜—›˜•œǯȱ
seawater controls and all 9 treated with H2O2.
˜••˜ ’—ȱ›ŽŠ–Ž—ǰȱ œȱ Ž›Žȱ—˜ȱœ’—’ęŒŠ—-
mulative percent mortality over 26 d ranged
Š—ȱŝŖǯŖȱƹȱŗŖǯŖƖȱ˜›ȱ‘ŽȱœŽŠ ŠŽ›ȱŒ˜—›˜•œǯȱȱ‘Žȱ
•¢ȱ’쎛Ž—ȱ‹Ž ŽŽ—ȱ˜›–Š•’—ȬȱŠ—ȱ›Žœ‘ Šž–ž•Š’ŸŽȱ™Ž›ŒŽ—ȱ–˜›Š•’¢ȱ˜ŸŽ›ȱŗŘȱȱ˜••˜ ’—ȱ›ŽŠ–Ž—ȱ Šœȱœ’—’ęŒŠ—•¢ȱ•˜ Ž›ȱǻ™ǀŖǯŖśǼȱ
’—ȱ‘Žȱ˜›–Š•’—ȱ›ŽŠŽȱ꜑ȱǻŗŜǯŝȱƹȱŜǯŝȱƖǼȱ ‘Ž—ȱ
Œ˜–™Š›Žȱ˜ȱŠ••ȱ˜‘Ž›ȱřȱ›˜ž™œǯȱ‘Žȱ›Žœ‘ ŠŽ›ȱ
›ŽŠŽȱ꜑ȱ‘Šȱ‘’‘Ž›ȱ–˜›Š•’¢ȱǻŚŖǯŖȱƹȱśǯŞƖǼȱ
‘Š—ȱ‘Žȱ˜›–Š•’—ȱ›˜ž™ǰȱ‹žȱ Šœȱœ’—’ęŒŠ—•¢ȱ
Ž›Ȭ›ŽŠŽȱ›˜ž™œȱŠ—ȱ‹˜‘ȱ Ž›Žȱœ’—’ęŒŠ—•¢ȱ
lower than in the controls (Table 2). The MI in
the H2O2Ȭ›ŽŠŽȱ›˜ž™ȱ Šœȱ—˜ȱœ’—’ęŒŠ—•¢ȱ
’쎛Ž—ȱ›˜–ȱ‘Žȱ˜‘Ž›ȱ›ŽŠŽȱ›˜ž™œȱŠ—ȱ
the seawater controls. Similar trends among
IDs were observed.
lower (p<0.05) than the H2O2 and control groups,
‘’Œ‘ȱ Ž›Žȱœ’–’•Š›ȱ˜ȱŽŠŒ‘ȱ˜‘Ž›ȱǻŞŖǯŖȱƹȱśǯŞƖȱ
Š—ȱŞřǯřȱƹȱřǯřƖǰȱ›Žœ™ŽŒ’ŸŽ•¢Ǽǯȱȱ‘ŽȱŽ—ȱ˜ȱ
—ȱ¡™ǯȱřǰȱ‘Ž›Žȱ Ž›Žȱœ’—’ęŒŠ—ȱ’쎛Ž—ŒŽœȱ
between the brackish water and seawater con-
the experiment, parasites were present on all
œž›Ÿ’Ÿ’—ȱ꜑ȱœŠ–™•Žȱ ’‘ȱ‘ŽȱŽ¡ŒŽ™’˜—ȱ˜ȱ
trols in temperature, DO, and salinity (p<0.05).
‘˜œŽȱ›ŽŠŽȱ ’‘ȱ˜›–Š•’—ǰȱ˜ȱ ‘’Œ‘ȱřȱ˜ȱşȱ
•’—’¢ȱ’—ȱ‘Žȱ‹›ŠŒ”’œ‘ȱ›˜ž™œȱ›˜–ȱŘşǯŝȱƹȱŖǯŗȱ™™ȱ
Ž›Žȱ’—ŽŒŽǯȱ ȱ’—ȱ˜›–Š•’—Ȭ›ŽŠŽȱœž›Ÿ’Ÿ˜›œȱ
˜ȱŗŞǯŞȱƹȱŖǯŜȱ™™ȱǻ’ž›ŽȱŘǼǯȱ›ŠŒ”’œ‘ȱ ŠŽ›ȱŠ•œ˜ȱ
Šœȱœ’—’ęŒŠ—•¢ȱ•˜ Ž›ȱŒ˜–™Š›Žȱ ’‘ȱ‘˜œŽȱ
in the seawater controls and H2O2Ȭ›ŽŠŽȱ꜑ȱ
‘Šȱ•˜ Ž›ȱ–ŽŠ—ȱŽ–™Ž›Šž›ŽȱǻŝǯŗśȱƹȱŖǯŗȱǚǼȱ
Š—ȱ‘’‘Ž›ȱ–ŽŠ—ȱȱǻŗŖǯŝȱƹȱŖǯŗȱ–ȦǼȱ‘Š—ȱ’—ȱ
ǻŠ‹•ŽȱŘǼǯȱ œȱ’—ȱ—Ž’‘Ž›ȱ›Žœ‘ ŠŽ›Ȭ›ŽŠŽȱ
Œ˜—›˜•ȱŠ—”œȱǻŞǯśȱƹȱŖǯŖŚȱǚǰȱŠ—ȱŗŖǯŘȱƹȱŖǯŗȱ–Ȧǰȱ
꜑ȱ—˜›ȱ
O2Ȭ›ŽŠŽȱ꜑ȱ Ž›Žȱœ’—’ęŒŠ—•¢ȱ
respectively). Cumulative percent mortality
’쎛Ž—ȱ›˜–ȱŒ˜—›˜•œǯȱ‘Žȱ ȱ˜›ȱ›Žœ‘ Š-
ž›’—ȱ‘ŽȱŗŜȱȱŽ¡™Ž›’–Ž—ȱ Šœȱœ’—’ęŒŠ—•¢ȱ
Ž›Ȭ›ŽŠŽȱ꜑ȱ Šœȱœ’—’ęŒŠ—•¢ȱ•˜ Ž›ȱ‘Š—ȱ
˜›ȱ™Ž›˜¡’Žȱ›ŽŠ–Ž—ǯȱ œȱ˜••˜ ŽȱŠȱœ’–’•Š›ȱ
higher (p=0.003) in seawater controls compared
˜ȱ꜑ȱ’—ȱ‹›ŠŒ”’œ‘ȱ ŠŽ›ȱǻŝŗǯŝȱƹȱŞǯŞȱƖȱŠ—ȱŘřǯřȱƹȱ
™ŠĴŽ›—ȱŠ–˜—ȱ›˜ž™œǰȱ ’‘ȱ‘ŽȱŽ¡ŒŽ™’˜—ȱ˜ȱ
śǯŞȱƖǰȱ›Žœ™ŽŒ’ŸŽ•¢Ǽȱǻ’ž›ŽȱŘǼǯȱȱ‘ŽȱŽ—ȱ˜ȱ‘Žȱ
‘Žȱ›Žœ‘ ŠŽ›Ȭ›ŽŠŽȱ꜑ǰȱ ‘’Œ‘ȱ Ž›Žȱ˜ž—ȱ
˜ȱ‹Žȱœ’—’ęŒŠ—•¢ȱ•˜ Ž›ȱ‘Š—ȱ˜›ȱ‘Žȱ™Ž›˜¡’Žȱ
›ŽŠŽȱ꜑ȱǻŠ‹•ŽȱŘǼǯȱ
Ž¡™Ž›’–Ž—ǰȱ™Š›Šœ’Žœȱ Ž›ŽȱŽŽŒŽȱ˜—ȱŠ••ȱŞȱ꜑ȱ
2
—ȱ¡™ǯȱŘǰȱ‘Ž›Žȱ Ž›Žȱ—˜ȱœ’—’ęŒŠ—ȱ’쎛Ž—ŒŽœȱ
‘ŽȱŠ’’˜—ȱ˜ȱ›Žœ‘ ŠŽ›ȱ•˜ Ž›Žȱ–ŽŠ—ȱœŠ-
examined in both groups. The MI and DI were
œ’—’ęŒŠ—•¢ȱ‘’‘Ž›ȱ’—ȱ‘ŽȱŒ˜—›˜•œȱŒ˜–™Š›Žȱ
˜ȱ‘Žȱ‹›ŠŒ”’œ‘ȱ ŠŽ›ȱŽ¡™˜œŽȱ꜑ȱǻŠ‹•ŽȱŘǼǯȱ
Bull. Eur. Ass. Fish Pathol., 35(2) 2015, 69
Table 2. Gyrodactylus cortiȱ ’—ŽŒ’—ȱ ˜•ȬŽŽ•œȱ ǻAnarrhichthys ocellatus) (mean ± standard error). Number
’—ŽŒŽȱȦȱ—ž–‹Ž›ȱŽ¡Š–’—Žȱǻ ȦǼǯȱ —Ž—œ’¢ȱǻ—ž–‹Ž›ȱ™Ž›ȱ’—ŽŒŽȱ꜑ǰȱ—ǼȱŠ—ȱ’—ŽŒ’˜—ȱŽ—œ’¢ȱǻ—ž–‹Ž›ȱ™Ž›ȱ
ȱ’—ŽŒŽȱ꜑Ǽȱ‹Ž˜›ŽȱŠ—ȱ˜••˜ ’—ȱ›ŽŠ–Ž—œȱ’—ȱŽŠŒ‘ȱ˜ȱ‘Žȱ‘›ŽŽȱŽ¡™Ž›’–Ž—œǯȱŽĴŽ›ȱœž™Ž›œŒ›’™œȱ’—’ŒŠŽȱ
œŠ’œ’ŒŠ••¢ȱœ’—’ęŒŠ—ȱ’쎛Ž—ŒŽœȱǻ™ǀŖǯŖśDzȱž——Ȃœȱ–ž•’™•ŽȱŒ˜–™Š›’œ˜—ȱŽœǼǯ
Treatments
I/E
Mean Intensity
Mean Infection Density
Pre-treatment
ŗŖȦŗŖ
13.0 x 104 ± 1.47 x 104
4.25 x 103ȱƹȱŖǯŝŞȱ¡ȱŗŖ3
Formalin
řȦş
1.67 x 104 ± 0 a
0.57 x 103 ± 0.16 x 103 a
Freshwater
şȦş
5.00 x 104 ± 0.92 x 104 ab
1.15 x 103 ± 0.25 x 103 a
Hydrogen Peroxide
ŜȦŜ
23.1 x 104 ± 6.35 x 104 c
6.32 x 103 ± 1.39 x 103 b
Seawater Control
śȦś
17.7 x 104 ± 5.10 x 104 b
3.24 x 103 ± 0.62 x 103 bc
Pre-treatment
ŗŖȦŗŖ
4.70 x 104 ± 0.70 x 104
0.97 x 103 ± 0.20 x 103
Formalin
ŘȦş
1.67 x 104 ± 0 a
0.16 x 103 ± 0.03 x 103 a
Freshwater
ŞȦş
6.04 x 104 ± 2.76 x 104 a
ŖǯŞşȱ¡ȱŗŖ3 ± 0.45 x 103 a
Hydrogen Peroxide
şȦş
5.90 x 104 ± 1.50 x 104 a
1.11 x 103 ± 0.26 x 103 ab
Seawater Control
şȦş
30.4 x 104 ± 6.00 x 104 b
4.51 x 103ȱƹȱŖǯşŞȱ¡ȱŗŖ3 b
Pre-treatment
ŗŖȦŗŖ
14.3 x 104 ± 2.44 x 104
3.70 x 103 ± 0.65 x 103
Brackish water
ŞȦŞ
śǯŞřȱ¡ȱŗŖ4 ± 0.55 x 104 a
0.97 x 103 ± 0.10 x 103 a
Seawater control
ŞȦŞ
17.5 x 104 ± 2.64 x 104 b
2.74 x 103 ± 0.55 x 103 b
Experiment 1
Experiment 2
Experiment 3
Figure 2.ȱŽ•Š’˜—œ‘’™ȱ‹Ž ŽŽ—ȱœŽŠ ŠŽ›ȱœŠ•’—’¢ȱŠ—ȱ‘ŽȱŒž–ž•Š’ŸŽȱ–˜›Š•’¢ȱŠ–˜—ȱ ˜•ȬŽŽ•œȱ’—ŽŒŽȱ
with Gyrodactylus corti (Experiment 3). The seawater treatment group were maintained at constant salinity
(salinity shown by dashed line) and the brackish water treatment group at declining salinity (solid line).
Cumulative percent mortalities are illustrated by U and S, respectively.
70, Bull. Eur. Ass. Fish Pathol., 35(2) 2015
Table 3.ȱ Ž•Š’ŸŽȱ ™Ž›ŒŽ—ȱ Ž’ŒŠŒ¢ȱ ǽȱ ƽȱ
ŗȬǻ›ŽŠ–Ž—ȱ ’—ŽŒ’˜—ȱ Ž—œ’¢ȱ Ȧȱ Œ˜—›˜•ȱ ’—ŽŒ’˜—ȱ
density) x 100%] by treatment in each experiment
Treatment
Experiment
ŗǼǰȱŠ—ȱ‘Žȱž›‘Ž›ȱŽ•Š¢ȱ’—ȱ˜—œŽȱ˜ȱ–˜›Š•’¢ȱ’—ȱ
‘Žȱ‘¢›˜Ž—ȱ™Ž›˜¡’ŽȱŠ—ȱ›Žœ‘ȱ ŠŽ›ȱ›ŽŠ–Ž—ȱ›˜ž™œǯȱ —ȱŠ’’˜—ǰȱ‘Žȱ•Š›Ž›ȱ꜑ȱžœŽȱ
’—ȱ¡™ǯȱŘȱ•Žȱ˜ȱ›ŽžŒŽȱ’—ŽŒ’˜—ȱŽ—œ’¢ȱ’—ȱ
1
2
3
Œ˜—›˜•œȱŠȱ‘ŽȱŽ›–’—Š’˜—ȱ˜ȱ‘ŽȱŽ¡™Ž›’–Ž—ǰȱ
Formalin
ŞŘǯř
96.5
---
Freshwater
64.5
ŞŖǯŘ
64.5
despite the higher mean intensity. Thus, the
reduced mortality among treatment groups
---
75.4
---
ŒŠ——˜ȱœ˜•Ž•¢ȱ‹Žȱ›Ž•ŠŽȱ˜ȱ‘ŽȱžœŽȱ˜ȱ‘’‘Ž›ȱ
H 2O 2
Œ˜—ŒŽ—›Š’˜—œȱ˜ȱ˜›–Š•’—ȱŠ—ȱ‘¢›˜Ž—ȱ™Ž›˜¡’Žȱ˜›ȱ•˜—Ž›ȱ›Žœ‘ ŠŽ›ȱ‹Š‘œȱ’—ȱ¡™ǯȱŘǰȱŠœȱ
‘’•ŽȱŠ••ȱ›ŽŠ–Ž—œȱœ‘˜ ŽȱŽŸ’Ž—ŒŽȱ˜ȱŽ-
•Š›Ž›ȱ꜑ȱŠ—ȱ’쎛Ž—ŒŽœȱ’—ȱŒ‘Š••Ž—Žȱ•ŽŸŽ•œȱ
ꌊŒ¢ǰȱ‘Žȱ›Ž•Š’ŸŽȱ™Ž›ŒŽ—ȱŽĜŒŠŒ¢ȱǻǼȱ Šœȱ
›ŽŠŽœȱ˜›ȱ˜›–Š•’—ȱ’—ȱ‹˜‘ȱŽ¡™Ž›’–Ž—œǰȱ˜•-
Ž›Žȱ•’”Ž•¢ȱŒ˜—›’‹ž’—ȱŠŒ˜›œǯȱ‘Žȱ™˜œ’’ŸŽȱ
›Ž•Š’˜—œ‘’™ȱ‹Ž ŽŽ—ȱ꜑ȱœ’£ŽȱŠ—ȱ™Š›Šœ’Žȱ’—-
•˜ Žȱ‹¢ȱ›Žœ‘ ŠŽ›ȱǻŠ‹•ŽȱřǼǯȱ
Ž—œ’¢ȱ Šœȱœ’–’•Š›ȱ˜ȱ‘Šȱœ‘˜ —ȱŽŠ›•’Ž›ȱ˜›ȱ
œŠ•–˜—ȱ’—ŽŒŽȱ ’‘ȱGyrodactylus salaris (Bakke
Discussion
and MacKenzie, 1993).
˜‘Š‹’Š’˜—ȱ ’‘ȱ’—ŽŒŽȱ꜑ȱ ŠœȱŠȱ›Ž™›˜žŒ’‹•Žȱ–Ž‘˜ȱ˜›ȱŽœŠ‹•’œ‘’—ȱGyrodactylus
Š‘ȱ›ŽŠ–Ž—œȱ ’‘ȱ˜›–Š•’—ǰȱ›Žœ‘ ŠŽ›ȱ˜›ȱ
cortiȱ’—ŽŒ’˜—œȱ’—ȱ—ŠÊŸŽȱ ˜•ȬŽŽ•œǯȱ‘Žȱ’—ŽŒ-
hydrogen peroxide (H2O2) administered three
tions were associated with mortality among
’–Žœȱ˜ŸŽ›ȱ꟎ȱŠ¢œȱ›ŽžŒŽȱ‘Žȱ’—Ž—œ’¢ȱ˜ȱ
‘Žȱ—ŠÊŸŽȱŒ˜‘Š‹’Š—œȱ ‘’Œ‘ȱ‹ŽŠ—ȱ’—ȱœŽŠ ŠŽ›ȱ
’—ŽŒ’˜—œȱ ’‘ȱG. corti and associated mortality
Œ˜—›˜•œȱ‹Ž ŽŽ—ȱŗȱŠ—ȱŝȱŠ¢œȱ˜••˜ ’—ȱ‘Žȱ
˜—œŽȱ˜ȱŽŠŒ‘ȱŽ¡™Ž›’–Ž—ȱŠ—ȱŽœŠ‹•’œ‘Žȱ‘Žȱ
‹Šœ’œȱŠŠ’—œȱ ‘’Œ‘ȱ›ŽŠ–Ž—ȱŽĜŒŠŒ¢ȱ ŠœȱŠœ-
˜ȱ ˜•ȬŽŽ•œǯȱȱ‘Žȱ‘›ŽŽȱ–Ž‘˜œǰȱ˜›–Š•’—ȱ Šœȱ
–˜œȱŽĜŒŠŒ’˜žœDZȱ‘Žȱ›Ž•Š’ŸŽȱ™Ž›ŒŽ—ȱŽĜŒŠŒ¢ȱ
sessed. Reduced respiratory capacity resulting
(Table 3) and this treatment consistently elimi-
›˜–ȱ’—ŽŒ’˜—œȱ˜—ȱ‘Žȱ’••œȱŠ—ȱ‘ŽȱŠœœ˜Œ’ŠŽȱ
nated detectable parasites. Formalin treatments
pathology likely contributed to the mortality.
‘ŠŸŽȱ‹ŽŽ—ȱœ‘˜ —ȱ˜ȱŽ•’–’—ŠŽȱ’—ŽŒ’˜—œȱ ’‘ȱ
Žœ™’Žȱ‘ŽȱŒ˜—œ’œŽ—Œ¢ȱ˜ȱ’—ŽŒ’˜—ǰȱŒ˜‘Š‹’Š—ȱ
challenges provided limited control over the
Gyrodactylus spp. in laboratory or aquarium
™˜™ž•Š’˜—œȱ˜ȱœŠ•–˜—’ȱŠ—ȱ—˜—ȬœŠ•–˜—’ȱ
•ŽŸŽ•ȱ˜ȱ™Š›Šœ’ŽȱŽ¡™˜œž›Žȱ˜ȱ‘Žȱ—ŠÊŸŽȱ ˜•Ȭ
꜑Žœǰȱ‹˜‘ȱ’—ȱ›Žœ‘ ŠŽ›ȱŠ—ȱ’—ȱœŽŠȱ ŠŽ›ȱǻž-
eels resulting in variations in challenge levels
chmann and Kristensson, 2003; Williams et
among the experiments. These variations were
Š•ǯǰȱŘŖŖŞǼǯȱ —ȱŒ˜—›Šœǰȱ‘ŽȱŽĜŒŠŒ¢ȱ˜ȱ˜›–Š•’—ȱ
ŒŠžœŽȱ‹¢ȱ’쎛Ž—ŒŽœȱ’—ȱ‘Žȱ—ž–‹Ž›ȱ˜ȱ’—ŽŒŽȱ
Œ˜‘Š‹’Š—œȱ˜›ȱ’—ȱ‘Žȱ’—Ž—œ’’Žœȱ˜ȱ’—ŽŒ’˜—œȱ˜—ȱ
Šœȱ•˜ ȱ˜›ȱ˜ȱ•’–’Žȱž›Š’˜—ȱ˜›ȱ’—ŽŒ’˜—œȱ’—ȱ
Š›–Žȱ™˜™ž•Š’˜—œȱǻ’—Š–§”’Ȭ ’——ž—Ž—ȱŠ—ȱ
‘Žȱœ˜ž›ŒŽȱ꜑ǯȱȱ•˜ Ž›ȱŒ˜‘Š‹’Š’˜—ȱŒ‘Š••Ž—Žȱ
Valtonen, 1996; Buchmann and Kristensson,
•ŽŸŽ•ȱ’—ȱ¡™ǯȱŘȱ–Š¢ȱŽ¡™•Š’—ȱœŽŸŽ›Š•ȱŽŠž›Žœȱ
2003; Rowland et al., 2006; Jørgensen et al., 2009).
˜ȱ‘Žȱ›Žœž•’—ȱ’—ŽŒ’˜—ȱ’—Œ•ž’—ȱ‘Žȱ•˜ Ž›ȱ
pre-treatment mean intensity, the lower control
–˜›Š•’¢ǰȱ‘ŽȱŝȬŠ¢ȱŽ•Š¢ȱ’—ȱ˜—œŽȱ˜ȱŒ˜—›˜•ȱ
Ž—ȱŠ—ȱŽ—ȱǻŗşşŘǼȱ›Ž™˜›Žȱ™Š›’Š•ȱŽĜŒŠŒ¢ȱ
˜ȱ˜›–Š•’—ȱŠŠ’—œȱŠ—˜‘Ž›ȱ–˜—˜Ž—ŽŠ—ȱHaliotrema spp., on golden snapper (Lutjanus johni)
mortality (compared with a 2-day delay in Exp.
–Š’—Š’—Žȱ’—ȱŠ—”œǯȱ‘Žȱ›Ž•Š’ŸŽ•¢ȱ•˜ ȱŽĜŒŠŒ¢ȱ
ǻǼȱ’—ȱŽ¡™Ž›’–Ž—œȱŗȱŠ—ȱŘȱŽ¡ŒŽŽŽȱŞŘƖȱ
Bull. Eur. Ass. Fish Pathol., 35(2) 2015, 71
˜ȱ˜›–Š•’—ȱ˜‹œŽ›ŸŽȱ’—ȱ—Šž›Š•ȱŽ—Ÿ’›˜—–Ž—œȱ
–Š¢ȱ›Žœž•ȱ›˜–ȱŒ‘Š—Žœȱ’—ȱ‘ŽȱŽěŽŒ’ŸŽȱŒ˜—ŒŽ—-
tanks (Rach et al., 2000; Bowker et al., 2012).
In another study, Gyrodactylus sp. remained
›Š’˜—œȱŒŠžœŽȱ‹¢ȱ‘Žȱ™›˜™Ž›’Žœȱ˜ȱ‘Žȱ ŠŽ›ȱ
Š—ȱ‘ŽȱœŽ—œ’’Ÿ’¢ȱ˜ȱ‘Žȱ™Š›Šœ’Žȱœ™ŽŒ’Žœǯȱ
present on green swordtails (’™‘˜™‘˜›žœȱ‘Ž••Ž›’’)
˜••˜ ’—ȱ
O2ȱŽ¡™˜œž›Žœȱ’—ȱ›Žœ‘ ŠŽ›ȱŠšžŠ›’Šȱ
2
ǻžœœ˜ȱŽȱŠ•ǯǰȱŘŖŖŝǼǯȱ‘Ž›ŽȱŠ›Žȱ—˜ȱ›ŽŒ˜›œȱ˜ȱ
O2
2
Ž•Š’ŸŽ•¢ȱ‹›’Žȱ›Žœ‘ ŠŽ›ȱ‹Š‘œȱ˜›ȱŠȱ™›˜•˜—Žȱ
Ž¡™˜œž›Žȱ˜ȱŽŒ›ŽŠœ’—ȱœŠ•’—’¢ȱ Šœȱ˜ȱ’—Ž›-
being used to treat Gyrodactylus sp. in seawater,
‘˜ ŽŸŽ›ȱ‘ŽȱŽĜŒŠŒ¢ȱ˜ȱ‘’œȱŒ˜–™˜ž—ȱŠŠ’—œȱ
–Ž’ŠŽȱŽĜŒŠŒ¢ȱ ’‘ȱȱŸŠ•žŽœȱ˜ȱŜśƖȱŠ—ȱ
Šž•ȱŠ—ȱ™›ŽȬŠž•ȱœŠŽœȱ˜ȱ™Š›Šœ’’ŒȱŒ˜™Ž™˜œȱ
ŞŖƖȱŠ–˜—ȱ‘ŽȱŽ¡™Ž›’–Ž—œǰȱŠ—ȱ–˜œȱ꜑ȱ
(sea lice, Lepeophtheirus salmonis or Caligus rog-
›Ž–Š’—Žȱ’—ŽŒŽȱ˜••˜ ’—ȱ›ŽŠ–Ž—œǯȱ —ȱ˜ž›ȱ
ercresseyi) has been documented (Treasurer and
experiments, the total cumulative mortality in
Grant, 1997; Bravo et al., 2010). Future advances
‘Žȱ›Žœ‘ ŠŽ›Ȭ›ŽŠŽȱ›˜ž™œȱ Šœȱ‹Ž ŽŽ—ȱ
‘˜œŽȱ˜ȱ˜›–Š•’—ȱŠ—ȱ 2O2, and mortality only
–Š¢ȱ‹Ž—Žęȱ›˜–ȱ‘ŽȱŽ¡Š–’—Š’˜—ȱ˜ȱ›Š—žlar sodium percarbonate, which dissociates
stabilised during exposure to brackish water
into hydrogen peroxide in water, as a possible
˜—ŒŽȱœŠ•’—’¢ȱ‘ŠȱŠ••Ž—ȱ‹Ž•˜ ȱŠ™™›˜¡’–ŠŽ•¢ȱ
treatment against marine gyrodactylids (see
Řśȱ™™ǯȱ‘Ž›ŽȱŠ›ŽȱŽ ȱ›Ž™˜›œȱ˜ȱ‘ŽȱŽĜŒŠŒ¢ȱ
Buchmann and Kristensson, 2003).
˜ȱ›Žœ‘ ŠŽ›ȱ›ŽŠ–Ž—œȱŠŠ’—œȱ–˜—˜Ž—ŽŠ—ȱ™Š›Šœ’Žœȱ˜ȱ–Š›’—Žȱ꜑ŽœȱŠ—ȱ›Žœ‘ ŠŽ›ȱ
’œȱ—˜ȱ•’œŽȱŠœȱŠ—ȱ˜™’˜—ȱ˜›ȱ‘Žȱ›ŽŠ–Ž—ȱ˜ȱ
¢›˜ŠŒ¢•’ȱ’—ŽŒ’˜—œȱǻŒ‘Ž•”•ŽȱŽȱŠ•ǯǰȱŘŖŖşǼȱ
•’”Ž•¢ȱ‹ŽŒŠžœŽȱ‘Žȱ–Š“˜›’¢ȱ˜ȱ•’œŽȱŒŠœŽœȱŠ›Žȱ
›˜–ȱ›Žœ‘ ŠŽ›ȱ꜑Žœǯȱ ˜ ŽŸŽ›ǰȱ¢›˜ŠŒ¢loses are problematic in marine aquaria and
The present study emphasised the challenges
˜ȱŽ›Š’ŒŠ’—ȱ¢›˜ŠŒ¢•’ȱ™Š›Šœ’Žœȱ›˜–ȱŠ—ȱ
’—ŽŒŽȱŒŠ™’ŸŽȱ™˜™ž•Š’˜—ǯȱ•‘˜ž‘ȱ˜›–Š•’—ȱ Šœȱ‘Žȱ–˜œȱŽĜŒŠŒ’˜žœȱŒ˜–™˜ž—ȱŽœŽȱ
–Š›’Œž•ž›ŽǰȱŠ—ȱŠȱ꟎ȱ–’—žŽȱ›Žœ‘ ŠŽ›ȱ‹Š‘ȱ
in this research, continued research into the
œž’Š‹’•’¢ȱ˜ȱ˜›–Š•’—ȱŠœȱŠȱ›ŽŠ–Ž—ȱ˜™’˜—ȱ’œȱ
not advised given its toxicological, allergenic
Šœȱ’—ŽěŽŒ’ŸŽȱŠȱ›Ž–˜Ÿ’—ȱGyrodactylus pis-
and carcinogenic properties (Schelkle et al.,
culentusȱ›˜–ȱ—˜›‘Ž›—ȱ™’™Žęœ‘ȱǻSyngnathus
2009). Alternatively, research into hypo-osmotic
fuscusǼȱǻ’••’Š–œȱŽȱŠ•ǯǰȱŘŖŖŞǼǯȱ —ȱŠ—˜‘Ž›ȱœž¢ǰȱ
›ŽŠ–Ž—ȱ˜™’˜—œȱŠ™™ŽŠ›ȱ–˜œȱŽŠœ’‹•ŽȱŠ—ȱ
‘Žȱ’—Ž—œ’¢ȱ˜ȱHaliotrema sp. was reduced on
˜•Ž—ȱœ—Š™™Ž›ȱ˜••˜ ’—ȱŠȱřŖȬ–’—ȱ›Žœ‘ ŠŽ›ȱ
promising, possibly in combination with oxi-
bath (Seng and Seng, 1992). Those studies also
˜ž—ȱ‘Šȱ›Žœ‘ ŠŽ›ȱ ŠœȱŒ˜—œ’œŽ—•¢ȱ•Žœœȱ
ŽĜŒŠŒ’˜žœȱ‘Š—ȱ˜›–Š•’—ǯȱ
—ȱ‘Žȱ™›ŽœŽ—ȱœž¢ǰȱ‘ŽȱŽĜŒŠŒ¢ȱ˜ȱ
O2 was
2
dizing agents such as sodium percarbonate. In
Š’’˜—ȱ˜ȱ›ŽŠ–Ž—ȱ˜™’˜—œȱ˜›ȱG. corti, it is
›ŽŒ˜––Ž—Žȱ‘ŠȱŽě˜›œȱ˜ȱ–Š’—Š’—ȱŒŠ™’ŸŽȱ
˜•ȬŽŽ•ȱ™˜™ž•Š’˜—œȱ’—Œ˜›™˜›ŠŽȱœ›’—Ž—ȱšžŠ›antine and screening practises whenever wild
꜑ȱŠ›Žȱ’—›˜žŒŽǯȱ
Žšž’Ÿ˜ŒŠ•ȱ ’‘ȱŠ—ȱȱ’—ȱ¡™ǯȱŘȱ˜ȱŝśƖȱȱ
‘Ž›ŽŠœȱ’—ȱ¡™ǯȱŗǰȱ’—ŽŒ’˜—ȱŽ—œ’’Žœȱ’—ȱ›ŽŠŽȱ
Acknowledgments
꜑ȱ Ž›Žȱ‘’‘Ž›ȱ‘Š—ȱ’—ȱŒ˜—›˜•œǯȱ’–’•Š›ȱŸŠ›’Š‹’•’¢ȱ’—ȱŽĜŒŠŒ¢ȱ˜ȱ 2O2 against Gyrodactylus
œ™™ǯȱ‘Šœȱ‹ŽŽ—ȱ›Ž™˜›Žȱ˜›ȱ›Žœ‘ ŠŽ›Ȭ›ŽŠ›Žȱ
ž—’—ȱ˜›ȱ‘’œȱ ˜›”ȱ Šœȱ™›˜Ÿ’Žȱ‹¢ȱ‘Žȱ
rainbow trout (Oncorhynchus mykiss) held in
Canada. The authors acknowledge the techni-
Aquaculture Collaborative Research and DeŸŽ•˜™–Ž—ȱ›˜›Š–ȱ˜ȱ’œ‘Ž›’ŽœȱŠ—ȱŒŽŠ—œȱ
72, Bull. Eur. Ass. Fish Pathol., 35(2) 2015
ŒŠ•ȱœž™™˜›ȱ˜ȱ Ž——ŠȱŠ•˜ěȱŠ—ȱ Š—’ŒŽȱŠ”Žœǯ
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Œ˜Ĵ’œ‘ȱŠ—ȱ˜› Ž’Š—ȱœ˜Œ”œȱ˜ȱ•Š—’Œȱ
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ĜŒŠŒ¢ȱ˜ȱřśƖȱȬ ȱǻ‘¢›˜Ž—ȱ
™Ž›˜¡’ŽǼȱ ’—ȱ ›ŽžŒ’—ȱ Š—ȱ ’—ŽœŠ’˜—ȱ ˜ȱ
Gyrodactylus salmonisȱ’—ȱ›Žœ‘ ŠŽ›Ȭ›ŽŠ›Žȱ
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ǻŘŖŗŖǼǯȱ쎌’ŸŽ—Žœœȱ˜ȱ‘¢›˜Ž—ȱ™Ž›˜¡’Žȱ
’—ȱ‘ŽȱŒ˜—›˜•ȱ˜ȱCaligus rogercresseyi in Chile
Š—ȱ’–™•’ŒŠ’˜—œȱ˜›ȱœŽŠȱ•˜žœŽȱ–Š—ŠŽ–Ž—ǯȱ
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’ŒŠŒ¢ȱ ˜ȱ œ˜’ž–ȱ ™Ž›ŒŠ›‹˜—ŠŽȱ Š—ȱ
˜›–Š•Ž‘¢Žȱ ‹Š‘ȱ ›ŽŠ–Ž—œȱ ŠŠ’—œȱ
Gyrodactylus derjaviniȱ ’—ŽœŠ’˜—œȱ ˜ȱ
rainbow trout. North American Journal of
Aquaculture 65, 25-27.
Jørgensen TR, Larsen TB and Buchmann K
ǻŘŖŖşǼǯȱŠ›Šœ’Žȱ’—ŽŒ’˜—œȱ’—ȱ›ŽŒ’›Œž•ŠŽȱ
rainbow trout (Oncorhynchus mykissǼȱŠ›–œǯȱ
Aquaculture 289, 91-94.
King SD, Cone DK, Gilmore SR, Jones SRM and
‹‹˜ĴȱȱǻŘŖŗŚǼǯȱž™™•Ž–Ž—Š•ȱŽœŒ›’™’˜—ȱ
Š—ȱ™‘¢•˜Ž—Ž’Œȱ™•ŠŒŽ–Ž—ȱ˜ȱGyrodactylus
corti (Monogenea: Gyrodactylidae)
™Š›Šœ’’£’—ȱŒŠ™’ŸŽȱ ˜•ȬŽŽ•ȱAnarrhichthys
ocellatus in British Columbia. Comparative
Parasitology 81, 225-231.
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˜—ȱ –˜—˜Ž—Ž’Œȱ ›Ž–Š˜Žœȱ ǯȱ
¢›˜ŠŒ¢•’ȱ™Š›Šœ’Žœȱ˜ȱ’–™˜›Š—ŒŽȱ˜ȱ
Š•’˜›—’Šȱ꜑ŽœǯȱCalifornia Fish and Game
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ĜŒŠŒ¢ȱ˜ȱ‘¢›˜Ž—ȱ™Ž›˜¡’Žȱ˜ȱŒ˜—›˜•ȱ
™Š›Šœ’’Œȱ’—ŽœŠ’˜—œȱ˜—ȱ‘ŠŒ‘Ž›¢Ȭ›ŽŠ›Žȱ
꜑ǯȱJournal of Aquatic Animal Health 12,
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Finnish salmon resistant to Gyrodactylus
salarisDZȱ Šȱ •˜—ȬŽ›–ȱ œž¢ȱ Šȱ ꜑ȱ Š›–œǯȱ
International Journal for Parasitology 26,
723-732.
˜ •Š—ȱ ǰȱ ’¡˜—ȱ ǰȱ Š—˜œȱ ǰȱ ’œžȱ
ǰȱŽŠȱȱŠ—ȱ˜¢ȱȱǻŘŖŖŜǼǯȱ쎌œȱ˜ȱ
˜›–Š•’—ȱ˜—ȱ ŠŽ›ȱšžŠ•’¢ȱŠ—ȱ™Š›Šœ’’Œȱ
monogeneans on silver perch (Bidyanus
bidyanus Mitchell) in earthen ponds.
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›Ž•’–’—Š›¢ȱ’—ŸŽœ’Š’˜—œȱ˜ȱ‘¢›˜Ž—ȱ
™Ž›˜¡’Žȱ›ŽŠ–Ž—ȱ˜ȱœŽ•ŽŒŽȱ˜›—Š–Ž—Š•ȱ
꜑ŽœȱŠ—ȱŽĜŒŠŒ¢ȱŠŠ’—œȱŽ¡Ž›—Š•ȱ‹ŠŒŽ›’Šȱ
and parasites in green swordtails. Journal of
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ǻŘŖŖşǼǯȱ›ŽŠ–Ž—ȱ˜ȱ¢›˜ŠŒ¢•’ȱ’—ŽŒ’˜—œȱ
’—ȱ꜑ǯȱDiseases of Aquatic Organisms 86,
65-75.
Ž—ȱ ȱŠ—ȱŽ—ȱȱǻŗşşŘǼǯȱ›ŽŠ–Ž—ȱ˜ȱ
cultured golden snapper, Lutjanus johni
•˜Œ‘ǰȱ ’—ŽŒŽȱ ’‘ȱ –˜—˜Ž—ŽŠ—œǯȱ
Aquaculture 106ǰȱŗȬŞǯ
Thoney DA and Hargis Jr WJ (1991). Monogenea
ǻ•Š¢‘Ž•–’—‘ŽœǼȱŠœȱ‘Š£Š›œȱ˜›ȱ꜑ȱ’—ȱ
Œ˜—ę—Ž–Ž—ǯȱAnnual Review of Fish Diseases
1, 133-153.
›ŽŠœž›Ž›ȱ ȱŠ—ȱ ›Š—ȱȱǻŗşşŝǼǯȱ‘ŽȱŽĜŒŠŒ¢ȱ
˜ȱ‘¢›˜Ž—ȱ™Ž›˜¡’Žȱ˜›ȱ‘Žȱ›ŽŠ–Ž—ȱ
˜ȱŠ›–Žȱ•Š—’ŒȱœŠ•–˜—ȱSalmo salar L.,
’—ŽœŽȱ ’‘ȱœŽŠȱ•’ŒŽȱǻ˜™Ž™˜ŠDZȱŠ•’’ŠŽǼǯȱ
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Williams SR, Kritsky DC, Dunnigan B,
Šœ‘ȱȱŠ—ȱ •Ž’—ȱȱǻŘŖŖŞǼǯȱGyrodactylus
pisculentus sp. n. (Monogenoidea:
Gyrodactylidae) associated with mortality
˜ȱ‘Žȱ—˜›‘Ž›—ȱ™’™Žęœ‘ǰȱSyngnathus fuscus
ǻ¢——Š‘’˜›–ŽœDZȱ¢——Š‘’ŠŽǼȱŠȱ‘Žȱ
Woods Hole Science Aquarium. Folia
Parasitologica 55, 265-269.
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