3M

5 f i B % , Sci. Rep. Hokkaido Salmon Hatchery, (45) : 57-59 (1991)[Short Paper)
New Records of the Parasitic Copepod Salmincola stellatus from Sakhalin
Taimen (Hucho perryz) in Hokkaido, with a Note on Its Attachment Site*'Kazuya NACASAWA and Shigehiko URAWA*2Salmincola stellatus is a lernaeopodid copepod parasitic on salmonids of the genus Hucho.
Markevich') described this species taken from Siberian taimen, H. taimen c=H. hucho tairnen(Pallas, 177311, f r o m a market in Vladivostok, eastern USSR. In 1986, a half century a f t e rt h a t original description, Kabata')

redescribed this copepod based on the ovigerous female

specimens discovered f r o m Sakhalin taimen, H. perryi (Brevoort, 18561, f r o m Ilokkaido, Japan.
Although S. stellatus has been frequently cited (e. g., K a b a t a 3 ' ) , there a r e virtually only two
published records and little is known a b o u t i t s geographical distribition, life history, andecology. Moreover, since H. perryi h a s been regarded as one of endangered species in J a p a n ,there a r e few chances to examine t h e parasites of this r a r e salmonid.
Recently a t o t a l of 41 H. perryi was made available f o r parasitological examination andwe obtained some d a t a on prevalence, intensity, and attachment site of S. stellatus. The knownr..

.........................

inUnlnfested i:ui............................ .:Infested

30Fig. 1. Map of Hokkaido showing collection
localities for Hucho perryi. 1, SarufutsuRiver; 2, Sarobetsu River; 3, Koetoi
Hiver; 4, Otsu Fish F a r m ; 5, Lake Toro;6, Bekanbeushi River.

35Fig. 2.

4550 55 60
65
FORK LENGTH (CM)407075Size frequency distribution of Hucho
perryi from the Sarufutsu River.

jL'&ZZ3 M . & $hlCEBX%E% 331 F*'Hokkaido Fisheries Experimental Station, 238 Hamanaka-cho, Yoichi, Hokkaido 046, J A P A N(E@+Ut!?
: ~t.&SIZw?7kEX%kFJ).

*'Hokkaido Salmon Hatchery, Fisheries Agency of J a p a n , 2-2 Nakanoshima, Toyohira-ku, Sapporo
062, J A P A N (,fi$OZrZ : 7kBEk&Z 3 C
f f $A!k%).

-57

parasites of H. perryi in J a p a n have been listed earlier4’and some of nematode parasites f r o m
our material of H. perryi have been described elsewhere. 5,Materials and Methods Forty-one H. perryi, with a fork length (FL) range f r o m 16.2 t o
73.8 cm, were taken f r o m six localities in Hokkaido (Fig. 1) : 32 f r o m the Sarufutsu River on

August 1, 1986 ; t w o f r o m the Sarobetsu River on September 27, 1980 ; one f r o m t h e Koetoi
River on September 28, 1980 ; one f r o m the Otsu Fish F a r m , Tsurui-mura, on M a y 10, 1977
(this fish had strayed t o the f a r m f r o m the Ashibetsu River, a tributary of the Kushiro
River) ; one from Lake Toro on July 10,1981 ; and three f r o m t h e Bekanbeushi River on June23, 1982 and April 23, 1983. The fish were deeply frozen or fixed ,in 10% formalin andbrought t o the laboratory. The body surface, gills, fins, buccal (oral) and branchial cavities
were examined and, when copepods were found, their attachment sites were recorded.
The scientific and English names of Hucho spp. a r e those listed by Holcik e t a L 7 ) Voucher
specimens of S. stellatus have been deposited in the National Science Museum, Tokyo (NSMTCr 10957) and additional specimens retained in the personal collection of the junior a u t h o r (S.
Urawa) .
Results and Comments Eleven (34.4%) of the 32 H. perryi f r o m the Sarufutsu River wereinfested with 1 7 adult female S. stellatus with a n intensity range of 1-3 (mean 1.5)- Theinfested fish ranged in FL from 34.8-55.2 cm (Fig. 2 ) . Also, t w o adult female S. stellatus were
found on one H. perryi f r o m the Otsu Fish F a r m . These findings constitute both the second
record of S. stellatus f r o m H. perryi in Hokkaido and the f i r s t record from wild populationsof this salmonid. However, the fish f r o m the other localities were not infested.
As t o the site of infestation, all specimens of a d u l t female S. stellatus were attached t othe walls of the buccal cavity. Of t h e 17 Sarufutsu River specimens, 11 and 6 were found near
the teeth of the roof and floor of the buccal cavity, respectively (Fig. 3 ) . No other sites suchFig. 3.

58

Distribution (solid circles) of SulmLncolu stellatm
on the roof ( A ) a n d floor (a) of the buccal cavityof Hucho perryi from the Sarufutsu River.

a$the body surface,fins,gills,and branchial cavity werestellatus showsWhena site preference

Thus, adultfemale S.

to the buccal cavity, not to the skin aS reported byKabata2@S. stellatus was originally described, the attachmentinfested.

site was recorded

a$ unknown15.

1n addition,although Kabata21 reported that his material was obtained fn "a hatchery",the hostfish wereHOkkaido

Fish

fn fact fromHatchery, andthe Sun

Piazza Aquarium,

N. Okada, Sun

Sappor0, HOkkaido

Piazza Aquarium,

et a@.45,p. 40 fo0tnote).
Acknowledgements
We are grateful to Dr. K. Ogawa,(T. Awakura,

personal communications; alsoUniversity Of TOky0, andDr. T.

see Nagasawa

Shimazu,

Nagan0‑kenJunior COllege, for supplying the material Of S. stellatus.

also due to Dr. Z. Kabata, Pacific BiologicalOceans, for assistanceandMr.

N. Okada,Sun

Station,CanadaDepartment

fn obtaining literature, and to Dr. T. Awakura,
Piazza Aquarium,for information

On

Thanksareof Fisheries andHOkkaido

Fish Hatchery,S. stellatus fn HOkkaido

References
1 ) Markevich,A.

P. (1936): Inst.

ZO01. Bio1. AN

SSR,

Ukr.

Zbirnik Prats ZO01. Mus., (17), 103‑105. (In Ukrainian).

2) Kabata, Z. (1986): Can.
3)

Kabata,J. ZO01., 64,1852‑1859.

Z. (1969): J. Fish. Res.

4) Nag‑asawa,K.,

S. Urawa,andBOardCan., 26,2987‑3041

T. Awakura(1987) : Sci. Rep.

HOkkaido

SalmonHatchery,(41), 1‑75.
5) MOravec,F. and

6) MOravec, F. and7)

HOlcik,J., K.

LargestNagasawa(1989a) : FOli0. Parasito1., 36,127‑141.

K. Nagasawa(1989b): FOlia Parasito1., 36,143‑151.

K.

Hense1, J. Nieslanik,

salmonOf theworld.

Dr.

andW.

L. Skacel (1988) : TheJunk

EurasianPub1., DOrdrecht,

huchen, Hucho

xiv+239

huchop.

北悔 道産イトウからの 寄生件カイ アシ類 SMm 而 COL SfeZZofuSの 新記録と寄生部位にっいて長澤札也

・浦

札茂彦

北海道の猿払川 ， サ n べ @yJll， 芦問山．鶴店村大津養魚場， 塘路湖および別基辺牛川で採集したイトウ4l 尾を調べ，猿払川と大津養魚場から得たイトウにヵイアシ類の―憧 ， Sa[m 而 cola atp.1Zatuso@)寄生を認最めた． これは，本寄生虫のわが国における第2 番目の記録であると同時に，北海道産野生イトウからの初の記録である ． また，本種は皮盾に寄生すると報告されていたが，寄生部位はn 腔壁であることが判明

Kaba 、8a (1986) は北海道産イトウから本種を再記載した
際，宿主の採集場所を「隅化場」とした．なお，記したが，それはサンピア
ザ 水族館 (札幌市) O@ 誤りであることをtE 摘した・

59