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Fig. 1. A in Distribution of Fish Parasites Argulus japonicus and Argulus coregoni (Crustacea: Branchiura: Argulidae) in the Lake Biwa Basin, Central Japan

Fig. 1. A map of Shiga Prefecture, central Japan, to show the distribution of Argulus japonicus (closed circles, in Lake Biwa; closed triangle, in Chirinsan-no-ike Pond) and A. coregoni (open circles) in the Lake Biwa Basin. Only large rivers are shown. Dashed lines indicate the borders of Shiga and neighboring prefectures. 1, Katayama; 2, Onoe; 3, near the mouth of the Uso River; 4, off Omi-maiko; 5, Wani-Imajuku; 6, Akanoi; 7, Shina; 8, Hiei-tsuji; 9, Chirinsan-no-ike Pond; 10, Otsu; 11, Harihata River; 12, lower Ado River; 13, Kawachidani Stream; 14, upper Ane River; 15, Oike River; 16, Kanzaki River. See Tables 1 and 2 for detailed information on the collection localities of A. japonicus and A. coregoni, respectively.

Fig. 5 in First Japanese Record of Argulus nobilis (Crustacea: Branchiura: Argulidae), an Ectoparasite of Gars of North American Origin

Fig. 5. Argulus nobilis, adult female, LBM1430006168, ethanol-preserved specimen. A, Habitus, dorsal view; B, habitus, ventral view. This specimen was collected on 17 July 1992 and photographed on 2 October 2022. Scale bar: 3 mm.

Fig. 4 in First Japanese Record of Argulus nobilis (Crustacea: Branchiura: Argulidae), an Ectoparasite of Gars of North American Origin

Fig. 4. Argulus nobilis, adult female, LBM1430006168. A, First leg, dorsal view; B, distal part of endopod of first leg, dorsal view; C, second leg, dorsal view; D, third leg, dorsal view; E, fourth leg, dorsal view. Ventral rows of plumose setae on rami of third and fourth legs not shown (D, E). Scale bars: A, C–E, 0.5 mm; B, 0.1 mm.

Fig. 1 in First Japanese Record of Argulus nobilis (Crustacea: Branchiura: Argulidae), an Ectoparasite of Gars of North American Origin

Fig. 1. Argulus nobilis, adult female, LBM1430006168. A, Habitus, dorsal view; B, habitus, ventral view. Part of the ventral surface of the thorax was damaged and eggs were seen (Fig. 1B). Scale bar: 3 mm.

Fig. 3 in First Japanese Record of Argulus nobilis (Crustacea: Branchiura: Argulidae), an Ectoparasite of Gars of North American Origin

Fig. 3. Argulus nobilis, adult female, LBM1430006168. A, First antenna (a1), second antenna (a2), and postantennal spine (pas), ventral view; B, third and apical segments of first antenna, ventral view; C, third, fourth, and apical segments of second antenna, ventral view; D, swelling bearing six naked setae on posterior margin of first segment of second antenna, ventral view; E, preoral sheath and stylet, ventral view; F, mouth tube, ventral view; G, two anterior supporting rods and marginal projections from rim of first maxilla sucker, ventral view; H, second maxilla and spinules (circled) on second and third segments, ventral view. Scale bars: A, F, H, 0.2 mm; B–E, G, 0.1 mm.

Fig. 2 in First Japanese Record of Argulus nobilis (Crustacea: Branchiura: Argulidae), an Ectoparasite of Gars of North American Origin

Fig. 2. Argulus nobilis, adult female, LBM1430006168. A, Frontal region of carapace, ventral view; B, posterior region of body, ventral view; C, respiratory areas, ventral view; D, spermathecal spines, ventral view; E, caudal ramus, ventral view. Scale bars: A, B, 0.5 mm; C, 1 mm; D, 0.2 mm; E, 0.1 mm.

Fig. 4 in Marine Fish Parasite Argulus caecus (Crustacea: Branchiura: Argulidae) Accidentally Collected from a Fixed Net Caught Squid in Northern Japan

Fig. 4. Argulus caecus, ovigerous female, NSMT-Cr 29002. A, First leg, ventral view; B, distal part of endopod of first leg, ventral view; C, second leg, ventral view; D, third leg, ventral view; E, fourth leg, ventral view. Scale bars: A, C–E, 1 mm; B, 0.1 mm.

Fig. 3 in Marine Fish Parasite Argulus caecus (Crustacea: Branchiura: Argulidae) Accidentally Collected from a Fixed Net Caught Squid in Northern Japan

Fig. 3. Argulus caecus, ovigerous female, NSMT-Cr 29002. A, Caudal rami, dorsal view; B, respiratory areas, ventral view; C, first and second antennae, ventral view; D, distal part of endopod of second antenna, ventral view; E, first maxilla, ventral view; F, supporting rods each composed of series of sclerites, ventral view; G, second maxilla, ventral view; H, terminal segment of second maxilla, dorsal view; I, serrated scale-like denticle on second segment of second maxilla, ventral view. Abbreviations: a1, first antenna; a2, second antenna; pas, postantennal spine. Scale bars: A, D, F, H, 0.2 mm; B, 2 mm; C, G, 0.5 mm; E, 1 mm; I, 0.02 mm.

Fig. 1 in Marine Fish Parasite Argulus caecus (Crustacea: Branchiura: Argulidae) Accidentally Collected from a Fixed Net Caught Squid in Northern Japan

Fig. 1. Argulus caecus, ovigerous female, freshly dead specimen, NSMT-Cr 29002. Dorsal view. Scale bar: 5 mm.

Fig. 2 in Marine Fish Parasite Argulus caecus (Crustacea: Branchiura: Argulidae) Accidentally Collected from a Fixed Net Caught Squid in Northern Japan

Fig. 2. Argulus caecus, ovigerous female, NSMT-Cr 29002. A, Habitus, dorsal view; B, habitus, ventral view; C, central part of body, ventral view. Abbreviations: as, accessory spine; fm, first maxilla; mt, mouth tube; o, ova; pms, postmaxillary spine; ps, preoral sheath; sm, second maxilla. Scale bars: A, B, 5 mm; C, 1 mm.

Fig. 4 in Redescription of Argulus mongolianus (Crustacea: Branchiura: Argulidae), an Ectoparasite of Freshwater Fishes in East Asia, with Its First Record from Japan

Fig. 4. Argulus mongolianus, adult male, NSMT-Cr 29372, from Micropterus salmoides in Lake Izunuma, Miyagi Prefecture, Japan. A, Habitus, dorsal view; B, habitus, ventral view; C, respiratory areas, ventral view; D, caudal rami, dorsal view; E, first antenna (a1), second antenna (a2), and postantennal spine (pas), ventral view; F, distal part of first antenna, ventral view; G, distal part of second antenna, ventral view; H, preoral sheath and stylet, ventral view; I, mouth tube, ventral view; J, mandible, ventral view; K, section of sucker membrane of first maxilla showing three supporting rods and maginal projections, ventral view; L, second maxilla and denticles on first, second, and third segments, ventral view. Scale bars: A, B, 1 mm; C, 0.5 mm; D, F, G, K, 0.05 mm; E, H, I, 0.1 mm; L, 0.3 mm; I, 0.03 mm.

Fig. 2 in Redescription of Argulus mongolianus (Crustacea: Branchiura: Argulidae), an Ectoparasite of Freshwater Fishes in East Asia, with Its First Record from Japan

Fig. 2. Argulus mongolianus, adult female (different specimen shown in Fig. 1), NSMT-Cr 29371, from Micropterus salmoides in Lake Izunuma, Miyagi Prefecture, Japan. A, Thorax partially covered with carapace, anterior portion of abdomen, and sympods of fourth pair of legs, dorsal view; B, respiratory areas, ventral view; C, caudal rami, dorsal view; D, first antenna (a1), second antenna (a2), and postantennal spine (pas), ventral view; E, distal part of first antenna, ventral view; F, distal part of second antenna, ventral view; G, preoral sheath and stylet, ventral view; H, mouth tube, ventral view; I, mandible, ventral view; J, part of sucker membrane of first maxilla, ventral view; K, four supporting rods and maginal projections, ventral view; L, second maxilla and denticles on first, second, and third segments, ventral view. Scale bars: A, B, 1 mm; C, G, H, 0.1 mm; D, H, J, L, 0.2 mm; E, F, K, 0.05 mm; I, 0.02 mm.

Fig. 3 in Occurrence of a Skin Parasite Argulus coregoni (Branchiura: Argulidae) on Salmonids in Mountain Streams, Central Japan, with Discussion on Its Longitudinal Distribution and Host Utilization in Rivers

Fig. 3. Mountain streams where the salmonids infected with Argulus coregoni were caught in Gifu Prefecture, central Japan. A, Main stream of the upper Maze River (locality 1 in Fig. 2); B, tributary of the Hida River (locality 2); C, tributary of the Tsukechi River (locality 3); D, tributary of the Yoshida River (locality 4); E, main stream of the Itoshiro River (locality 5); F, tributary of the Itoshiro River (locality 5); G, tributary of the Sho River (locality 6); H, main stream of the Gamada River (locality 7).

Fig. 1 in Redescription of Argulus mongolianus (Crustacea: Branchiura: Argulidae), an Ectoparasite of Freshwater Fishes in East Asia, with Its First Record from Japan

Fig. 1. Argulus mongolianus, adult female, NSMT-Cr 29369, from Micropterus salmoides in Lake Izunuma, Miyagi Prefecture, Japan. A, Habitus, dorsal view; B, habitus, ventral view. Scale bar: 2 mm.

Fig. 6 in Redescription of Argulus mongolianus (Crustacea: Branchiura: Argulidae), an Ectoparasite of Freshwater Fishes in East Asia, with Its First Record from Japan

Fig. 6. Argulus mongolianus, adult female (A and B), NSMT-Cr 29369, and adult male (C and D), NSMT-Cr 29370, from Micropterus salmoides in Lake Izunuma, Miyagi Prefecture, Japan. Ethanol-preserved specimens. A, C, Habitus, dorsal view; B, D, habitus, ventral view. The adult female and male were both collected on 2 June 2020 and photographed on 2 October 2021. Scale bars: A, 2 mm; B, 1 mm.

Fig. 2 in Occurrence of a Skin Parasite Argulus coregoni (Branchiura: Argulidae) on Salmonids in Mountain Streams, Central Japan, with Discussion on Its Longitudinal Distribution and Host Utilization in Rivers

Fig. 2. Map showing the collection localities of salmonids infect- ed with Argulus coregoni (closed circles 1–7) in rivers of Gifu Prefecture, central Japan. The collection localities of ayu, Plecoglossus altivelis altivelis, infected with A. coregoni, are also shown (open triangles 8–11). 1, Upper reaches of the Maze River; 2, tributary of the Hida River; 3, tributary of the Tsukechi River; 4, tributary of the Yoshida River; 5, the Itoshiro River; 6, tributary of the Sho River; 7, the Gamada River; 8, middle reaches of the Maze River; 9, middle reaches of the Shira River; 10. middle reaches of the Nagara River; 11, lower reaches of the Nagara River.

Fig. 1 in Occurrence of a Skin Parasite Argulus coregoni (Branchiura: Argulidae) on Salmonids in Mountain Streams, Central Japan, with Discussion on Its Longitudinal Distribution and Host Utilization in Rivers

Fig. 1. Argulus coregoni, male, NSMT-Cr 30777, from a white-spotted char, Salvelinus leucomaenis, from the Gamada River, Gifu Prefecture, ethanol-preserved specimen, A, Dorsal view; B, ventral view; C, two females infecting a white-spotted char (180 mm FL) near the left pectoral fin (from the Maze River); D, one female infecting a red-spotted masu salmon, Oncorhynchus masou ishikawae (103 mm FL), near the base of the dorsal fin (from a tributary of the Hida River); E, one female (left) and one male (right) infecting a masu salmon, O. m. masou (257 mm FL), near the left pectoral fin (from the Itoshiro River); F, one female infecting a hybrid between white-spotted char and masu salmon (165 mm FL) near the dorsal fin (from the Itoshiro River). Arrowheads indicate individuals of A. coregoni. See Fig. 2 for the locations of the rivers. Scale bars: A, B, 2 mm; C–F, 20 mm.

Fig. 3 in Redescription of Argulus mongolianus (Crustacea: Branchiura: Argulidae), an Ectoparasite of Freshwater Fishes in East Asia, with Its First Record from Japan

Fig. 3. Argulus mongolianus, adult female (different specimen shown in Fig. 1), NSMT-Cr 29371, from Micropterus salmoides in Lake Izunuma, Miyagi Prefecture, Japan. A, First leg, ventral view; B, distal part of endopod of first leg, ventral view; C, second leg, ventral view; D, third leg, ventral view; E, fourth leg, ventral view; F. natatory lobe, ventral view. Scale bars: A, C–E, 0.5 mm; B, F, 0.1 mm.

Fig. 4 in Occurrence of a Skin Parasite Argulus coregoni (Branchiura: Argulidae) on Salmonids in Mountain Streams, Central Japan, with Discussion on Its Longitudinal Distribution and Host Utilization in Rivers

Fig. 4. Distribution of 31 specimens of Argulus coregoni (closed circles) on the host's body surface. A total of 32 specimens of A. coregoni were collected, but the attachment site for one individual was not recorded.

Fig. 5 in Redescription of Argulus mongolianus (Crustacea: Branchiura: Argulidae), an Ectoparasite of Freshwater Fishes in East Asia, with Its First Record from Japan

Fig. 5. Argulus mongolianus, adult male, NSMT-Cr 29372, from Micropterus salmoides in Lake Izunuma, Miyagi Prefecture, Japan. A, First leg, ventral view; B, distal part of endopod of first leg, ventral view; C, second leg, ventral view; D, third leg, ventral view; E, fourth leg, ventral view. Scale bars: A, C–E, 0.5 mm; B, 0.1 mm.