• Journal of Aquaculture
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• v.9 no.2
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• pp.117-123
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• 1996

Two species of the copepod parasite were observed from two marine fishes in Korea. A siphonostomatoid copepod Neobrachiella incurva (Shiino, 1956) (Lernaeopodidae) and a cyclopoid copepod Peniculus ostraciontis Yamaguti 1939 (Lernaeidae) were found on the gills of Halichoeres poecilopterus and the fins of Sebastes schlegeli, respectively. The most distinct features of N. incurva are bipartite of maxillule, 2 ventro-posterior processes and conical genital process. P. ostraciontis is very distinguishable in the body shape, antenna, and fused trunk. Both species of copepods are newly observed from the Korean waters.

• Animal Systematics, Evolution and Diversity
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• v.38 no.4
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• pp.271-273
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• 2022

Parabrachiella trichiuri (Yamaguti, 1939), a copepod parasitic on the ribbonfish Trichiurus lepturus (Linnaeus, 1758), is recorded as a new record of Korean fauna. The copepod is the only known species of the family Lernaeopodidae parasitic on T. lepturus. Parabrachiella trichiuri can be differentiated from its congeners by a combination of characters: the trunk is pyriform, with two pairs of processes, the maxilla is less than half as long as the cephalothorax, and the genital process is not protruding from the margin of the trunk. This species had been assigned to different genera, such as Clavellopsis Wilson, 1915, Isobranchia Heegaard, 1947, and Neobrachiella Kabata, 1979.

• Parasites, Hosts and Diseases
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• v.61 no.3
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• pp.332-337
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• 2023

Infestations of parasites, particularly those caused by copepods and monogeneans, are a major hindrance to aquaculture and have a big negative economic impact. Sebastes schlegelii, a farmed Korean rockfish, is particularly prone to copepods and monogeneans. This study comprehended how parasitic copepods and rockfish from a farm in Tongyeong-si, Gyeongsangnam-do, Korea, are related to the monogenean trematode Microcotyle sebastis. Our research revealed that monogeneans predominated, with a rate of 98.4% and an average infection intensity of 7 per infected fish. With an average infection intensity of 4 per sick fish, the infection rate for parasitic copepods was equally considerable, coming in at 91.7%. The high co-infection rate of both parasite families, at 90.8%, is noteworthy. Furthermore, Lepeophtheirus elegans and Peniculus truncatus, 2 parasitic copepod species, were discovered to have M. sebastis eggs attached to their bodies. This demonstrates a connection between parasitic copepod infestations in farmed Korean rockfish and the monogenean trematode M. sebastis. These discoveries highlight the necessity for creating more potent parasite control methods for the aquaculture sector and shed light on the intricate relationships between various parasite species.

• Animal Systematics, Evolution and Diversity
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• v.38 no.4
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• pp.157-161
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• 2022

Parartotrogus minutus n. sp. is described as a parasite of the brittle star Ophiuroglypha kinbergi (Ljungman) from the intertidal zone on the Yellow Sea coast of Korea. The new species is characterized by a combination of morphological features that the body is small, less than 0.5 mm long, the caudal ramus is 1.73 times longer than wide, leg 3 bears three-segmented rami, and the exopod of leg 5 is armed with two setae. The new species is the third known species in the genus, following P. richardi Scott T. and Scott, A., 1893 known from European waters and P. arcticus Scott T., 1901 known from both North Atlantic and North Pacific.

• Animal Systematics, Evolution and Diversity
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• v.22 no.2
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• pp.121-125
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• 2006

Ergasilus zacconis (Yamaguti, 1936), the copepod parasite originally named as Pseudergasilus zaconnis, is redescribed based on the specimens newly collected from the freshwater fish Zacco platypus (Temminck and Schlegel) from Japan. Some errors appearing in the original description are emended. An explanation for the generic position of this species is given.

• Journal of Aquaculture
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• v.19 no.1
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• pp.19-24
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• 2006

The objective of this study was to develop an efficient control method for the Alella macrotrachelus parasitic cultured black porgy, Acanthopagrus schlegeli utilizing the superior osmoregulatory ability of the host fish. The average number of the parasites on a fish was 5 worms (all female), which were attached to the cartilage of gill filament by their bulla. Morphologically, the parasite was tripartite with each length of $1822.1{\pm}521.5{\mu}m$ for the trunk $1825.0{\pm}495.8{\mu}m$ for the cephalothorax, and $134.2{\pm}43.1$ for the bulla. In histological observations, it was found that the female parasite took gill lamellae. Damage and loss of gill lamellae by the parasite caused hemorrhage and anemia in the fish. All parasites died within 48 hours by osmotic shock of freshwater or $5{\sim}15\%_{\circ}$ seawater treatment. These results suggest that Alella macrotrachelus could be controled by hyposmotic treatment.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.25 no.4
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• pp.291-300
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• 1992

Four known species of the copepod parasite were recovered from three marine fishes of Korea. It contains redescription of three species of Acanthochondria(A. brevicorpa Yu, A. tchangi Yu and A. yui Shiino) and Anchistrotos kojimensis Do & Ho. All of these species are newly recorded from the Korean waters.

• Journal of fish pathology
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• v.11 no.2
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• pp.119-127
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• 1998

Two species of the parasitc copepods, Clavellopsis hugu (Lemaeopodidae; Siphonostomatoida) and Taeniacanthus yamagutii (Taeniacanthidae; Poecilostomatoida) from cultured Korean fish, Takifugu obscurus, is described and reported for the first time in Korea. The parasite was recovered from the buccal cavity, nose and skin. Clavellopsis hugu is easily identified by the body shape, 2nd antenna, mandible and 2nd maxillae. In female, cephalothorax flexed dorsally, second antenna biramose, mandible with serrate blade, second maxillae completely fused at base of cephalothorax. In male, cephalothorax and trunk fused into an ovoid, two pairs of maxillipeds chelate. The most distinctive features of Taeniacanthus yamagutii are terminal process of second maxilla stout, maxilliped claw with conspicuous digitiform process at base and a setiform element at the tip of each exopod spine of legs 2-4. Both parasitic copepod species are new to the Korean fauna. The korean fish, Takifugu obscurus should be considered as an additional host of this species because these parasite were recovered from the western coast of Korea (Boryung Hatchery).

• Korean Journal of Fisheries and Aquatic Sciences
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• v.26 no.3
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• pp.258-265
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• 1993

Monthly changes in the occurrence and infection levels of a parasitic copepod Acanthochondria yui(Poecilostomatoida, Chondracanthidae) on a gobiid fish Acanthogobius flavimanus were studied for a year from April 1990 to March 1991. This parasite was not found on the fish for four months from September to December. Prevalence of the parasite increased from $2.9\%$ in January to $88.9\%$ in June. Relative density and mean intensity also increased from January to June. Prevalence of A. yui increased with host size. A. flavimanus samples were never found carrying A. yui larvae of three copepodid stages(CI to CIII), although a few CIV and CV larvae were identified from April and May samples. This indicates that A. flavimanus was not the sole host of A. yui. Adult females and copepodites of A. yui were usually found in the gill arch($74.8\%$) and gill filament($80.6\%$), respectively. This suggests that copepodites select the gill filament as the most suitable place on their host A. flavimanus, and the adult females move toward the gill arch.

• Journal of fish pathology
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• v.7 no.2
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• pp.83-94
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• 1994

Bonnierilla namhaesius n, sp, is described based on the specimens recovered from the ascidians, Halocynthia roretzi Von Drasche in Namhae Islands, Korea, This is distinguished from congeners by having a combination of characters : setal formula 3, 17+1 hook, 9+1 aesthete, 5, 3, 2, 2+1 aesthete, 7+1 aesthete respectively on eight segments of antennule, II, 5 on distal segment of the second leg to fourth leg exopod, and 2, 3, I on distal margin of caudal ramus. This is the second record of the male, and first record of the copepodid in the genus Bonnierilla.