Publications

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the first report of phototaxis of fish ectoparasite, argulus japonicus.we discovered positive phototaxis in the fish ectoparasite, argulus japonicus (subclass branchiura). positive phototaxis of a. japonicus showed circadian rhythmicity. the phototaxis of a. japonicus has a unique circadian rhythm, which has been reported in no other crustacean. no phototaxis was observed at 4:00. after this time, however, a. japonicus gradually showed positive phototaxis until 16:00. there was no difference between male and female a. japonicus in this phototaxis. in addition, a. j ...200817949763
argulus japonicus: sperm transfer by means of a spermatophore on carassius auratus (l).the process of sperm transfer is somewhat enigmatic in argulus, even though copulation has been witnessed. a breeding colony of argulus japonicus was kept under laboratory conditions in order to study reproduction in the species. pairs in copula were removed and studied with histology and scanning electron microscopy to describe the mechanism of sperm transfer. sections of copulating pairs revealed sperm on the accessory copulatory structures of the male's swimming legs; and scanning electron mi ...201020493846
analysis of genetic variability within argulus japonicus from representatives of africa, middle east, and asia revealed by sequences of three mitochondrial dna genes.this study investigated the genetic variability within fish louse argulus japonicus (crustacea: branchiura) from africa, middle east, and asia by polymerase chain reaction in three mitochondrial dna (mtdna) regions, namely, cytochrome c oxidase subunit 1 (cox1) and nadh dehydrogenase subunits 1 and 4 (nad1 and nad4). six different sequences from a portion of the cox1 gene (pcox1) and a portion of the nad1 and nad4 genes (pnad1 and pnad4) for ten adult specimens from infected fish in china, egypt ...201020454804
the ultrastructure of the digestive cells of argulus japonicus, thiele 1900 (crustacea: branchiura).the ultrastructure of the cells of the digestive system of argulus japonicus is described with the use of transmission electron microscopy. specimens of argulus japonicus were collected from the vaal dam in south africa and fixed in todd's fixative. the samples were post fixed in osmium tetroxide and embedded in resin. the anterior midgut is composed mostly of r cells while the enteral diverticula are composed mainly of r cells in the proximal diverticules and of f cells in the distal diverticul ...200918678280
ultrastructure of argulus japonicus thiele, 1900 (crustacea: branchiura) collected from guangdong, china.argulus japonicus thiele, 1900 was originally described from china, but has spread to europe, africa, australia, and north america. an ultrastructural description of a. japanicus has been done as one of the most common fish ectoparasites which has a high affect on fish life. the description was based on light and scanning electron microscopes studies using 13 females and 7 males which were collected from shunde city in guangdong province, china. typical argulus body and body's appendages are ass ...200818094998
cxc chemokines and leukocyte chemotaxis in common carp (cyprinus carpio l.).cxc chemokines, structurally recognizable by the position of four conserved cysteine residues, are prominent mediators of chemotaxis. here we report a novel carp cxc chemokine obtained through homology cloning and compare it with fish orthologues genes and with a second, recently elucidated, carp cxc chemokine. phylogenetic analyses clearly show that neither cxc chemokine resembles any of the mammalian cxc chemokines in particular. however, basal expression is most prominent in immune organs lik ...200312880637
transcriptional analysis of the common carp (cyprinus carpio l.) immune response to the fish louse argulus japonicus thiele (crustacea: branchiura).in the present study we investigated changes in transcription levels of a panel of selected immune relevant genes in peripheral blood leucocytes (pbl) and skin samples collected from carp exposed to larval argulus japonicus. we show that in skin up-regulation of gene transcription of the chemokine cxca, and to a lesser extent the chemokine receptor cxcr1 and the cytokine tnfalpha, are good indicators of parasite-induced skin damage at 2 days post-parasite exposure. up-regulation of gene transcri ...200818502149
cortisol influences the host-parasite interaction between the rainbow trout (oncorhynchus mykiss) and the crustacean ectoparasite argulus japonicus.the host-parasite interaction between the rainbow trout oncorhynchus mykiss and the fish louse argulus japonicus was investigated by administering low levels of dietary cortisol before infecting the fish with low numbers of the parasite. after 24 h, the dietary cortisol treatment elevated blood cortisol and glucose levels and stimulated the synthesis of secretory granules in the upper layer of skin cells. infection with 6 lice per fish caused skin infiltration by lymphocytes, also in areas witho ...200314700191
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