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• W2049647145 abstract "[The argulids are an economically important group of crustacean ectoparasites known to be problematic in fish farming operations from both temperate and tropical regions. Argulus japonicus was first described from Japanese fish but is now well established in many parts of the world including Europe. To aid the development of effective chemotheraputants and/or vaccines against these parasites it is essential to know exactly what these animals ingest when feeding upon their fish hosts. From past morphological studies authors have shown that these parasites use a proboscis-like mouth tube for feeding, however, until now there has been much speculation amongst authors over the diet of these animals. Live observations, histology, as well as scanning and transmission electron microscopy were used to examine the feeding apparatus and gut contents of individual larval and adult lice before and after feeding on juvenile common carp, Cyprinus carpio. Red coloration of the parasites gut after feeding was obvious, suggesting ingestion of red blood cells by the adult lice. Sections of the adult lice used for histology and TEM revealed red blood cells from the fish host within the parasites gut. Larval lice were found not to feed on blood cells because of their mouth part morphology and the lack of blood cells in their intestines. Haemorrhagic responses of the hosts skin by infection of adult lice was observed between 24 and 48 hrs post infection. All techniques provided evidence that the adult parasites are indeed obligate blood feeders. Les argulides sont un groupe de crustaces ectoparasites, economiquement importants, connus pour poser des problemes en aquaculture a la fois dans les regions temperees et tropicales. Argulus japonicus a ete decrit pour la premiere fois sur des poissons japonais, mais est maintenant bien etabli dans de nombreuses parties du monde Europe comprise. Pour aider le developpement d'une chimiotherapie effective et/ou de vaccins contre ces parasites, il est essentiel de connaitre exactement ce que ces animaux ingerent lorsqu'ils se nourrissent sur le poisson hote. Des etudes morphologiques anterieures ont montre que ces parasites utilisent un tube buccal en sorte de proboscis pour s'alimenter. Cependant, jusqu'a present, il y a eu de nombreuses speculations entre les auteurs a propos de leur regime alimentaire. Des observations sur le vivant, de l'histologie ainsi que de la microscopie electronique par transmission et balayage ont ete utilisees pour examiner l'appareil buccal et le contenu stomacal des individus larvaires et adultes avant et apres un repas sur des juveniles de carpe commune Cyprinus carpio. Une coloration rouge du tube digestif des parasites apres alimentation a ete observee, suggerant une ingestion de globules rouges par le pou adulte. L'observation histologique et par MET de coupes de poux adultes montrent la presence de globules rouges provenant du poisson hote dans le tube digestif du parasite. Les poux larvaires ne se nourrissent pas de cellules sanguines de part leur morphologie buccale et de l'absence de cellules sanguines dans leur intestin. Des reponses hemorragiques au niveau de la peau de l'hote infecte par des poux adultes ont ete observees 24 a 48 h apres l'infection. Toutes les techniques demontrent que les parasites adultes sont des hematophages obligatoires., The argulids are an economically important group of crustacean ectoparasites known to be problematic in fish farming operations from both temperate and tropical regions. Argulus japonicus was first described from Japanese fish but is now well established in many parts of the world including Europe. To aid the development of effective chemotheraputants and/or vaccines against these parasites it is essential to know exactly what these animals ingest when feeding upon their fish hosts. From past morphological studies authors have shown that these parasites use a proboscis-like mouth tube for feeding, however, until now there has been much speculation amongst authors over the diet of these animals. Live observations, histology, as well as scanning and transmission electron microscopy were used to examine the feeding apparatus and gut contents of individual larval and adult lice before and after feeding on juvenile common carp, Cyprinus carpio. Red coloration of the parasites gut after feeding was obvious, suggesting ingestion of red blood cells by the adult lice. Sections of the adult lice used for histology and TEM revealed red blood cells from the fish host within the parasites gut. Larval lice were found not to feed on blood cells because of their mouth part morphology and the lack of blood cells in their intestines. Haemorrhagic responses of the hosts skin by infection of adult lice was observed between 24 and 48 hrs post infection. All techniques provided evidence that the adult parasites are indeed obligate blood feeders. Les argulides sont un groupe de crustaces ectoparasites, economiquement importants, connus pour poser des problemes en aquaculture a la fois dans les regions temperees et tropicales. Argulus japonicus a ete decrit pour la premiere fois sur des poissons japonais, mais est maintenant bien etabli dans de nombreuses parties du monde Europe comprise. Pour aider le developpement d'une chimiotherapie effective et/ou de vaccins contre ces parasites, il est essentiel de connaitre exactement ce que ces animaux ingerent lorsqu'ils se nourrissent sur le poisson hote. Des etudes morphologiques anterieures ont montre que ces parasites utilisent un tube buccal en sorte de proboscis pour s'alimenter. Cependant, jusqu'a present, il y a eu de nombreuses speculations entre les auteurs a propos de leur regime alimentaire. Des observations sur le vivant, de l'histologie ainsi que de la microscopie electronique par transmission et balayage ont ete utilisees pour examiner l'appareil buccal et le contenu stomacal des individus larvaires et adultes avant et apres un repas sur des juveniles de carpe commune Cyprinus carpio. Une coloration rouge du tube digestif des parasites apres alimentation a ete observee, suggerant une ingestion de globules rouges par le pou adulte. L'observation histologique et par MET de coupes de poux adultes montrent la presence de globules rouges provenant du poisson hote dans le tube digestif du parasite. Les poux larvaires ne se nourrissent pas de cellules sanguines de part leur morphologie buccale et de l'absence de cellules sanguines dans leur intestin. Des reponses hemorragiques au niveau de la peau de l'hote infecte par des poux adultes ont ete observees 24 a 48 h apres l'infection. Toutes les techniques demontrent que les parasites adultes sont des hematophages obligatoires.]" @default.
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• W2049647145 title "Feeding in Adult Argulus Japonicus Thiele, 1900 (maxillopoda, Branchiura), an Ectoparasite on Fish" @default.
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