Pennellid copepod Peniculus fistula fistula(Nordmann, 1832)(Synonym: Peniculus fistula Nordmann, 1832,Aphia ID: 745880), a worldwide distributed species, has been recovered from at least 19 teleost families. The prese...Pennellid copepod Peniculus fistula fistula(Nordmann, 1832)(Synonym: Peniculus fistula Nordmann, 1832,Aphia ID: 745880), a worldwide distributed species, has been recovered from at least 19 teleost families. The present paper reports for the first time from the Malabar coast(South India), not only the existence of a new host family, Clupeidae, hosting this parasitic copepod species(P. fistula fistula) but also their season dependent hosting. A total of 123 marine fish species, belonging to 77 genera and 38 families surveyed along the Malabar coast, only the clupeid, Anadontostoma chacunda(Hamilton, 1822) was shown to be infected by this copepod species;all the recovered(copepod) parasites were invariably found attached at the mid portion of the caudal fin lobes and lying parallel to the host body, indicating the strict site-specific parasitisation. There is a discrete seasonality in the prevalence(P<0.05) as the sign of infection was noticed during the period from September to May with relatively high prevalence during winter months(November–January). During the monsoon months(June–August), the host fish was found completely free from Peniculus infection. Interestingly, all the 229 recovered specimens(P. fistula fistula) were gravid females having paired uniserrate egg sacs with the length more than its own body length.展开更多
A new species of Proteocephalus from the fish Sinocyclocheilus grahami tingi, a subspecies endemic to Fuxian Lake in Southwest China, is described.This is the first report of cestode from this host. The new species di...A new species of Proteocephalus from the fish Sinocyclocheilus grahami tingi, a subspecies endemic to Fuxian Lake in Southwest China, is described.This is the first report of cestode from this host. The new species differs from P. exiguus, P Longicollis, P parasiluri and P. torulosus,the only other species of Proteocephalus currently reported from China, by lacking an apical sucker from P. exiguus by having 45- 108 rather than 24-54 testes per proglottis, and a maximum of 15 rather than 28 uterine diverticula,from P. longicollis by having an average of 45- 108 rather than 75-115 testes per proglottis and testes being in a single layer instead of 2 layers; and from P. torulosus by having 45-108 instead of 150 testes per proglottis and testes being in 3-4 layers; and from P. parasiluri by having 45-108 rather than 180 testes per proglottis. It resernbles P. percae,P. pollanicola, and P. thymalli in number of testes and uterine diverticula, but differs by lacking an apical sucker. Proteocephalus thymalli, like the new species, has a vagina that opens dorsally to the cirrus sac, but P thymalli slao has postovarian testes,which the new species lacks. The possible significance of parasitological examinations of the other two subspecies of S.grahami in two lakes close to Fuxian Lake is discussed in relation to host speciation and coevolution of the host-parasite system.展开更多
In this report, genetic variation and phylogeny of B. acheilognathi were analyzed based on 96 samples collected from 20 fish host species in 29 different localities by using the rDNA internal transcribed spacer （ITS...In this report, genetic variation and phylogeny of B. acheilognathi were analyzed based on 96 samples collected from 20 fish host species in 29 different localities by using the rDNA internal transcribed spacer （ITS） sequences. The ITS1 and ITS2 sequences of B. acheilognathi varied among 561-639 bp and 559-648 bp, and ten simple sequence repeat loci （microsatellites） were detected in the ITS regions, which contributed to significant sequence length variation. Phylogenetic analyses revealed 4 genetic clades （A, B, C, D） in samples with significantly different fish host spectra and geographic distribution. Clade A possessed a wide host range and geographic distribution, including all the samples ofB. acheilognathi determined in previous report. Clades B, C, and D only infected the small cyprinid fishes Opsariichthys bidens and Zacco platypus, and were limited to different locality. Interesting, Clades A and D were detected coexisting in same water body, and even in same fish host O. bidens in Danjiangkou Reservoir. The relatively higher genetic divergence and wide geographic distribution orB. acheilognathi parasitic in O. bidens indicated that O. bidens is likely to be the primary host. Sympatric occurrence of the two genetically distinct clades suggests the possibility of allopatric speciation and second encounter events.展开更多
基金The Kerala State Council for Science,Technology and Environment,Government of Kerala under contract No.(T)093/SRS/2011/CSTE,dated 25.06.2011the Department of Science and Technology,Government of India DST-SERB under contract No.EMR/2016/001163 dated 28.08.2017
文摘Pennellid copepod Peniculus fistula fistula(Nordmann, 1832)(Synonym: Peniculus fistula Nordmann, 1832,Aphia ID: 745880), a worldwide distributed species, has been recovered from at least 19 teleost families. The present paper reports for the first time from the Malabar coast(South India), not only the existence of a new host family, Clupeidae, hosting this parasitic copepod species(P. fistula fistula) but also their season dependent hosting. A total of 123 marine fish species, belonging to 77 genera and 38 families surveyed along the Malabar coast, only the clupeid, Anadontostoma chacunda(Hamilton, 1822) was shown to be infected by this copepod species;all the recovered(copepod) parasites were invariably found attached at the mid portion of the caudal fin lobes and lying parallel to the host body, indicating the strict site-specific parasitisation. There is a discrete seasonality in the prevalence(P<0.05) as the sign of infection was noticed during the period from September to May with relatively high prevalence during winter months(November–January). During the monsoon months(June–August), the host fish was found completely free from Peniculus infection. Interestingly, all the 229 recovered specimens(P. fistula fistula) were gravid females having paired uniserrate egg sacs with the length more than its own body length.
文摘A new species of Proteocephalus from the fish Sinocyclocheilus grahami tingi, a subspecies endemic to Fuxian Lake in Southwest China, is described.This is the first report of cestode from this host. The new species differs from P. exiguus, P Longicollis, P parasiluri and P. torulosus,the only other species of Proteocephalus currently reported from China, by lacking an apical sucker from P. exiguus by having 45- 108 rather than 24-54 testes per proglottis, and a maximum of 15 rather than 28 uterine diverticula,from P. longicollis by having an average of 45- 108 rather than 75-115 testes per proglottis and testes being in a single layer instead of 2 layers; and from P. torulosus by having 45-108 instead of 150 testes per proglottis and testes being in 3-4 layers; and from P. parasiluri by having 45-108 rather than 180 testes per proglottis. It resernbles P. percae,P. pollanicola, and P. thymalli in number of testes and uterine diverticula, but differs by lacking an apical sucker. Proteocephalus thymalli, like the new species, has a vagina that opens dorsally to the cirrus sac, but P thymalli slao has postovarian testes,which the new species lacks. The possible significance of parasitological examinations of the other two subspecies of S.grahami in two lakes close to Fuxian Lake is discussed in relation to host speciation and coevolution of the host-parasite system.
基金supported by the National Natural Sciences Foundation of China(31302222)the Freshwater Fisheries Research Center,CAFS Grant(2013JBFM10)the earmarked fund for China Agriculture Research System(CARS-46)
文摘In this report, genetic variation and phylogeny of B. acheilognathi were analyzed based on 96 samples collected from 20 fish host species in 29 different localities by using the rDNA internal transcribed spacer （ITS） sequences. The ITS1 and ITS2 sequences of B. acheilognathi varied among 561-639 bp and 559-648 bp, and ten simple sequence repeat loci （microsatellites） were detected in the ITS regions, which contributed to significant sequence length variation. Phylogenetic analyses revealed 4 genetic clades （A, B, C, D） in samples with significantly different fish host spectra and geographic distribution. Clade A possessed a wide host range and geographic distribution, including all the samples ofB. acheilognathi determined in previous report. Clades B, C, and D only infected the small cyprinid fishes Opsariichthys bidens and Zacco platypus, and were limited to different locality. Interesting, Clades A and D were detected coexisting in same water body, and even in same fish host O. bidens in Danjiangkou Reservoir. The relatively higher genetic divergence and wide geographic distribution orB. acheilognathi parasitic in O. bidens indicated that O. bidens is likely to be the primary host. Sympatric occurrence of the two genetically distinct clades suggests the possibility of allopatric speciation and second encounter events.
