The niche of the monogeneans,Dactylogyrus chenminjungae,D.curvicirrus and D.montshadskyi parasitic on gills of Culterichthys erythropterus, from Honghu Lake in Hubei province has been studied.The number of D.chenminju...The niche of the monogeneans,Dactylogyrus chenminjungae,D.curvicirrus and D.montshadskyi parasitic on gills of Culterichthys erythropterus, from Honghu Lake in Hubei province has been studied.The number of D.chenminjungae decreases successively from outer gill arch to inner gill arch.But there is no significant difference in intensity between the first gill and the second gill arch.No preference to gill arches of D.curvicirrus and D.montschadskyi has been observed.Spatial distribution patterns of the parasites indicate the effects of physical and chemical factors in microhabitat,the motility of individuals,intensity,reproductive strategy,and interspecific relationship.The niche breadth exends as the intensity increases.展开更多
Four species of Gyrodactylus from two species of fish in the family Acheilognathinae are reported in the present paper. It involves two new species and two new chinese records. All the measurements used in the decript...Four species of Gyrodactylus from two species of fish in the family Acheilognathinae are reported in the present paper. It involves two new species and two new chinese records. All the measurements used in the decriptions of new species are in millimeter. Type specimens are deposited in the Laboratory of Fish Diseases, Institute of Hydrobiology, The Chinese Academy of Sciences, Wuhan. Gyrodactylus donghuensis sp. nov.(Fig.1) Host: Rhodeus sinensis Günther Location: Gills Locality: Donghu Lake in Wuhan City of Hubei Province. Descriptions (based on 3 specimens): Body small in size, being 0.5-0.8 long and 0.09-0.107 wide. Marginal hooklets ordinarily typed, their total length 0.062-0.08, handle 0.059-0.063 and point 0.05-0.018. Total length of anchors 0.176- 0.018 . The basal portion 0.06-0.065, handle 0.13 -0.135 and point 0.085-0.0875 in length, respectively. Ventral bar 0.019-0.021×0.085-0.091 in size, ventral bar membrane 0.0155-0.02 long. Dorsal bar 0.0175-0.018×0.052-0.057 in size. Cirrus bulb absent. Remarks: The new species is similar to G. macrorhodei Ergens et Yukhimenko, 1975 in the structure of opisthohaptor, but differs in the size and chitinod structure. G. wuchangensis sp. nov.(Fig.2) Host: Rhodeus sinensis Günther Location: Gills Locality: Donghu Lake in Wuhan City of Hubei Province Descriptions (based on 4 specimens): Body small in size, being 0.18-0.24 long and 0.053- 0.072 wide. Pharynx 0.039×0.0635 in size. Marginal hooklets ordinarily typed, their total length 0.023- 0.027, handle 0.021-0.025 and point 0.0022-0.003. Total length of anchors 0.034- 0.036 . The basal portion 0.012-0.013, handle 0.0259-0.0275 and point 0.015- 0.016 in length, respectively. Ventral bar 0.003-0.006×0.014- 0.016 in size, ventral bar membrane 0.007 long. Dorsal bar 0.001 -0.002×0.0105- 0.011 in size. Cirrus bulb absent. Remarks: The new species is similar to G. rhodei Zitnan, 1964 in the structure of opisthohaptor, but differs in the size and chitinod structure. G. rhodei Zitnan, 1964.(Fig.3) Host: Acanthorhodeu展开更多
文摘The niche of the monogeneans,Dactylogyrus chenminjungae,D.curvicirrus and D.montshadskyi parasitic on gills of Culterichthys erythropterus, from Honghu Lake in Hubei province has been studied.The number of D.chenminjungae decreases successively from outer gill arch to inner gill arch.But there is no significant difference in intensity between the first gill and the second gill arch.No preference to gill arches of D.curvicirrus and D.montschadskyi has been observed.Spatial distribution patterns of the parasites indicate the effects of physical and chemical factors in microhabitat,the motility of individuals,intensity,reproductive strategy,and interspecific relationship.The niche breadth exends as the intensity increases.
文摘Four species of Gyrodactylus from two species of fish in the family Acheilognathinae are reported in the present paper. It involves two new species and two new chinese records. All the measurements used in the decriptions of new species are in millimeter. Type specimens are deposited in the Laboratory of Fish Diseases, Institute of Hydrobiology, The Chinese Academy of Sciences, Wuhan. Gyrodactylus donghuensis sp. nov.(Fig.1) Host: Rhodeus sinensis Günther Location: Gills Locality: Donghu Lake in Wuhan City of Hubei Province. Descriptions (based on 3 specimens): Body small in size, being 0.5-0.8 long and 0.09-0.107 wide. Marginal hooklets ordinarily typed, their total length 0.062-0.08, handle 0.059-0.063 and point 0.05-0.018. Total length of anchors 0.176- 0.018 . The basal portion 0.06-0.065, handle 0.13 -0.135 and point 0.085-0.0875 in length, respectively. Ventral bar 0.019-0.021×0.085-0.091 in size, ventral bar membrane 0.0155-0.02 long. Dorsal bar 0.0175-0.018×0.052-0.057 in size. Cirrus bulb absent. Remarks: The new species is similar to G. macrorhodei Ergens et Yukhimenko, 1975 in the structure of opisthohaptor, but differs in the size and chitinod structure. G. wuchangensis sp. nov.(Fig.2) Host: Rhodeus sinensis Günther Location: Gills Locality: Donghu Lake in Wuhan City of Hubei Province Descriptions (based on 4 specimens): Body small in size, being 0.18-0.24 long and 0.053- 0.072 wide. Pharynx 0.039×0.0635 in size. Marginal hooklets ordinarily typed, their total length 0.023- 0.027, handle 0.021-0.025 and point 0.0022-0.003. Total length of anchors 0.034- 0.036 . The basal portion 0.012-0.013, handle 0.0259-0.0275 and point 0.015- 0.016 in length, respectively. Ventral bar 0.003-0.006×0.014- 0.016 in size, ventral bar membrane 0.007 long. Dorsal bar 0.001 -0.002×0.0105- 0.011 in size. Cirrus bulb absent. Remarks: The new species is similar to G. rhodei Zitnan, 1964 in the structure of opisthohaptor, but differs in the size and chitinod structure. G. rhodei Zitnan, 1964.(Fig.3) Host: Acanthorhodeu
