scholarly journals HELMINTH FAUNA OF MAIN COMMERCIAL FISH IN LAKE ECOSYSTEM OF THE NAROCHANSKY NATIONAL PARK (REPUBLIC OF BELARUS)

2020 ◽  
pp. 87-92
Author(s):  
Degtyarik ◽  
Poloz ◽  
Bespaliy ◽  
Slobodnitskaya ◽  
Benetskaya ◽  
...  
Keyword(s):  
National Park ◽  
Infection Intensity ◽  
Helminth Fauna ◽  
Lake Ecosystem ◽  
Intermediate Hosts ◽  
Commercial Fish ◽  
Parasitic Helminths ◽  
Level Of Invasion ◽  
Development Cycle ◽  
Acanthocephalus Lucii

The composition of the helminth fauna of the main commercial fish species in the lake ecosystem of the Narochansky National Park was determined. It is represented by 10 species of helminths having a complex development cycle with the participation of intermediate hosts, as well as 1 species of helminths (Gyrodactylus sp.), a representative of cl. Monogenea, having a direct development cycle. It was noted that the highest level of invasion was typical for larvae of trematodes Tylodelphys conifera. The greatest variety of parasitic helminths is observed in fish from lake Miastro and Naroch (7 species of helminths each). It was revealed that the most common representatives of the helminth fauna of fish inhabiting the lakes of Narochansky National Park are metacercariae of trematodes of the Diplostomum genus. They were found in fish in all water reservoirs examined. Their host spectrum was also the widest. Examination of the three-spine stickleback showed a severe damage by plerocercoids Ligula intestinalis (prevalence 92% to 98.4%, infection intensity 1–4 pairs per fish). In addition, proboscis worms Acanthocephalus lucii were found in the intestines of the three-spine stickleback. The trematode fauna of fish muscles from the Naroch lake group is rather poor and represented by three types of helminths: Rhipidocotyle illense, Paracoenogonimus ovatus and Apophallus muelingi.

scholarly journals Helminths infecting Mabuya dorsivittata (Lacertilia, Scincidae) from a high-altitude habitat in Itatiaia National Park, Rio de Janeiro State, Southeastern Brazil

2003 ◽  
Vol 63 (1) ◽  
pp. 129-132 ◽  
Author(s):  
C. F. D. Rocha ◽  
D. Vrcibradic ◽  
J. J. Vicente ◽  
M. Cunha-Barros
Keyword(s):  
High Altitude ◽  
Rio De Janeiro ◽  
National Park ◽  
Infection Intensity ◽  
Helminth Fauna ◽  
Helminth Species ◽  
Southeastern Brazil ◽  
High Altitude Area ◽  
Janeiro State

We analysed the helminth fauna associated with the lizard Mabuya dorsivittata (Scincidae) from a high-altitude area in Itatiaia National Park, Rio de Janeiro State, Brazil. Of the 16 lizards examined, 12 (75%) were infected by at least one helminth. Only two helminth species were found: Physaloptera retusa and Skrjabinodon spinosulus (Nematoda), the former with a prevalence of 68.8% and a mean infection intensity of 3.6 ± 2.8 and the latter with a prevalence of 56.3% and a mean infection intensity of 2.6 ± 2.6. The helminth fauna of the studied population of Mabuya dorsivittata was considerably poorer than those of other previously studied populations of congeners.

scholarly journals A re-evaluation of the occurrence of freshwater molluscs in the Kruger National Park

Koedoe ◽  
1998 ◽  
Vol 41 (1) ◽  
Author(s):  
K.N. De Kock ◽  
C.T. Wolmarans
Keyword(s):  
Species Diversity ◽  
National Park ◽  
Kruger National Park ◽  
Intermediate Hosts ◽  
Freshwater Molluscs ◽  
Freshwater Mollusc ◽  
Mollusc Species ◽  
Trematode Parasites

Most of the previous records of the freshwater molluscs from the Kruger National Park date back prior to and up to 1966. On account of several droughts between 1966 and 1995 it was decided to do a survey of the freshwater mollusc population in 1995 to evaluate the effect of these droughts. The traditional mollusc intermediate hosts were also screened for trematode parasites to establish whether or not they were infected. No infected molluscs were found. Eight of the 19 species reported up to 1966 were not found during the 1995 survey. Three new mollusc species were collected in 1995. The consequences of the drought are clearly visible when the species diversity found in the dams in the 1995 survey, is compared to what was previously recorded.

scholarly journals Diet and nematode infection in Proceratoprhys boiei (Anura: Cycloramphidae) from two Atlantic rainforest remnants in Southeastern Brazil

2011 ◽  
Vol 83 (4) ◽  
pp. 1303-1312 ◽  
Author(s):  
Thaís Klaion ◽  
Mauricio Almeida-gomes ◽  
Luiz E. R. Tavares ◽  
Carlos F. D. Rocha ◽  
Monique Van Sluys
Keyword(s):  
Digestive Tract ◽  
Leaf Litter ◽  
Larval Stage ◽  
Diet Composition ◽  
Infection Intensity ◽  
Nematode Species ◽  
Helminth Fauna ◽  
Atlantic Rainforest ◽  
Southeastern Brazil ◽  
Food Items

Proceratophrys boiei is an endemic cycloramphid anuran inhabiting the leaf litter of Atlantic rainforests in Southeastern Brazil. We analyzed the whole digestive tract of 38 individuals of Proceratophrys boiei collected in two Atlantic Rainforest areas in the state of Rio de Janeiro, Brazil, to study the diet composition and the helminth fauna associated with this species. The main food items in P. boiei's diet were Coleoptera, Orthoptera and Blattaria. Five nematode species were found: Aplectana delirae, Cosmocerca parva, Oxyascaris oxyascaris, Physaloptera sp. (larval stage only) and an unidentified nematode. Overall prevalence was 71% and mean infection intensity was 7.3 ± 5.8 neatodes per individual.

Gastropod intermediate hosts and transmission of Parelaphostrongylus odocoilei, a muscle-inhabiting nematode of mule deer, Odocoileus h. hemionus, in Jasper National Park, Alberta

1985 ◽  
Vol 63 (4) ◽  
pp. 928-932 ◽  
Author(s):  
W. M. Samuel ◽  
T. R. Platt ◽  
S. M. Knispel-Krause
Keyword(s):  
National Park ◽  
Mule Deer ◽  
Intermediate Hosts ◽  
Jasper National Park

Over 11 000 gastropods from Jasper National Park, Alberta, were examined (1976–1977) for larvae of Parelaphostrongylus odocoilei. Seven species of gastropods were infected: Deroceras laeve (5.3%), Zonitoides nitidus (1.5%), Euconulus fulvus (1.3%), Discus shimeki (1.2%), Zonitoides arboreus (0.8%), Vitrina limpida (0.7%), and Discus cronkhitei (0.6%). Examination of deer feces collected throughout the year (1974–1980) for first-stage larvae of P. odocoilei indicated maximum numbers were passed in March and April. All deer became infected as fawns in autumn apparently by accidently ingesting infected gastropods.

scholarly journals Anurans as Intermediate and Paratenic Hosts of Helminth Infections in the Rainforest and Derived Savanna Biotopes of Southern Nigeria

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Abigail A. Imasuen ◽  
Habibat J. Ozemoka ◽  
Martins S. O. Aisien
Keyword(s):  
National Park ◽  
Host Record ◽  
The Body ◽  
Type I ◽  
Intermediate Hosts ◽  
New Host ◽  
Helminth Infections ◽  
Derived Savanna ◽  
Tree Frogs ◽  
Paratenic Hosts

Anurans from the rainforest (Okomu National Park) and derived savanna (Agbede) locations in Nigeria were investigated for their role either as intermediate or paratenic hosts of helminth infections. A total of 269 anuran specimens (157 from the Okomu National Park and 112 from Agbede) were examined. Metacercariae of a strigeoid trematode, two nematode species, a proteocephalid cestode, and an acanthocephalan were recovered from infected hosts. Except for the strigeoid trematode, which was only recorded in the rainforest, there was no ecological dichotomy in the distribution of the larval parasites recorded. Tree frogs from the rainforest only served as second intermediate hosts for the strigeoid trematode. The two nematode larvae (type I and type II) found in the body cavity of the infected host are believed to use them as paratenic hosts. Tree frogs were the predominant intermediate hosts of the proteocephalid cestode larvae in the rainforest, whilePtychadenaandPhrynobatrachusspp. served this function in the derived savanna. The occurrence of cystacanths in the anurans from both biotopes confirms their known role as paratenic host for acanthocephalans.Afrixalus dorsalisis a new host record for the ascaridoid nematode while the finding of the strigeoid trematode, the proteocephalid cestode larvae and acanthocephalan cystacanths in the anurans investigated represents new geographical records.

Patterns and processes influencing helminth parasites of Arctic coastal communities during climate change

2017 ◽  
Vol 91 (4) ◽  
pp. 387-408 ◽  
Author(s):  
K.V. Galaktionov
Keyword(s):  
Climate Change ◽  
Climate Changes ◽  
Infection Intensity ◽  
Coastal Ecosystems ◽  
Coastal Communities ◽  
The Arctic ◽  
Helminth Parasites ◽  
Intermediate Hosts ◽  
Arctic Seas ◽  
Storm Activity

AbstractThis review analyses the scarce available data on biodiversity and transmission of helminths in Arctic coastal ecosystems and the potential impact of climate changes on them. The focus is on the helminths of seabirds, dominant parasites in coastal ecosystems. Their fauna in the Arctic is depauperate because of the lack of suitable intermediate hosts and unfavourable conditions for species with free-living larvae. An increasing proportion of crustaceans in the diet of Arctic seabirds would result in a higher infection intensity of cestodes and acanthocephalans, and may also promote the infection of seabirds with non-specific helminths. In this way, the latter may find favourable conditions for colonization of new hosts. Climate changes may alter the composition of the helminth fauna, their infection levels in hosts and ways of transmission in coastal communities. Immigration of boreal invertebrates and fish into Arctic seas may allow the circulation of helminths using them as intermediate hosts. Changing migratory routes of animals would alter the distribution of their parasites, facilitating, in particular, their trans-Arctic transfer. Prolongation of the seasonal ‘transmission window’ may increase the parasitic load on host populations. Changes in Arctic marine food webs would have an overriding influence on the helminths’ circulation. This process may be influenced by the predicted decreased of salinity in Arctic seas, increased storm activity, coastal erosion, ocean acidification, decline of Arctic ice, etc. Greater parasitological research efforts are needed to assess the influence of factors related to Arctic climate change on the transmission of helminths.

Is cestode infection intensity associated with decreased body condition in the Eurasian woodcock Scolopax rusticola?

2017 ◽  
Vol 92 (1) ◽  
pp. 42-48
Author(s):  
C. Sánchez-García ◽  
E. Harris ◽  
A.C. Deacon ◽  
R. Bray ◽  
A.N. Hoodless
Keyword(s):  
Body Condition ◽  
Infection Intensity ◽  
Major Effect ◽  
Intermediate Hosts ◽  
Fat Pad ◽  
East Anglia ◽  
Scolopax Rusticola ◽  
High Prevalence ◽  
Wintering Areas ◽  
Dietary Component

AbstractThe Eurasian woodcock Scolopax rusticola is a widespread woodland specialist and a widely harvested quarry species throughout its European wintering areas, including Britain. Woodcock are prone to cestodiasis, but prevalence levels and possible effects on body condition remain under-studied. We studied the prevalence, abundance and intensity of cestodiasis in 161 woodcock harvested in four British regions in December and January during two consecutive winters (2013/14 and 2014/15). Cestodiasis prevalence was 90%, and there was no difference in prevalence between birds harvested in Cornwall, Wessex, East Anglia and Scotland. High prevalence levels were explained by the fact that earthworms (Lumbricidae) are intermediate hosts for some cestode species and also the most important dietary component of woodcock. The distribution of cestodiasis in woodcock was aggregated, such that when using the total length of cestodes per sample to measure abundance, 65% of the birds had less than 80 cm. Cestodiasis abundance varied between sexes across regions but the intensity was not affected by region, sex, age or their interactions. The intensity of cestodiasis was positively correlated with fresh weight and pectoral mass, while no significant correlation was found with the abdominal fat pad. Our results suggest that, despite high prevalence levels and intensity of cestodiasis in woodcock, host body condition is not significantly affected and hence it is unlikely that cestodiasis has a major effect on woodcock population dynamics.

scholarly journals Assessing the Potential for Small-Scale Aquaculture in Cambodia

2018 ◽  
Author(s):  
Robert B. Richardson ◽  
Murari Suvedi
Keyword(s):  
Food Security ◽  
Household Food Security ◽  
Small Scale ◽  
Lake Ecosystem ◽  
Lake Basin ◽  
Fishing Pressure ◽  
Commercial Fish ◽  
Tonle Sap Lake ◽  
Household Food ◽  
Tonle Sap

Fisheries in Cambodia play an important role in supporting household food security and livelihoods throughout the country. Inland fisheries production is largely dependent on numerous ecosystem services, particularly the flood waters of the Tonle Sap Lake basin, which has been degraded from increased fishing pressure because of population growth and a rising demand for fish. To address the dual problem of food insecurity and overfishing, an integrated food security and climate change program involved the promotion of small-scale aquaculture through semi-intensive pond management. The objective of this study is to examine perceptions of small-scale aquaculture by participants in this program in order to assess the potential for aquaculture to contribute to household food security and conservation of the Tonle Sap Lake ecosystem. Focus group discussions and a household survey were conducted among current and previous fish farmers. Results demonstrate that most farmers continue to practice small-scale aquaculture as a means to supplement household food availability and income. Numerous barriers to adoption of small-scale aquaculture were identified, including access to water, prices of commercial fish feed, selling price of fish in markets, and concerns about profitability. Seasonal water scarcity is the most prominent challenge in promoting aquaculture technologies, so aquaculture development should be expanded in areas where there are abundant supplies of water, or where use of water storage techniques are feasible. Aquaculture technology appears to have the potential to contribute to food security, nutrition, and household income, and the expansion of the practice of small-scale aquaculture has the potential to reduce fishing pressure on the wild fisheries of the Tonle Sap Lake.

scholarly journals The helminth fauna of brown trout (Salmo trutta) from a sub-alpine lake revisited after 40 years with introduced European minnow (Phoxinus phoxinus)

2021 ◽  
Vol 41 ◽  
pp. 15-26
Author(s):  
Reidar Borgstrøm ◽  
Øyvind Hatleli Mestrand ◽  
John E. Brittain ◽  
Leif Lien
Keyword(s):  
Brown Trout ◽  
Salmo Trutta ◽  
Helminth Fauna ◽  
Helminth Species ◽  
Population Increase ◽  
Intermediate Hosts ◽  
Phoxinus Phoxinus ◽  
Piscivorous Birds ◽  
European Minnow ◽  
Brown Trout Salmo Trutta

The helminth fauna of brown trout (Salmo trutta) in the Norwegian subalpine lake, Øvre Heimdalsvatn was studied by examination of gills, eyes, body cavity, kidney, stomach, pyloric region and intestine in a total of 112 brown trout randomly sampled in June, July, and September 2011. Ten helminth species, Discocotyle sagittata, Phyllodistomum umblae, Crepidostomum farionis, C. metoecus, Diplostomum sp., Proteocephalus sp., Cyathocephalus truncatus, Dibothriocephalus ditremus, D. dendriticus, and Capillaria sp. were identified. These data were compared to data from the period 1969 to 1972, just after the first record of the European minnow (Phoxinus phoxinus) in 1969. All ten helminth species, except D. dendriticus, were also present in 1969–72. However, a few major changes in infection intensities have occurred. The cestode D. ditremus and the trematode Diplostomum sp., both with piscivorous birds as final hosts, had markedly higher relative densities (abundance) in brown trout in 2011 compared to 1969–72, while the two Crepidostomum species showed a substantial decline in relative densities. We suggest that these changes may be indirectly related to the establishment and subsequent population increase of European minnow in the lake. The abundance of minnows may have increased the food basis for the piscivorous birds, primarily mergansers and the black-throated diver that now regularly forage in the lake. In addition, there have been changes in the littoral invertebrate community, including species serving as intermediate hosts of some of the brown trout parasites.

scholarly journals PLEROCERCOIDS OF CESTODES OF THE DIPHYLLOBOTHRIUM GENUS OF SALMONIDS FROM THE LOWER AND MIDDLE OB

2019 ◽  
pp. 447-453
Author(s):  
Osipov ◽  
Abramov
Keyword(s):  
Human Health ◽  
Body Cavity ◽  
The Body ◽  
Predatory Fish ◽  
Intermediate Hosts ◽  
Visual Examination ◽  
Commercial Fish ◽  
Program Monitoring ◽  
The Third ◽  
Irtysh Basin

Since 2009, the Tyumen branch of the FGBNU “VNIRO” (“Gosrybtsentr”) has been carrying out the program “Monitoring of infection of commercial fish of the Ob-Irtysh basin with helminths dangerous to human health and carnivorous animals”. As part of the implementation of this program, in 2016–2018, a study of salmon-shaped (whitefish and pike) was conducted for the presence of plerocercoids of the genus Diphyllobothrium, which are characteristic of fish in the Ob-Irtysh basin. Freshly caught fish was taken for the study, which ensured the presence of live larvae and the differentiation of the desired plerocercoids. In this case, the method of parallel cuts of the muscles, a visual examination of the body cavity, organs located in it, and microscopy of compressed fat from the intestine was used. Two types of plerocercoids difillobotriid were found in whitefish (D. dendriticum and D. ditremum). The main carrier of these larvae is peled, other species of whitefish, although they become infected, but are secondary intermediate hosts. Comparing the infection of peled with plerocercoids, diphyllobothriide, firstly, it is necessary to point out the simultaneous parasitization of capsulated D. dendriticum and D. ditremum on the intestine (esophagus and stomach). Secondly, the prevalence of D. ditremum over D. dendriticum in terms of the extensiveness of infection. The third type difillobotriid D. latum (wide tapeworm) parasitizes only predatory fish, including pike.

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