Environmental factors affecting monogeneans parasitic on freshwater fishes

Koskivaara, M.

doi:10.1016/0169-4758(92)90069-e

Cited by 42 publications

(36 citation statements)

References 9 publications

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“…It was, however, higher when compared with records by other investigators in the rivers from the same region who reported overall parasite (Okaka and Akhigbe, 1999;Edema et al, 2008;Ekanem et al, 2011). These variations in the rate of parasitism could be attributed to abiotic and biotic conditions of the environments where the studies were carried out (Koskivaara, 1992;Thompson and Larsen, 2004). Unfavourable conditions may offset fish physiology favouring parasite infestation and invasion.…”

Section: Discussioncontrasting

confidence: 52%

“…It is important to note that even though C. anguillaris had parasite prevalence of 50.0%, its prevalence may not represent the exact prevalence of parasite in C. anguillaris in the Warri River because only two specimens of this fish species were encountered during the fish collection. The highest prevalence of parasites in S. clarias may be due to several factors which include feeding habit and diet of fish (Rolbiecki, 2006), habitat (Koskivaara, 1992), immuno-competence of the fish (Folstad and Karter, 1992), as well as the behavioural pattern of the fish. Feeding on gastropods, worms, crustaceans and detritus by S. clarias may facilitate infection by parasites (Lagrue et al, 2011).…”

Section: Discussionmentioning

confidence: 99%

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Parasitofauna of Five Freshwater Fishes in a Nigerian Freshwater Ecosystem

Ejere¹,

Aguzie²,

Ivoke³

et al. 2014

CJF

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Section: Discussioncontrasting

confidence: 52%

Section: Discussionmentioning

confidence: 99%

Parasitofauna of Five Freshwater Fishes in a Nigerian Freshwater Ecosystem

Ejere¹,

Aguzie²,

Ivoke³

et al. 2014

CJF

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“…Results from this study corroborate the results obtained by Koskivaara (1992), for whom the parasites of fishes are particularly interesting, given that both are in direct contact both with the hosts and with the environment that surrounds them, thereby promoting information about the effects of environmental conditions on the organism of the hosts.…”

Section: Discussionsupporting

confidence: 80%

Assessment of environmental quality through analysis of frequency of the black spot disease in an assemblage of fish, Guaíba lake, RS, Brazil

Flores-Lopes

Thomaz

2011

Braz. J. Biol.

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The frequency of the black spot disease caused by digenetic trematodes in fish was tested as an indicator of the quality of water in the watershed of Lake Guaíba. Samples were standardised and quarterly made using a seine net at eleven sites in the basin. A total of 53,408 individuals of 66 specimens pertaining to 22 families and 8 orders were collected and analysed. The highest frequency of the disease was found in Astyanax fasciatus. The simple Chi-Squared test applied to the species showed statistically significant frequency of occurrence for three sampled sites. Two of these sites showed the highest frequencies for two consecutive sampling periods of one year and the best levels of water quality. Results of this study suggest that the association between high frequency of infestation by a parasite that causes the black spot disease in fish, and environments with less degradation in water quality, recorded from physical, chemicals and microbiological variables, could be used as an indicator of water quality in these environments.Keywords: black spot disease, environmental quality, Astyanax fasciatus, Guaíba Lake, RS, Brazil.Avaliação da qualidade ambiental através da análise da frequência da doença dos pontos pretos em assembléias de peixes, Lago Guaíba, RS, Brasil Resumo A frequência da doença dos pontos pretos, provocada por trematódeos digenéticos em peixes, foi testada como indicador da qualidade da água na bacia hidrográfica do lago Guaíba (RS). As amostragens foram padronizadas e realizadas trimestralmente com redes do tipo picaré em onze pontos desta bacia. Foram coletados e analisados 53.408 exemplares, totalizando 66 espécies pertencentes a 22 famílias e oito ordens. A maior frequência de ocorrência da doença foi verificada em Astyanax fasciatus. Um Qui-Quadrado simples aplicado para essa espécie indicou frequência estatisticamente significativa de ocorrência da doença para três locais amostrados. Dois destes locais apresentaram as maiores frequências durante dois períodos consecutivos de um ano de amostragem e os melhores níveis de qualidade de água. Os resultados deste trabalho sugerem que a associação entre a elevada frequência de infestação pelo parasito que causa a doença dos pontos pretos e os ecossistemas com menor degradação na qualidade da água, com registros de variáveis físicas, químicas e microbiológicas, pode ser utilizada como indicador de melhor qualidade ambiental.Palavras-chave: pontos pretos, qualidade ambiental, Astyanax fasciatus, lago Guaíba, RS, Brasil.

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“…Consequently, care should be taken when transferring E. coioides to a cultured system for Epinephelus spp., as reported for Gyrodactylus salaris Malmberg on salmons (Soleng & Bakke, 1998. Seasonal fluctuations in infections of monogeneans have previously been reported (e.g., Mo, 1992;Van Damme & Ollevier, 1994;Appleby, 1996;West & Roubal, 1998 Winger et al, 2008) which were due to the different responses of the parasites to seasonal variations in complex environments (Koskivaara, 1992). Temperature has been regarded as an important factor for controlling the rates of reproduction and survival of monogeneans (Scott & Nokes, 1984;Jansen & Bakke, 1991;Bakke et al, 2007;Winger et al, 2008).…”

Section: Discussionmentioning

confidence: 86%

“…These include Dactylogyrus spp. parasitizing Rutilus rutilus (see Koskivaara, 1992), microcotylids infecting Mugil cephalus (see Ei Hafidi et al, 1998) and Polylabris mamaevi and Tetrancistrum nebulosi on Siganus fuscescens (see Yang et al, 2006), but such a relationship was often statistically insignificant. However, in the present study, there was a significant positive interspecific correlation between P. coioidesis and P. serrani on Epinephelus spp.…”

Section: Discussionmentioning

confidence: 99%

Seasonal population dynamics of the monogeneans Pseudorhabdosynochus coioidesis and P. serrani on wild versus cultured groupers in Daya Bay, South China Sea

Luo¹,

Yang

2010

Helminthologia

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SummaryIn this paper, seasonal samples of wild versus cultured groupers, Epinephelus spp., from Daya Bay, South China Sea were examined to survey the seasonality of two important species, Pseudorhabdosynochus coioidesis and P. serrani (Monogenea: Diplectanidae), and to analyze the interspecific relationships between these two parasites. Between April 2008 and January 2009, P. coioidesis and P. serrani were found to be parasitic only on E. coioides Hamilton during summer and winter in the natural waters of Daya Bay, exhibiting a high degree of host specificity, whereas they co-occurred and persisted on several species of hosts, such as E. coioides, E. bruneus Block and E. awoara Temminck & Schlegel, in an experimental polyculture pond during several seasons. E. coioides is the main host for both of these two monogenean species. The overall prevalences and mean intensities of these two parasites on polycultured Epinephelus spp. showed the same pattern of seasonal fluctuations, with the maximum values during autumn, except for the overall prevalence of P. serrani, which reached its maximum values during summer and winter and the minimum values during spring and autumn. Prevalence and mean intensity were found to be related to host size. In the wild, medium-sized fishes harboured higher infections, whereas under cultured conditions the small-sized and large-sized fishes were more heavily infected. Simultaneous infections of P. coioidesis and P. serrani were common, and there was a significant positive interspecific correlation between these two parasites.

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Environmental factors affecting monogeneans parasitic on freshwater fishes

Cited by 42 publications

References 9 publications

Parasitofauna of Five Freshwater Fishes in a Nigerian Freshwater Ecosystem

Parasitofauna of Five Freshwater Fishes in a Nigerian Freshwater Ecosystem

Assessment of environmental quality through analysis of frequency of the black spot disease in an assemblage of fish, Guaíba lake, RS, Brazil

Seasonal population dynamics of the monogeneans Pseudorhabdosynochus coioidesis and P. serrani on wild versus cultured groupers in Daya Bay, South China Sea

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