Ecological status of Hout River Dam, Limpopo province, South Africa, using fish condition and health assessment index protocols: a preliminary investigation

Sara, Joseph R.; Smit, Willem J.; Erasmus, L.J.C.; Ramalepe, Tshepiso Promise; Mogashoa, M.E.; Raphahlelo, Modibe; Theron, J.; Luus‐Powell, Wilmien J.

doi:10.2989/16085914.2013.848181

Cited by 9 publications

(11 citation statements)

References 31 publications

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“…The present study and previous attempts to find gill parasites in native O. mossambicus populations (Madanire-Moyo et al 2011;Olivier et al 2009;Sara et al 2013) consistently reported the presence of parasites, with species richness ranging from one to six species (median richness: three species). In contrast, no parasite was found in the invasive host population of New Caledonia.…”

Section: Discussionsupporting

confidence: 83%

“…1; Table 1). Actually, these are the highest prevalence levels ever reported for gill monogenean parasites in native O. mossambicus populations (see Madanire-Moyo et al 2011;Sara et al 2013).…”

Section: Methodsmentioning

confidence: 95%

“…These sampling localities for the native range, Linlangalinwe (n = 23) and Macosse (n = 8), both correspond to freshwater sites (Firmat et al 2013). Given the low samples size available for these sites, we also referred to results from previous parasitological surveys for Olivier et al 2009;Sara et al 2013). For parasite collection, gill arches from the right side of each specimen were excised, stored in 90 % ethanol and carefully inspected for parasites with a stereomicroscope by a single observer (GM).…”

Section: Methodsmentioning

confidence: 99%

“…Parasites were only found in the samples from native range (see BResults^). A binomial sampling error was assumed to evaluate the probability that this observed null prevalence can reach the lowest prevalence level documented in native O. mossambicus populations taken as conservative baselines (i.e., 73.25 %, n = 157, in Madanire-Moyo et al (2011) and 47.1 %, n = 17, in Sara et al (2013)), given the sampling error associated with the number of hosts dissected in the invaded range (n = 62). This corresponds to a one-sided binomial test evaluating the alternative hypothesis that the prevalence level in New Caledonia is actually lower than the lowest prevalence reported in the native range.…”

Section: Methodsmentioning

confidence: 99%

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A case of complete loss of gill parasites in the invasive cichlid Oreochromis mossambicus

et al. 2016

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This study investigates the recent evolution of a rich parasite community associated with one of the world's most invasive species, the cichlid fish Oreochromis mossambicus. Populations from the species' native range (Mozambique) are compared to a population from New Caledonia (Wester Pacific), an island where the species was introduced in 1954. The results support the complete local extinction of the gill parasite community in the course of the invasion process. Up to six gill parasite species per locality were documented in the O. mossambicus native range, and previous surveys consistently reported at least one parasite species introduced along African cichlid species established out of Africa. The absence of parasites in New Caledonia is therefore exceptional. This can be attributed to local factors, such as a strong initial population bottleneck, the likely absence of multiple host introductions, and the frequent occurrence of brackish watersheds that might enhance the probability for natural deparasitation.

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Section: Discussionsupporting

confidence: 83%

Section: Methodsmentioning

confidence: 95%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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A case of complete loss of gill parasites in the invasive cichlid Oreochromis mossambicus

et al. 2016

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“…They concluded that the inverted parasite index, which proposes that endoparasites increase with a decrease in water quality, did not apply in their study (MadanireMoyo et al 2012b). Similar studies in the Hout River Dam, Limpopo, concluded that the dam was in good condition (Sara et al 2013). Three papers published in 2014 generated alarming results concerning the health risks to humans consuming the Mozambique tilapia Oreochromis mossambicus (Addo-Bediako et al 2014a), the rednose labeo Labeo rosae (Jooste et al 2014) and the silver catfish S. intermedius (Addo-Bediako et al 2014b); levels of different metals were too high in these fish and thus dangerous for human health.…”

Section: Aquatic Parasitology At the University Of Limpopomentioning

confidence: 96%

A brief history of freshwater fish parasitology in southern Africa

2015

African Zoology

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Linkages between pelagic and benthic biota in a deteriorated coastal lake after restoration, Maruit, Egypt

Mitwally

Rashidy

Montagna

2023

Environ Monit Assess

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Until the 1960s, Lake Maruit was one of Egypt’s most productive coastal brackish lakes. Continuous polluted discharge from Alexandria city resulted in long-term deterioration. The Egyptian government started a lake restoration program in 2010. Biological linkages between pelagic and benthic communities were assessed in November 2012 using parasitism and predation. This study examined ectoparasites infesting tilapia fish from 300 samples. The platyhelminth ectoparasite, Monogenea, and parasitic-copepod Ergasilus lizae were detected. Platyhelminthes parasitized Oreochromis niloticus and Oreochromis aureus, whereas the crustacean parasitized Coptodon zillii. The parasitic prevalence was low for Cichlidogyrus sp. and Ergasilus lizae. Benthic biotas were similar across basins. Fish abundance does not respond directly to benthic biotic components. Phytoplankton and benthic microalgae were not the main fish diet. Data on Halacaridae and fish clustered, indicating that either Halacaridae responds to their environment like fish or fish prey upon them because of their size. Linear correlations between pelagic, benthic biota, and parasite-infected fish indicate parasites may control their hosts. Some bioindicators indicate that stressed ecosystems differ from unstressed ecosystems. Fish species and biota abundances were low. Inconsistency in the food web and an absence of direct interactions between prey and predators are bioindicators of disturbed ecosystems. The low prevalence of ectoparasites and lack of heterogenous distribution of the various examined biota are bioindicators of habitat rehabilitation. Ongoing biomonitoring to better understand habitat rehabilitation is suggested.

show abstract

Ecological status of Hout River Dam, Limpopo province, South Africa, using fish condition and health assessment index protocols: a preliminary investigation

Cited by 9 publications

References 31 publications

A case of complete loss of gill parasites in the invasive cichlid Oreochromis mossambicus

A case of complete loss of gill parasites in the invasive cichlid Oreochromis mossambicus

A brief history of freshwater fish parasitology in southern Africa

Linkages between pelagic and benthic biota in a deteriorated coastal lake after restoration, Maruit, Egypt

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