Impact of Pollution on Productivity and Fisheries of Fisheries of Lake Mariut, Egypt

Khalil, Magdy T.

doi:10.21608/ejabf.1998.1621

Cited by 8 publications

(9 citation statements)

References 6 publications

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“…Therefore, the results of the present findings were also closely related with the observations of Nwachukwu et al The high count in fecal coliform population in the river might be resulted from fecal material of both human beings and animals. The same was reported by Sharma and Rajput (1996), Fatma et al (1997), Shidhu and Khulbe (1998) and Khalil (2000) that they are mainly resulted from the continuous contamination of human and animal excreta. But, according to Faust et al (1975), survival of fecal coliform was affected by many factors like interaction with metal, algal toxins, temperature, dissolved nutrients, ions, organic matters, protozoa, etc.…”

Section: Resultssupporting

confidence: 77%

Distribution Pattern of Enteropathogens in Greater Imphal Area of Imphal River, Manipur

Singh¹,

Meitei²,

Meetei³

2012

Curr World Environ

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An investigation on enteropathogens in the water of Imphal river at five different sites within greater Imphal area of Manipur was carried out as a part of water quality documentation at monthly intervals for one year. Densities of enteropathogens were found to be high during rainy season and low during summer and winter seasons. The degrees of survival for the different bacteria were influenced by various environmental factors as well as anthropogenic activities.

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Section: Resultssupporting

confidence: 77%

Distribution Pattern of Enteropathogens in Greater Imphal Area of Imphal River, Manipur

Singh¹,

Meitei²,

Meetei³

2012

Curr World Environ

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“…Meiofauna abundance at Lake Maruit was slightly lower (Mitwally, 2015), than that at the least polluted El Borollus Lake (Mitwally and Abada, 2008), indicating meiofaunal tolerance to disturbance due to its broad range of groups (Schratzberger and Warwick, 1999), rapid recolonization, and ability to migrate down the sediment (Schratzberger et al, 2000 ). The macrofaunal size fraction was dominated by broken shells and fragmented bodies of three groups after restoration (Mitwally, 2015) compared to 11-12 species before restoration (Khalil and Koussa, 2013b;Khalil et al, 2016), indicating macrofaunal sensitivity to the mechanical restoration processes. However, we excluded macrofauna and zooplankton from the current study because of the prevalence of dead macrofauna bodies and the relatively empty zooplankton samples after restoration versus Khalil and Koussa (2013a) before restoration.…”

Section: Discussionmentioning

confidence: 96%

“…Many studies have documented the long-term deterioration of water quality and heavy metals impacts on different biota prior to the restoration program (1969-2010, Table 1) (Saad, 1973;El Nabawi et al, 1987;Abd-Allah and Ali, 1994;Khalil, 1998 Khairy, 2013). However, studies after lake restoration (2011-2020) reported inconsistent results concerning water quality, eutrophication, and effects on biota (i.e., plankton, benthos, and sh) (Table 1).…”

Section: Introductionmentioning

confidence: 99%

Biota Interactions for Ecological Assessment of a Deteriorated Coastal Lake following a Brief Period of Restoration

Mitwally

Rashidy

Montagna

2023

Preprint

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The coastal lake, Maruit, was one of the most productive coastal ecosystems in Egypt until the 1960s. It experienced long-term deterioration due to continuous discharge of pollutants from Alexandria city into its basins. The Egyptian government started a restoration program in 2010 to divert pollution sources away from the lake. Samples were collected in November 2012 to assess the biological condition of Lake Maruit using parasitism and predation as biological linkages between pelagic and benthic communities. A preliminary survey of ectoparasites infesting tilapia fish was carried out during this study. Ectoparasites that were retained from 300 sampled tilapia fish were identified. Two groups of platyhelminth ectoparasites, Monogenea, Cichlidogyrus sp., and the parasitic-copepod, Ergasilus lizae, were detected. Ectoparasite Platyhelminthes infected the fish Oreochromis niloticus and O. aureus, whereas the crustacean parasitized Coptodon zillii. The parasitic prevalence was 15% and 3% for Cichlidogyrus sp., and Ergasilus lizae, respectively. Benthic biotas were similar among basins, which could indicate successful restoration. The lack of response of fish abundance to benthic biotic components indicates few direct trophic links. Phytoplankton and benthic microalgae were not the main fish diet. It was found that Halacaridae and fish data clustered, suggesting either Halacaridae are simply responding like fish or that fish are preying on them because they have a relatively large size. Unexpectedly, linear connections between the populations of biota and the parasite-infected fish were found, suggesting that parasites may control the behavior of their hosts. Organic matter concentration was the main driver of the lake ecosystem biota. While the low parasitism rate and lack of eutrophication is evidence of recovery, the low biota abundance, lack of fish and faunal diversity, and limited linkage among food web components indicate the restoration was incomplete or Lake Maruit was still suffering from degradation in 2012.

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“…The high fluctuation in the concentrations of all the measured metals may be attributed to the quality and quantity of the waste discharged into the lake via drains, especially El-Qalaa and El-Umoum Drain. In addition, some studies focused only on the Lake Main Basin, like El-Bestauy (1993), Amr et al (2005), Abaza et al (2009), and Afifi et al (2016, but others studied the fishery basin, like Khalil (1998) and El-Khatib et al (2020). However, some researchers collected water samples monthly from the lake, for example, Saad et al (1981) and El-Bestauy (1993), while others studied seasonal variations, like Khalil (1998), El-Shorbagi (2015, Ali et al (2020), andEl-Khatib et al (2020), but Afifi et al (2016) explored heavy metal concentrations of water samples collected only in the winter season.…”

Section: Long-term Changes Of Heavy Metals In Mariout Lake Watermentioning

confidence: 99%

“…In addition, some studies focused only on the Lake Main Basin, like El-Bestauy (1993), Amr et al (2005), Abaza et al (2009), and Afifi et al (2016, but others studied the fishery basin, like Khalil (1998) and El-Khatib et al (2020). However, some researchers collected water samples monthly from the lake, for example, Saad et al (1981) and El-Bestauy (1993), while others studied seasonal variations, like Khalil (1998), El-Shorbagi (2015, Ali et al (2020), andEl-Khatib et al (2020), but Afifi et al (2016) explored heavy metal concentrations of water samples collected only in the winter season. In addition, some studies determined only the concentrations of dissolved heavy metals, as in Saad et al (1981), El-Bestauy (1993), andEl-Shorbagi (2015), while others measured the total heavy metal concentrations in Mariout Lake water, like Ashmawy et al (2018), Abd Elalkhoris et al (2020, and Morsy et al (2020).…”

Section: Long-term Changes Of Heavy Metals In Mariout Lake Watermentioning

confidence: 99%

Assessment of heavy metal pollution in water and its effect on Nile tilapia (Oreochromis niloticus) in Mediterranean Lakes: a case study at Mariout Lake

et al. 2022

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Mariout Lake is one of the Northern Nile-Delta Lakes in Egypt that receives agricultural, industrial and domestic effluents through several drains. The present study aims to evaluate the levels of some heavy metals (HMs) in water and edible parts of Oreochromis niloticus in Mariout Lake, in addition to studying several pollution indices and potential human health risks. The levels of the studied HMs in water were in the order of Fe > Zn > Mn > Pb > Cu > Ni > Cd. However, results of the pollution index, that concerns the effect of individual metal, concluded that Cd and Pb in water had serious pollution effects for aquatic life, while Cu, Fe, Mn, Ni, and Zn had not any pollution effects at different locations in the lake. The indices of the composite effects of all HMs (Metal Index and Heavy Metal Pollution Index) indicated the high pollution of Mariout Lake water, which may cause adverse effects on fish and different aquatic organisms. On the other side, the bioaccumulation factors of HMs in edible parts of O. niloticus were in the order of Zn > Cd > Cu > Ni > Pb > Mn > Fe. Although the target hazard quotient for all metals was less than the non-hazardous limit (THQ < 1), the non-carcinogenic hazard index (HI = 1.24) was classified in the moderate hazard risk level (1 < HI < 10) indicating low potential adverse effects on the exposed population due to consumption of O. niloticus caught from Mariout Lake.

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Impact of Pollution on Productivity and Fisheries of Fisheries of Lake Mariut, Egypt

Cited by 8 publications

References 6 publications

Distribution Pattern of Enteropathogens in Greater Imphal Area of Imphal River, Manipur

Distribution Pattern of Enteropathogens in Greater Imphal Area of Imphal River, Manipur

Biota Interactions for Ecological Assessment of a Deteriorated Coastal Lake following a Brief Period of Restoration

Assessment of heavy metal pollution in water and its effect on Nile tilapia (Oreochromis niloticus) in Mediterranean Lakes: a case study at Mariout Lake

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