The relationship between phytoplankton and fish in nutrient-rich shallow Lake Qarun, Egypt

Napiórkowska‐Krzebietke, Agnieszka; Hussian, Abd-Ellatif M.; El-Monem, Ahmed M. Abd; El-Far, Alaa M.

doi:10.1515/ohs-2016-0045

Cited by 5 publications

(11 citation statements)

References 29 publications

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“…The highest water transparency of 150 cm, in turn, was at site 10 in spring. It was consistent with the studies conducted in 2004-2005 and in 2012 (Hussein, Amer, Gaballah, Refaat, & Abdel-Wahad, 2008;Napiórkowska-Krzebietke et al, 2016), when usually higher content of phytoplanktonic chlorophyll a was recorded in the eastern sub-region (sites 1-3) of Lake Qarun, with a clear tendency to decrease towards the western sub-region. Furthermore, high concentration of nutrients indicated hypereutrophic waters in the eastern and western sub-regions of Lake Qarun.…”

Section: Environment Variablessupporting

confidence: 91%

“…In 2003-2012, a progressive increase was in the fish and seafood catches, however, the overall fish production in Lake Qarun was relatively poor compared with the other Egyptian lakes (El-Serafy, El-Haweet, El-Ganiny, & El-Far, 2014). Concerning temporal changes, the fish catches were generally higher in the summer period, except for the middle sub-region, where they were significantly lower than in the winter period (Napiórkowska-Krzebietke et al, 2016).…”

Section: Fish Communitymentioning

confidence: 84%

“…Based on data from 2012, the highest share in the annual total catch in the eastern sub-region of this lake had tilapias, primarily benthopelagic C. zillii (57%) ( Figure 3). This fish species consume primarily planktonic diatoms and dinoflagellates (Konsowa, 2006), and its prominent dominantion corresponded well with the highest phytoplankton density in this subregion (Napiórkowska-Krzebietke et al, 2016). The share of 28% had one of the representative mullets, i.e.…”

Section: Fish Communitymentioning

confidence: 98%

“…formed 20% and 13%, respectively. In the west subregion, which was characterized by the highest total catch compared to other sub-regions (Napiórkowska-Krzebietke et al, 2016), M. cephalus dominated the fish community (60%). High share had also Solea spp.…”

Section: Fish Communitymentioning

confidence: 98%

“…Recently, the fish catches in Lake Qarun have been composed primarily of tilapias with dominant C. zillii, mullets with dominant M. cephalus, soles with dominant Solea solea (Linnaeus, 1758) and S. aegyptiaca, and anchovy with dominant Engraulis encrasicolus (Linnaeus, 1758) (Napiórkowska-Krzebietke, Hussian, Abd El-Monem, & El-Far, 2016). The other fish species, i.e.…”

Section: Introductionmentioning

confidence: 99%

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Hussian¹,

Bendary²,

Sabae³

et al. 2020

Turk. J. Fish. Aquat. Sci.

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Benthic algae and macroinvertebrates play important role in global functioning of aquatic food web. Their spatial and temporal distributions in relation to environmental variables and fish composition were the aims of this study. Both benthic groups of organisms were studied at 10 sites covering the whole area of Lake Qarun. Total of 164 algae species belonging to phyla: Cyanobacteria, Bacillariophyta, Miozoa (previously Dinophyta), Chlorophyta, Cryptophyta, Ochrophyta and Euglenozoa (previously Euglenophyta) were recorded. Macroinvertebrates communities consisted of 16 species representing phyla: Arthropoda, Annelida and Mollusca. The highest densities of benthic algae and macroinvertebrates were recorded in the middle sub-region of the lake in line with the co-domination of tilapias, mullets, soles and anchovy, whereas their lowest density at site 1 in the eastern area. The sites primarily located in the western sub-region with higher density of benthic organisms and domination of Mugil cephalus were distinctly separated from the other sites. Similar trend was in distribution of chlorophyll a content, which strongly correlated with density of benthic algae. Temporal distribution indicated higher algae density in spring and summer, and higher macroinvertebrates density in spring and autumn. The fish community' composition was spatially and temporally different and environmental variables were more similarly distributed.

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Section: Environment Variablessupporting

confidence: 91%

Section: Fish Communitymentioning

confidence: 84%

Section: Fish Communitymentioning

confidence: 98%

Section: Fish Communitymentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Untitled

Hussian¹,

Bendary²,

Sabae³

et al. 2020

Turk. J. Fish. Aquat. Sci.

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Trophic state and potential productivity assessment for Qaroun Lake using spatial techniques

Mohamed,

Khalil,

El-Zeiny

et al. 2023

Environ Monit Assess

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Qaroun Lake is one of the most important Egyptian lakes which, recently, have been exposed to severe degradation in water quality and fish productivity. In this manuscript, Carlson’s trophic state index (CTSI) was used to evaluate the trophic state, while the trophometric index (TMI) was used to assess the potential productivity of Qaroun Lake. The present study is one of the initial attempts to investigate these indices in Qaroun Lake. To achieve this work, an integrated multidisciplinary approach was adopted integrating field investigation, geographic information system, and data analysis. CTSI combines three variables of water quality: chlorophyll-a (CHL-a), total phosphorus (TP), and transparency measured by Secchi disk depth (SDD). The result of overall CTSI showed the hypereutrophic state is represented by 62% and eutrophic state is represented by 38% of the total lake’s area. Moreover, the calculated TMI indicated the average potential productivity value (PP) is 619 t. It can be concluded that the hypereutrophic is the dominant state in Qaroun Lake. The present study recommends the application of TMI model to evaluate and monitor the changes in Qaroun Lake’s potential productivity in response to the changing environmental conditions and other biological pressures (e.g., Isopoda paraside).

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