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

• Autorzy: Napiórkowska-Krzebietke A. , Hussian A. E. M. , Abd El-Monem A. M. , El-Far A. M.

Identyfikatory

DOI

10.1515/ohs-2016-0045

• Języki publikacji: EN

Abstrakty

EN

The present study focused on the determination of the baseline data and correlations between biological and physicochemical variables, including the assessment of trophic conditions in Lake Qarun. The concentrations of nutrients were high, with the maxima usually in the east subarea (total nitrogen 6.40 mg dm^-3, mineral nitrogen 2.34 mg dm^-3, orthophosphates 0.22 mg dm^-3). A total of 134 phytoplankton species were recorded. Bacillariophyceae and Dinophyceae co-dominated spatially and seasonally in phytoplankton assemblages. The highest phytoplankton density (935 × 104 cells dm^-3) and chlorophyll a content (69.3 μg dm-3) were recorded in the east subarea of the lake, whereas the largest total and dominant fish (Mugil cephalus and Solea spp.) were in the west. Tilapia zillii and Engraulis encrasicolus were most abundant in the east and in the middle part, respectively. When phytoplankton density decreased from the east toward the west subarea, the Secchi disk depth increased. The TLI-based assessment indicated hypereutrophic waters at most sites of Lake Qarun. Statistically significant positive or negative correlations were found between the dominant fish species: T. zillii and Solea spp., and the phytoplankton density, Dinophyceae density, concentrations of TP, chlorophyll a, ammonium, nitrite and nitrate. Such correlations may be helpful to better understand how to enhance the sustainable fish production.

Słowa kluczowe

EN

phytoplankton; chlorophyll a; nutrients; saline waters; fish; Egypt

• Wydawca: Institute of Oceanography University of Gdańsk
• Czasopismo: Oceanological and Hydrobiological Studies
• Rocznik: 2016
• Tom: Vol. 45, No. 4
• Strony: 539--553
• Opis fizyczny: Bibliogr. 66 poz., rys., tab., wykr.

Twórcy

autor

Napiórkowska-Krzebietke A.

• Department of Hydrobiology, Inland Fisheries Institute, ul. Oczapowskiego 10, 10-719 Olsztyn, Poland

autor

Hussian A. E. M.

• National Institute of Oceanography and Fisheries, Inland Water and Aquaculture Branch, 101 El Kasr Aini St., Cairo, Egypt

autor

Abd El-Monem A. M.

• National Institute of Oceanography and Fisheries, Inland Water and Aquaculture Branch, 101 El Kasr Aini St., Cairo, Egypt

autor

El-Far A. M.

• National Institute of Oceanography and Fisheries, Inland Water and Aquaculture Branch, 101 El Kasr Aini St., Cairo, Egypt

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Uwagi

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.