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AFRICA [3308]
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  • Benthic assemblages for ecological evaluation of Bardawil Lagoon, Mediterranean Sea, ‎Egypt.

    El komi, Mohamed Mohamed (2019-12-31)
    Bardawil Lagoon is the only highly saline oligotrophic lagoon in Egypt, has an area of ca. ‎‎650 km2 with water depths ranged 0.3m to 3m and economically important in terms of ‎fish production. It is the optimum zone getting migratory birds in winter. It is separated ‎from the Mediterranean Sea by a narrow sandy shelf (90 km length, and 22 km width). ‎Ecological evaluation of benthic communities in Bardawil Lagoon to follow-up study of ‎the distribution of benthic study at 12 selected sampling sites representing different ‎environmental habitats for long periods through the project of Environmental Study ‎Wetlands OF North Egyptians Lakes where samples were collected seasonally (2010-‎‎2015) and semi-annually (2015 - 2019). The results and data analysis indicated that the ‎distribution, composition and dominance of macro benthic organisms in Lake Bardawil ‎were composed mainly of Ostracoda, Polychaeta, Sea grasses, Bivalvia, Insecta larvae‏ ‏communities‏ ‏and dominated the constituent of bottom fauna. The variations in the ‎benthic biomass were the heaviest at sites elRaodh and meddle elRaodh representing ‎‎1354 and 1105 g/m2 which corresponding respectively to 18.2 % and 14.9% of the ‎annual average of benthic biomass (619 g/m2). Regional variations abundance of the ‎benthic structure was highest at sites elTelol and elRaodh representing 3486 ind/m2 and ‎‎3635 ind/m2 which corresponding respectively to 14.8% and 15.3% of the annual ‎average of benthic density (1978 ind/m2). Sites of sampling study were evenly spread (J’ ‎‎> 0.8) at most sites except at elTelol and elRaodh also, high diversity (H’ > 3.00) was at ‎the most sites and show lower value at sites elTelol, elGals, Boughaz I, elNaser, and ‎Raba`a while, Swartz Dominance indexes of number of 5 species over 75% showed low ‎values at sites elGals, Boughaz I, elNaser, and Raba`a. The abiotic environmental effects ‎in the Bardawil Lagoon are general to those generally observed in other areas influenced ‎by organic wastes, namely, changed in the physic-chemical properties of the sediments ‎and low oxygen concentrations in the bottom water due to decomposition of organic ‎materials.‎
  • Biometric properties of euryhaline fish the sand smelt Atherina boyeri Risso, ‎‎1810‎.

    Benzer, Semra (2019-06-30)
    In this study the presence of sand smelt Atherina boyeri Risso, 1810, an invasive and ‎translocated species has been reported in the Hirfanlı Dam Lake, Turkey. The fish ‎samples were collected from the fishermen operating in the area in April 2016. Twenty-‎three morphometric characteristics of A. boyeri, were taken, including standard length ‎‎(SL), fork length (FL), total length (TL), preorbital distance, eye diameter, interorbital ‎distance, head length, head width, dorsal fin I nose point distance, dorsal fin II nose ‎point distance, preanal distance, prepectoral distance, preventral distance, dorsal fin I ‎base length, dorsal fin II base length, anal fin base length, pectoral fin base length, ‎ventral fin base length, maximum body height, caudal peduncle height, body width, ‎caudal peduncle width, body weight (W). The SL varied between 62 to 75 mm and ‎weight 2.324 to 4.133 g in females. Whereas in males the SL varied between 56 to78 mm ‎and weight 1.533 to 4.011 g. The sex ratio was slightly in favour of females being 54.4%‎
  • Feeding habits of pick handle barracuda (Sphyraena jello) Cuvier, 1829 along the coast ‎of Pakistan‎.

    Manzoor, Hina; Zohra, Kashifa; Osmany, Hamid Badar (2019-06-30)
    A one year combined study of both sexes was conducted from March 2017 to February ‎‎2018 to investigate the feeding habit of Pick handle Barracuda (Sphyraena jello) Cuvier, ‎‎1829 locally called as Safaid kund along the coast of Pakistan, a large species found in ‎Pakistani water caught mainly by bottom set gillnet throughout the year. Samples ‎studied at Karachi fish harbor, in commercial catch which is the major landing center of ‎Pakistan. During this counting method was applied with naked eye. Mostly fishes ‎characterized by 91.66%, cephalopod 5.66% and shrimp 2.78% made the highest and ‎lowest stomach content respectively shoes carnivorous behavior of the species. ‎
  • Determination of mercury (Hg) in two sea cucumber species Ohshimella ehrenbergii ‎‎(Selenka, 1868) and Stolus buccalis (Stimpson, 1855) from the Karachi ‎coast.

    Ahmed, Quratulan; Bat‎, Levent; Ali, Qadeer Mohammad (2019-06-30)
    In this study the amounts of mercury (Hg) were determined in tentacles and muscle ‎tissues of O. ehrenbergii and S. buccalis from two coastal sites of Karachi; Buleji and ‎Sunehri during Southwest monsoon (August and September) and Northeast monsoon ‎‎(December and January) seasons of the year 2018. The mean amounts of Hg in edible ‎tissues of sea cucumbers were as follows: O. ehrenbergii (0.0176 mg/kg dry wt.) and S. ‎buccalis (0.0155 mg/kg dry wt.). Hg amounts in muscles of both species are much lower ‎than the maximum permissible limits (0.5 mg/kg wet wt.). Estimated Daily Intakes for ‎adults consuming O. ehrenbergii and S. buccalis are lower than published RfD values. ‎Total Target Hazard Quotient (TTHQ) values (0.00787) are also lower than 1, it may be ‎concluded that the consumption of these sea cucumbers from Karachi, do not pose any ‎health hazards to human as Hg amounts were concerned.‎
  • Interspecific isozyme variability in Porcellanid crabs (Crustacea: Decapoda: Anomura) ‎from the coastal waters of Pakistan.‎

    Naz, Farah; Odhano, Sahir; Saher, Noor Us; Kamal, Mustafa (2019-06-30)
    Polyacrylamide gel electrophoresis was used to investigate the interspecific isozyme ‎variability among three species of Porcellanid crabs: Petrolisthes ornatus, P. rufescens ‎and P. boscii from the coastal waters of Karachi, Pakistan. Seven enzyme systems and ‎the general protein (non-specific) were examined for genetic variations. Among the three ‎species; Nei's heterozygosity for overall loci was observed (0.067), whereas Shannon’s ‎information Index (I) for genetic variations based on the heterozygosity was (0.055) in ‎three species of Genus Petrolisthes. Species were differentiated from each other as Nei’s ‎genetic distance ranged in between 0.0093- 0.0314. The genetic relationship among the ‎three species of genus Petrolisthes similar from those inferred from morphological ‎features.‎

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