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AquaDocs is the joint open access repository of the UNESCO/IOC InternationaI Oceanographic Data and Information Exchange (IODE) and the International Marine and Aquatic Sciences Libraries and Information Centers (IAMSLIC) with support from the FAO Aquatic Sciences and Fisheries Abstracts. It is a thematic repository covering the natural marine, estuarine /brackish and fresh water environments and includes all aspects of the science, technology, management and conservation of these environments, their organisms and resources, and the economic, sociological and legal aspects. [see About]
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Benthic assemblages for ecological evaluation of Bardawil Lagoon, Mediterranean Sea, Egypt.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.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.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.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.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.