Tariq Al-Najjar

Tariq Al-Najjar
University of Jordan Aqaba Branch · Marine Biology

PHD, professor

About

60
Publications
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786
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Publications

Publications (60)
Article
Full-text available
The health of reef-building corals has declined due to climate change and pollution. However, less is known about whether giant clams, reef-dwelling bivalves with a photosymbiotic partnership similar to that found in reef-building corals, are also threatened by environmental degradation. To compare giant clam health against a prehistoric baseline,...
Article
Full-text available
To assess the utility of the seagrass (Halophila stipulacea) for biomonitoring of metal pollution, seagrass samples were collected from four sites along the Jordanian coast of the Gulf of Aqaba between April and July 2017. Concentrations of trace metals (Cr, Mn, Fe, Ni, Zn, and Pb) in leaves, rhizomes, and roots were compared to published data on s...
Article
Full-text available
One hundred and seven samples were collected from sea surface from 5 stations along the Jordanian coast of the Gulf of Aqaba. 188 species were identified under six phytoplankton classes. Dinoflagellates dominate sixty percent of the total species. Diatoms constituted 38% and other groups represented by 2%. The geographical distribution of the ident...
Article
Full-text available
Stonefish samples (Synanceia verrucosa) were collected along the coastline of the Gulf of Aqaba, Red Sea. The acute toxicity of the extracted venom on BALB/c mice was evaluated using the biochemical assays: Lipid Peroxidation (LPO), Alanine Transaminase (ALT), Gamma-Glutamyl Transferase (GGT), and Lactate Dehydrogenase (LDH). Results showed that wh...
Article
Full-text available
The present study utilizes coastal and environmental engineering to investigate the histopathological effects of Synanceia verrucosa venom on Albino BALB/c mice. S. verrucosa is the most hazardous venomous marine fish that belong to the family Synanceiidae, generally known as the "Reef Stonefish". Crude venom was collected from venom glands of the...
Article
Full-text available
The stonefish (Synanceia verrucosa) is one of the most dangerous marine organisms due to its life-threatening venom that might negatively affect many tissues in living organisms such as liver and kidney tissues. As an aim to spot Synanceia verrucosa for future research and target the beach tourists to take precautions not get envenomated by stonefi...
Article
Full-text available
The stonefish (Synanceia verrucosa) is one of the most dangerous marine organisms due to its life-threatening venom that might negatively affect many tissues in living organisms such as liver and kidney tissues. As an aim to spot Synanceia verrucosa for future research and target the beach tourists to take precautions not get envenomated by stonefi...
Article
Full-text available
Level of mercury (Hg) heavy metal concentrations were investigated using Direct Mercury Ana-lyzer (DMA) in muscles, liver, gills, gonads and kidney of three fish species (Katsuwonus pelamis, Auxis thazard and Euthynnus affinis) that were collected from the Jordanian coast of the Gulf of Aqaba, Red Sea during May to December 2015. Heavy metals accum...
Article
Full-text available
Level of mercury (Hg) heavy metal concentrations were investigated using Direct Mercury Analyzer (DMA) in muscles, liver, gills, gonads and kidney of three fish species (Katsuwonus pelamis, Auxis thazard andEuthynnus affinis) that were collected from the Jordanian coast of the Gulf of Aqaba, Red Sea during May to December 2015. Heavy metals accumul...
Article
Full-text available
The aim of this study was to investigate the community structure of deep sea fishes in the northern Gulf of Aqaba. Deep fish traps, short lines and long lines were deployed at depth ranges from 60 to 700 m between June 2014 and May 2015. A total of 369 fish individuals belonging to 37 species in 21 families were collected. The most abundant family...
Article
Full-text available
Trace elements concentrations of (Cu, Ni, Cd, Co, Cr, and Pb) were measured in the body wall and pyloric caeca of sea star (Astropecten polyacanthus) collected from the Ayla lagoons located at the most northern part of Jordanian coast of the Gulf of Aqaba during summer 2015. Significant differences were found between body wall and pyloric caeca p <...
Article
Full-text available
Concentrations of the heavy metals, lead (Pb) and cadmium (Cd), in the muscles, liver, gills, gonads and kidneys of three fish species (Katsuwonus pelamis, Auxis thazard and Euthynnus affinis) collected from the Jordanian coast of the Gulf of Aqaba, Red Sea during May to December 2015 were investigated using graphite furnace atomic absorption spect...
Article
Full-text available
Concentrations of Cd, Cr, Pb, Fe, Cu, Mn, Zn, Mg, and Ca were measured in different body compartments of the echinoid Diadema setosum from the Jordanian Coast of the Gulf of Aqaba. The soft organs had higher concentrations and of Zn and Fe compared to the calcified parts which in turn had higher concentrations of Cd, Cr, and Pb. Heavy metals in D....
Article
Full-text available
Samples of two species of sea cucumber namely Actinophyga bannwarth and Holothuria impatiens and sediments were collected from two sites along the Jordanian coast of the Gulf of Aqaba in the period January-July 2009. The samples were analyzed for their content of (Cd, Cu, Pb, Mn, Zn, Ni and Fe) in the body compartments of two sizes (small and large...
Conference Paper
Full-text available
Several environmental hazards are due to the spreading of high levels of potentially harmful substances (PHS) such as oil, plastic and heavy metals in marine ecosystems. Marine related activities such as manufacturing, constructions and industry may lead to elevated levels of PHS, increasing the potential environmental risk worldwide. PHS are able...
Article
Full-text available
This study aimed to evaluate the toxicity of stonefish venom isolated from genus Synanceia ver-rucosa, collected during winter 2015 and spring 2016 along the Jordanian coastline of Gulf of Aqaba, Red sea. Stonefish venom was isolated from the venom glands of the dorsal spines. Venom was in-tramuscular injected in experimental animal BALB c/mice in...
Article
Full-text available
The Reef Stonefish (Synanceia verrucosa) is one of the most dangerous venomous fish known, and has caused occasional human fatalities. The present study was designed to examine some of the pathological effects of the venom from this fish in Sprague Dawley rats. Crude venom was extracted from venom glands of the dorsal spines of stonefish specimens...
Article
Full-text available
Heavy metals concentration of Zn, Cr, Cd and Cu in liver, gills and muscles of the two fish species Iago omanensis and Auxis thazar were determined using flammable Atomic Absorption Spectrophotometer (AAS). Fish species were collected from the northern Gulf of Aqaba during the period from June 2015 - Jan 2016. Liver were found to be the major organ...
Article
Full-text available
Heavy metal concentrations of Zn, Cr, Cd and Cu were investigated using flame Atomic Absorption Spectrophotometer (AAS) in liver, gills and muscles of three mesopelagic fish species from the northern Gulf of Aqaba (Argyrops filamentosus, Argyrops spinifer and Polysteganus coeruleopunctatus) collected during the period from 21/6/2014 to 15/1/2015. T...
Article
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Heavy metal concentrations of Ni, Mg, Co, Cr, Cd and Cu were investigatedusing flame Atomic Absorption Spectrophotometer (AAS) in the liver, kidney, muscle, scale, gonad, gill and stomach of Cheilinus trilobatus fish species from the northern Gulf of Aqaba. Cheilinus trilobatus fish species were collected during the period May to August 2013. The r...
Article
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Abstract Among small sized gastropods found in Aqaba (Jordan), Sansonia occurs relatively common with Sansonia cebuana which is recognized from the the fringing reef near the Marine Biological Station at Aqaba, while Mecoliotia and Chrystella are rare. Mecoliotia aqabaensis n. sp and Chrystella shinaqi n. sp are described with the later resembling...
Technical Report
This report is based on the data collected by the participant scientists, in addition to the published and unpublished data, the results and analysis of the surveys, and research and monitoring programmes and various activities carried out by the staff of the Faculty of Marine Sciences, researchers of the Marine Science Station, and researchers fro...
Article
Full-text available
The aim of this study is to provide knowledge and establish data about the levels of some trace metals in the Euthynnus affinis fish. The Euthynnus affinis is an important commercial migratory fish consumed by the locals in the Gulf of Aqaba, Red Sea, during its seasonal period. The levels of these heavy metals (magnesium, manganese, nickel, chromi...
Article
Full-text available
Brittle stars (Ophiocoma scolopendrina) were collected from three different stations distributed along the northern part of the Gulf of Aqaba during 2012. Concentrations of 6 heavy metals (Cu, Ni, Cd, Co, Cr, and Pb) were measured in two body compartments (central disc and arms) using F-AAS analysis. Brittle stars from a station located in the most...
Article
Full-text available
No significant differences were found among the average amounts of mesozooplankton studied at seven stations in the northern part of the Gulf of Aqaba (six coastal and one offshore station) in 2003. The seasonal variation of the zooplankton biomass, however, followed a clear pattern: average values were high during autumn and spring, and low during...
Article
Full-text available
Bigeye houndsharks (Iago omanensis, deep sea predators) were collected from the Gulf of Aqaba, Red Sea during 2009. Concentrations of eight heavy metals (Cu, Ni, Pb, Mn, Zn, Co, Fe and Cr) were measured in stomach food contents, gills, kidney, liver, muscle, ova, ovary and testes using F-AAS analysis. The results indicated significant differences b...
Article
Full-text available
Fishes of the family Carangidae, Decapterus macarellus, Decapterus macrosoma, and De-capterus russelli, were collected from the Jor-danian Aqaba coast during 2008-2009 for the determination of their metal concentrations in various organs (muscle, liver, kidney, gonads, gills, and stomach food contents) using flame atomic absorption spectrometry (AA...
Article
Full-text available
The present study investigates the levels of Cu, Ni, Pb, Cd, Mg, Zn and Fe in the dorso-lateral muscles, liver, kidney, gonads, eyes, brain, gills, bone, heart and stomach food contents of the fish species Caesio varilineata and Caesio lunaris, collected from the Gulf of Aqaba during 2008 and 2009. Not any significant difference between both zoopla...
Article
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Degradation rates of light and heavy oil in permeable carbonate sands from the Gulf of Aqaba were investigated to evaluate the ability of sediments to degrade oil compounds. Silicate sands that are less permeable and different properties from carbonate sands were used for comparison. Estimates of oil degradation rates were based on oxygen consumpti...
Article
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The temporal distributions of pigment on bio-genic calcareous and terrigenic reef sediments, chlorophyll a, chlorophyll b, chlorophyll c, fuco-xanthin, and porphine concentrations were mea-sured monthly in two sediment columns (0 -15 cm) for one year. Pigment concentrations increased significantly during winter (November-April) in both sediment typ...
Article
Full-text available
The distribution of metals (Cd, Cr, Pb, Cu, Ni and Zn) was determined in sediment cores collected from five major areas representing different an-thropogenic activities along the Jordanian coast during 27 February-11 March 2008. Metal con-centrations in these sediments were relatively low compared to reported values from polluted areas. At some of...
Article
Full-text available
Composition and abundance of submerged marine litter at one selected site within a coral reef area along the Jordanian coast of the Gulf of Aqaba has been estimated. The litter was collected in a clean up voluntarily campaigns that took place in the period 19 September 2006. A total of 14613 items weighing 4112.2 kg were collected during the survey...
Article
Full-text available
The Gulf of Aqaba is the only seaport in Jordan which currently has intense activities such as industrial development, phosphate ore exportation, oil importation, shipping, commercial and sport fishing. Most of these activities, especially the phosphate ore exportation, could cause serious radiological effects to the marine environment. Thus, it is...
Article
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The occurrence of plastic pellets on the Jordanian beaches along the northeastern side of the Gulf of Aqaba (Red Sea) is being reported for the first time. Five beaches of about 4,650 m in length and 134,000 m 2 in area were surveyed for the presence of these spherules during two successive years. Pellets with a variety of colors, shapes and sizes...
Article
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Variations of heavy metals concentrations (Pb, Zn, Ni and Cd) in suspended matter as well as the physical properties (temperature, salinity, dissolved oxygen and pH) at five coastal sites and one reference station (offshore) were measured on seasonal base of the year 2005. Seasonal variations of seawater temperature, salinity, pH and dissolved oxyg...
Article
Full-text available
Composition and abundance of submerged marine litter at six selected sites within a coral reef area along the Jordanian coast of the Gulf of Aqaba have been estimated. The litter was collected in clean up voluntary campaigns that took place in the period between 25 August 2003 and 29 February 2004. A total of 10,506 items weighing 1159 kg were coll...
Article
Full-text available
Environmental qualities of coastal water and bottom sediment were assessed at Jordan's northernmost tip of Gulf of Aqaba to evaluate possible impacts of the bordering fish pen cages in Eilat. Results showed significant differences between surface and bottom water in the chemical and physical variables in the different months of the year (2004-2005)...
Article
Full-text available
Dissolution of raw phosphate (apatite) in sea water of the Gulf of Aqaba was investigated through lab incubation experiments. Three types from three different sources (Al-Hasa, Al-Abyad and Esh-Shydiya) have been used for these experiments. Impact of quantity, grain size, and source (type) of raw phosphate on dissolution rate were studied. Statisti...
Article
Full-text available
Zooplankton biomass were measured monthly from eleven coastal sampling station and one offshore station from the northern par of the Gulf of Aqaba between January and December 2004. Significant difference in zooplankton biomass was obtained among different stations and different sampling months. The highest biomass was recorded in January (50.75 mg...
Article
Full-text available
The Gulf of Aqaba is a narrow, warm, saline, and oligotrophic gulf surrounded by arid deserts and is connected to the northern Red Sea via the Strait of Tiran. The Gulf of Aqaba is characterized by strong seasonal fluctuations in primary production and phytoplankton biomass (Genin et al 1995, Lindell and Post 1995). Primary production in the gulf i...
Article
The abundance and composition of the mesozooplankton were studied in the upper 100 m of the northern Gulf of Aqaba over a period of 22 months between February 2002 and December 2003. The samples were collected monthly with a Nansen net of 200 μm mesh size. The abundance of total mesozooplankton ranged between 245 and 3065 ind. m− 3. Highest densiti...
Article
Full-text available
Seasonal changes of tide signal(s), temperature, salinity and current were studied during the years 2004-2005 in the northernmost Gulf of Aqaba, which is under developmental activities, to obtain scientific bases for best management and sustainability. Spectrum analysis revealed permanent signals of tide measurements during all seasons, which repre...
Article
Full-text available
A total of 12 feeding experiments were conducted in the northern Gulf of Aqaba during spring (March/April) and autumn (September/October) 2002 at the Marine Science Station (MSS) in Aqaba. Females of three species of clausocalanids were selected: Clausocalanus farrani, C. furcatus and Ctenocalanus vanus. Natural occurring particle (NOP) larger than...
Article
Full-text available
Seawater samples were collected biweekly from the northern Gulf of Aqaba, Red Sea, for Phytoplankton analysis during the period May 1998 to October 1999. Microscopic counts and HPLC methods were employed. Procaryotic and eucaryotic ultraplankton dominated throughout most of the year, with larger nano- and microplankton making up only 5% of the phot...
Article
Full-text available
The Gulf of Aqaba is a narrow gulf surrounded by arid deserts and connected to the northern Red Sea via a shallow straight through which water is exchanged. It is an oligotrophic sea with high evaporation and low precipitation rates, and the low nutrient Red Sea surface waters are the primary source of water input into the gulf. The Gulf of Aqaba i...
Article
Full-text available
Clausocalanid copepods dominate subtropical mesozooplankton communities. Their life cycles, however, are generally unknown. Here, we follow the seasonal population development and reproductive biology of Red Sea clausocalanids in the northern Gulf of Aqaba, between February 2002 and December 2003. Monthly vertical hauls taken with a Nansen net (200...
Article
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The thermohaline characteristics of the Gulf of Aqaba, Red Sea,depict a well-defined seasonal pattern of winter mixing from December toApril and summer stratification from May to November. This thermohalinestructure is a major controlling factor of the nutrient, chlorophyll a and primary productivity seasonal cycles. The nitrate and chlorophyll a c...
Article
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Litter was assessed on three beaches along the Jordanian coast of the Gulf of Aqaba, south of the town Aqaba, monthly during 1994 and 1995, in order to determine its nature, extent and possible sources. The overall mean was about 5 and 3 items/m(2) in 1994 and 1995, respectively. Approximately a total of 14,000 m(2) were examined and a total of 101...
Article
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Zooplankton grazing on bacterio- and phytoplankton was studied in the Gulf of Aqaba and the Northern Red Sea during Meteor Cruise Me 44-2 in February-March 1999. Protozoan graz- ing on bacterioplankton and autotrophic ultraplankton was studied by the Landry dilution method. Microzooplankton grazing on phytoplankton >6 μm was studied by incubation e...
Article
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Using molecular approach, we aimed to identify fungal phylotypes that exist in the Gulf of Aqaba, Red sea. Several samples were taken from sedi-ments and seawater of three locations along 26 kilometers at 5 m depth. 18S small subunit rRNA gene was targeted for PCR amplification and sequencing. Partial sequences introduced as query in BLASTN phyloge...

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Project
Stonefish is one of the most dangerous marine organisms in the Gulf of Aqaba. Accidents of injuries by stonefish characterized by intense pain, respiratory failure, cardiac failure, paralysis and death in severe cases.