Le Bulletin de l'Institut National des Sciences et Technologie de la Mer (INSTM) est publié depuis 1924 et indexé dans 'Aquatic Sciences and Fisheries Abstracts' (ASFA - FAO). Il fait suite au "Bulletin de l’Institut National Scientifique et Technique d'Océanographie et de Pêche" (INSTOP) et au "Bulletin de La Station Océanographique de Salammbô" (SOS).

Recent Submissions

  • Acute and subacute toxicity of naphthalene in a filter-feeding species Styela plicata (Chordata, Ascidiacea).

    El Ayari, Tahani; Ben Ahmed, Raja; Ghannem, Samir; Trigui El Menif, Najoua (2023)
    INSTM Bulletin: Marine and Freshwater Sciences
    The aim of the current study was the assessment of a Polycyclic aromatic hydrocarbon (PAHs) toxicity on an ascidian species, Styela plicata. Acute and subacute toxicity of naphthalene (NAP) has been determined using five increasing concentrations (0.5, 1, 1.5, 2.5 and 5 mg/l) during 96h of exposure. The half lethal concentration (LC50, 96h) value of naphthalene for S. plicata was 2.41 mg/l. Furthermore, the filtration activity decreased in the five tested concentrations of NAP; a significant decrease by 69% and 91.8% was observed after 1h in the groups exposed to C1 and C5, respectively. A similar pattern was noted after 2h of filtration; the decrease was estimated to 39% in C1 and 72.5% in C5. The results from this bioassay confirmed the toxicity of NAP on S. plicata; we also provided information about the use of S. plicata as a potential bioindicator species for the assessment of PAHs toxicity.
  • A rare stranding event of the short beaked common dolphin (Delphinus delphis) in the eastern Tunisian coastline

    Chaieb, Olfa; Maatouk, Kaouthar; Bradai, Mohamed Nejmeddine (2023)
    INSTM Bulletin: Marine and Freshwater Sciences
    A short beaked common dolphin was found stranded on March 3rd 2021, on Hammamet beach (Central-eastern Tunisia). This is a rare stranding event since it represents the third documented stranded individual reported on Tunisian coastline for half a century. Necropsy of the freshly dead female dolphin was conducted to know the presumable cause of death. The pregnant dolphin was bearing a mid-term female fetus with fully developed organs. Detailed biometric data were taken for both individuals. Samples were collected and preserved in the tissue bank of the national stranding network. The freshly dead fetus is preserved at the oceanographic museum for scientific collection. The rare stranding of this species observed here would be attributed to the small population frequenting Tunisian waters. This note improves knowledge on this poorly studied species in the south-central Mediterranean area.
  • First Record of the tropical seagrass Halophila stipulacea (Forsskål) Ascherson, 1867 in the Punic Port of Carthage-Salammbô (Northern Tunisia).

    Ben Mustapha, Karim; Attouchi, Mourad; Afli, Ahmed; Missaoui, Hechmi (2023)
    Bulletin de l'Institut National des Sciences et Technologies de la Mer de Salammbô
    The bioinvasion has increased in recent years with climate change, and some invasive species have caused significant damage to the marine ecosystem, including a great loss of biodiversity. The studied seagrass is a marine tropical phanerogam introduced in the Mediterranean at the end of the 19th century and in southern Tunisia in 2003. In this study we record this species for the first time in northern Tunisia, precisely in the Punic Port of Carthage-Salammbo. Surveys were carried out on foot around the Punic Port, and measurements/photos were taken on site, and others in the laboratory on taken samples. Most of these measures do not differ from those carried out elsewhere in the Mediterranean. For the moment, the plant does not occupy a large part of the port buttom, but it may invade all the area in the future.
  • Eroding coastal sandy barriers under changing aeolian flux in the Gulf of Tunis (Tunisia).

    Amrouni, Oula; Ibrahim Said, Hodan; Hzami, Abderraouf; Missaoui, Hechmi; Mahe, Gil; Heggy, Essam (2023)
    INSTM Bulletin: Marine and Freshwater Sciences
    Sandy barriers are coastal features formed and reworked by terrestrial and marine-induced processes along decadal to millenary scale periods. In the semi-arid areas along the extended North African coast, these coastal landscapes are undergoing accelerated morphodynamical changes induced by intensifying anthropogenic and climate drivers in the last century. To quantify the latter, we assess the changes in sediment dynamics of the Ghar El Melh sandy barrier extended over the northern part of the Gulf of Tunis in Tunisia using sedimentological analysis and quantification of the aeolian flux. A total of 37 subsurface samples and 30 surface aeolian trapped ones were collected at the coastal dunes of Ghar El Melh. Our sedimentological analysis reveals a distribution of 97% of sandy sediments and 3% of silty facies. The modal statistical analysis suggests that there are three distinguishable sediment types with 87% of samples formed by fine sands with modal value of 0.16 mm. The mixture of these indicates mixed terrigenous and marine sources redistributed by the hydrodynamic processes. The measurement of the aeolian flow suggests a maximum value of 0.0022 kg.m.-1min-1 which occurs in dust storms. This study reveals the low detrital sand supplies to the lagoon-sea barrier of Ghar El Melh, results in its gradual submersion, further exposing the coastal lagoon and engendering severe ecological degradations.
  • Striped red mullet (Mullus surmuletus, Linnaeus, 1758) from Rafraf-Sidi Ali Mekki region (Bizerte, Tunisia): length-weight relationship and histological assessment of gonad maturation.

    Dhaouadi, Raouf; Bouhalfaya, Raja; El Hafi, Mohamed Oussama; Ben Abdallah Ben Hdaj Hamida, Olfa; Mosbah, Amine; Tarhouni, Dhiaeddine; Ayari, Wassila; Missaoui, Hechmi (2023)
    INSTM Bulletin: Marine and Freshwater Sciences
    The aim of this study is to investigate thegonadal changes of striped red mullet (MullussurmuletusLinnaeus, 1758) in Rafraf –Sidi Ali Mekki region in Tunisia. A total of 243specimens were collected monthlybetween March 2014 and February 2015.Fulton’s condition factor (K) and the length-weight parameters were estimated. There was correlation between the fish total length and weight (R2:0.75). The K values ranged between 0.93 and 3.38. The values of b parameter ranged from 3.18. gonadosomaticand hepatosomatic indicesshow maximum values during April. Different stages in females and inmales were observed according to gonadal development.
  • Preliminary inventory of metazoan parasites of the Lessepsian bluespotted cornetfish Fistularia commersonii in the Gulf of Gabès, Tunisia

    Boussellaa, Wiem; Derbel, Hela; Neifar, Lassad (2023)
    INSTM Bulletin: Marine and Freshwater Sciences
    Biological invasions are widely acknowledged as a serious threat to biodiversity, but the role of parasites in marine ecosystem processes is still poorly understood. The so-called Lessepsian migration, or invasions through the Suez Canal from the Red Sea to the Mediterranean Sea, also fits this description. Here, we studied the parasitofauna of Fistularia commersonii collected from the Gulf of Gabès of Tunisia. 43 individuals of F. commersonii were sampled from the Gulf of Gabès. Parasite richness, prevalence and intensity were investigated, Additionally, we reviewed the literature to identify native and invasive parasite species recorded. Our results suggest the co-introduction of nine parasite species that are assumed to be originate from the Red Sea. In addition, we found that the invasive fish has acquired nineteen parasite species that are native from the Mediterranean Sea. The Lessepsian migrant may potentially change the dynamics of native and invasive parasite-host interactions through parasite co-introduction and parasite acquisition, according to these results. The higher F. commersonii infection rates in the area that has been invaded are also consistent with the predictions made by the "Enemy Release Hypothesis." These results show the importance of using community studies, such as the one described here, to understand the role of parasites in Lessepsian migration.
  • First record of Alopias superciliosus Lowe,1841 (Elasmobranchii: Alopiidae) in Tunisian water

    Bouzid, Ichrak; Enajjar, Samira; Saidi, Bechir; Bradai, Mohamed Nejemeddine (2023)
    INSTM Bulletin: Marine and Freshwater Sciences
    On July 2021, one specimens of Alopias superciliosus Lowe,1841 was captured as bycatch in Kelibia (Tunisia) at the following coordinate 36°30’740” N; 11°48’451” E, by a trawler at 400 m depth. It was a mature male of 350 cm total length and 159 kg in eviscerated weight. This represents the first record of the bigeye thresher shark in the area.
  • Seasonal variation of the ectoparasite infestation levels of Trachurus picturatusin Bizerte (Tunisia).

    Hamdi, Ilhem; Hermida, Margarida; Zouari Tlig, Sabiha; Benmasour, Bouchra (2023)
    INSTM Bulletin: Marine and Freshwater Sciences
    The blue jack mackerel, Trachuruspicturatus, is a commercially important resource in the Mediterranean Sea and the North-East Atlantic. The main aim of this work was to assess the infection levels and diversity of the ectoparasites of the blue jack mackerel.Over a one-year period, between March 2017 and February 2018, 126 specimens of T. picturatuswere collected seasonally from the Bizerte coast (Tunisia). The ectoparasite fauna of the examined host was composed ofthe two monogenean species, Pseudaxinetrachuriand Gastrocotyletrachuriand a copepod species,Peniculusfistula fistula. This is the first record of thiscopepod parasite inTunisia. The analysis revealed that the infection levels fluctuated throughout the year. Both monogeneans (P. trachuriand G. trachuri) had high prevalences during the warm season (P%=87.1, P%= 32.3, respectively). Additionally, P. trachurishowed some seasonal variations in mean abundance and mean intensity between summer and the other seasons. Furthermore, there was a highly significant variation in the mean abundance of G. trachuribetween the summer and autumn-winter seasons. The resultsof the current study may be explained by the seasonal variations in environmental conditions, the life cycles of the hosts and parasites, the feeding and migratory patterns of the hosts, the chemicals released by the hosts, and the interspecific competition between the two monogenean species.
  • L'ostréiculture en Tunisie: résultats acquis dans le lac de Porto-farina.

    Dantan, J. L.; Heldt, H. (Station Océanographique de Salammbô, 1932)
    Le commerce des coquillages en Tunisie est chaque jour plus important si certaines espèces les clovisses arapèdes, murex, coteaux, pholades, haricots et dattes de mer, et pour une certaines part, les moules sont pechèes dans le pays.
  • Comparative study on the composition and functional properties of chitin/chitosan extracted by new combined bioprocess.

    Bessadok, Boutheina; Sadok, Saloua (2023)
    INSTM Bulletin: Marine and Freshwater Sciences
    Bio-extraction of chitin is a greener and eco-friendly process than the conventional chemical method. Taking shrimp waste of Pandalus borealis recovered from plant as a model, two methods were applied for chitin extraction; a chemical and a yeast-based processes (Ch-C and Ch-B respectively). The recovered chitins and chitosan were tested for their biochemical and functional properties. Compared to commercial chitin, both lots, have similar chitin recovery (~26%) and physiochemical properties with ash<1%, protein <10%, with degrees of acetylation (DA) varying 70-80%. However, chitosan obtained from Ch-B lot showed significantly lower molecular weight (MW) and DA (MW: 6.34 KDa, DA: 23.4%) than that found in Ch-C chitosan (MW: 11.36 KDa, DA: 33.4%). The new method proved to be efficient for the production of chitosan of good quality which allowed the elaboration of the membrane.
  • Effects of chitosan-microparticles-coating on the quality of vacuum-packed sea bass (Dicentrarchus labrax) fillets during refrigerated storage.

    Besbes, Nadia; Sadok, Saloua (2023)
    INSTM Bulletin: Marine and Freshwater Sciences
    In this work, a combination of vaccum pachaging and bio-coating by chitosan were used to coat sea bass (Dicentrarchus labrax) fillets in order to delay growth of total mesophilic aerobic bacteria, psychrophilic bacteria during refrigerated storage (22 days). The preservative effect of refrigerated and vacuum-packed seabass (Dicentrarchus labrax) fillets treated at two different percentage doses (0.2% and 0.5% w/w) of co-products of shellfish was evaluated on the basis of microbiological, proximate composition, pH, total volatile basic nitrogen (TVB-N), trimethylamine (TMA), thiobarbyturic acid (TBArs), and fatty acids (FA). Two ways ANOVA and multiple comparisons were applied, factors being storage time and treatment. During refrigerated storage, the treatment with chitosan from separate co-products exhibited more antimicrobial activity and the lowest value of the TVB-N, TMA and TBArs compared to control lots. The bio-coating by 0.5% dose of chitosan preserved quality and the prolonged shelf-life for 10 days longer. Overall, this treatment may open new promising opportunities for the biopreservation of fish products by enhancing the period of storage of refrigerated and vacuum-packed seabass fillets.
  • Overview of Bottlenose dolphin depredation in Teboulba region (East of Tunisia).

    Ben Massaoud, Rimel; Gharbi, Maissa; Cherif, Mourad; Koched, Wael; Ben Nakhla, Lobna (2023)
    INSTM Bulletin: Marine and Freshwater Sciences
    This work was carried out in response to the numerous fishermen claims following to the interaction between dolphins and fishing gears along the coast of Teboulba. The aims of this work were: to establish an inventory of dolphins present in the study area and interacting with fisheries, to define the most affected fisheries by the depredation and to attempt to assess it economic consequences. For this purpose, field surveys as well as weekly monitoring of a sample of the fleet and sea trips were carried out in order to respond to the previously mentioned objectives. The findings of this study led to the conclusion that there are two dolphin’s species: the Bottlenose dolphin and the Striped dolphin. These two species have a different demographic and ecological distribution. They also interact in two different ways with the fishing boats and their nets. According to the surveys, the most depredated fisheries is the small scall fisheries. Set gillnet and trammel nets were the types of the fishing gear most vulnerable to dolphin depredation. The depredation rate and economical loss due to depredation vary slightly between gillnets and trammel nets. The depredation induces many holes with different size requiring mending operations that can be onerous. Likewise for landing, the resulting bites on the catch leave it unsaleable. It is necessary to continue this study in order to identify the factors that can cause the depredation and propose mitigation measures to avoid any ecological and economic blunder.
  • Age et croissance de l'allache ou sardinelle ronde (Sardinella aurita Valenciennes, 1847) dans le Cap Bon (Tunisie).

    Gaamour, Adel; Missaoui, Hechmi; El Abed, Amor; Deniel, Christian (2001)
    Bulletin de l'Institut National des Sciences et Technologies de la Mer de Salammbô
    A new esseous part, the opercula bone, is used to estimate age of 2009 round sardine (Sardinella aurita Valenciennes, 1847) captured in the Cap Bon area. The period of sampling with a monthly rhythm, is spread out June 1994 at December 1995 and from June to September 1996. Th relation between the length of fish (LF) and the ray of opercula (RT) is LF= 22,25 RT 0,994 . The validation of age estimate method is carried out directly by the monthly follow-up of overage marginal lengthening and the percentage of individuals with marginal hyaline zone. This study showed that the round sardine has a double cycle of growth of the age-length shows that the females dominate in the majority of age groups the parameter of growth in length according to the model of Von Bertalanffy are estimated by direct enumeration of the hyaline zone and retrocalcul. The curves of growth obtained by employ retrocalculed data describe better the growth of the round sardine in Cap Bon area.
  • First record of the Siphonophore physalia physalis (Linnaeus, 1758) in the gulf of Tunis (Tunisia)

    Fathalli, Afef; Zaafrane, S.; Maatouk, K.; Hafi, O.; Hamza, A.; Missaoui, H. (2020)
    Bulletin de l'Institut National des Sciences et Technologies de la Mer de Salammbô
    The Portuguese man-of-war Physalia physalis (Linnaeus, 1758), is a pleustonic cnidarian commonly found in the tropical and subtropical areas of the world’s oceans. To date, and to our knowledge no signalization of P. physalis has been reported in Tunisia. In this note, we report for the first time, the presence of P. physalis in Tunisian coast on April 2, 2021. One colony was stranded at Carthage Amilcar beach. Three others were collected alive by fishermen in the open sea in front of Rades and Hammam Lif coasts. The specimens showed an unsymmetrical pneumatophore with a wrinkled longitudinal ridge consisting of a transparent purple-blue membrane, between 15 and 25 cm in length. The tentacles were approximately 50 to 130 cm in length. The presence of P. physalis in the Tunis gulf has coincided with the stranding of the jellyfish Velella velella (Linnaeus, 1758). Given the potential danger of this species for humans, it is essential to integrate it into the monitoring and observation network of the coastline.
  • About new records of the mole crab (Albunea carabus l. 1758, decapoda, anomura, hippoidea) in Tunisian waters (central Mediterranean sea)

    Ennajar, Samira; Saidi, Bechir; Afif, Othman; Bradai, M. Nejmeddine (2020)
    Bulletin de l'Institut National des Sciences et Technologies de la Mer de Salammbô
    Four observations of the mole crab albunea carabus were registered from 2019 to 2021: one specimen was filmed digging the sand in 5 october 2019 by a scientific citizen in the sandy beach of ghar el melh (northern tunisia); a second specimen was observed in november 2019 on rimel beach (bizerta); the third one was caught by gillnet at 3 m depth in ras kapoudia (east of tunisia) in 1 october 2020 and the fourth one was captured by a fishing rod in 18 april 2021 in menzel horr (east of tunisia). the third specimen (from ras kapoudia) was a female measuring 42.1 mm total length (tl), 19.4 mm carapace length (cl), 21.6 mm carapace width (cw) and 22.7 mm abdominal somites and telson length (stl). no measurements were made for the other specimens. these occurrences confirm well the presence of the species in tunisia, since two carapaces and one cheliped of a. carabus were observed in october 1972 in the bay of tunis.
  • The first record of Lampris guttatus (Brünnich, 1788) in the Tunisian coasts (Central Mediterranean Sea)

    Ennajar, Samira; Saidi, Béchir; Bradai, M. Nejmeddine (2020)
    Bulletin de l'Institut National des Sciences et Technologies de la Mer de Salammbô
    on 17 May 2021, one specimens of Lampris guttatus (Brünnich, 1788) was captured in Ghar El Melh (Northern Tunisia, Central Mediterranean Sea) by a small scale vessel using gill nets at 3 m depth. This represents the first record of the Opah in the area.
  • Apport de la télédétection très haute résolution pour l’étude diachronique des plages de la région centre Algérienne

    Remmache, Karima; Bachari, N.E.I; Houma, F. (2020)
    Bulletin de l'Institut National des Sciences et Technologies de la Mer de Salammbô
    L’analyse et la compréhension d’évolutions du rivage est l’une des questions préoccupantes pour les décideurs du littoral afin d’une gestion intégrée des zones côtières et la mise en œuvre des mesures rapides visant à restaurer l’équilibre côtier. A cet effet, l’objectif de cet article est le suivi spatiotemporel du trait de côte et des plages d’une région locale qui contient différents ouvrages maritimes sur une série temporelle de 15ans. Pour cela nous avons eu recours aux images satellites issues de Google earth avec une résolution spatiale de 0.6 m. La méthodologie développée permet une exploitation meilleure des images satellitales Google earth par rapport aux méthodes de téléchargements et repose sur trois méthodes soit directement via Google earth, ou par d’autres logiciels dont Offline Map Maker et Smart GIS. Les techniques du SIG utilisées pour le traitement des images téléchargées nous ont permis de faire une rectification des images Google earth par l’élimination du décalage entre ses fonds spacieux causé par la superposition des dates anciennes et récentes afin de faire une étude diachronique des plages et un diagnostic sur les variations historiques du trait de côte. Les changements de superficie des plages ont été comparés pour déterminer l’évolution entre 2002 et 2017. Les énergies des vagues régissent la réfraction-diffraction des vagues et la concentration de cette énergie sur certaines zones, pour cela nous avons utilisé le modèle SWAN à haute résolution. Selon les résultats obtenus, nous avons constaté la présence d’érosion/ accrétion sur des plages voisines, ainsi nous avons remarqué une concordance entre la distribution des énergies des vagues et l’évolution du trait de côte. Les cartes élaborées représentant chacune une commune de la côte algéroise constitueront des informations clés pour surveiller, valoriser et qualifier les plages
  • Analyse de mesures courantométriques dans le golfe de Hammamet (Tunisie)

    Brahim, Mouldi; Atoui, A.; Sammari, Cherif (2020)
    Bulletin de l'Institut National des Sciences et Technologies de la Mer de Salammbô
    Le littoral du golfe de Hammamet est menacé par la dégradation naturelle et anthropique. Celle-ci touche la qualité de la vie et les intérêts stratégiques du pays. Les courants marins sont en majeure partie responsable de cette dégradation. Pour comprendre la circulation des eaux dans cette zone, nous avons déployé deux courantomètres. L’évolution du vecteur vitesse et de la direction du courant dus aux phénomènes de haute fréquence (marée) et de basse fréquence (vent, houle et pression atmosphérique) durant la période de l’enregistrement montre que la direction est parallèle à la côte dans les eaux de surface avec une vitesse qui peut dépasser les 20 cm.s-1. Cependant les courants près du fond sont plus faibles mais peuvent dépasser les 10 cm.s-1. Ces courants suivent l’isobathe -20m. Les courants mesures peuvent aussi être associés, en partie près du fond aux courants de la circulation générale des eaux d’origine Atlantique. L’analyse harmonique des niveaux d'eau indique que l'harmonique de la marée M2 est dominante. La marée est semi-diurne dans le Golfe de Hammamet L'analyse par la méthode de la fonction empirique orthogonale de la série des vitesses des courants de la marée au niveau de Golfe Hammamet montre que le courant de surface s’oriente vers le nord-est parallèle à la côte avec une vitesse maximale suivant l’axe principal de l’ordre de 5.9 cm.s-1. Le courant près du fond s’oriente vers le nord-ouest et suit l’isobathe -20 m avec une vitesse maximale de l’ordre de 2.2 cm.s-1 . Les courants de surface sont étroitement liés à l’effet conjugué du vent et de la houle et de la pression atmosphérique. La marée joue un rôle assez faible pour la circulation des eaux dans le Golfe de Hammamet. L’analyse des séries temporelles obtenues dans le golfe de Hammamet nous ont permis d’esquisser les caractéristiques dynamiques qui prévalent dans la région d’étude. Il a été démontré le faible marnage (12 cm) et surtout la présence de courants fort (15 cm.s-1) et dont la direction s’alterne entre le Nord et le Sud. L’allure des courants mesurés au large est typique d’une dynamique marquée par une structure tourbillonnaire.
  • Dynamique sédimentaire de la flèche sableuse de Kalaat Andalous (Delta de la Medjerda, Méditerranée)

    Hzami, Abderraouf; Amrouni, Oula; Sabatier, F.; Abdeljaoued, S. (2020)
    Bulletin de l'Institut National des Sciences et Technologies de la Mer de Salammbô
    Dans le cadre du programme de recherche institutionnel MOSBIOCLIM du LR02INSTM04, une étude multi approches a été entreprise pour suivre l’évolution morphodynamique multi–temporelle de la flèche sableuse de Kalâat Andalous (baie ouest du golfe de Tunis, Tunisie). L’analyse des variations du rivage entre les dates 1882 et 2016 permet de décrire sa genèse rapide dont l’allongement et le déplacement ont contribué à la création d’une lagune côtière. La diminution des apports fluviaux de l’embouchure historique de la Medjerda (Foum El oued) du fait de son avulsion vers le sud et la mise en place de barrages sur le bassin versant expliquent le recul très sévère du rivage EPR (End Point Rate) de -15,95 m±0.17 /an et de la construction de la flèche par redistribution latérale des sédiments charriés par la dérive littorale. A ces observations à long terme nous ajoutons une description morphologique inédite de la bathymétrie des petits fonds réalisée en 2019. La morphologie festonnée des corps sableux suggère un impact quasi frontal des houles lors des tempêtes marines ce qui contribuerait aussi à son ajustement dû au déficit sédimentaire.
  • Répartition du mercure dans les sédiments de surface de l’oued Meliane et de la frange littorale Rades - Hammam lif, golfe de Tunis (Tunisie)

    Yahyaoui, Asma; Ben Amor, R.; Tissaoui, Cherifa; Chouba, Lassaad (2020)
    Bulletin de l'Institut National des Sciences et Technologies de la Mer de Salammbô
    La frange littorale Rades – Hammam lif est une zone côtière fortement urbanisée et industrialisée exposée depuis longtemps à la contamination par les polluants provenant essentiellement de l’oued Meliane qui constitue la voie principale de la pénétration des ETMs. Le mercure est un élément connu par sa toxicité, il se trouve naturellement sur la terre et aussi dans l’environnement à cause des activités anthropiques intenses. Le Golfe de Tunis est influencé par les apports des principaux cours d'eaux exoréiques, provenant de diverses sources de rejets d'origine domestique, industrielle et agricole. La partie sud-ouest du Golfe de Tunis, en particulier la frange littorale Rades - Hammam lif, subit depuis des années les apports des rejets provenant de l’oued Meliane. La concentration de mercure au niveau de l’oued Meliane s’échelonne de 0,02 à 0,61 (µg.g-1) et de 0,01 à 0,97 (µg.g-1) respectivement pendant la saison estivale et hivernale. Le facteur d’enrichissement indique un enrichissement modéré à extrêmement élevé d’où la pollution provient d’une origine anthropique. Le facteur de contamination montre une contamination considérable à très forte au niveau de l’oued Meliane et les stations du littoral. La répartition spatio-temporelle de Hg varie en fonction des sources de rejets installées sur la zone côtière et sur la bordure de l’oued Meliane ainsi que la direction de la dérive littorale au niveau de la côte.

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