16 research outputs found
Changes in life history characteristics of Porcellio laevis (Isopoda: Oniscidea) along a cadmium pollution gradient in Sfax (Central Tunisia)
No full textShort term exposure to permethrin alters lipid classes and fatty acid composition of the unfed clam Donax trunculus from Tunisian coast (Southern Mediterranean)
No full text[EN] Permethrin (PER) is a pyrethroid insecticide widely used in agriculture. Dumped into the sea, this pollutant
causes considerable harm to living organisms. The present study was undertaken to evaluate the toxic effects of PER, on the commercial clam Donax trunculus, largely distributed along the sandy beaches of the Gulf of Tunis. A toxicity assay (72 hours) using different PER concentrations (0, 50, 100 and 150 µg.L-1) was carried out to study the effects of the pesticide on lipid class and fatty acid composition of mantle and siphons of D. trunculus. Results showed a significant decrease in total lipid content with exposure to PER. An increase in the percentage of neutral lipids driven by a concomitant increase of triacylglycerols (TAG) was found after exposure. On the other hand, polar lipids decreased following mainly the fall of phosphatidylethanolamine (PE) and phosphatidylinositol (PI). The fatty acid content was also significantly altered in exposed D. trunculus. Saturated fatty acids (SFA), polyunsaturated fatty acids (PUFA) and especially PUFA (n3) decreased significantly with PER exposure, while, monounsaturated fatty acids (MUFAs) showed significant decrease
with 50 µg.L-1 and no significant difference between control (0 µg.L-1 PER) clams and those exposed to 100 and 150 µg.L-1.[FR] L’exposition de courte durée à la perméthrine altère les différentes classes de lipides ainsi que la composition en acides gras chez le mollusque Donax trunculus des côtes tunisiennes (Méditerranée méridionale). La perméthrine (PER), insecticide pyréthrinoïde, est un ingrédient actif synthétique qui a été largement utilisé dans l’agriculture. L’utilisation de ce polluant au voisinage des plans d’eau menace l’état de santé de ces écosystèmes. La présente étude avait comme objectif d’évaluer les effets toxiques de la PER sur le bivalve marin Donax trunculus, fréquemment rencontré sur les côtes sablonneuses du Golfe de Tunis. Un essai de toxicité à court terme (72 heures) a été réalisé. Trois doses de concentrations croissantes en PER (50, 100 et 150 µg.L-1) ont été utilisées pour voir leurs effets sur la composition en acides gras et en lipides de D. trunculus. Les résultats ont montré une importante diminution des teneurs en lipides totaux chez les spécimens exposés à la PER. En outre, une variation importante des pourcentages des différentes classes lipidiques a été également signalée après l’exposition. Cette variation consistait à une augmentation des pourcentages de lipides neutres, due principalement à celle des triacylglycérols (TAG), parallèlement à une diminution de ceux des lipides polaires représentés essentiellement par les phosphatidyléthanolamines (PE) et les phosphatidylinositoles (PI). Le profil des acides gras a été également modifié de façon significative chez D. trunculus après l’exposition à la PER. Les teneurs en acides gras saturés (AGS), en acides gras polyinsaturés (AGPI) et surtout en AGPI (n-3) ont diminué de manière significative avec l’exposition, tandis que, celles des acides gras mono-insaturés (AGMI) ont chuté seulement après l’exposition à 50 µg.L-1This study was supported by the Tunis University of Sciences, the Biology Department, the research Unit of Physiology and aquatic environment and the institute of aquaculture of Torre de la Sal, SpainPeer reviewe
Metal toxicity and health problems linked to the consumption of ark shells (Arca noae l.) from a Tunisian coastal lagoon
No full textTrace elements (TEs) in coastal systems are a major problem as these elements contribute to the regular degradation of the environment because of their continuous inputs, persistence, toxicity and ability to concentrate in organisms through food webs. The levels of cadmium (Cd), Nickel (Ni), chromium (Cr) and lead (Pb) in the edible tissue of the edible bivalve Arca noae (L. 1758), sampled monthly from the Tunisian coastal lagoon (Bizerte lagoon) during 2013-2014, were determined by inductively coupled plasma mass spectrometry (ICP-MS). The impact of Cd, Ni, Cr and Pb on consumer health was considered and several parameters were used to assess the potential human risk (estimated weekly intake (EWI), target hazard quotient (THQ), total target hazard quotient (TTHQ) and target hazard risk (TR)). Results showed that Cd, Ni, Cr and Pb concentrations on a wet weight basis (mg kg-1 WW) in A. noae flesh from the lagoon of Bizerte were well below international food safety standards. Regarding health risk assessment linked to A. noae consumption, all sanitary indicators (EWI, PTWI, THQ, TTHQ and TR) related to Cd, Ni, Cr and Pb levels bioaccumulated in its flesh were below values considered at risk for human health. It can be concluded that continued consumption over long periods of this shellfish may not represent a potential risk to the health of consumers regarding Cd, Ni, Cr and Pb. Consequently, this shellfish can be considered safe for human consumption and does not pose any sanitary problems. This preliminary study presents prospects for the valorization of this seafood product in Tunisia's food sector
First Investigation in the Biochemical Analysis of the Invasive Crab Portunus segnis from Tunisian Waters
No full textAssessment of sex-related variability of biomarkers in sea urchin ( Paracentrotus lividus ) from Bizerte lagoon, Tunisia
No full textEffects of Culinary Methods on Nutritional Characteristics of the Edible Shellfish Noah’s Ark (<i>Arca noae</i>L., 1758) from Tunisian Coasts
No full textSeasonal variation of biochemical composition of Noah's ark shells (
No full textThe seasonal changes in biochemical composition of the edible bivalve Arca noae harvested from a Mediterranean coastal lagoon (Bizerte lagoon, Tunisia) were investigated from October 2013 to September 2014. Potential food sources and nutritional quality indices (NQI) were determined by analyzing the fatty acid profiles of their tissues during an annual reproductive cycle. Results showed that A. noae had moisture (73.8–82%) and protein (24.1–58.6% dry weight) as major components, followed by lipid (10.4–28.8% dry weight) and glycogen (4.05–14.6% dry weight). A. noae accumulated lipid and glycogen for gonadal development during both maturation periods (late autumn/late spring–summer) to be used during spawning periods (winter/late summer–early autumn). However, proteins were mainly used to support reproductive allocation and played an important role on the energetic maintenance. Lipid and glycogen were found to be significantly related to temperature, salinity and chlorophyll a (p < 0.05). An increase of condition index (CI) was observed during spring and early summer when both temperature and food supply increased. The total fatty acid (TFA) profile of Ark shells was dominated by polyunsaturated fatty acids (PUFA) (33.8–49.6%), followed by saturated (SFA) (29.1–43.1%) and monounsaturated fatty acids (MUFA) (20.77–28.3%). A. noae soft tissues were also rich in macro-minerals (Na, Ca and Mg). The analysis of fatty acid trophic markers revealed that the diet of A. noae during the year of study was based on mixture food mainly on phytoplankton followed by zooplankton and other sources (bacteria, seagrass and macroalgae). Furthermore, the nutritional quality indices have revealed that A. noae is an excellent source of nutrients and a healthy food for human consumption. These data are useful to the conservation of natural stocks of A. noae and the development of sustainable aquaculture production of this shellfish species in the Bizerte lagoon
Seasonal variation of biochemical composition of Noah's ark shells (Arca noae L. 1758) in a Tunisian coastal lagoon in relation to its reproductive cycle and environmental conditions
No full textThe seasonal changes in biochemical composition of the edible bivalve Arca noae harvested from a Mediterranean coastal lagoon (Bizerte lagoon, Tunisia) were investigated from October 2013 to September 2014. Potential food sources and nutritional quality indices (NQI) were determined by analyzing the fatty acid profiles of their tissues during an annual reproductive cycle. Results showed that A. noae had moisture (73.8–82%) and protein (24.1–58.6% dry weight) as major components, followed by lipid (10.4–28.8% dry weight) and glycogen (4.05–14.6% dry weight). A. noae accumulated lipid and glycogen for gonadal development during both maturation periods (late autumn/late spring–summer) to be used during spawning periods (winter/late summer–early autumn). However, proteins were mainly used to support reproductive allocation and played an important role on the energetic maintenance. Lipid and glycogen were found to be significantly related to temperature, salinity and chlorophyll a (p < 0.05). An increase of condition index (CI) was observed during spring and early summer when both temperature and food supply increased. The total fatty acid (TFA) profile of Ark shells was dominated by polyunsaturated fatty acids (PUFA) (33.8–49.6%), followed by saturated (SFA) (29.1–43.1%) and monounsaturated fatty acids (MUFA) (20.77–28.3%). A. noae soft tissues were also rich in macro-minerals (Na, Ca and Mg). The analysis of fatty acid trophic markers revealed that the diet of A. noae during the year of study was based on mixture food mainly on phytoplankton followed by zooplankton and other sources (bacteria, seagrass and macroalgae). Furthermore, the nutritional quality indices have revealed that A. noae is an excellent source of nutrients and a healthy food for human consumption. These data are useful to the conservation of natural stocks of A. noae and the development of sustainable aquaculture production of this shellfish species in the Bizerte lagoon
Oxidative stress and neurotoxicity markers in Paracentrotus lividus from Bizerte lagoon (North Tunisia)
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