On the excretion of zinc by the shore crab Carcinus maenas (L.) (original) (raw)
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Journal of Applied Biosciences, 2020
Objective : to evaluate the bioaccumulation of toxic metals (Pb, Cu, Mn) for two different species of crabs (i.e., Callinectes amnicola and Cardisoma armatum) and of vegetable Abelmoschus esculentus (family Malvaceae) commonly called Okra and consumed in the lower valley of the Ouémé. Methodology and results:To do this, the contents of three metallic trace elements (MTE) manganese (Mn), copper (Cu) and lead (Pb) were sought in water, sand sediment, vegetables and crabs by using a flame atomic absorption spectrophotometer in 12 water and sediment samples and then in 72 crab samples. To search for lead, manganese and copper, an assessment of the health risks associated with the consumption of these contaminated products was carried out using a simplified standard approach. The results showed that all the Abelmoschus esculentus vegetables had Mn and Cu contents exceeding the WHO regulations. The results also revealed higher Mn concentrations in the sediment compared to the other two cr...
1981
Une synthese bibliographique sur la toxicite des elements metalliques dissous pour des larves d'organismes marins, et plus particulierement pour des larves de bivalves d'interet commercial, a ete realisee pour dix metaux. Par ordre de toxicite, ce sont les sels organiques d'etain, le mercure, l'argent, le cuivre, le zinc, le nickel, le plomb, le cadmium, le chrome et le manganese. D'autre part, des problemes de synergie entre metaux, temperature et salinite ont ete abordes, ainsi que l'action des argiles en suspension dans l'eau.
Indian Journal of Fisheries, 2015
Cyprinus carpio is an important species in pond aquaculture as it can effect bioturbation of sediments which might influence benthic fluxes and biogeochemical processes at the sediment-water interface. In this study, the influence of common carp Cyprinus carpio on nutrient fluxes, specifically nitrification, denitrification and nitrate ammonification rates at the sediment-water interface in pond polyculture was investigated through field experiments and ex situ incubation. C. carpio enhanced the sediment oxygen consumption (SOC) from April to September (except in July). The fish did not influence the NH4+-N flux, but promoted NOx--N (NO2--N and NO3--N) release from the sediment to the water from May to September and it also promoted soluble reactive phosphorus (SRP) release from July to September. Nitrification, denitrification and nitrate ammonification were also significantly promoted by C. carpio. The results suggest that C. carpio can plays a very important role in the migration...
Canadian Journal of Fisheries and Aquatic Sciences, 1995
Growth and maturation of postlarval male snow crab (Chionoecetes opilio) in an exploited Gulf of Saint Lawrence population were elucidated using size distributions in beam trawl samples taken bimonthly from April 1991 to May 1992, moult and maturity indices, and measures of growth per moult. Males develop in three stages: immature, without spermatophores; adolescent, with spermatophores but undifferentiated chelae; and adult, with spermatophores and differentiated chelae. Males change from immature to adolescent after a puberty moult, and from adolescent to adult after a terminal moult producing a final carapace width (CW) >40 mm. The slope of the regression relating post- to pre-moult CW decreases after puberty. Carapace moult increments are the same at pre-terminal and terminal moults, for a constant premoult CW. Males recruit to the legal size of 95-mm CW at instar XII, ≈8.7 years or more after settlement. The slope of the regression of gonad weight on CW is less for adult tha...
International journal of innovation and scientific research, 2018
The bioaccumulation of four heavy metals (Zn, Pb, Cu and Cd) in Clarias gariepinus (Burchell, 1822), Chrysichthys nigrodigitatus (Lacepede, 1803), Mormyrops anguilloides (Linnaeus, 1758) and Coptodon rendalli (Boulenger, 1897) fluently fished and sold in Kingabwa district (Kinshasa, Democratic Republic of the Congo). At first, the results of physico-chemical analysis of water of inspected sites (2) revealed that the values of pH and temperature are in the standards as recommended by WHO and FAO, while the conductivity as well as the dissolved total solids in inspected sites are very weak.. Yet, the two sites are polluted by heavy metals. Secondly, the dosage of heavy metals by atomic absorption spectrometry revealed that all tested fish are polluted. However, the Cadmium has not been detected in the muscles of three fish: Clarias gariepinus, Coptodon rendalli and Mormyrops anguloides. Meanwhile, Coptodon rendalli species didn't reveal any presence of Lead in its muscles. The res...