Dietary Zn and the subsequent organotropism in fish: No influence of food quality, frequency of feeding and environmental conditions (pH and temperature)

Abstract

Trophic transfer of Zn in fish is affected by the type of food and environmental variables such as temperature. However, there is still a lack of knowledge regarding the effects of such factors on Zn organotropism. For this reason, a series of experimental studies have investigated how the distribution and the concentration of Zn is affected by some environmentally-relevant factors (food quality, food availability, water pH, and temperature) in turbot Scophthalmus maximus using radiotracer techniques. In three different experiments, Zn distribution in seven body compartments of juvenile turbot and the calculation of Zn concentration index (I) for each compartment were compared. Its distribution as well as its concentration in the body compartments of juvenile turbots were not affected by the experimental conditions tested. This apparent consistency in the Zn organotropism can be explained by the ability of the fish to maintain Zn homeostasis at non-toxic Zn concentrations in their diet. These results are important to better understand the trophic transfer of Zn in fish under realistic environmental conditions.

Trophic transfer of trace elements in a euryhaline fish, the turbot Scophthalmus maximus: Contrasting effects of salinity on two essential elements

“…More than >98% Mn and >88% of Zn were found in the muscles, the head, and in the remaining tissues. Similar findings were reported in previous studies (Pouil et al, 2017a) where >95% of the Mn and >86% of the Zn were found in the same tissues. The absence of changes in distribution of these element in the body compartments could be related to the fact that the experimental context is reflecting non-polluted conditions (i.e., no excess of Mn and Zn in the diet) and rather reflects normal physiological processes (Pouil et al, 2017a).…”

“…Furthermore, turbot became a few years ago a model species for trace element studies on fish. The turbot was recently considered as a biological model for numerous ecotoxicological studies related to the bioaccumulation of dietary trace elements (e.g., Pouil et al, 2018bPouil et al, , 2017aPouil et al, , 2016Pouil et al, , 2015. Studying this species is therefore relevant to assess the effect of salinity on the trophic transfer of trace elements in fish.…”

Trace elements in a Mediterranean scorpaenid fish: Bioaccumulation processes and spatial variations

“…The high As concentrations observed in S. porcus at PC could be related to As inputs in the marine environment by Cortiou sewage waters (Oursel et al, 2013) but also by high industrial effluents dumped into the Cassidaigne canyon located eastward, not far from PC and upstream from the main current (Millot, 1999). The higher concentrations of Zn compared to those of other essential elements, partly resulted from its crucial importance for living organisms, which is well studied in fish (Watanabe et al, 1997;Bury et al, 2003;Pouil et al, 2017). However, the high concentrations of Zn recorded in S. porcus in Marseille sites could also be attributed to its high level in the local environment.…”

A seasonal comparison of trace metal concentrations in the tissues of Arctic charr (Salvelinus alpinus) in Northern Québec, Canada

“…Relationships between Pb and δ 13 C would infer that increased feeding in marine influenced environments promotes reduced Pb accumulation, and is likely associated with reported significant differences between trace metal concentrations in freshwater vs. marine prey items (Evans et al 2005). Previously documented relationships between Cu and δ 13 C vary (Asante et al 2008;Ofukany et al 2014) and appear independent of species, habitat use, and/or feeding (Bradley and Morris 1986;Kress et al 1999;Pouil et al 2017). Thus, species-specific homeostatic regulation may have a greater influence on accumulation of Cu than environment in non-heavily contaminated locations, which has been suggested in previous literature (Eastwood and Couture 2002;Pyle et al 2005;Rajotte and Couture 2002).…”