Fish life-history traits are affected after chronic dietary exposure to an environmentally realistic marine mixture of PCBs and PBDEs

Abstract

Polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs) are persistent organic pollutants that have been shown to affect fish life-history traits such as reproductive success, growth and survival. At the individual level, their toxicity and underlying mechanisms of action have been studied through experimental exposure. However, the number of experimental studies approaching marine environmental situations is scarce, i.e., in most cases, individuals are exposed to either single congeners, or single types of molecules, or high concentrations, so that results can hardly be transposed to natural populations. In the present study, we evaluated the effect of chronic dietary exposure to an environmentally realistic marine mixture of PCB and PBDE congeners on zebrafish life-history traits from larval to adult stage. Exposure was conducted through diet from the first meal and throughout the life cycle of the fish. The mixture was composed so as to approach environmentally relevant marine conditions in terms of both congener composition and concentrations. Life-history traits of exposed fish were compared to those of control individuals using several replicate populations in each treatment. We found evidence of slower body growth, but to a larger asymptotic length, and delayed spawning probability in exposed fish. In addition, offspring issued from early spawning events of exposed fish exhibited a lower larval survival under starvation condition. Given their strong dependency on life-history traits, marine fish population dynamics and associated fisheries productivity for commercial species could be affected by such individual-level effects of PCBs and PBDEs on somatic growth, spawning probability and larval survival.

Parental stressor exposure simultaneously conveys both adaptive and maladaptive larval phenotypes through epigenetic inheritance in the zebrafish (Danio rerio)

“…f H in the F 1 population f H in the zebrafish through all developmental stages is affected by temperature, oxygen availability and anthropogenic toxicants (Barrionuevo et al, 2010;Barrionuevo and Burggren, 1999;Burggren, 2017;Cypher et al, 2017;Horri et al, 2018). In the present study, exposure to crude oil induced bradycardia in control larvae derived from non-exposed parents.…”

Dietary bioaccumulation of persistent organic pollutants in the common sole Solea solea in the context of global change. Part 1: Revisiting parameterisation and calibration of a DEB model to consider inter-individual variability in experimental and natural conditions.

“…Finally, in a long-term perspective, this modelling framework allows to include contaminant transfer to the next generations and adverse effects from internal concentration (e.g., DEB-tox) on demographic characters (i.e., growth, reproduction, survival of the different life stages). Ultimately, predicted consequences of warming, diet modifications and contamination on these individual characters will allow studying their consequences on population dynamics (Alunno-Bruscia et al, 2009;Horri et al, 2018).…”

Sub-lethal Doses of Polybrominated Diphenyl Ethers, in Vitro, Promote Oxidative Stress and Modulate Molecular Markers Related to Cell Cycle, Antioxidant Balance and Cellular Energy Management

“…The chemistry of these compounds leads makes them stable for many years in the environment [3], where they are ubiquitous and persistent [4,5,6,7,8,9,10,11,12]. In fact, these compounds can be found both in the terrestrial and marine environment, as complex mixtures of numerous congeners [13]. They have been reportedly found in sediments, marine mammals, fish, bird eggs and also in human milk, serum, and adipose tissue [14].…”