Fitness of two bivalves Saccostrea glomerata and Ostrea angasi exposed to a metal contamination gradient in Lake Macquarie, NSW Australia: Integrating subcellular, energy metabolism and embryo development responses

•Tissue Cu, Zn, Se, Cd and Pb increased along the metal contamination gradient.•No linear correlation between tissue and sediment metals.•Significant oxidative and energetic responses to metal gradient.•Significant embryo development response to metal exposure.