“…modulation of hormone activity, synthesis, secretion, degradation, transport or receptor activity). There is mounting evidence that hormones of one endocrine axis influence other endocrine axes in juveniles and adults of multiple vertebrate taxa: notably in mammals (Dittrich et al, 2011;Jiang et al, 2001;Maran, 2003;Wagner et al, 2008), fish (Cyr and Eales, 1996;Duarte-Guterman et al, 2014;Hernández-Puga et al, 2016;Matta et al, 2002;Swapna et al, 2006), and amphibians (Duarte-Guterman et al, 2014;Warren, 1940); however, there is relatively less information on this cross-talk for vertebrate early life stages, particularly in fish. In lower vertebrates like teleost fishes, the presence of hormones from multiple endocrine axes in early life stages has been demonstrated (Cyr and Eales, 1996;Habibi et al, 2012;Leet et al, 2011), yet the underlying mechanisms and the extent of HPG and HPT axis cross-talk during these early life stages in teleosts are not clear.…”