Retinol binding protein 4 (RBP4): a novel orexigenic factor triggers hypothalamic appetite regulators via AMPK /AKT/mTOR signaling to promote feeding in Siberian sturgeon (Acipenser baerii) - Ni Tang; Yingzi Li; Yixiao Xiong; Zhaoxiong Yu; Fei Yang; Xueling Zhang; Xin Zhang; Bo Zhou; Zhiqiong Li; Bin Wang (Aquaculture, 2026)