Isolasi dan Ekspresi mRNA Gen Hormon Pertumbuhan (GH) Ikan Hias Tiger shovelnose catfish Pseudoplatystoma fasciatum (Linnaeus, 1766) pada Beberapa Stadia = Isolation mRNA and Gene Expression Growth Hormone (GH) of Tiger Shovelnose Catfish Pseudoplatystoma fasciatum (Linnaeus, 1766) on Multiple Stages