National Geographics Monster Fish TV hosts Zeb Hogan and Stefan Lovgren have just released their new book, Chasing Giants, In Search of the World’s Largest Freshwater Fish. Zeb Hogan is a research biologist at the University of Nevada, an advisor to the UN Convention of Migratory Species, and our guest on The Blue Fish Radio Show. Zeb’s adventures around the world researching and filming over 30 one-hour specials for Nat-Geo TV have both amazed viewers world-wide and identified the five most common threats to the world’s largest freshwater fishes. A scientist and TV host who enjoys fishing as much as he does researching fish, Zeb has probably checked off every fish on the bucket list.