‘Betta macrostoma & the largemouth fighting fishes – Observations on a noteworthy group of fighting fishes’ is a beautiful new book on the mouthbrooding 𝐵𝑒𝑡𝑡𝑎 species from southeast Asia. The book focuses on the B. unimaculata species-complex, all paternal mouh-brooders, most of which are little-researched or at risk from extinction in the wild. This fascinating group of fishes includes the species, Betta compuncta, Betta gladiator, Betta ideii, Betta macrostoma, Betta ocellata, Betta pallifina, Betta patoti, and Betta unimaculata, and in this detailed work, the author Horst Linke compiles his knowledge accumulated over years of collecting, breeding, and observing these species both in the wild, and in the aquarium.