The title "Marine Fishes of South-East Asia" suggests a focus on the diverse and vibrant marine life found in the seas surrounding Southeast Asia. This region, encompassing countries like Indonesia, Malaysia, Thailand, the Philippines, and Vietnam, is known for its rich marine biodiversity. The title hints at an exploration of various species of fish, their habitats, behaviors, and the ecosystems they inhabit in this part of the world. It may also cover topics like conservation, the impact of human activities, and the cultural significance of these marine species in the region.