Fish culture in hatcheries and the keeping of aquarium fishes have much in common and are becoming more intensive all over the world. The success of both kinds of fish rearing depends on the quality of management and this depends, in turn, on understanding the biology of fishes and the aquatic environment in which they live. Fishes are aquatic and poikilothermic; their existence and performance are dominated by the quality of their environment. While conditions in large bodies of water such as seas and oceans are very uniform, smaller bodies of water, such as hatchery ponds and aquaria in which fishes are raised, are subject to more variable conditions. All species of fishes perform best under certain optimal conditions. The amplitude of such conditions is usually quite narrow. Understanding the relationship between fishes, their environment, pathogens, and parasites is very important in fish culture and is the basis for rational management. and the book cover these topics.
