This booklet presents some simple mobile or backyard hatchery systems and upgrade plans for existing carp hatcheries to produce seed of small fish, as well as minor carps, small catfish, etc. These systems require minimal installation and operational costs, compared to large industrial hatcheries, and are more energy efficient. They can be effectively implemented in community settings to enhance stock in reservoirs and wetlands. Many groups will find this document valuable, including small-scale farmers, hatchery operators, seed producer groups, farmer cooperatives, government agencies, and researchers.