An method for selective breeding of a fast-growing strain of lined seahorse, including: (1) selecting high-quality lined seahorse parents as a base population for selective breeding； (2) performing prenatal intensified breeding； (3) performing pairing and mating, and rearing the juveniles thereof； (4) performing selective breeding in three junctures with different selection proportions； (5) pairing the saved adult lined seahorses, wherein those with low vitality, having injuries on the body surface, or having a dysplastic brood pouch or gonad are culled, and a selection proportion of 10% for every generation is maintained thereafter； (6) repeating steps (2) through (5) for at least four times to obtain a high-quality strain of lined seahorse with improved weight and body length and stable growth. The method can be used for selective breeding of a new strain with high quality and high yield.
