According to the fisheries research institute, the temperature (20 to 23 C.) and salinity (32.5 parts to 1,000) of the waters off the west coast of Taiwan happen to be ideally suited for the fish to lay their eggs, and so local fishermen are blessed with their annual visitations.
根據台灣省水產試驗所高雄分所對台灣海域鯔魚資源的研究，冬季台灣西岸沿海的水溫（攝氏廿度至廿三度）、鹽度（約千分之卅二．五），最適合烏魚南下產卵，台灣漁民於是有福享受這份天賜良禮。