Inspection and constant care are especially important, because the algae and other aquatic plants release oxygen by day and carbon dioxide at night. This means the milkfish have to come to the surface to breathe at night.
魚苗放養後需要經常巡視魚塭，夜間看守尤其重要。因為底藻和植物性浮游生物，白天在水中吸收二氧化碳，放出氧氣，晚上反而放出二氧化碳，所以池魚常因缺氧而把頭探出水面呼吸氧氣，俗稱「浮頭」。