PROBLEM TO BE SOLVED: To provide a shellfish floating larva rearing ventilation apparatus capable of rearing microscopic shellfish floating larvae reared in a rearing tank while performing ventilation using intermittent or continuous water pouring.SOLUTION: A shellfish floating larva rearing ventilation apparatus includes a siphon drainage channel 3 provided in a rearing tank 1, which has a water supply channel 2 for rearing water and is used for shellfish floating larvae growing by intake of feed in a floating period, the siphon drainage channel having a suction drainage port 31 in the rearing water including an opening surface 31a open in the downward direction of the rearing tank to discharge rearing water in the rearing tank 1 upwards. The suction drainage port 31 is formed in a shape of a funnel expanding downwards. A water conduction member 6, on which a plurality of water conduction holes 61 having an opening diameter smaller than sizes of the shellfish floating larvae so as not to suck the larvae are formed, is mounted on the opening surface 31a. The siphon drainage channel 3 includes a downstream drainage port 32 formed upwards. The shellfish floating larva rearing ventilation apparatus performs rearing while performing intermittent or continuous ventilation by draining the appropriate amount of rearing water in the rearing tank 1 through the downstream drainage port 32 on the basis of the principle of a siphon.SELECTED DRAWING: Figure 1【課題】飼育水槽で飼育される微細な介類浮遊幼生を、断続あるいは連続での注水による換水を行いながら飼育可能な介類浮遊幼生飼育用換水装置を提供する。【解決手段】飼育水の給水路２を備え浮遊期に餌を摂取して成長する介類浮遊幼生の飼育水槽１に、飼育水中の吸入排水口３１の開放面３１ａが飼育水槽の下向き方向に開口し飼育水槽１内の飼育水を上向きに排出するサイホン排水路３を設け、吸入排水口３１を下向きに拡開する漏斗状に形成し、介類浮遊幼生よりも小さく吸入しない開口径の通水孔６１が複数形成された通水部材６を開放面３１ａに取り付け、サイホン排水路３の下流排水口３２を上向きに形成し、サイホンの原理に基づき、飼育水槽１内の飼育水を下流排水口３２から適量排水し、断続あるいは連続での換水を行いながら飼育する。【選択図】 図１
