An object of the present invention is to provide a floating fish reef that can detect a break of an individual mooring line in a structure having a plurality of mooring lines at an early stage. A floating fish reef 1 includes a fish reef body 2 having a configuration for collecting fish by floating in seawater, a plurality of main mooring lines 3 having first end portions 9 attached to the fish reef body 2, and a plurality of main moorings. The first anchor 4 is attached to each second end 10 of the rope 3 and floats in the sea with the first anchor 4 mooring the fish reef body 2 on the seabed via the main mooring line 3 with the fish reef body 2 floating in the sea. And a plurality of mooring line alarm units 5 having a configuration for issuing an alarm when the aircraft floats on the sea surface. The plurality of mooring line alarm units 5 are attached to positions that can reach the sea surface when the main mooring lines 3 in each of the plurality of main mooring lines 3 are cut. [Selection] Figure 1【課題】複数の係留索を有する構造において個々の係留索の切断を早期に発見することが可能な浮魚礁を提供する。【解決手段】浮魚礁１は、海水に浮いて魚を蝟集する構成を有する魚礁本体２と、第１端部９が魚礁本体２に取り付けられた複数の主係留索３と、複数の主係留索３のそれぞれの第２端部１０に取り付けられ、魚礁本体２を海中に浮いた状態で主係留索３を介して当該魚礁本体２を海底に係留する第１アンカー４と、海水に浮くことが可能で、かつ、海面に浮上したときに警報を発する構成を有する複数の係留索用警報部５と、を備えている。複数の係留索用警報部５は、複数の主係留索３のそれぞれにおける主係留索３が切れたときに海面に到達可能な位置に取り付けられている。【選択図】図１
