PROBLEM TO BE SOLVED: To easily carry out the work of putting a seed shell, and when seeding a seaweed net in the sea, even if the bag is turned sideways or inverted by a stream of water, the seed shell put inside Provided is a seedling bag for seaweed aquaculture, which can prevent spillage of seaweed from the bag. SOLUTION: A seaweed aquaculture seeding bag A1 is provided inward of the loop-shaped outer frame member 1 and the outer frame member 1, and normally stops the seed shell in cooperation with another stopper member. The waterproof opening frame body 1 and the opening frame body having flexible stopper members 11 and 12 which form a gap 150 through which the seed shell is inserted between the flexible opening member 1 and the other stopper member by being flexibly deformed by an external force. An outer edge of the outer frame member 10 is attached with an edge portion of the opening, and the waterproof bag body 2 holds the seed shell. [Selection diagram] Figure 1【課題】種貝を入れる作業を容易に行うことができると共に、海で海苔網に種付けをする際に、袋が水流で横を向いたり反転したりしても、内部に入れてある種貝が袋からこぼれ出ることを抑制することができる海苔養殖用種付け袋を提供する。【解決手段】海苔養殖用種付け袋Ａ１は、ループ状の外枠部材１、及び外枠部材１に内方へ向けて設けられ、常態では、他のストッパー部材と協働して種貝を止め、外力で撓み変形することにより、他のストッパー部材との間に種貝を通す隙間１５０を形成する可撓性のストッパー部材１１、１２を有する、防水性の開口枠体１と、開口枠体１の外枠部材１０の外周面に開口部の縁部が取り付けられ、種貝を保持する防水性の袋体２とを備える。【選択図】図１
