To easily adjust and fix a width of an opening portion of a storage portion accommodating a seed shell, a simple manufacturing process, excellent mass productivity, easy attachment and detachment to a laver net, excellent durability and handling property A seed bag for laver farming and a seed laid for a laver cultivation are provided.SOLUTION: A shape retaining member insertion portion 19 having an opening portion 15 at its upper end side and containing a seed shell, a holding shape inserting portion 19 provided at the periphery of the opening portion and having insertion ports 20 on both sides as viewed from the front, A shape retaining member 21 which is flexible and which is inserted into the shape retaining member inserting portion and holds the shape of the opening portion in an oval shape and a holding member 21 which penetrates the shape retaining material in the thickness direction of the accommodating portion 16 And a binding band 25 bundled externally to adjust and fix the width in the short diameter direction of the opening portion. The binding band includes a strap portion 26 formed in a belt shape and having a large number of locking portions 27 arranged on one side thereof and , And a head portion 28 which is provided at the base end of the strap portion and has an insertion hole 29 of the strap portion and a locked portion 30 to which one of the locking portions is locked.BACKGROUND OF THE INVENTION【課題】種貝が収容される収容部の開口部の幅を簡単に調整、固定でき、製造工程が簡素で量産性に優れ、海苔網への着脱も容易で、耐久性、取り扱い性に優れる海苔養殖用種付け袋及び海苔養殖用種付け構造体を提供する。【解決手段】上端側に開口部１５を有し種貝が収容される収容部１６と、開口部の周縁に設けられ正面視して両側に挿入口２０を有する保形材挿通部１９と、可撓性を有し保形材挿通部に挿通されて開口部の形状を長円形に保持する保形材２１と、保形材の下方を収容部１６の厚さ方向に貫通し収容部の外部で結束されて開口部の短径方向の幅を調整、固定する結束バンド２５とを有し、結束バンドは、帯状に形成され片面に多数の係止部２７が配置されたストラップ部２６と、ストラップ部の基端にあってストラップ部の挿通孔２９及び係止部の一つが係止される被係止部３０を備えたヘッド部２８とを有する。【選択図】図１
