The present invention provides a floating body for aquiculture, which is resilient to external impact loads applied from the outside, and is not easily broken to be advantageous in environmental pollution prevention, and especially, in order to improve the use efficiency by being advantageous to weight lightening, which is produced by foaming-molding a foaming polymer composition as an active ingredient, wherein the foaming polymer composition is obtained by mixing 85 wt% of a thermoplastic polymer mixed with 94 to 98 wt% of a foamed resin composed of any one selected from a group consisting of polystyrene (PS), polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC) and polyurethane (PU) and 2 to 4 wt% of a pumice powder having the particle size of 1 to 2 mm^3 and 15 wt% of a foaming agent.본 발명은, 외부에서 인가되는 충격하중에 대하여 탄성적으로 대응함은 물론, 쉽게 부서지지 않아 환경오염방지에 유리하고, 특히, 경량화에 유리하여 사용효율이 향상되도록；폴리스틸렌(PS), 폴리에틸렌(PE), 폴리프로필렌(PP), 폴리비닐클로라이드(PVC), 폴리우레탄(PU) 중 선택된 어느 하나로 이루어진 발포수지 94~98중량%, 1~2㎣의 입자크기를 가지는 부석분말 2~4중량%가 혼합된 열가소성중합체 85중량%와； 발포제 15중량%가 혼합된 발포중합체 조성물을 주재료로 하여 발포성형하여 이루어지는 수산양식용 부유체를 제공한다.
