Sponge global demand for industry and research needs far exceeds supply from theÂ sea. Aquaculture is considered as the only viable method that can supply sufficientÂ and sustainable quantities of sponges. Aquaculture method is also one of efforts toÂ anticipate and avoid the over-harvesting of sponges in nature. However, cultureÂ methods need to be determined to provide the platform for commercial success. InÂ this study sponges (Callyspongia sp., Callyspongia basilana, and Haliclona sp.) wereÂ successfully cultured by transplantation method using polyethylene net with theÂ initial explant sizes of 1 cm, 3 cm, and 5 cm. The result showed that the spongeÂ growth and survival rates were dependent on the species. Callyspongia sp. andÂ Callyspongia basilana gave the highest growth and survival rates on the treatment 3Â cm with the final explants length reached 12.20 Â± 2.35 cm and 7.603 Â± 0.93 cm andÂ survival rates reached 98.33% and 36.67%. In contrast, Haliclona sp. had the highestÂ growth (21.67 Â± 0.25) and survival (95%) on treatment 5 cm. Nevertheless, among theÂ three species, treatment using 3 cm and 5 cm of initial explant sizes did not show aÂ significant difference. Therefore for the efficiency of explants use, the best initialÂ explant length for culturing the three species of sponges is 3 cm.
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