Larval Enhancement — Bolinao

OPP-GRH8NBpermanent identifier · cite as oceanportfolio.org/p/OPP-GRH8NB

Published as: Enhanced larval supply and recruitment can replenish reef corals on degraded reefs. | Technique: Larval Enhancement | Genera: Acropora | Method: Gravid colonies of A. tenuis were collected and placed in aquaria ex situ, until spawning. The gametes were collected and placed in a fertilisation container with filtered seawater. Developing embryos were then transferred to rearing tanks, until competent. Competent larvae were then transferred into a bag for transportation to restoration site. Larvae were introduced into mesh tents (size??) placed on the reef, and maintained for 5 days, to allow larval settlement to occur. Settlement tiles ( … | Post-restoration monitoring: 36 months | Authors' conclusion: High mortality in the first 5 months of settled spats (Type III survival curve), both on tiles and on natural substrate within the larval enhancement plots. Survivorship stabilised after 9 months, with very low mortality of coral colonies past 1 year. Coral colonies grew and many reached reproductive size after 3 years (avg ~16 cm in 3 years). The results illustrate the importance of early rapid growth to reach a size where survival is more likely. | Lessons reported: Authors note that method is only suitable in locations where environmental conditions are suitable for reef corals to grow, but natural recruitment is limited. Furthermore, chronic disturbances and key threats must be effectively managed. | This record was compiled from a published source and has not been confirmed by the organisation that carried out the work. No contribution to the condition index is recorded: the source reports survival of transplanted material, which is not a measure of ecosystem condition.

Recorded result

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