Evaluating the survival and growth rate of Acropora digitifera in wild and mesocosm systems
DOI:
https://doi.org/10.51200/bjomsa.v6i1.3809Keywords:
acropora digitifera, growth rate, survival rate, mesocosm , Pulau BidongAbstract
The growing interest in coral culture for restoration and biotechnological applications has prompted researchers to improve their understanding of coral culture, with a focus on ex-situ production. This study aimed to understand the performance of common hard coral, Acropora digitifera by examining their survival and growth at Pulau Bidong (in-situ) and in a mesocosm system (ex-situ). First, three branches were tagged from each of eight A. digitifera colonies (n = 24). Mortality and linear extension rate were recorded monthly, from July - November 2018. Meanwhile, five branches from each tagged colony were brought back to a mesocosm set up at the hatchery in the Institute of Tropical Aquaculture (AKUATROP), Universiti Malaysia Terengganu (UMT) for the ex-situ experiment. All coral nubbins (n=40) were then divided into two coral size groups: small (<5cm) and large (>5cm). After four months, small nubbins showed 100% survivorship, while large nubbins survived for only two months. In contrast, 67% of wild colonies remained alive. However, nubbins in mesocosm extent with almost 2-folds slower (0.091 + 0.027 mm day-1) than those in the wild (0.166 + 0.033 mm day-1). Coral nubbins in mesocosm form a basal self-attachment “disc” at the bottom. This suggests that fragmented corals invest more energy in self-stabilization, especially in the early stage of transplantation, which affects their linear growth. This study demonstrates the different demographic traits for corals in both the environments.
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