Which method is often NOT used for attaching corals during out-planting?

The method of attaching corals commonly avoided during out-planting is the use of plastic cables. While they may appear to be a viable option for securing coral fragments to a substrate, plastic cables can lead to several issues in marine environments. They may not provide the necessary stability or durability that corals need for successful growth and establishment. Additionally, they can pose a risk of entanglement and can be harmful to marine life if they break or become loose.

In contrast, methods such as 2-part epoxy, Portland cement, and nails with cable ties are frequently employed for their effectiveness in securing coral fragments. 2-part epoxy is known for its strong bond and resistance to underwater conditions, making it a preferred choice for many restoration projects. Portland cement offers a robust, long-lasting attachment, particularly for larger coral structures. Nails supplemented with cable ties can provide additional security for coral fragments during their initial growth phase, allowing them to thrive in their new environment.