What is a significant disadvantage of ex situ nurseries?

The significant disadvantage of ex situ nurseries is that they require trained staff. Operating an ex situ nursery involves specific skills and knowledge related to marine biology, coral ecology, and nursery management. Trained staff are crucial for tasks such as propagation, caring for coral species, implementing disease prevention strategies, and ensuring optimal growth conditions. This requirement can become a barrier, especially in regions where such expertise is scarce, potentially limiting the effectiveness and sustainability of coral restoration efforts.

As for the other options, while low susceptibility to damage might seem like a benefit, it does not accurately represent a disadvantage. Low operational costs are often associated with challenges in maintaining expert staff and appropriate facilities. Similarly, simple maintenance is not a characteristic of ex situ nurseries; in fact, proper care requires continuous monitoring and specialized knowledge, further emphasizing the need for qualified personnel.