Florida scientists develop microalgae formula that reduces juvenile mortality of the Diadema antillarum sea urchin in the Caribbean

Scientists have created an innovative formula to nourish sea urchin offspring, which are essential for the coral ecosystems of the Caribbean. This advancement, led by the University of Florida, aims to restore reefs damaged by the loss of the Diadema antillarum species and the consequent increase in algae.

The formula that saves urchins and the future of the Caribbean reefs

Juvenile mortality of Diadema antillarum used to reach 99%, but an advanced diet of microalgae improves their survival. This nutrition allows a greater number of young urchins to develop to the appropriate size to be released into their natural habitat in Florida.

These urchins are crucial for the balance of the reefs, as they control the growth of algae that can suffocate corals by blocking their access to sunlight. Since the 1980s, diseases have drastically reduced their populations, accelerating the degradation of the reefs.

A team from the University of Florida, led by Professor Josh Patterson, is working to improve the survival of these “reef gardeners.” In their laboratory, they manage to raise urchins from the larval stage, but success has been limited due to high juvenile mortality.

Recent research by Casey Hudspeth, a master’s student, revealed that a diversified diet of microalgae increases the survival rate of the offspring. Hudspeth highlighted how even a small improvement in early survival can double the number of adults.

The formula has allowed juvenile urchins to reach a length of 38 millimeters, facilitating their subsequent transfer to institutions like the University of Miami for growth and eventual release into the reefs.

However, although the advancements are encouraging, experts emphasize that reef recovery also depends on addressing other threats, such as global warming and pollution. Nevertheless, this formula represents a significant step forward in the restoration of Caribbean reefs.