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Protecting herbivorous fish, to secure a future for corals
Herbivorous fish rarely go unnoticed. Their brilliant colors illuminate the reef to the delight of scuba divers. But more importantly, these iconic fish are also vital for the conservation of coral reefs.
Herbivorous fish feed on the algae that grow on corals and compete with them for light and oxygen. By eating the algae, these tiny fish play a big role in the survival of the entire ecosystem.
Species of these herbivorous fish include: parrotfish, which eat corals that break off the reef and excrete them as white sand; damselfish, which fend off the macro algae growth that kills coral; and surgeonfish, whose most famous representative is Dory from Finding Nemo.
But corals are quickly losing their greatest allies. Populations of herbivorous fish are dwindling, particularly in the Caribbean.
The overfishing of commercial species is driving artisanal fishermen to capture even the youngest herbivorous fish, preventing those species from replenishing their numbers.
The loss of these fish is one more threat to coral reefs, already fragile ecosystems that are increasingly vulnerable to climate change. Preserving our reefs will ensure we continue to enjoy the services they provide. Among other things, coral reefs act as fish hatcheries, natural barriers against storms and hurricanes, and the source of medicines that treat illnesses like cancer and Alzheimer’s.
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Organizations request Mexico list parrotfish as protected species
Parrotfish are vital to the health of coral reefs, and the Mexican State has an obligation to protect them. In a letter to the government, AIDA outlined the international obligations Mexico has to preserve its coral reefs, requesting that ten species of parrotfish be included in the nation’s list of protected species—a proposal spearheaded by the Healthy Reefs Initiative. Mexico City. Using arguments based in international law and knowledge of environmental treaties, the Interamerican Association for Environmental Defense (AIDA) requested that the Mexican government include ten species of parrotfish in the national registry of protected species, under Official Mexican Law 059, which is currently being updated. AIDA made the request through a letter to the National Advisory Committee for the Normalization of the Environment and Natural Resources, in support of a proposal the Healthy Reefs for Healthy People Initiative made in September in coordination with Casa Wayuu, the Kanan Kay Alliance and the Mexican Center for Environmental Law (CEMDA). “The species of parrotfish we are trying to protect play a vital role in the survival of coral reefs because they feed on algae which otherwise deprive the coral of light and oxygen,” said AIDA attorney Camilo Thomson. “Populations of these fish have declined drastically due to habitat degradation, pollution and climate change. Studies done by the Health Reefs Initiative, among others, have shown that 60 percent of the coral reefs in the Mexican Caribbean are in either poor or critical condition.” The organizations are calling for the following species to be listed under some category of risk in Official Mexican Law 059: the stoplight parrotfish (Sparisoma viride), the rainbow parrotfish (Scarus guacamaia), the blue parrotfish (Scarus coeruleus), the midnight parrotfish (Scarus coelestinus), the queen parrotfish (Scarus vetula), the princess parrotfish (Scarus taeniopterus), the striped parrotfish (Scarus iseri), the redband parrotfish (Sparisoma aurofrenatum), the redtail parrotfish (Sparisoma rubipinne), and the yellowtail parrotfish (Sparisoma chrysopterum). The letter outlines the treaties and conventions that oblige the Mexican State to adequately fight threats to species requiring special protection—species like herbivorous fish, which are vital for the health of Caribbean reefs and other marine ecosystems. These agreements include the Convention for the Protection and Development of the Marine Environment in the Wider Caribbean Region (also known as the Cartagena Convention), the United Nations Convention on the Law of the Sea, the Convention on Biological Diversity, the Ramsar Convention, the Convention concerning the Protection of World Cultural and Natural Heritage, the Tulum Declaration, and the International Coral Reef Initiative. “The letter also mentions the Advisory Opinion on human rights and the environment issued by the Inter-American Court of Human Rights,” Thomson added. “In that decision, the Court strengthens States’ obligations to protect human rights and acknowledges the close relationship that has with environmental protection.” Despite serving as fish hatcheries and natural barriers against hurricanes—among other key functions—coral reefs are very fragile and vulnerable to climate change, the consequences of which include ocean acidification, sea level rise and algal blooms. The latter are caused by untreated or inadequately treated wastewater being pumped into the Caribbean, and other forms of marine pollution. “The most recent report from the Intergovernmental Panel on Climate Change (IPCC) warned that the warming of the planet’s average temperature by more than 1.5 degrees Celsius would result in the destruction of reefs,” explained Melina Soto, Mexico coordinator for the Healthy Reefs Initiative. “It is therefore urgent States adopt adequate measures to preserve coral reefs, and one way to do that is through the protection of herbivorous fish.” Find more information about the case here. PRESS CONTACTS: Victor Quintanilla (Mexico City), AIDA, [email protected], +521 5570522107 Marisol Rueda Flores (Playa del Carmen), Healthy Reefs for Healthy People, [email protected],+521 9848770815
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Did you know coral reefs produce medicine?
“How can coral reefs contribute to modern medicine?” I wondered as I spoke to a group of doctors and nurses working on liver disease in Mexico. My uncle is part of the organization (Amihigo) and has long been interested in my work as a marine attorney with AIDA. When I got back from the meeting, the information I found backed up our discussion and clarified the link between our two worlds: coral reefs are natural, underwater pharmacies. The plants and animals living in reefs have developed chemical compounds to protect themselves against predators, fight diseases, and prevent the excessive growth of competing organisms. Corals have been recognized as an important source of new drugs to treat cancer, arthritis, Alzheimer’s, bacterial infections, viruses and heart disease, among other serious illnesses, according to the US-based National Ocean Service. The pharmaceutical industry has found corals provide value in the development of new products. Certain corals, for example, stimulate the welding of broken bones. Components of a Caribbean sponge allow for the creation of Zidovudina, a medicine used to treat HIV. Despite these discoveries, the medical use of coral reefs is considered underdeveloped. As an environmental attorney, what I take away from this realization is that if coral reefs are not effectively preserved, their great potential for modern medicine will never be fully realized. It’s a real threat. Studies estimate that 30 percent of the world’s reefs are already seriously damaged, and that 60 percent could disappear by 2030 due to water pollution, destructive fishing methods, overfishing, and other unsustainable human activities. Compounding these is the growing threat of climate change. Several Latin American nations are blessed with large areas of coral reefs that provide environmental and social benefits. But many don’t do enough to protect that wealth. Mexico’s coastline extends for more than 11 thousand kilometers, featuring 5,100 square kilometers of islands, reefs and cays. Its coral reefs span six major regions: the Gulf of California and the Western Mexican Pacific Coast, the Revillagigedo Archipelago, the Marias Islands, the South Pacific Coast, the Gulf of Mexico Reef Corridor and the Campeche Bank, and the Mexican Caribbean. The loss and degradation of these rich reef systems is a growing problem across the country. Unsustainable and poorly planned urban and coastal development is causing sedimentation and pollution, resulting in the growth of microalgae that rob light and oxygen, effectively suffocating the corals. In the Veracruz Reef System, the largest in the Gulf of Mexico, the expansion of the Port of Veracruz is doing just that. To protect reefs, it’s imperative that governments act with caution when approving land use in urban development plans to avoid damaging coastal wetlands (lagoons, bays, mangroves, coastal dunes and sea grasses, among others), and that they adopt adequate measures for wastewater treatment. The protection and restoration of coral reefs and coastal wetlands should be prioritized over economic interests and short-term economic benefits. Effective reef conservation can also be supported by good regulation practices. Measures to protect key species such as the parrotfish from overfishing, for example, would go a long was to preserving the health of coral reefs. And we now know that the health of those reefs is directly tied to our own. It’s important the health industry—from doctors and patients to scientists and pharmacists—join the call to conserve our coral reefs, natural medicine banks that can help guarantee our rights to a dignified life and a healthy environment.
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To keep corals healthy, we must protect herbivorous fish
We all know coral reefs are fragile environments, highly vulnerable to climate change and pollution. But did you know they also had to compete for light and oxygen with the tiny macro-algae that cover their surface? That’s why some of corals' best friends are herbivorous fish—species like parrotfish and surgeonfish that feed on algae, helping to keep corals healthy. But in the Caribbean, unsustainable fishing practices are causing a decline in populations of parrotfish (and other herbivorous fish), putting the health of corals at risk. That’s why, in AIDA’s marine program, we’re launching a large-scale project dedicated to the conservation of herbivorous fish throughout Latin America—focused on the nations of Colombia, Costa Rica, Guatemala, Honduras, Mexico and Panama. Herbivorous fish conservation The parrotfish is one of the most important fish living in coral reefs. They spend most of the day nibbling on corals, cleaning algae from their surface. They also eat dead corals—those bits and pieces that protrude from the reef—and later excrete them as white sand. A key element to maintaining sustainable fisheries is catching only adult fish—those that have already matured and reproduced. But in the Caribbean right now, people are fishing juvenile parrotfish. Though not a commercial species, parrotfish are being captured because they’re some of the only fish left in the reef. The irresponsible nature of commercial fishing in the region has caused a drastic decline in both commercial and herbivorous fish. “A key element of maintaining a sustainable fishery is catching only adult fish, which have already matured and reproduced. But what’s happening in the Caribbean is the fishing of young parrotfish,” explained Magie Rodríguez, AIDA marine attorney. Most fishing is done with gillnets and hooks, which cause high levels of by-catch—unwanted populations of marine species caught in commercial fishing. Harpoons and traps are also used, which prevent younger, smaller fish from escaping and continuing their life cycle. Surgeonfish and damselfish are two other herbivorous fish—both small and quite beautiful—falling victim to irresponsible fishing practices. Their popularity in tropical home aquariums has led to a decline in their wild populations. Remember Dory, from Finding Nemo? She was a surgeonfish, and the movie’s popularity led to an increased demand for her species in aquariums. What the movie didn’t tell you is that the surgeonfish’s small, sharp teeth are highly adept at chewing algae, preventing the plantlife from essentially choking coral reefs of oxygen and light. Conservation strategies AIDA’s project for the conservation of herbivorous fish in the Caribbean is in its initial phases. Our objective is the implementation of diverse strategies, across the six Latin American nations, to protect these fish and, by extension, the reefs they call home. “To restore the balance of the coral ecosystem, it’s necessary to achieve the recovery not just of herbivorous fish populations, but also of commercial species,” Rodríguez said. So we’re talking not just about fishing bans, but also about the general adoption of sustainable fishing tools that take into account the tourism potential of coral reefs. The project will also contemplate adequate wastewater management strategies, consumer education, and collaboration between governments, NGOs, universities and scientists. Corals are, among other things, a source of economic income and food for coastal communities that live from fishing and tourism. Plus, they are natural barriers against storms and hurricanes. “Corals do a lot for us and we have to take care of them,” Rodríguez added. “We’ve come to find that the best thing we can do to keep corals healthy is to protect the herbivorous fish that call them home.”
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