colourful sponges and schools of vibrant fishes. And then, as we approached an old shipwreck, I laid eyes on her. She was beautiful, with olive-green skin and dark spots over her body, her large round eyes stared back at me as our dive team slowly approached. It reminded me of my youth in the Mediterranean Sea before large fish were wiped out, particularly, the large, beautiful groupers. Here, I found my fiancée (as I like to call her), an adult Goliath grouper, one of many in Florida’s Keys now, but a species with a rich and troubled history.
Across the world and throughout the centuries, sensational tales have been told of Goliath groupers stalking and attacking fishermen. A species that can grow to over 800 pounds, it’s no wonder Goliath groupers have forged such an imprint and captured the fascination of fishermen and divers alike. As rulers of their home territories, Goliath groupers are found in predictable places, around deep water shipwrecks, sink holes and natural ledges that provide them both protection and a place to ambush unsuspecting prey. They also aggregate in huge numbers during certain times of the year to reproduce. This predictable pattern has landed them in trouble. Due to rising demands for their meat, populations of Goliath groupers declined severely during the 1980s, and some populations disappeared altogether. Once listed as critically endangered, Goliath groupers have been rebounding in recent years, due to increased protection over the last two decades. But it isn’t just protecting Goliath groupers from overfishing that is important to the survival of their species. Even though groupers spend their adult lives in deeper waters, the species wouldn’t survive if it weren’t for an entirely different ecosystem – the mangrove forests that line the shallow coasts.
The vital link
Many people have never given a thought to mangroves, yet mangroves are vital to the survival of our own species, not just groupers. Mangroves are an immensely important habitat for a multitude of valuable fish species. As researchers learn more about the life cycle of groupers and other fishes, they are coming to recognize the various life stages and the importance of particular habitats, like mangroves, in supporting new generations of fishes. Because of the intricate branches and roots, mangroves provide the perfect sanctuary for juvenile fishes and invertebrates like crabs and shrimps. Here, they are safe from bigger predators, and can hide and hunt among the complex branching structures of the mangrove roots. In the case of Goliath groupers, juveniles will spend the first
five to six years of their lives living among these tangled undersea nurseries. In South Florida alone, it is estimated that up to 90 percent of commercially valuable sea life depends on the mangrove forests for some stage of their life cycle. Three species of mangrove inhabit south Florida’s coastline: red, black, and white mangroves. Along the edge of the sea, they can form dense aggregations, turning shorelines into forests. To survive this harsh environment, mangroves have special adaptations, including filtration systems that keep salt out and complex roots that anchor mangroves upright in shifting sediments. Their complex root structures help trap and recycle nutrients, as well as filter toxins from the water. Particularly important for us, mangrove forests are responsible for keeping our shorelines intact. They act as buffers, protecting the coastline from erosion due to major storms and hurricanes. And up in the treetops, mangroves provide nesting grounds for hundreds of bird species like brown pelicans, magnificent frigate birds and roseate spoonbills. Without the mangroves, coastlines erode, birds leave, juvenile fish loose their nursery home, and the link between open sea and coastal realm is lost.
Disappearing mangroves In the Florida Keys, as much as 60 percent of shallow mangrove forests have disappeared from coastlines. Worldwide, the declining trend is alarming. Scientists estimate that nearly half the world’s mangroves have been destroyed or are in dangerously poor condition. The greatest threats come from unsustainable development and land clearing for commercial enterprise or agricultural use. As global tourism increases, the demand for coastal development is likely to rise. However, great progress can be made if visitors understand the value of mangroves, and choose travel destinations that conserve and protect mangroves and the rich ecosystems they support. As I always say, everything is connected. The relationship between mangroves and the ocean is interconnected within the larger complex oceanic system. It amazes me to know that one of the bigger fish we find in the sea, the magnificent Goliath grouper, first begins its juvenile life swimming around the dangling branches of the mangroves, seeking shelter in the nursery grounds of nature. As our shifting climate leads to more frequent and stronger storms, mangroves are our first line of natural defense, protecting shorelines, homes, and people. We need mangroves to be healthy, strong, and productive so that our fisheries may flourish, our coastlines remain strong, and our natural world rebuilds.
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