As some of you may know, the Lionfish is a warm-water species from the Indo-Pacific waters. Sporting venomous spines, they are a generalist, eating everything from fish nearly half their size, to crustaceans, shrimp, etc. Having been introduced in the early 1990′s off the coast of Florida, they are taking over the Gulf and Caribbean waters. Their venomous spines are an adaptation that indigenous species have no means of dealing with. Their presence has been devastating to an already challenged ecosystem. Starting from that one spot in Florida, and tracing back genetically to just 6 or 8 females released into the Gulf’s waters, they now cover a vast range, covering the entire Gulf and Caribbean region (see image further below. As generalists, they are destroying the balances of nature, consuming and growing unchecked. Sturdy, these beautiful fish are akin to the red-tailed hawks of North America; they can live on most anything and thrive in many conditions. Their only bottleneck now is cooler waters; They don’t seem able to withstand waters further north, so spreading to the UK along the Gulf Stream is unlikely.
The Gulf isn’t their first foray far from home, though. They and one of their natural predators, the Coronet Fish, have both crossed from the Pacific to the Atlantic already on their own, traveling through the Suez Canal to the Mediterranean. Initially spotted there in the early 1980′s, they have been held in check (to an extent) by the Coronets, which presumably eat the young Lionfish. And that is crucial in a species which can breed all year long in warm waters, each female laying as many as 2 million eggs a year. The Gulf has no Coronetfish at this time, so there is nothing to prey upon those 2,000,000 young — and that’s 2 million eggs per female.
NOAA, the Grand Cayman Islands and other concerned agencies and governments are very concerned about this invasive species, and rightly so. The mussel invasion is insignificant in comparison to the devastation being wrought by the beautiful and deadly Lionfish. Roatan reports that coral fish are down by 80%, and that the Lionfish are growing at an astounding rate of 15 TIMES as many as would would be found in their native Indo-Pacific waters.
In the Mediterranean, the challenge isn’t as significant because both made their way through the Suez Canal on their own, Nature’s balances traveling together, and the Mediterranean Grouper may also play a part in keeping them in check.
But in the Gulf, the only possible natural predators are Grouper fish and certain species of shark. Eels have been seen to eat them, but it is not known if they are later affected by the venom. Grouper spawning sites are under total restriction of any exploitation until 2019 in the Grand Cayman islands, but the Atlantic Grouper’s numbers are so low that they cannot be counted on to take the place of the Pacific Grouper, which is a natural predator in the Lionfish’s natural ranges. The notion of introducing Coronetfish into the Gulf may seem to have merit, but meddling is what has caused this catastrophe in the first place.
So why is the title of this article suggesting that they are lighting the way? In both cases, the introduction of the non-indigenous species to the Gulf waters, and the creation of the Suez Canal, man’s interference has caused this. (The Suez and Panama canals both link the Pacific to the Atlantic, removing the natural barriers which have existed for countless thousands of years.) In their natural waters, they have natural enemies. Nature has her own checks and balances, which evolve and change as needed. And eventually, Nature will balance these changes out as well, one way or another. But we may not care for the results, because things will get worse before they get better.
How is this lighting the way? It it is all too easy for us to put oceanic issues out of sight and out of mind. These two examples clearly demonstrate how human actions can have unforeseen and catastrophic effects upon the entire planet. We built the Suez canal so that transport by ship would not have to go around the Horn at the southern tip of Africa, and built the Panama Canal for the same reason, joining the Atlantic and Pacific without the hassles and perils of going around South America. Mariners may rejoice in some ways, but these natural barriers have been protecting balanced systems for a very long time. What these two examples demonstrate via separate causes and identical consequences, is that we cannot interfere with Nature safely. We cannot “manage” wildlife. (ED: Frankly, we can’t manage our own populations, let alone those of an other species.) The best we can do is to protect the environments from our own species. Now we’re struggling to kill off the invasive Lionfish, and developing ill feelings towards these beautiful beings. But it was us who caused them to be there in the first place. And the blame cannot be placed on whomever dumped those 8 females into Florida’s coastal waters. There is an entire industry which has been taking these fish from the Indo-Pacific for decades, selling them into captivity in our saltwater tanks, so we can have them as a decoration piece, and Ooh and Aah over them. That, too, was unnatural, and that is the real culprit behind the Gulf invasion.
We don’t bemoan the aquarium and pet shop enthusiasts though. We bemoan the Lionfish, and attack them. We intend to rectify the mistake by harpooning them, or capturing them in other ways and eating them. ”Isn’t that better than just killing them and throwing them out?” Perhaps it is… but the mindset behind it all is another matter entirely, and that needs to be taken to task.
We must see ourselves as one part of the global ecology, neither greater nor lesser, neither disposable nor essential. We must not be so arrogant as to act in contradiction to Nature. When we do, such disasters are the result. Whether it’s joining two distinct and separate bodies of water or trying to put Nature in a fish bowl, or tapping oil 5 miles beneath the surface, this planet cannot afford our arrogant indulgences. It is essential that we learn from these mistakes and promote a non-interference policy in all ways. Homo Sapiens is not yet quite wise enough to be meddling with Nature. Protecting the oceans means a hands-off policy on and in them.
Take pictures, leave footprints, if that much.