Humboldt Squid: the "red demon" moves into Southern California

Like something from Disney's Twenty Thousand Leagues Under the Sea, the humboldt squid is a formidable predator typically found in deep Pacific waters off of Mexico and Central America. Reaching up to five feet in length and as much as 100 pounds, it is fast and aggressive with a voracious appetite.

And it is beginning to appear in shallower water off of Southern California. In San Diego, during night dives, scuba divers are encountering groups of humboldt squid, and several have moved too close into the shallows and been washed up on the beach.

According to a recent AP news report,

"Research suggests the squid may have established a year-round population off California at depths of 300 to 650 feet, said Nigella Hillgarth, executive director of the Birch Aquarium at Scripps Institution of Oceanography. Divers this summer have been encountering them at about 60 to 80 feet down, they said. No one knows how many squid are in the shallow waters, but one biologist estimated they could number in the hundreds, or possibly thousands.

'Usually where there's one squid, there's a lot of squid, so I would assume that there's a good number,' said John Hyde, a biologist with the National Marine Fisheries Service in San Diego."

Scientists are not sure why the squid have moved further north or are entering shallower waters. Explanations range from global warming to loss of prey to a reduction of natural predators. On this last point, I have read studies that have explained the bio-dispersion of various species based on the predators that feed upon them. When the predators are gone, then the species in question is no longer "corralled" as it normally would and changes in bio-dispersion or migrations can occur. In the case of humboldt squid, sharks are one of its key predators.

Whatever the explanation for the squid's movement north, there is reason for some concern. They can pose a serious risk to unsuspecting divers and their voracious appetites can severely impact local fisheries. Scott Cassell, CEO of the Undersea Voyager Project, who has spent many years studying and filming humboldt squid, recently told me that in his studies he had predicted the potential for this danger as much as ten years ago.

Another possible example of the ramifications either climate change, overfishing, or loss of apex predators - or all of the above.

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Marine Protected Areas: scientists studying the impacts

The continuing efforts to establish marine protected areas (MPA) or reserves worldwide has been an important issue with many conservation and scientific groups for obvious reasons. Activities ranging from overfishing to pollution have needed to be addressed because of the negative impact they have on marine ecosystems and marine life populations. The juggling act has always been in trying to meet the needs or at least compromise with the various stakeholders: commercial fishing, recreational activities, conservationists, scientists, and more.

Challenging as it is, MPAs continue to be established and now a new challenge facing scientists is the careful monitoring of these areas to see what effects - good or bad - the MPA may be having. I was reading interesting information from a SeaWeb.org Marine Science Review (Marine Protected Areas & Reserves #288). Worldwide, there is a considerable amount of research taking place regarding MPAs. Some of the issues they are studying have to do with bio-dispersion - the movement of marine species within a given area. We humans may define an area as "protected" but marine species don't read the fine print and may not stay within safe borders. Depending on the size, sex, and bio-density, a species that moves into harvesting areas, outside an MPA's borders, could be severely impacted. On the other hand, species of less commercial value could profligate within the MPA and perhaps upset the overall ecosystem - one example I read concerned increased populations of parrotfish which consume coral.

While the overall concept of marine protected areas and reserves seems to make environmental sense, scientists are hard at work developing new methodologies and research methods to be able to properly monitor the long term consequences of our efforts to preserve and protect our oceanic resources.