Chris Imhof, November 18, 2009


NOAA Teacher at Sea
Chris Imhof
Onboard NOAA Ship Pisces
November 7 – 19, 2009

Mission: Coral Survey
Geographic Region: Southeast U.S.
Date: November 18, 2009

Science Log

NOAA’s mission is to “protect, restore and manage the use of coastal and ocean resources.” The way NOAA does this is through science – a voyage like this may seem like moving from point to point and placing a really cool piece of technology in the water to see what’s on the bottom – but these are all tools that are being used to be able to carry out the tenets of protect, restore and manage.

We have visited half our sites now and have surveyed different environments in and out of Marine Protected Areas. Different environments, yet with commonalities – all the sites are near exposed “hard-bottom” or exposed limestone on the shelf bottom. There may be miles of sand waves and algae – but theses exposed, complex and bio-encrusted features are “oasis’s” for all sorts of ocean life – especially fish. As the ROV maneuvers across the sandy waves, it is usually the glint of a school of fish or reflection of a fish eye that provides a beacon to a feature. If these features are “oasis” habitats then they should be protected. Granted, these limestone blocks can do more damage to fishing line and gear, evident in the amount of line found in the high relief areas – but in the case of some of the North Florida MPA, we encountered the fragile deep water Occulina Coral which is vulnerable especially when nets are being dragged across these areas.

Another commonality noticed is the growing presence of the beautiful Lion Fish (Pterois volitans) – this native of Pacific waters was released intentionally or unintentionally in the early 1990’s around Florida and have since spread to areas above North Carolina and south to the Caribbean, especially along reefs and rocky outcrops. They join an infamous ranks of other invasive species including the European Green Crab, Asian Eel and Zebra Mussel. The Lion-Fish, besides having an array of venomous spines. has a keen strategy of “corralling” prey with their fins and eating them in one gulp. This will impact the small fish and crustaceans in these habitats as well as the added competition with indigenous or native predators such as snappers and grouper fish – which are currently commercially fished. This is where “manage” comes in – here is a “new” invasive species in that is growing in population and spreading geographically, impacting the habitat by out-competing, in some cases, the established predators – how can it be managed.

Especially when the Lion-fish has few natural enemies. The Lion Fish is a tricky one – as an invasive species, missions like this one help to understand the long-term impact the Lion-Fish is having on these habitats. Using technology like multi-beam mapping and ROV technology can provide data for scientists and in turn give councils, commissions and government the knowledge to manage these areas through smart-solution-based policy.

References:

coastalscience.noaa.gov/documents/factsheet_lionfish.pdf

http://www.magazine.noaa.gov/stories/mag135.htm

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