sarahtaber,
@sarahtaber@mastodon.online avatar

Just got back from the coolest ag project of all time,

"What if you could turn abandoned oil rigs into seaweed farms to clean up the Gulf of Mexico?"

sarahtaber,
@sarahtaber@mastodon.online avatar

First off, WHY

As luck(?) would have it, the highest density of old about-to-retire rigs ~lines up with the dead zone caused by nutrient runoff.

The idea is seaweed farming can clean up the water. And it can replace jobs lost as economies transition away from fossil fuels.

Map showing the low-oxygen "dead zone" off of Louisiana, resulting from algae blooms fed by nutrient runoff from the Mississippi. It overlaps pretty well with the dense area of rigs off Louisiana.

sarahtaber,
@sarahtaber@mastodon.online avatar

Also, bivalve & deepwater coral reefs grow over the rigs' legs.

Reefs are otherwise hard to come by in the northern Gulf, & they're some of the best places to catch high-quality fish like red snapper & swordfish.

Here you can see the top, barnacle-heavy edge of the rig reef.

sarahtaber,
@sarahtaber@mastodon.online avatar

So in the Gulf of Mexico context, removing defunct oil rigs actually destroys a lot of reef habitat & prized fishing sites. : /

And since these rigs are on the northern end of a lot of corals' range, keeping them in place can help species survive heat waves.

sarahtaber,
@sarahtaber@mastodon.online avatar

This means there's a lot of interest in keeping old rigs in place and rehabbing/repurposing them.

Seaweed farming is a great 2nd life for these. Because again, seaweed can also help clean up one of the Gulf's other big environmental problems: nutrient runoff.

sarahtaber,
@sarahtaber@mastodon.online avatar

This is tube netting shaped long a long skinny sock, filled with seaweed. As it grows, the fronds will stick out of the netting.

The team will come back in a couple months to check on how much it grew, how the rope rigging has held up under local wave/weather conditions, etc.

sarahtaber,
@sarahtaber@mastodon.online avatar

Here comes the fun part: there is no seaweed farm tech that works for the Gulf of Mexico.

So far seaweed farming is either 1) hand-farm tropical seaweeds all year long in quiet, shallow waters around the Indian & Pacific, or 2) high-value kelp in pounding freezing Arctic waters.

sarahtaber,
@sarahtaber@mastodon.online avatar

The Gulf is kinda the worst of both worlds from a seaweed farming POV. Just like land agriculture, the US needs to automate seaweed to make it worthwhile. But the farms also have to be able to handle a hurricane.

Anyway, that's why we're starting with a few tests!

sarahtaber,
@sarahtaber@mastodon.online avatar

Pls enjoy another rig. Thanks to this guy, I have discovered my new favorite aesthetics:

"Mad Max but wet"

but also

"Yeah this thing's gonna fall over any day now, but don't worry there's a brand-new OSHA-compliant safety ladder"

naptowncode,
@naptowncode@mastodon.online avatar

@sarahtaber "Mad Max but wet" yo I think that was just Waterworld.

sarahtaber,
@sarahtaber@mastodon.online avatar

(before everyone comes in with "isn't that just Waterworld?"

yes and no? Waterworld sure happened and it was kind of a formative experience bc it happened I was at the right age to imprint on stuff like a baby bird, but Mad Max gets all the remakes. like these dang rigs, it lives forever)

qotca,
@qotca@mastodon.social avatar

@sarahtaber
Sarah. Please do a 'cast on this topic.

christopherd,
@christopherd@mastodon.nz avatar

@qotca @sarahtaber if you do a cast about this, then one of the questions that needs to be asked is why we need to use Toxic Plastic for the seaweed infrastructure?

Look to the local First Nations tribes along the coast. They will have knowledge about what kinds of materials can hold up in water.

christopherd,
@christopherd@mastodon.nz avatar

@sarahtaber Do not use toxic plastic for the rope. Goodness knows we have enough plastic in our bodies already.
Use things like woven flax, woven hemp, woven canvas rope.

sarahtaber,
@sarahtaber@mastodon.online avatar

@christopherd Natural fibers decompose. Unfortunately, using ropes that rot defeats the purpose of farming.

Since they weaken quickly, natural fiber ropes also break off & become "ghost nets" more often than plastic ones. They drift away and entangle and drown wildlife: sea turtles, dolphins, manatees, & whales.

I'm not a huge fan of plastic. Any other materials that do the job are welcome as they become available. However natural fiber ropes are not a good alternative for this use case.

kkarhan,
@kkarhan@mstdn.social avatar

@sarahtaber personally, I think such rigs can become cool artifical coral reefs....

vitriolix,
@vitriolix@mastodon.social avatar

@sarahtaber I was going to ask how does seaweed clean the ocean? I found the answer:

“Although carbon and carbon sequestration by kelp received most of the attention, kelp is actually much better at mitigating excessive amounts of nitrogen than carbon,” Umanzor said. “I think that’s a story that’s really underlooked.”

annaleen,
@annaleen@wandering.shop avatar

@sarahtaber this is amazing!! Is there a website where the team is sharing data and findings?

annaleen,
@annaleen@wandering.shop avatar
sarahtaber,
@sarahtaber@mastodon.online avatar

@annaleen Yep that's the one!

annaleen,
@annaleen@wandering.shop avatar

@sarahtaber thanks for telling us about it!! 💚

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