Maximum (un)Sustainable Yield

Posted on By Bluegrass Blue Crab 10 Comments on Maximum (un)Sustainable Yield
Science

This post was chosen as an Editor's Selection for ResearchBlogging.orgIn 1954 and 1957 Gordon and Schaefer respectively described the idea of maximum sustainable yield (MSY) – that is, the amount of fish that could be taken by commercial fishing operations to maximize reproduction by the system year after year. Since then, it has been heralded as the mathematical panacea to fisheries management.

Gordon and Schaefer also described the maximum economic yield which threw price relations into the mix.  It describes the point at which the fishers will make the most money, accounting for revenue and their expenses. Note in the graph below the fold that the maximum economic yield (MEY) is below the MSY in terms of effort. Gordon and Schaefer imagined a private manager or government overseer that could calculate the MEY and regulate fisher behavior in order to meet it. The idea was meant to be win-win for the fishers and the fish.

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Ocean of Pseudoscience Shorty – Can methane bubbles sink ships?

Posted on By Andrew Thaler 1 Comment on Ocean of Pseudoscience Shorty – Can methane bubbles sink ships?
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One of the often cited causes for ships that mysteriously and quickly disappear are methane bubbles, released from sub-seafloor gas pockets. The story goes that as methane rises to the surface, the bubbles cause the density of seawater to drop, and any ships in the area suddenly lose buoyancy and spontaneously sink. This effect has … Read More “Ocean of Pseudoscience Shorty – Can methane bubbles sink ships?” »

Our favorite sea monsters – Ningen (#4)

Posted on By Andrew Thaler 12 Comments on Our favorite sea monsters – Ningen (#4)
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Sitting squarely in the middle of our favorite sea monsters is a new entrant in the world of cryptic sea monsters, the Ningen. The Ningen is a recent sea monster reported by Japanese fishermen working in the Antarctic. Allegedly, Ningens are up to 30 meters long, have a human like body, and a tail. Reports of what they look like seem to vary quite a bit, but the one consistent bit is that they have a human face and other human features.

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“You Could Walk On The Backs of Sea Turtles”

Posted on By Bluegrass Blue Crab 1 Comment on “You Could Walk On The Backs of Sea Turtles”
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Sea turtle research is unique in that many if not most of the people actually out in the field taking data are volunteers. By day, they are teachers, librarians, business owners, lifeguards, firefighters, students, retirees, you name it. If you’re curious, check out the network’s website. Sea turtles are the classic cute endangered animals that can really make someone care about marine conservation. And all of this data has gone to help produce population assessments such as this that confirm that while overall population is declining, some areas are actually increasing. But no where is back to the populations on which people could walk out to sea on the backs of turtles.

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Ocean of Pseudoscience Shorty – Bloop!

Posted on By David Shiffman 2 Comments on Ocean of Pseudoscience Shorty – Bloop!
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Our oceans have always been full of mystery, and those mysteries have inspired many fascinating stories over the centuries. We tend to think of sea monster stories as ancient superstitions, but the tale of the Bloop is less than 15 years old. In 1997, some US Navy hydrophones that had been in place for decades … Read More “Ocean of Pseudoscience Shorty – Bloop!” »

Bone-eating worms and contorted creationist thinking

Posted on By Andrew Thaler 10 Comments on Bone-eating worms and contorted creationist thinking
Science

I tend to avoid the creationist blogs. Every time I get sucked into that vortex of pseudoscience, I find the exact same debunked claims that were bunk when I was 12. There are better bloggers out there who have the energy and patience to systematically dissect the same tired old rubbish day after day, but I’m not one of them.

This claim, however, is special. There’s nothing new in the rhetoric behind it, it’s just another “how could this commensalism/symbiosis/mutualism evolve? It must be magic!” mantra. And the analysis isn’t terribly sophisticated, anyone could do the basic googling to find out why every argument in it is either wrong or deceptive. What’s special is that it’s about one of my favorite critters, Osedax – the bone eating worm.

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Chemistry of the Great Big Blue: Nutrients

Posted on By Bluegrass Blue Crab 1 Comment on Chemistry of the Great Big Blue: Nutrients
Science

The Great Big Blue looks like it contains nothing but water and maybe a little salt, especially out in the open ocean. However, this kind of sparse environment is exactly where the chemistry matters the most – it’s a fine line between not enough, too much, and just right. Given this, there’s no distinct myth here but an underlying unresolved question: what is the limiting factor that keeps the open ocean at low productivity?

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