Wednesday, November 27, 2013

Surveillance Drones (AKA Google Earth Satellites) Tattle on Countries Underreporting Fish Catch

So this is cool: Google earth comes to the rescue again! But first, I'm going to blab about fisheries for a while.

You know what's weird when you actually think about it? Fish are one of the last major food sources that we rely on a hunter-gatherer (ok, a fisher) approach to supply commercial markets. Everything else, we farm, and while we are increasingly reliant on farmed fish, we still gather millions of tons/tonnes of fish protein from the oceans each year.

And you've probably heard that many fisheries (the global stock of one species) are nearing collapse (Figure 1), where their reproduction will no longer be able to keep pace with our consumption. So we gotta regulate, right? Yeah, but it's hard(1)! In addition to the fact that, on a global scale, fisheries management is a tragedy of the commons type of problem (2), in order to say how many fish we can get away with removing from the sea (right? because it's not realistic to to STOP fishing entirely), we have to know how many fish are out there.

Figure 1. Ack! Fishes disappearing! Over the past 60 years, the rate at which fisheries have been considered to have "collapsed" has increased. From Worm et al. 2008 Nature (Diamonds, collapses by year. Triangles, cumulative collapses, inset map shows fish diversity)

This sounds simple but it's not. There are literally hundreds of EXTREMELY smart people, in this country alone, trying to figure out how to figure out how many fish there are. Part of it is biology: Fish live in an incomprehensibly vast (ok, that's hyperbole, we can actually put a number on how vast) ocean that transcends national borders, and populations respond to complex global-ecological factors in natural cycles, like El Nino/ENSO, Pacific Decadal Oscillation, and sweeps week. 

The other part is the human factor. One way we try to tell how many fish there are is by counting the fish we catch and eat. This relies on people telling fisheries biologists the truth - and it turns out that is not as straightforward as it sounds (sensing a theme here?). Many countries don't have the resources to accurately count how many fish they catch, but some that do...still don't accurately report how many fish they catch.

BUSTED! By Google Earth (Figure 2).

Figure 2.  Oh, don't worry, FAO people won't come to the UAE to check on our catches, just make a number up! Satellite image of a fishing weir in the Arabian Gulf. This is a passive fishing trap, that strands fish in the trap when the tide goes out, allowing humans to walk out and pick em up.

Researchers at the University of British Columbia, including Fisheries Collapse Hotshot Daniel Pauly, used Google Earth to identify a major source of missing fish reports, weirs in the Persian Gulf (read all about it). So, ok, how big a deal can some fish traps be? Researchers estimated that the 1900 traps they saw from space caught 31,433 tonnes per year of fish! That's six times what was reported. Yeah, that makes it pretty hard to figure out how many fish and crabs are left in the ocean.

References and Miscellany:
(1) Here is where I acknowledge that, similar to every other environmental problem we face as humans, there are those who don't believe fisheries are indeed in jeopardy. Or, to be more fair, this is a contentious topic, with some arguing that projections of collapse are overstated. While I am not a fisheries biologist, I am acquainted with the literature, and the researchers who are, and am firmly convinced that there is more than enough evidence to demonstrate that we are, indeed, at risk of overexploiting most of the resources from the ocean. Here are some resources that I have found interesting, and at least somewhat balanced:

(2) What, primarily literature isn't entertaining enough?! That was a huge seminal paper in environmental ethics! OK Fine, Here is a talking head explaining the tragedy of the commons with cartoons.

Friday, November 15, 2013


I am somewhat ashamed to say that I am officially out of touch. Send me out on an iceberg, please, save yourselves from my contaminating cluelessness! I didn't know about this parody that was clearly made for this blog. But at least, thanks to Wimp, I was familiar with the song/phenomenon it was parodying. Without further ado, I give you, in all caps:


Thanks to Breanna* Sipley, who kindly alerted me to this opus of internet ingenuity.

*In the original version of this post, I got Breanna's name wrong - apologies. But her name is definitely Breanna.

Wednesday, November 6, 2013

Oh, just some stuff that happened to cross my desk.

I'm feeling like today has the Wednesday-day-after-election-day-and-nothing-I-voted-for-won blah's.  So, I'm feeling like sharing some marine science bonbons.

You're welcome:

First, a really inspired stop motion short of deep sea life as imagined by PES. These rusty tools wish they could be anglerfish! 

Next, did you know not one but TWO oarfish (Figure 1) washed up on the beach in CA recently?  These crazy guys look like eels, but are actually bony fishes, and typically live in the deep (not unlike that can opener in the last video).  Their appearances on beaches is highly correlated with an increase earthquake anxiety in humans. But remember, people, correlation does not imply causality. People also appear to be blown away by the fact that at least one of the fish was "filled with parasites", by which I mean, carrying a heavy parasite load, which, it turns out, might not be unusual for the species anyway. Humans, it turns out, are also filled with parasites (and mutualists, etc)...

Figure 1. Sweet-a** etching of an oarfish - not a leap to say this is actually a sea serpent and scientists have been lying to us.  Image credit: Wikimedia commons

Oh but speaking of parasites, this is horrifying/entrancing. 

The starfish die-off is getting a lot ("Researchers STUMPED"!!! Zinnnggggg!) of ongoing press, and researchers are moving quickly to get it figured out. Why do we care? Sea stars are the poster-child keystone predator. It's not just that we worry about their pretty faces (which are where, exactly?) turning to goo. Being a keystone predator means they have a huge influence on community structure (who lives in the neighborhood). Often they are called keystone because preferentially eat prey species that are better competitors, facilitating greater local diversity by allowing the prey that stink at competing to coexist with the better competitor (which, remember, is getting eaten by the starfish, and you don't want to experience that first hand).

Figure 2. Ouch. This reminds me of that scary story that was told at camp or whatever, where the girl was driving home from babysitting late at night, and something about a guy with a hook for a hand being on the loose, and she gets home after some chase or near miss and gets out of the car to discover a disembodied hook embedded in the side of her car....yeah. Photo Credit: Vancouver Aquarium

OK, that's all I have the brains for now.  Probably because parasites are eating the rest of my brains.  Oh well.