Friday, November 13, 2009

Thoroughly Schooled


I had a chance to do a bit of fishing on "River X" with Jeff Douglas when I was in Illinois earlier this week.
We managed 9 fish, including this chunky spotted bass that turned out to be the big fish of the day. Jeff outfished me from the back of the canoe, 6 to 3 in our brief and pleasant afternoon outing. Fish were scattered but active, with unusually high and clear water for November.
A back of the canoe schooling is just about the worst schooling there is so you can imagine I am not pleased with my performance. I was hitting the right targets on casts and fish seemed to be picking up the tube jig readily enough, but I seemed completely unable to deliver effective hooksets. Time in Belize seems to be eroding my bass fishing skills. Fortunately, Jeff is a nice enough guy not to rub it in...
...but boy did I deserve it.
I will ponder my failures and strive to do better next time out.

Monday, November 02, 2009

Lagoons are for kids


The fish Richie is holding here is a juvenile snapper caught in Placencia Lagoon, Belize. It may not look especially impressive, but when it matures this species can be found in huge spawning aggregations on the Mesoamerica Reef. In April and May, this and other snapper and grouper species congregate in huge schools to spawn.


These spawning aggregations are historically important to the fishers of Belize (and even as juveniles in the lagoon are important to local villages like Seine Bight). The shark in the picture above is a bull shark, but whale sharks also come to consume the free-floating gametes released by snapper. The spawning aggregations and the whale sharks whale sharks who feed on them are known world wide and provide substantial diving tourism income to the nation of Belize.

A study I am doing through the Southern Environmental Association in cooperation with Boston University and funded by the Busch Gardens Sea World Conservation Fund is looking at the role of Placencia Lagoon as juvenile habitat for commercial fisheries species in Belize. Toward that end we have been collecting juvenile snapper from fishers in the lagoon.

During recent history, however, the numbers of fish on these aggregations have declined dramatically. Despite some improvements in numbers of spawning fish inside marine protected areas like Gladden Spit and Silk Cayes Reserve, the number of fish currently present on the reef is dramatically lower than has historically occurred there. Fisheries managers need tools to help protect the spawning populations, restore the spawning aggregations, and preserve the fisheries that have been so important to the nation and ecosystems of Belize.

The question is, how may of these massive and economically important cubera snappers on the reef have spent their life in estuaries like Placencia Lagoon? If that number is substantial, the need to protect and restore these lagoons becomes an agenda of primary importance. Right now, a variety of development pressures around Placencia Lagoon are fundamentally changing the food web there. Sea grass is lost or languishing. Water quality is in decline. The fish in the lagoon appear to be declining.

By analyzing the micro-elements in the earbones of fish, the location of juvenile habitats can be inferred. Elements like strontium are normally higher in the matix of bone that is deposited while fish are growing near shore. Fish earbones or otoliths grow similar to the way trees grow, by adding rings around a central nucleus. By looking at the composition of rings deposited during different ages, we can determine the habitat being used at a specific time. This study is focusing on the upper part of Placencia Lagoon, where specific changes in habitat have been documented. Work by Eli Romero and Les Kaufmann is looking at sites near the mouth of the lagoon and further offshore.

Knowing the source habitat of cubera snapper and other commerically important species found on the reef will help guide management decisions on the Mesoamerican Reef, preserving the natural resources and wonder it provides.

Similarly, stable carbon isotopes are being used to evaluate changes in the diet of the Placencia fishery. Now that much of the seagrass in the lagoon has been lost, we hope to determine if the remaining fish have shifted their diet to other parts of the food web, or if their species have simply disappeared.

Bit by bit the pieces of the puzzle connecting Placencia Lagoon to the wider reef ecosystem are coming together. Many thanks to SEA, Busch Gardens and Boston University for their help in this endeavor.

Monday, October 26, 2009

Mangrove planting and something fun




Adrian found them while we were planting mangroves Saturday. It's nice to know the large charismatic wildlife is hanging in there. We didn't see any crocs though.

The old plantings were looking quite robust.


Here's the biggest tree of the lot, pushing 6 feet tall at only 15 months of age. Red mangrove don't grow normally grow quickly, but in these shrimp farms soils they certainly do.

We added 2,700 more new propagules. That's 21,500 for the area so far.



And of course, we finished the day with a swim at Flour Camp Creek. There is still a bit of salt water at the upper end (you can see it in the hazy lower layer here among the mangrove roots). Adrian says it is unheard of to have salt water in the creek this late in the year, especially this year that has had more than enough rain to flush the system.

Hmmmm.

Wednesday, October 21, 2009

Out like a Lion. Fish.


Red lionfish are quite beautiful...in the Pacific where they belong.

In the Caribbean, they are an invasive species and they are serious trouble. Escaped from a private aquarium in Florida during hurricane Andrew in the mid-80s, red lionfish now comprise up to 90% of the fish biomass on some reefs in the Eastern Carribean. I took the picture above of a lionfish brought to the office of the Southern Environmental Association in Belize. They are everywhere down here now.

Well guess what.

Someone has gotten the bright idea that fishers might be of some help reducing populations of this invasive species.

Here's an article in the Economist describing some of the details.


Spearfishers have been associated with declines in other species of fish...why not focus that effort on a species that is gobbling up everything else in sight and harming the reef? Lionfish rodeos are now all the rage. A fellow named Robby Thigpen is promoting the practice here in Belize.

Hmmm. Seems like I've heard that idea somewhere be(carpbusters)fore.

Good luck to Robby and everyone else willing to focus their fishing harvest on invasive species.

Monday, October 12, 2009

The North American Conservation Model


Time for more geeky conservation introspection.

Alas, I cannot pretend I found "The North American Conservation Model" in a serious academic pursuit. It was...dare I say it....on Facebook, specifically on the Sierra Club's Hunter/Angler Heritage page.

One fellow there was pretty keen to proselitize for this "North American Conservation Model" (NACM). Should I join the fold?

Here's a link to the Rocky Mountain Elk Foundation, a group who uses the model.

http://www.rmef.org/Hunting/HuntersConservation

I'm not much of a hunter (got cured of that by my uncanny ability to hit everything I shoot at without actually killing it) and the NACM is designed specifically for wildlife, not fishing. Yet there are some solid parallels between fish and wildlife conservation. The ISA Philosophies harmonize well with these, the main difference being the specificity of the Philosophies for smallmouth bass.

The differences are probably more interesting.

The NACM calls for a ban on commercial harvest of wildlife. Commercial fisheries are a global multi-billion dollar industry and not about to go away. Fish tend to have much more resilient populations than wildlife and have fared much better under human exploitation. Yet global freshwater fisheries have for the most part already been over-run. The current free fall of oceanic fish stocks suggests a fundamental transition is at hand there as well.

Modern fisheries may be about to give way to aquaculture just as the hunter-gatherer way of life gave way to terrestrial agriculture 10,000 years ago. The implications of this paradigm shift (and yes, that cliche fits perfectly here) are as vast and deep as the ocean. Could the sea come to resemble the agricultural landscapes our forebears created on land? Could the endless blue expanses that European sailors feared to even cross before the 15th century become a patchwork of aquaculture cages with a few gaps of wild ocean in between?

Impossible? A 19th century pioneer to the Illinois prairie would certainly have thought the endless, homogeneous rows of 20th century corn and soybeans were impossible. The swampy, impenetrable tall grasses they cursed and died upon for generations have now been pushed into the barest margins of the landscape. As the NACM rightly states, those remnant prairies, rivers and forests have been saved with substantial help from the people who hunt and fish them. Perhaps it will be fishers who defend and conserve the last few patches of wild ocean just as hunters and anglers have defended the land and rivers.

It intrigues me that the NACM defines itself as specifically North American. The principles for the model seemed to have evolved through the experience of the industrial era in the Northern Hemisphere. The wasteful buffalo hunter taking hides and tongues was gone by the end of the 19th century in the US, unhappily anachronized by his own destruction of the resource. It seems unlikely that conservation ethics ever slowed him down much. The regulatory structures that prohibit the practice today were put in place after the species and his livelihood was already degraded.

In contrast, the developing world in other regions is still caught in an awkward, uneven, leapfrogging evolution through and past the industrial age. It still has a walloping share of commercial hunters and "bush meat" while at the same time striving to conserve its natural resources and biodiversity. The regulatory effort to prevent people from chewing through populations of animals is fully in place there, if often overrun.

As was the case in pre-industrial North America, the poor are struggling to feed themselves (sometimes by catching animals and sometimes by catching animals to feed to the rich). Persuading such a person not to shoot or net deer, jaguars, peccary, macaws, bonefish, etc. has a much harsher moral dimension in the developing world than it does in modern North America where the safety net is much broader and economic opportunities abound (yes, even in a recession).

It strikes me yet again what a tremendous jackass a person has to be to tell hungry people not to take animals for food. Yet, it is almost a given that if the idle rich and bourgeois hunters had not come to the defense of game, wilderness and wildlife, the poor would have eaten their way through quite a few more North American species than they did.

And such are the choices many in developing countries are facing now.

I remember early in my graduate career sitting in a seminar, and hearing my department head declare that indigenous people shouldn't be allowed to live near national parks because they might hunt inside them...

...it is not a politically savvy thing to do, calling your department head an "eco-nazi". But I did. And I probably would do it again, even having suffered through the years of pay-back he dished out (especially having suffered all the years of payback he dished out).

That is not to say I don't see his point.

The problem still persists which induced my jackass of a department head to recommend ethnic cleansing for conservation. Where I work in Belize (ostensibly still a part of the North American continent), there are gill netters in Placencia Lagoon wiping out whole runs of snook in Santa Maria Creek. These fishers are living on the edge. They genuinely need the money they make fishing but they are also impoverishing us all.

Maybe the case can be made that we need some heartless sons of bitches to step up and ward off the hungry masses now and then. Certainly the law needs to be enforced and the gill netting needs to stop. But should they be exiled from lagoon?

I find it difficult to believe there's not a more moderate middle path.

People can't do better without opportunity. All the high moral aspirations we claim today were pretty much devised by people who were not in need. Not hungry. Not impoverished. Teddy Roosevelt set aside the National Parks, but he also worked to create better conditions for workers. Somehow that second half didn't make it into the NACM. It seems pretty clear that any notion of humane conservation will require a way out of poverty for the people using the resource.

The North American Conservation Model may not work so well in Belize. I am glad, however, to see it articulated.

It seems like a good place to build.

Monday, October 05, 2009

Night of the Living Toadfish



So...

...you've caught a few fish. And it's getting dark but you don't want to quit yet. Then you get another bite and you begin reeling in and you realize that you have not hooked your run of the mill snappper.

What appears at the end of your line has a huge mouth, glowing eyes, spines galore, freakish toad-like pectoral fins, mottled color, and a sickening slick shine, all of which you can just vaugely make out in the twilight.

I'm pretty sure this is a gulf toadfish or something very closely related. Yes, it does have poision spines. No, it was not fun to have in the boat.

This is a new species on my life list, but I don't ever want to catch a bigger one. Or a littler one.

Monday, September 28, 2009

Marine Debris Day

I spent Saturday, International Marine Debris Day, working with the Southern Environmental Association, the University of Belize and the Belize Fisheries Department cleaning up the beach at Hunting Caye in the Sapodilla Cayes Marine Reserve.

The beach pictured below has historically been a nesting site for hawksbill turtles, but use of the beach has declined over time as garbage from passing ships has accumulated there.

We made a pretty good dent.

Enjoy the pictures.