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  • #16151
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    xns
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    The rest of the world still sees the “occupy” movement as, “Just Americans rioting again for no reason”. I can’t tell what they’re hoping to accomplish, so far all I’ve seen are guys hanging out in parks recycling water…

    King Shannon of the Constitutional Monarchy of Logos.

    #16150
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    xns
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    They’ve done studies on both. As for a species that grows in seawater… most species of unicellular algae should be good candidates. You just need to adapt freshwater CO2 diffusers and find a way to prevent the pH from crashing. Or just pump large amounts of regular air through a ceramic diffuser…

    You’d need a large centrifuge to gather it all at the end of the cycle.

    King Shannon of the Constitutional Monarchy of Logos.

    #16135
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    xns
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    I’d start using something like the plastic cages I designed/built last year, courtesy of admiral doty and patri’s investment. I remember posting photos here some time ago, but I can’t seem to find them anymore. But basically you need to do the following:

    1) Build a cheap, bouyant, 2m x 2m x 2m plastic net-cage reinforced with 6062 aluminium. Each one shouldn’t cost you more that $1000 in materials.

    2) Find somewhere accessable to anchor it. It has to be close enough to shore that you can access it in a few minutes but far enough from pollution that you can eat your produce without worrying about contaminants. In asia you can lease ocean space from the government to build a farm. It costs $800 a year in Singapore for a 5000m2 plot. I’d imagine similar prices where you are Ellmer.

    3) Place fish that will attain a total maximum weight of 20kg for each cubic meter of water they have in the cage. For example, if you want to harvest grouper at 800g you should stock (20/0.8 x Volume) = SD

    4) While the fish are growing out, you can harvest the mussels or oysters that grow on the sides of the cage along with corals and sponges

    5) Establish contacts with a restaurant, fishmonger or pet shop who will buy your harvest

    6) Slowly expand your business.

    Tips:

    - Hang a light directly above the centre of your cage for a few hours every night when your fish are young, this attracts all sorts of tiny critters that your grouper will eat.

    - Clean un-sellable items off the cage once a week with a brush, this improves flow rates and allows desirable biofouling organisms(oysters) to grow.

    - Invite potential buyers to your farm, you can usually sell at a premium from there since it’s fresher

    - Don’t clean biofouling off anything that isn’t a boat, intake or cage. You’re growing an ecosystem, not a sterile environment.

    Ah ha! found a video:
    http://www.youtube.com/watch?v=2cwmralq_Ww

    King Shannon of the Constitutional Monarchy of Logos.

    #16133
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    xns
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    Hi Conrad, that’s exactly what I’m doing over here in Singapore. We’re a polyculture farm that grows several species of macro-algae from the waste of our predatory fish to feed our prawns, lobsters, herbivorous fish and abalone.

    In fact, ALL species of “seaweed” contain oil. You see, “oily fish” like sardines get their oil from the microscopic algae that they eat, they don’t actually produce it themselves. And larger ones like Tuna and Marlin get their oils from sardines.

    What some associates over at James Cook University have done is grow massive amounts micro-algae from the CO2 generated by a fossil fuel power station, then separate the algae into carbohydrates and oils for sale.

    Hope that sheds light on your thoughts.

    King Shannon of the Constitutional Monarchy of Logos.

    #16064
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    xns
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    I understand your intended strategy, I’m just pointing out that the genus might not be suitable for what you intend since they’re more akin to Siberian Tigers than American Bison. It might make more sense to ranch a herbivore like Chanos chanos, the milk fish. They’re extremely easy to breed and are immune to most kinds of parasites. They’re filter feeders and require no feeding. This monoculture system works in almost every concievable spot where you’d place a seastead.

    If you’re thinking to take a polyculture approach though, grouper can be kept with things like lobsters, crabs and shrimp, which are their preferred natural prey items as well as things like sea cucumbers, oysters, mussels and edible snails. Milk fish work well in those environments as well. The idea there would be to build the ecosystem and manage it, much like what Ted Turner has done with bison. This does however, require massive(Several square kilometers) tracts of “land” in the form of reef no more than 15m below the surface.

    But I believe you mentioned your preference for wide flat structures so this might work very well in your favour. And you could incorporate tourism into the agriculture model as well. Which is actually what I’m attemping over here in Singapore.

    The nice thing about marine ecosystems is that so much of it is harvestable from predators, herbivores and scavengers. Where in terrestrial systems you would only harvest bison and ignore all the rodents and insects.

    Drop me an email if you need help, always willing to assist the more serious members =)

    King Shannon of the Constitutional Monarchy of Logos.

    #16058
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    xns
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    The average density of concrete used in floors and load bearing walls is 2,200kg to 2,400kg per cubic meter. Hope that helps.

    King Shannon of the Constitutional Monarchy of Logos.

    #16057
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    xns
    Participant

    ellmer, I should point out a few errors I noticed;

    1) Grouper of any species are just as succeptable to disease as any other fish. In fact, most of our mortality is the result of common parasites like Cryptocaryon irritans, Amyloodinium ocellatum or a secondary infection arising from the parasitic infection. Using trash/bait fish compounds the problem because grouper tend to accumulate intestinal parasites and heavy metals. Though probably less of a problem where you’re from than over here.

    2) Being large predatory fish, grouper need to be sorted on a weekly basis according to their size or else they start canibalizing smaller fish. This is especially true if they associate fish with food. As a guide, my farm has survival rates in the 70% – 90% range while the industry average(Singapore) for farms that don’t do weekly sorting is 3%.

    Still, as i said before, even with 3% survival rates, it’s a profitable business if you know where and how to market your products. That fish will sell for about US$20/kg if you can get them to China or Hong Kong live.

    King Shannon of the Constitutional Monarchy of Logos.

    #16056
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    xns
    Participant

    If any of you are thinking of getting involved in fish farming I’d say go for it. There’s relatively little competition and the profit margins are absolutely massive if you end up in any country that isn’t scandinavian, especially asia since we have a strange aversion to scientific methods.

    Here’s my company’s FB page: http://www.facebook.com/pages/OnHand-Agrarian/267990176567810

    And here’s a video of our farm manager feeding the fry our quarantine tanks: http://www.youtube.com/watch?v=evb6g_NuFoI

    King Shannon of the Constitutional Monarchy of Logos.

    #15762
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    xns
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    On a practical note, Barrels are easier to find in our region and there’s far less chance of them disintegrating and finding their way into plankton feeding fish while carrying hydrophobic pesticides. That and styrofoam soaks up water over time. Anyway, I’ll just say from experience that styrofoam with black plastic coverings didn’t stand up to UV, friction and animal life very well. Barrels on the other hand are still perfectly intact.

    King Shannon of the Constitutional Monarchy of Logos.

    #15760
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    xns
    Participant

    Perhaps you should start by anchoring a network of buoys outside territorial waters and building a small island of plastic barrels on it.

    King Shannon of the Constitutional Monarchy of Logos.

    #15577
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    xns
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    What makes you think seasteaders will be any different from anyone else in the world?

    King Shannon of the Constitutional Monarchy of Logos.

    #15576
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    xns
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    There’s a healthy population of members that aren’t even looking at setting up inside EEZs, Personally, I’d set up far away enough that I could claim my own EEZ.

    King Shannon of the Constitutional Monarchy of Logos.

    #15564
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    xns
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    Why not just have a covered sump outside, that way you can keep your nitrate control elements in full sunlight while your livestock remain indoors. A few meters of hose seems like a cheap solution. And you’ll never run into the problem of an exposed powerhead since it’ll always be in the grow-out tank.

    Anyway, let me know if you need help, I’ve some experience with tropical food fish and recirculating systems.

    King Shannon of the Constitutional Monarchy of Logos.

    #15563
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    xns
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    There are several other reasons for packing amenities as close together as possible; maximizing use of infrastructure, defensibility, Highrises have nice views, transport efficiency. Stuff like that.

    But of course, that’s entirely dependent on the private developer, I’m just government. So I’ll definitely build a city with as large a footprint as possible, but my own property will be several floors high and deep.

    In the meantime it looks like the best approach will be to start setting money aside for several smaller versions that concrete plate you mentioned.

    King Shannon of the Constitutional Monarchy of Logos.

    #15560
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    xns
    Participant

    I’d definitely need the volume eventually, but as you’ve pointed out, it would make more sense to build the floors one at a time. Would UT be possible though? To add a floor on top every now and again if you needed to expand? That would make things very incremental…

    King Shannon of the Constitutional Monarchy of Logos.

Viewing 15 posts - 1 through 15 (of 229 total)