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Harvesting Blackworms


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#1 Auban

Auban
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Posted 05 May 2019 - 12:37 AM

i debated about adding this to my blackworm thread, but figured it would be better served as its own thread.  the other thread was about me discovering black worms and learning how to collect them.  the purpose of this thread is to inform everyone of the process i now use to harvest black worms.  i have already worked out most of the bugs and figured out how to make it worth the time it takes to do it.  this process can be used on any fishless pond that has lots of duckweed.  duckweed and blackworms, of course.  

 

 

i have been meaning to make this thread for a while now, but life kept getting in the way.  anyway, i finally managed to take pictures of the whole process, so now i can share, in detail, how i harvest live blackworms from my pond.  i imagine you could do this in just about any fishless pond that is surrounded by mud and covered in duckweed.  apparently, blackworms live almost everywhere. 

 

anyway, first step is to collect duckweed.  the worms crawl out of the mud surrounding the pond and into the duckweed, presumably to feed on the dead duckweed that gets stuck in the floating mats.  here is what it looks like at our place:  http://imgur.com/gallery/jbGTNm3

 

all of the duckweed has blackworms in it, but not all in the same concentrations.  i typically find more around the edges, so thats what ill usually scoop up first:

http://imgur.com/gallery/S2w9Ro0

 

ill usually check what i scooped up to make sure im not wasting my time with it.  if i see a few blackworms wriggling around, ill usually keep it.  in this pic, you can see a couple mature adult worms right away:  http://imgur.com/gallery/GPCNXQB

 

its a good idea to always check your net before you dump the duckweed into the bucket...  sometimes stragglers like to hitch a ride:  http://imgur.com/gallery/LOrlJs7

 

http://imgur.com/gallery/KHOuk25

 

even if the duckweed does not have a lot of visible worms, it usually still has some worms in it.  if i were spending all day collecting worms, i wouldnt toss any of it out.  but, i only had a couple hours to do everthing and take pictures.  if a clump of duckweed looks like it has no worms, you can still set it aside and wait a day.  the worms that are present will go straight down.  if you do this on a tarp, it would be easy to go back the next day and collect the worms from underneath all the duckweed.  my daughter found this old clump of duckweed and inspected it: http://imgur.com/gallery/MbSGBhQ

 

underneath the duckweed, she found a bunch of worms:  http://imgur.com/gallery/k7Nrt2C

 

when we feel like we have enough duckweed to get a decent amount of worms, we bring it up to the house and use a tall feed bin to separate the live duckweed, which floats, from detritus and worms, which sink.  we are currently using a feed bin, but a large trash can or 50 gallon drum would work just fine too.  all we do is swirl the duckweed around in the water to shake loose anything that will sink:  http://imgur.com/gallery/ciDTIFc

 

once we have scattered a bunch of duckweed beneath the water, we wait about 30-45 seconds for the live duckweed to float up and for everything else to sink to the bottom:  http://imgur.com/gallery/mbNZd82

 

if we work too fast, we wont give the worms time to fall away from the duckweed.  because we only have one bin at the moment, we inspect the cleaned duckweed for worms before we remove it from the bin.  after i get a couple more, i probably wont have to do this, ill just be mixing up duckweed in one bin while the others are settling:  http://imgur.com/gallery/A85P0X8

 

the cleaned duckweed goes into a container and will get fed to koi, returned to the pond, or put out in our garden: http://imgur.com/gallery/w5eJjUk

 

after we have gone through and cleaned all of the duckweed in the bucket, we let it set for about 15 minutes and then pour off the water:  http://imgur.com/gallery/aGXMQGi

 

at this point, its important to pay attention to make sure you dont pour out the mulm.  the gunk at the bottom contains all the blackworms:  http://imgur.com/gallery/6roJpmg

 

all the sludge at the bottom gets poured back into the bucket and brought inside:  http://imgur.com/gallery/sjGhkDo

 

for the next step, we pour all the sludge into a small aquarium fish net in order to condense it.  condensing it makes it easier to handle for the next step:  http://imgur.com/gallery/Cx8H8j3

 

we lay a net, or any kind of mesh really, across a filled aquarium.  we take a small ball of the sludge and spread it over the surface.  we then take a power cord, running off of an adapter so the voltage is low, and zap the worms with exposed wire.  the electricity is low enough that i cannot feel any voltage when i am holding both wires, but its enough to evoke a response in the worms.  dont let the wires tough though.  even though it isnt enough to shock you, it will still spark if the wires touch:  http://imgur.com/gallery/RmrjSUA

 

the worms will scatter, leaving most of the detritus in the net/mesh: http://imgur.com/gallery/U3OSTWm

 

we basically repeat the last step until we have gone through all the sludge.  we dont throw the sludge away at this point though.  it still has a bunch of worms in it, so we put the spent sludge in a bucket to let the worms remaining worms rest and then run them through one more time.  we will then take all the worms we collected and run them through a smaller mesh, using the same voltage method.  after going through just two buckets of duckweed, this is the result:  http://imgur.com/gallery/E7811lz

 

i dont know exactly how many blackworms that is, but its more than enough to feed all of our fish for quite a while.  it also keeps my daughters salamander larvae fat and happy:  http://imgur.com/gallery/Cjla6m9

 

anyway, thats pretty much the whole process.  if i were to get a few more bins and set up actual stations, i could probably produce about five times as many worms in the same amount of time.  the process takes about an hour when all said and done, but over half of that time is spent waiting for stuff to settle out.  right now, its easy to get a pound or two of blackworms every evening.  i hope to refine the process well enough to produce about five pounds a day in the summer.  im hoping that when my daughter gets old enough to start wanting money, she will harvest and sell some of them.  in the mean time, i will be looking into ways to increase the ponds production.  right now, the only thing that is feeding all those black worms is decaying duckweed.  i imagine tossing some kind of high protein feed out there might increase their numbers a bit. 

 

so, there you have it.  if you happen to find a fishless pond with lots of duckweed, check it out.  you might just have a free source of black worms.


"The ecologist is continually having to look at the aspects of nature with which he is unfamiliar and perforce must be an amateur for much of his working time.... professionals may carp at omissions, misconstructions, or even downright errors in these pages. perhaps ultimately they may forgive them for the sake of the overall vision that only the amateur, or the ecologist, blithely sets out to experience."G. Evelyn Hutchinson

#2 Matt DeLaVega

Matt DeLaVega
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  • Ohio

Posted 05 May 2019 - 12:47 PM

Very cool. Wonder if you could put mulm on a screen just above a tank of water with a heat lamp above it? Might cause the worms to try to escape the heat and go through screen into water. I am not certain that is any easier than low voltage though. I am inspired, I tried to find some today in a duckweed covered pond. No luck,


The member formerly known as Skipjack


#3 Doug_Dame

Doug_Dame
  • NANFA Member

Posted 05 May 2019 - 01:23 PM

Wow. That's an epic post. And considering the food value and retail price of blackworms, a great How-To for anyone with a pond. Or access to another local source of duckweed in volume.

 

Thanks for writing it up and sharing!!!


Doug Dame

Floridian now back in Florida
 


#4 gerald

gerald
  • Global Moderator
  • Wake Forest, North Carolina

Posted 09 May 2019 - 04:02 PM

Great documentation job!  A guy on Facebook, Marco Haupt, uses mesh vegetable bags (onions, oranges, etc) stuffed full of old vegetable scraps to harvest wild blackworms in Germany.


Gerald Pottern
-----------------------
Hangin' on the Neuse
"Taxonomy is the diaper used to organize the mess of evolution into discrete packages" - M.Sandel


#5 Auban

Auban
  • NANFA Member

Posted 13 May 2019 - 07:47 PM

Great documentation job!  A guy on Facebook, Marco Haupt, uses mesh vegetable bags (onions, oranges, etc) stuffed full of old vegetable scraps to harvest wild blackworms in Germany.

i have GOT to try this...


"The ecologist is continually having to look at the aspects of nature with which he is unfamiliar and perforce must be an amateur for much of his working time.... professionals may carp at omissions, misconstructions, or even downright errors in these pages. perhaps ultimately they may forgive them for the sake of the overall vision that only the amateur, or the ecologist, blithely sets out to experience."G. Evelyn Hutchinson

#6 mattknepley

mattknepley
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  • Smack-dab between the Savannah and the Saluda.

Posted 18 May 2019 - 02:48 PM

Glad to see ya back around, my friend! 

 

Love this, so simple, and I can think of a few "gunky" ponds to try out.  It'll be a first for hoping there aren't fish where I'm headed!  Could you give a little more detail on the adapter though? I'm accident prone to start with and this just seems like something I better have my p's and q's together on.  Do I remember you separating blackworms with a battery before? How do you store the blackworms, in the fridge?

 

Love your daughter's baby sals!  


Matt Knepley
"No thanks, a third of a gopher would merely arouse my appetite..."




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