Comment

Comment by mary proctor on July 16, 2012 at 4:24pm

we just found out about K1media.  We would like to have feed back on how to utilize it.  We have a small business selling Tilapia fries and fingerlings.  also aquaponic systems.  We have 4 IBC totes with lots of Tilapia in them.  wondering how to incorporate the K1media in one tank to take care of all 4 tanks.  We currently have biofilters on each tank. We have many aquarium  tanks with regular filters in them.  Looking forward to discussions.  Mary & Randy Serenity Springs Aquaponics.

Comment by marty lininger on May 11, 2012 at 8:49am

I want to estimate the size of duckweed bed that a specified fish population can support.  Any feedback I can get on my assumptions validity would be greatly appreciated!  Perhaps there is a logic error in my steps to calculate the size, please let me know!

My final calculation below seems to be way too much.  I do not know where I am erring.

Assumptions:

fish incorporate 30% of protein in feed, the other 70% is converted to ammonia  (1)

can get 95 gram of ammonia from 1kg of protein fed    (1)

1 gram of ammonia will feed 1 SM of duckweed  (2)          

duckweed can double in 4 days or less

constant population mass 1000kg of tilapia,       FCR of 1.5

consumes 1500kg of 30% protein feed in 1 year, consumes 450kg protein

 450kg protein x 95g ammonia/KG protein  = 42,750 g ammonia

which can support 42,750 SM growth of duckweed

harvesting half the crop every 4 days = 365/4 = 90 harvests

42,750 SM / 90 = 475 SM growing area per 1000kg tilapia fish

 

Other:

1SM of optimal density duckweed weighs  0.1 – 1.2 kg (0.65 avg) wet and is 93% water (3)

1 SM of optimal density avg 0.65 kg wet duckweed weighs 45 grams dry

1 SM naturally occurring duckweed in Orlando, FL dried weighs 100g  (4)

 

ref;

(1)    http://www.fao.org/docrep/X5744E/x5744e0e.html

(2)    Kobus Jooste post

(3)    Various sources

(4)     Own observation -but was it optimal density?

Comment by Mörður Gunnarsson Ottesen on January 6, 2012 at 6:48pm

Is Matala mat food grade safe?

What would be the cheapest way to buy it (in general, not thinking locally)?

These are matala mats:

http://pondsolutions.com/Pond_Supplies/Pond-Supplies-Pond-Filters-F...