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 Post subject: Fish per gallon
PostPosted: Wed Oct 21, 2009 5:42 am 
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Joined: Sat Mar 28, 2009 7:13 am
Posts: 137
Location: Philippines
what is the normal ratio of fish per gallon of water in the fish tank.

I heard 1 inch of fish for every gallon.

I also heard 1/2 lb of fish per gallon.

So actually how many fish per gallon.

I have 30 gallons of water at any given time in my fish tank so how many fish would be ideal.

I am growing lettuce, tomatoes and sweet peas.


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 Post subject: Re: Fish per gallon
PostPosted: Wed Oct 21, 2009 6:32 pm 
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Joined: Mon Feb 04, 2008 10:41 am
Posts: 73
Location: Smithville,Ohio
Hi Aquaarche,

The max for a system is about 1ld / gal., after that tank oxygen is added (this is a "big business setup). For me, I try to stay at 1/2 ld per gallon. When you get higher a lot more things can go wrong fast.
That said if you have 30 gal. you could have 15 pounds of adult fish or a lot of fingerlings.

Ironfish


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 Post subject: Re: Fish per gallon
PostPosted: Wed Oct 21, 2009 8:18 pm 
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Location: Philippines
I currently have only 10 three inch gold fish. I'll get some more then they in no way equal that amount in lbs


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 Post subject: Re: Fish per gallon
PostPosted: Wed Oct 21, 2009 11:04 pm 
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Joined: Fri Sep 12, 2008 2:18 pm
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Location: Malden Bridge, NY
There is no number. You need to understand your bio filtration system to know. Fish grow and until you have a mature system where the average size is constant (by volume) you can't know.

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 Post subject: Re: Fish per gallon
PostPosted: Thu Oct 29, 2009 9:08 pm 
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Location: Montana, USA
aquaarche, one of your countrymen is here, Joel is his handle ;)

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 Post subject: Re: Fish per gallon
PostPosted: Mon Jan 25, 2010 1:44 am 
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Joined: Tue Jan 12, 2010 1:57 am
Posts: 11
Location: Okanogan, WA
Hi, I am new to aquaponics, designing a 500 gallon tank system to start this spring. I figured I could raise 100 tilapia fingerlings in it.

I am getting a wide range of figures tho. According to Edgar Sanchez http://tilapiafarmingathome.com/default.aspx

"My rule of thumb is to allow for a carrying capacity of 2 pounds of biomass (Tilapia) per cubic foot of water.

Lets picture a 500 gallon kiddie pool. It has a volume of 66.85 cubic feet. At a density of 2 pounds per cubic foot we could have in this pool 66 two pound Tilapia, OR 132 one pound Tilapia, OR 264 half pound Tilapia, etc."

He is not doing aquaponics, straight aquaculture, tho. Also I have heard opinions of 1:1 ratio for cubic foot of bed to fish tank.

Best Wishes,
Tom Cloud
Filaree Farm
www.filareefarm.com

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 Post subject: Re: Fish per gallon
PostPosted: Mon Jan 25, 2010 7:17 am 
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I'd stay well clear of Mr. Sanchez. In a mature system with good filtration, one pound per gallon is possible, but has no margin. Go one pound per 2 gallons and be sure to have several bubblers in the tank. Particulate removal and air are the key. You can judge your system by the water quality.

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 Post subject: Re: Fish per gallon
PostPosted: Fri Jul 23, 2010 1:39 am 
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Location: San Jose, CA/Reno, NV
7.5gals per cu ft
are you talking about totally closed systems? you rely on the plants obsorbtion of contaminants from the water to maintain the water quality?


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 Post subject: Re: Fish per gallon
PostPosted: Fri Jul 23, 2010 4:19 pm 
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Who is Mr. Sanchez and why should I stay clear of him?


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 Post subject: Re: Fish per gallon
PostPosted: Mon Jul 26, 2010 9:42 am 
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Joined: Fri Jun 11, 2010 9:16 am
Posts: 1073
Location: Fairport Harbor, Ohio
a good rule of thumb in AP is 25lb grown out fish for every 100 gallons of grow media (the filtration) on a mature system
higher densities can be achieved by adding "manual" filtration and air


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