How to calculate fish biomass

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Video description
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How to calculate fish biomass
The fish biomass correspond to the total weight of fish present in a fish tank.
Why calculation the fish biomass
Knowing your Fish tank total biomass is important as this value will be necessary for the management of your Aquaponics setup. In this article we will see 2 points that require the fish biomass.
1. Feeding following the feeding tables
Some species of fish raised in aquaculture have been raised for generations and lots of studies have been done on those fish. The fish supplier are able to supply “feeding tables” which are data giving you the quantity of fish food to give to your fish depending on the species, the water temperature and the size of the fish…( Read more in MelbourneAquaponics.com.au)
2. Remaining under the maximum limits of the system
Every Aquaponics system has a maximum capacity to transform the fish poo into plant fertilizer. This maximum limit is determined by the quantity and quality of the bacteria present in the aquaponics setup. In a classic growbed aquaponics system this quantity of bacteria is present on the surface of the media into the growbed. If you build your aquaponics setup following the advices provided into our free 6 STEP Aquaponics guide you will put a flood and drain system into your growbed. This will ensure the environment is 100% aerobic which will allow the probiotic to grow and be efficient into the transformation of ammonia into nitrate. The total quantity of bacteria will therefore be dependant of the growbed volume. The larger the growbed and the more media volume you will have which mean more room for the bacteria to grow…( Read more in MelbourneAquaponics.com.au)
Now that we understand the utility to know the total fish biomass of an aquaponics system let’s see how to calculate it.

Fish Biomass calculation
So here is the simple calculation, the fish biomass is equal to the total weight of fish in the fish tank which is equal to the number of fish multiplied by the average weight of the fish (fish size). The question is “how do you get those 2 numbers which are the number of fish and the average weight…”
Number of fish: In aquaponics like in aquaculture we generally know how many fish we stock into the fish tank from the day we buy them. Indeed we generally buy fish fingerlings by 50 - 100 or much more so we know exactly how many fish we start with. During the raising process you will probably lose a few fish and I recommend to keep track of the number of dead fish in a little Aquaponics notebook. In this case you can withdraw the number of dead fish to the number of fish initially bought and obtain the current number of fish in your fish tank.
Average fish weight: The average fish weight is continually evolving and (generally and hopefully increasing excepted when you go on holiday and in winter if you live in a cold country). You should keep track of this value and especially when the fish get close to the plate size and the biomass increases. In order to do an average weight simply prepare a bucket with water and weight it thanks to a scale. Fish some fish from your fish tank (10 to 30) and put them into the water bucket. Now weight the fish bucket. Once you get this number withdraw the weight of the water bucket and you obtain the weight of your fish. Divide this number by the number of fish into your bucket and you obtain the average fish weight. Easy .

Now you have your number of fish and your average weight so you multiply those 2 numbers and you obtain the fish biomass!
Read more in MelbourneAquaponics.com.au
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How to calculate fish biomass:    • How to calculate fish biomass