After we've build our system, we should choose certain fish species that are better for our aquaponics fish enviroment. When choosing the proper fish species for your system you should consider the following aspects:
- available quantity of fingerling and fry;
- local climatic conditions;
- local regulation - some fish species are not allowed to be grown;
- fish for consuming or for selling;
- fish weight.
After you have made your choice, you should try eating a fish from every chosen species. Don't spend months and months trying to grow a fish that is untasteful.
Check with your local Department of Agriculture, Fisheries and Forestry about the fish you are allowed to grow, or you can do a simple google search also.
Quantity is another aspect to consider when choosing the right aquaponics fish. Why do you want to grow fish: you want to make a living out of it or just to treat your family with a fish meal, a couple of times a week? Fish hatcheries usually sell fingerlings in big quantities, normally 100-200 fingerlings/sale.
Also when consuming the fish, around half of the fish weight will be lost in inedible bits (head, guts, fins or bones) so a good serve for an adult will be around 500 grams of fish. A family consisted of two adults and one children will consume in one dinner around two 500 grams fish. So, in a year your family will eat around 200 half-a-kilo fishes, more or less, if consumed twice a week.
When deciding the quantity of the fish to grow, you need to calculate using a standard that involves kilograms of fish per 1000 litres of water.
Fish weight will depend on the following factors:
- tank size;
- fish size;
- fish species;
- system capability to dissolve oxigen levels;
- system bio-filtration;
- system nitrate-removal ratio
Manage these aspects in a proper way and I will guarantee you will get an excess of 50kg of fish, every year, in a 1000 litres fish tank.
In conclusion, don't make the mistake of skipping this important step for your future aquaponics system. You can thank me later!
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