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Estimated numbers of individuals in aquaculture production (FAO) of fish species (2017)

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Summary for Poland (2017)
TotalProduction (t)Percent of total
fish production %
Estimated Numbers
All species with an EMW
(Estimated mean weight)
         34,19788 20 - 109
All species without an EMW          4,60212Not estimated
Total fish production         38,799100
out of total aquaculture production         38,800


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Data for Poland (2017)
SpeciesProduction (t)1Estimated
mean weight2,5
(EMW) g
EMW id2Estimated
Common carp         18,325500-2,50057 7 - 37
Cyprinids nei            335 Not estimated4
Freshwater fishes nei          3,271 Not estimated4
Grass carp(=White amur)            576500-2,50087 <1 - 1
Nile tilapia            100250-800129 <1
North African catfish            140500-1,500132 <1
Northern pike            150 Not estimated4
Rainbow trout         14,481210-1,200155 12 - 69
Silver carp            575300-1,500182 <1 - 2
Sturgeons nei            640 Not estimated4
Tench            130 Not estimated4
Wels(=Som) catfish             76 Not estimated4
Totals by estimate type:
Production (t)Percent of
total fish
production %
Estimated Numbers
   Single species with an EMW          34,19788 20 - 109
Totals for species with an EMW         34,19788 20 - 109
Totals for species without EMW          4,60212 Not estimated4
Total fish production         38,799100
out of total aquaculture production         38,800

Estimated by A Mood and P Brooke, Sep 2019.   Updated Nov 2019 for Rainbow trout, see note 5 below.

1. Source of production tonnage: FAO FishStat "Aquaculture Production (Quantities and values) 1950-2017 (Release date: 25th March 2019)".
2. Source of estimated mean weights (EMWs) : as for our earlier estimate, see Estimating the Number of Farmed Fish Killed in Global Aquaculture Each Year.
3. The estimated numbers are calculated as the production tonnage divided by estimated mean weight (EMW) where a mean weight has been estimated for the species.
4. The fish numbers for species without an estimated mean weight (EMW) have not been estimated for each individual species or country.
5. For rainbow trout, a weighted estimated mean weight has been used based on the proporation of small rainbow trout (< 1200g) and large rainbow trout (> 1200g) produced in the country, if available. See FEAP data.
(The estimated mean weight (EMW) for rainbow trout is 210-5000g and the EMWs for small and large rainbow trout are therefore respectively 210-1200g and 1200-5000g.)
Global estimated numbers for rainbow trout based on these weighted estimated mean weights total 268-3072 million individuals as compared to 162-3865 million based on the (unweighted) estimated mean weight of 210-5000g.