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

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Summary for Norway (2017)
TotalProduction (t)Percent of total
fish production %		Estimated Numbers
(millions)
All species with an EMW
(Estimated mean weight)		      1,305,370100 160 - 399
All species without an EMW            6650Not estimated
Total fish production      1,306,035100
out of total aquaculture production      1,308,634

   

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Data for Norway (2017)
SpeciesProduction (t)1Estimated
mean weight2,5
(EMW) g		EMW id2Estimated
Numbers
(millions)3
Atlantic salmon      1,236,3533,614-8,43421 147 - 342
Rainbow trout         66,9021,200-5,000155 13 - 56
Atlantic halibut          1,6233,000-5,00020 <1 - 1
Atlantic cod            4922,000-5,00019 <1
Arctic char            341 Not estimated4
Finfishes nei            227 Not estimated4
Sea trout             97 Not estimated4
 
Totals by estimate type:
Production (t)Percent of
total fish
production %		Estimated Numbers
(millions)
   Single species with an EMW       1,305,370100 160 - 399
Totals for species with an EMW      1,305,370100 160 - 399
Totals for species without EMW            6650 Not estimated4
Total fish production      1,306,035100
out of total aquaculture production      1,308,634

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


Notes
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.