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

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Summary for Italy (2017)
TotalProduction (t)Percent of total
fish production %
Estimated Numbers
All species with an EMW
(Estimated mean weight)
         51,25390 58 - 172
All species without an EMW          5,38110Not estimated
Total fish production         56,634100
out of total aquaculture production        157,000


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Data for Italy (2017)
SpeciesProduction (t)1Estimated
mean weight2,5
(EMW) g
EMW id2Estimated
Arctic char             20 Not estimated4
Black bullhead            300 Not estimated4
Brook trout            400 Not estimated4
Channel catfish            300340-68045 <1 - 1
Common carp            542500-2,50057 <1 - 1
Common sole              5 Not estimated4
European eel          1,250 Not estimated4
European perch              2 Not estimated4
European seabass          6,800400-50072 14 - 17
Flathead grey mullet            700500-1,50076 <1 - 1
Freshwater fishes nei            600 Not estimated4
Gilthead seabream          7,600300-40081 19 - 25
Largemouth black bass             60680110<1
Marine fishes nei             10 Not estimated4
Meagre            100 Not estimated4
Mullets nei            100 Not estimated4
Porgies, seabreams nei             15 Not estimated4
Rainbow trout         35,000278-1,462155 24 - 126
Sea trout          1,000 Not estimated4
Sharpsnout seabream             15 Not estimated4
Shi drum            150 Not estimated4
Striped bass, hybrid            250816205<1
Sturgeons nei          1,000 Not estimated4
Tench             10 Not estimated4
Tilapias nei              1250-800215 <1
Trouts nei            400 Not estimated4
White seabream              4 Not estimated4
Totals by estimate type:
Production (t)Percent of
total fish
production %
Estimated Numbers
   Single species with an EMW          51,25290 58 - 172
   Multi species with an EMW               10<1
Totals for species with an EMW         51,25390 58 - 172
Totals for species without EMW          5,38110 Not estimated4
Total fish production         56,634100
out of total aquaculture production        157,000

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.