Scottish Fish Farm Production Survey 2013

The annual production survey of fish farms in Scotland for 2013 was carried out by Marine Scotland Science (MSS). This survey collates annual production data from Scottish fin fish farm sites operated by authorised aquaculture production businesses.


The tables below summarise the results from the 2013 fish farms annual production survey.

Rainbow Trout ( Oncorhynchus mykiss)

2012 2013
Total production (tonnes) 5,670 5,611
Production for the table (tonnes) 5,059 5,001
Production for restocking (tonnes) 611 610
Number of staff employed 107 110
Mean productivity (tonnes/person) 53.0 51.0
Number of ova laid down to hatch (millions) 13.0 9.9
Number of ova imported (millions) 12.7 9.3

In 2013, the production of rainbow trout decreased by 59 tonnes. Employment increased by three staff and mean productivity decreased to 51 tonnes per person. The number of ova laid down to hatch decreased by 3.1 million and the number of ova imported decreased by 3.4 million.

Atlantic salmon ( Salmo salar)


2012 2013
Number of ova produced (millions) 57.5 56.9
Number of ova laid down to hatch (millions) 63.2 66.6
Number of ova exported (millions) 0 0.7
Number of ova imported (millions) 34.0 48.5
Number of smolts produced (millions) 44.3 40.5
Number of smolts put to sea (millions) 41.1 40.9
Number of staff employed 328 285
Mean productivity (000's smolts/person) 135.1 142.0

The production of ova decreased by 0.6 million in 2013 and the number of ova laid down to hatch increased by 3.4 million. A small number of ova were exported and imports of ova increased in 2013. The number of smolts produced decreased by 3.8 million. Data on smolt staffing and productivity in 2013 are shown, however, there are uncertainties with these data due to consolidation within the industry.

Production fish

2012 2013
Total production (tonnes) 162,223 163,234
Production of 0-year fish (tonnes) 301 0
Production of grilse (tonnes) 53,216 47,496
Production of pre-salmon (tonnes) 44,528 58,665
Production of salmon (tonnes) 64,178 57,073
Mean fish weight 0-year (kg) 2.4 -
Mean fish weight grilse (kg) 4.7 4.9
Mean fish weight pre-salmon (kg) 4.4 5.0
Mean fish weight salmon (kg) 4.9 5.1
Number of staff employed 1,059 1,086
Mean productivity tonnes/person 153.2 150.3

Production tonnage increased by 1,011 tonnes with an increase in the mean harvest weight of grilse, pre-salmon and salmon. There were no 0-year fish harvested in 2013. Staff numbers increased by 27 and mean productivity decreased to 150.3 tonnes per person.

Smolt survival (percentage harvested)

Survival (%) Years 0+1 Year 2 Total
2010 input year class 48.9 33.9 82.8
2011 input year class 50.6 26.4 77.0

The smolt survival rate for the 2011 input year class decreased to 77%.

Other Species

including Arctic charr, Salvelinus alpinus; brown/sea trout, Salmo trutta; cod, Gadus morhua; halibut, Hippoglossus hippoglossus and several species of wrasse, Labridae)

2012 2013
Total production (tonnes) 115 102
Number of staff employed (full-time) 25 29
(part-time) 21 21
Number of ova laid down to hatch (millions) 1.9 a 7.7 c
Number of ova imported (millions) 0 b 0 d

Some figures are excluded from this report as providing them would reveal production information from individual companies.

a Excluding wrasse ova laid down to hatch from foreign sources.
b Excluding wrasse ova imported.
c Excluding halibut ova laid down to hatch.
d Excluding halibut ova imported.

In 2013, the production of other species decreased by thirteen tonnes from the 2012 total. Overall, employment increased by four people in 2013. There was a marked increase in the number of ova laid down to hatch although the complete figures for ova cannot be shown without revealing the figures for individual companies.

Number of Confirmed Escape Incidents from Fish Farms Notified to the Scottish Government

Species Number of reported incidents which could have led to an escape of farmed fish Number of reported incidents which did lead to an escape of farmed fish Number of fish escaped
Rainbow trout 0 2 7,442
Atlantic salmon (freshwater stages) 0 2 16,646
Atlantic salmon (seawater stages) 4 4 9,709
Halibut 0 1 6,957


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