Scottish Fish Farm Production Survey 2013

1. RAINBOW TROUT ( Oncorhynchus mykiss)

Production survey information was collected from all 24 companies actively involved in rainbow trout production, farming 46 active sites. This figure represents the entire industry operating in Scotland.

Production

Table 1a: Total production (tonnes) of rainbow trout during 1999-2013 and projected production in 2014

Year	Tonnes	Year	Tonnes
1999	5,834	2007	7,414
2000	5,154	2008	7,670
2001	5,466	2009	6,766
2002	6,659	2010	5,139
2003	7,085	2011	4,619
2004	6,352	2012	5,670
2005	6,989	2013	5,611
2006	7,492	2014	6,836*

Production decreased in 2013 by 59 tonnes, a decrease of 1%.
* Industry estimate based on stocks currently being on-grown.

Table 1b: Production (tonnes) for the table trade during 2003-2013 according to weight category

Year	<450 g	450-900 g	>900 g	Total
	<1 lb	1-2 lbs	>2 lbs	Tonnes
2003	2,531	1,181	2,477	6,189
2004	1,553	1,946	1,917	5,416
2005	2,856	1,203	2,111	6,170
2006	2,182	1,810	2,636	6,628
2007	2,499	1,663	2,407	6,569
2008	2,375	1,950	2,487	6,812
2009	2,232	1,143	2,620	5,995
2010	2,125	727	1,606	4,458
2011	1,421	1,004	1,433	3,858
2012	1,195	1,655	2,209	5,059
2013	1,908	825	2,268	5,001

Production for the table in 2013 was 5,001 tonnes, a decrease of 58 tonnes (1%) on the 2012 total, and accounted for 89.1% of the total rainbow trout production, a similar proportion to that produced in 2012. Increases in the number of fish in the small and large size ranges and a decrease in the number of fish in the medium size range were highlighted.

Table 1c: Production (tonnes) for the restocking trade during 2003-2013 according to weight category

Year	<450 g	450-900 g	>900 g	Total
	<1 lb	1-2 lbs	>2 lbs	Tonnes
2003	63	490	343	896
2004	64	509	363	936
2005	21	390	408	819
2006	36	357	471	864
2007	24	413	408	845
2008	27	351	480	858
2009	32	294	444	770
2010	19	201	461	681
2011	8	419	334	761
2012	22	266	323	611
2013	24	221	365	610

In 2013, production for the restocking of angling waters decreased to 610 tonnes representing a decrease of one tonne (0.2%) on the 2012 total. This accounted for 10.9% of total rainbow trout production in 2013. These figures represent the tonnage of fish supplied to angling waters for restocking purposes; they do not account for the catch taken by anglers. The production of medium sized fish showed a decrease, while this increased for small and large sized fish.

Production by Site

Table 2: Numbers of sites grouped by tonnage produced during 2003-2013

Year	Number of sites per production tonnage				Total number of sites
	<1-25	26-100	101-200	>200
2003	17	9	6	11	43
2004	14	14	5	10	43
2005	18	12	6	11	47
2006	16	15	6	13	50
2007	14	15	3	16	48
2008	8	15	7	14	44
2009	10	11	7	11	39
2010	7	13	9	7	36
2011	9	10	6	8	33
2012	10	10	6	8	34
2013	6	11	5	8	30

Production was reported from 30 of the 46 active sites. The number of producers in the size brackets <1-25 tonnes and 101-200 tonnes decreased in 2013, while those producers in the 26-100 tonne size bracket increased and the >200 tonnes size bracket remained the same. These figures do not include those sites specialising in the production of ova or young fish for on-growing.

Production by Method

Table 3: Grouping of rainbow trout sites by production tonnages, main methods of production in 2013 and comparison with production in 2012

Production method	Production grouping (tonnes) in 2013					Total tonnage and (%) by method		Number of sites
	<10	10-25	26-50	51-100	>100	2012	2013	2012	2013
FW cages	1	0	0	0	5	2,220 (39.2%)	2,424 (43.2%)	6	6
FW ponds and raceways	1	1	3	7	3	1,362 (24.0%)	1,213 (21.6%)	18	15
FW tanks and hatcheries	3	0	0	0	0	12 (<1%)	10 (<1%)	3	3
SW cages	0	0	1	0	5	2,076 (36.6%)	1,964 (35.0%)	7	6
SW tanks	0	0	0	0	0	0	0	0	0
Total	5	1	4	7	13	5,670	5,611	34	30

Freshwater production accounted for 3,647 tonnes (65.0%) and seawater production for the remaining 1,964 tonnes (35.0%). Production from freshwater cages increased whilst there was a decrease in production from freshwater ponds and raceways and seawater cages.

Company and Site Data

Table 4: Number of companies and sites in production during 2000-2013

Year	No. of companies	No. of sites
2000	54	63
2001	50	57
2002	39	57
2003	37	56
2004	38	62
2005	42	70
2006	36	66
2007	38	70
2008	31	66
2009	27	56
2010	25	51
2011	23	48
2012	25	48
2013	24	46

In 2013 the number of companies authorised by the Scottish Government and actively engaged in rainbow trout production was 24. The number of sites registered and in production was 46.

Staffing and Productivity

Table 5: Number of staff employed and productivity per person during 2000-2013

Year	Full-time	Part-time	Total	Productivity (tonnes/person)
2000	121	47	168	30.7
2001	118	41	159	34.4
2002	114	46	160	41.6
2003	107	41	148	47.9
2004	115	37	152	41.8
2005	108	35	143	48.9
2006	112	35	147	51.0
2007	111	32	143	51.8
2008	107	34	141	54.4
2009	111	27	138	49.0
2010	98	31	129	39.8
2011	95	23	118	39.1
2012	79	28	107	53.0
2013	89	21	110	51.0

The overall number of staff employed in 2013 increased by three to 110. The numbers of full-time staff increased by 10 while the number of part-time staff decreased by seven. Productivity, measured as tonnes produced per person, decreased by 3.8% in 2013 with no distinction between full and part-time employees being made for this calculation.

Production by Area

Table 6: Production and staffing by area in 2013

Area	No. of sites	Table production (tonnes)	Restocking production (tonnes)	Mean tonnes per site	Staffing			Productivity (tonnes/person)
					F/T	P/T	Total
North	6	5	36	6.8	2	2	4	10.3
East	14	881	248	80.6	32	6	38	29.7
West	12	3,593	39	302.7	20	7	27	134.5
South	14	522	287	57.8	35	6	41	19.7
All	46	5,001	610	122.0	89	21	110	51.0

Productivity was greatest in the West at 302.7 tonnes per site and 134.5 tonnes per person.

Figure 1: The distribution of active rainbow trout sites in 2013

Type of Ova Laid Down

Table 7: Number (000's) and proportions (%) of eyed ova types laid down to hatch during 2002-2013

Year	All female diploid no. (%)	Triploid no. (%)	Mixed sex diploid no. (%)	Total ova
2002	19,733 (89)	1,822 (8)	570 (3)	22,125
2003	24,692 (94)	1,586 (6)	60 (<1)	26,338
2004	29,272 (90)	3,146 (10)	138 (<1)	32,556
2005	16,773 (83)	1,729 (8)	1,745 (9)	20,247
2006	22,378 (84)	2,804 (10)	1,626 (6)	26,808
2007	23,630 (83)	2,531 (9)	2,140 (8)	28,301
2008	22,978 (88)	2,526 (9)	725 (3)	26,229
2009	15,469 (87)	2,341 (13)	35 (<1)	17,845
2010	13,352 (89)	1,052 (7)	675 (4)	15,079
2011	12,673 (84)	2,254 (15)	215 (1)	15,142
2012	10,967 (85)	2,005 (15)	7 (<1)	12,979
2013	7,857 (80)	1,955 (20)	77 (<1)	9,889

Source of Ova Laid Down

Table 8: Number (000's) and sources of eyed ova laid down to hatch in 2002-2013

Year	Ova produced in Great Britain ( GB)			Imported ova			Total
	Own stock	Other stock	Total	Northern hemisphere	Southern hemisphere	Total
2002	530	200	730	12,385	9,010	21,395	22,125
2003	430	280	710	25,578	50	25,628	26,338
2004	330	320	650	31,906	0	31,906	32,556
2005	281	105	386	16,977	2,884	19,861	20,247
2006	541	2,169	2,710	22,588	1,510	24,098	26,808
2007	936	230	1,166	26,650	485	27,135	28,301
2008	582	487	1,069	25,160	0	25,160	26,229
2009	603	220	823	17,022	0	17,022	17,845
2010	415	50	465	14,614	0	14,614	15,079
2011	215	189	404	14,738	0	14,738	15,142
2012	14	230	244	12,735	0	12,735	12,979
2013	77	537	614	9,275	0	9,275	9,889

The total number of eyed ova laid down to hatch in 2013 was less than that in 2012. The proportion of ova from GB broodstock increased to 6.2% of the total and the rainbow trout industry remained reliant on imported ova. Data on the importation of ova into Scotland are also available from the health certificates and are shown in Table 9a. Any discrepancy between the figures in Tables 8 and 9a is due to data being obtained from two independent sources.

Imports from Official Import Health Certificates

Table 9a: Number (000's) and sources of ova imported into Scotland from outwith GB during 2006-2013

Source	2006	2007	2008	2009	2010	2011	2012	2013
Australia	1,500	0	0	0	0	0	0	0
Denmark	14,525	13,070	5,530	4,070	1,715	5,250	1,950	1,315
Isle of Man	3,480	3,767	775	290	1,400	520	300	800
N. Ireland	2,830	7,721	16,130	10,090	9,247	7,320	8,332	5,125
Norway	500	1,200	1,500	750	200	130	300	175
South Africa	0	485	0	0	0	0	0	0
USA	2,310	890	1,490	2,240	2,340	1,580	1,800	2,350
Totals	25,145	27,133	25,425	17,440	14,902	14,800	12,682	9,765

Table 9b: Seasonal variation in numbers (000's) and sources of ova imported into Scotland from outwith GB during 2013

Month	Denmark	Isle of Man	N. Ireland	Norway	USA
January	0	525	0	0	0
February	300	0	800	0	0
March	150	0	125	0	0
April	375	275	800	175	0
May	200	0	400	0	0
June	0	0	0	0	150
July	0	0	400	0	500
August	0	0	200	0	800
September	0	0	970	0	700
October	0	0	730	0	0
November	235	0	350	0	200
December	55	0	350	0	0
Totals	1,315	800	5,125	175	2,350

Suppliers within the European Union ( EU) accounted for 74.1% of ova imported into Scotland during 2013 with the USA and the Isle of Man accounting for 24.1% and 8.2% respectively. To maintain their ability to regulate production throughout the year and produce a constant supply of fish for their markets, producers have to rely upon supplies of out of season ova.

Table 9c: Number (000's) and sources of fish imported into Scotland from outwith GB during 2006-2013

Source	2006	2007	2008	2009	2010	2011	2012	2013
N. Ireland	<1	18	33	0	<1	72	155	537
Republic of Ireland	0	0	0	0	2	0	0	0

Trade in Fry and Fingerlings

Table 10: Number (000's) of fry and fingerlings traded during 2002-2013

Year	Fry and fingerlings bought			Total number bought	Total number sold
	All female diploid no. (%)	Triploid no. (%)	Mixed sex diploid no. (%)
2002	10,031 (88)	670 (6)	667 (6)	11,368	10,101
2003	17,500 (94)	1,007 (5)	193 (1)	18,700	17,451
2004	18,859 (91)	1,536 (7)	364 (2)	20,759	19,166
2005	14,618 (83)	1,532 (9)	1,480 (8)	17,630	16,919
2006	19,731 (89)	1,675 (7)	790 (4)	22,196	20,460
2007	14,830 (89)	1,140 (7)	675 (4)	16,645	23,631
2008	24,298 (95)	1,082 (4)	118 (0.5)	25,498	31,036
2009	21,113 (94)	1,358 (6)	0	22,471	20,597
2010	15,539 (95)	585 (4)	141 (1)	16,265	14,686
2011	16,288 (88.5)	1,970 (10.7)	138 (0.8)	18,396	16,612
2012	12,543 (91)	1,226 (9)	0	13,769	12,088
2013	6,734 (84)	1,239 (16)	0	7,973	6,749

The established trade between hatcheries and on-growing farms continued in 2013. Some companies specialised in the production of fry and fingerlings. The total number of fry and fingerlings bought and sold decreased by 42.1% and 44.2% respectively. The disparity between supply and demand is due to trade with England and Wales.

Use of Vaccines

Table 11: Number of sites rearing fish vaccinated against enteric redmouth disease ( ERM) and number of fish vaccinated (millions) during 2002-2013

Year	2002	2003	2004	2005	2006	2007	2008	2009	2010	2011	2012	2013
No. of sites	34	38	42	37	31	28	28	31	27	26	24	19
No. of fish	30.6	32.9	30.6	30.0	36.4	41.4	29.1	27.5	20.0	20.3	20.4	9.9

Vaccines continued to be widely used as a preventative treatment against enteric redmouth disease ( ERM), a potentially serious bacterial infection, caused by Yersinia ruckeri. Vaccination is generally carried out as a bath treatment at the fingerling stage, although some vaccines are administered by intra-peritoneal injection. A total of 9.9 million fish were vaccinated on 19 sites.

Organic Production

None of the 46 active rainbow trout sites in 2013 had organic certification.

Escapes

There were two incidents involving the loss of a total of 7,442 fish from rainbow trout sites in 2013.