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Solutions to the SFCC scale reading quiz available for SFCC members at www.sfcc.co.uk
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Q 1.1: How many sea winters are there on this scale?
Image from: 1931 Salmon of the R Dee (Kirkcudbright), plate I
R. Dee 18th July 1928
R. Dee 18th July 1928
Sea winters on this scale
Image from: 1931 Salmon of the R Dee (Kirkcudbright), plate I
1 sea winter
July 1995Q 2.1: How many sea winters are there on this scale?
July 1995
Sea winters on this scale
July 199555lbs, Namsen Fjord, Norway
1 sea winter
2 sea winter
3 sea winter
4 sea winter
R. Add 15th Aug 1913
Q 3.1: How many sea winters are there on this scale?
Image from: 1914 Plate III fig 2
R. Add 15th Aug 1913
Sea winters on this scale
Image from: 1914 Plate III fig 2
1 sea winter
2 sea winter
3 sea winter as spawning mark
Q 1.1: Where is / are the sea-winters on this scale?Q 1.2: Is the growth at the edge open or closed?
A
B
C
R. Tweed 29.07.199860cms, 4lbs
R. Tweed 29.07.199860cms, 4lbs
Reading : x.1+open
1st sea summer
2nd sea summer
Open growth at edge
1st sea winter
R. Tweed16.11.199810lbs
Q 1.1: Where is / are the sea-winters on this scale?Q 1.2: Is the growth at the edge open or closed?
A
B
C
1st sea summer
2nd sea summer
Closing growth at edge
Reading : x.1+closing
1st sea winter
R. Tweed16.11.199810lbs
R Tweed02.05.199486cm, 13 lbs
Q 7.1: Where is / are the sea-winters before the spawning mark?Q 7.2: Is the growth at the edge of the scale open or closed?
A
B
C
Spaw
ning
mar
k
R. Tweed02.05.199486cm, 13 lbs
Reading: x.1.sm.13 sea summer
1st sea winter
Spawning mark (sm)
3rd sea winter
1 sea summer
Note: the spawning mark represents the 2nd sea winter
2 sea summer
R. Add, Argyll20.02.1913Kelt, 10lbs
Q 8.1: How many spawning marks are there on this scale?Q 8.2: How many river winters are there on this scale?
Reading: 2.1.2sm.1or
2.1.sm.sm.1*
1 sea summer
2 sea summer
3 sea summer
R. Add, Argyll20.02.1913Kelt, 10lbs 4 sea summer
2 sm
1 sm
1 sea winter1st river winter
2nd river winter
* As this scale was taken after the 1st of January, the final open &
closed growth bands make a full year rather than being .+closing
4 sea winterCould become 3rd sm
20.02.1913Kelt, 10lbs
This fish was caught the year before as well and scales from both captures are shown here:
24.02.1912Kelt, 8lbs
Q 9.1: Where is the old edge of the 1912 scale on the 1913 scale?Q 9.2: How many river winters are there on the 1913 scale?
A
B
C
R. Add, Argyll
20.02.1913Kelt, 10lbs
24.02.1912Kelt, 8lbs
1st Sea-winter
1st spawning mark
Old edge becomes 2nd spawning mark
1 river winter
2 river winter
R. Tweed16.02.199992cm 15lbs
Q 10.1: How many sea-winters are there on this scale ?Q 10.2: How many river winters are there on this scale
2.3
1 sea winter
2 sea winter
2 river winter
1 river winter
R. Tweed16.02.199992cm 15lbs
3 sea winter
18.10.9163cm, 5lbs,
Q 11.1: Where is the transition from river to sea on this scale ?Q 11.2: Is the growth at the edge open or closed ?
ABC
R Tweed18.10.9163cm, 5lbs,
3.1+o
1st sea winter
Transition
Open growth around most of edge
R. Tweed27.03.199512lbs 80cms
Q 12.1: What is the reading of the marine phase of this scale?
x.1.sm.1
1st sea winter
Spawning mark
1 summer & 1 winter after the spawning
mark = 1 year
R. Tweed27.03.199512lbs 80cms
R. Tweed19.11.200314lbs
Q 13.1: How many sea winters are there on this scale ?Q 13.2: Is the growth at the edge open or closed ?
R. Tweed19.11.200314lbs
1st sea winter
2nd sea winter
Open growth at edge
2.2+o
A: Grilse or Salmon?
16.02.199910.11.1998
16.11.1998
B: Grilse or Salmon?
D: Grilse or Salmon?C: Grilse or Salmon?
29.07.98
A: 2.2 Salmon
16.02.199992cm 15lbs
16.11.199810lbs
29.07.9860cm 4lbs
B: 1.1+cl Grilse
C: 2.1+cl Grilse D: 1.1+o Grilse
10.11.19988lbs
In the Autumn, the closing growth at the edge of a scale gives a Grilse a similar pattern to that of a 2SW fish
Q 15.1: How many winters is / are there in this freshwater phase?Q 15.2: Is there run out after the final river winter?
1 river winter
2 river winter 0 run-out
Q 16.1: How many winters is / are there in this freshwater phase?
1 River winter
2 River winter
3 River winter
Q 17.1: How many winters is / are there in this freshwater phase?
1 River winter
2 River winter
Q 19.1: How many winters are there in this freshwater phase?
Image from: movements in the sea Fig 1 (note: original reading was incorrect)
Image from: movements in the sea Fig 1 (note: original reading was incorrect)
1 River winter
2 River winter
3 River winter
