ronald campbell - deconstructing tweed sea trout with scale reading
TRANSCRIPT
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Deconstructing Tweed Sea-trout
by scale reading
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Length frequencies of angling samples of Tweed Sea-trout
FIRST TIME SPAWNERS
REPEAT SPAWNERS
UNIMODAL
BIMODAL
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1) Caught on the R. Till
2) Caught on the Tweed
upstream of the R. Till
The common sizes of Sea-trout caught on the Tweed are
the uncommon ones on the Till. Why?
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TILL: Sea-trout sizes and ages (first time spawners only)
TILL: Small (40-50 cms)
1 Sea-winter early
summer (April & May)
Sea-troutTILL: Larger (55cms+)
2 Sea-winter Spring Sea-
trout. The summer fish that
follow on are much the same
size
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UPPER TWEED FISH: Almost all 1Sea-
winter Summer and Autumn caught fish –but
larger than the Till’s because return July to
November rather than in April and May
UPPER TWEED :
Sea-trout sizes and ages
(first time spawners only)
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MIDDLE TWEED FISH: Almost all 1Sea-
winter Summer fish –but, again, larger than
the Till’s because return July to September
rather than April and May
MIDDLE TWEED :
Sea-trout sizes and ages
(first time spawners only)
More small fish than for the Upper Tweed
These differences between
Upper and Middle Tweed
may well be due to the latter
catching fish from the R.
Ettrick which turn in to that
tributary and do not go on to
the upper river.
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SCALE EROSION: often overlooked as data
Catching fresh
Catching stale
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TILL: The source of the smaller Sea-trout
TILL: Small (40-50 cms)
1 Sea-winter early
summer Sea-trout
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The Whitling of the Till
“... Is the whitling taken in any streams in this part of the country except the Till?
.....Not in Northumberland, that I am aware of, but it is caught in the Whitadder...
(Oliver, S., 1834 : Scenes and Recollections of Fly-fishing in Northumberland)
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The
College
Burn
THE COLLEGE BURN: Whitling Home Ground
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Bowmont Water
River Till
Hethpool Linns Not passable by Salmon
TWEED
The Cheviot
The College Burn
THE COLLEGE BURN: Whitling Home Ground
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Their different behaviour means the opportunity to study them in their home area as a
biological unit
Only around
The Cheviot
are adult Sea-
trout electric-
fished in small
hill burns from
June onwards
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20th June 1997:
Right up in the hills, but still silvery
By August & September, completely brown
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“The herds have a curious way of poaching here, as well as in the College and other
small burns about the neighbourhood.
They go with a heavy mallet, and having driven the trout under the large stones they
strike the stone a smart blow. The jar somehow stuns the trout and they are easily picked
up.
This is said to be a very destructive method of poaching, but I have never seen it in
operation.”
(Francis, F., 1874 : By Lake and River: An Angler’s Rambles in the North of England and Scotland)
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Their very tight size-range is obvious, the only outliers being fish of 280-300mm that are Blacktail
(=Finnock) spawners, fish that return to fresh water in the same year that they smolted
79.7% of them are between 380 and 460mm (15” to 18”)
50% of them are from 400 to 440mm (15½” to 17¼”) – half
the population within 40mm (1½”) of each other in size.
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I was out yesterday morning below Ford, and out of the seven that I caught, there
were only two that were less than fourteen inches (360mm), and each of these
measured a foot (300mm) ”
(Oliver, S., 1834 : Scenes and Recollections of Fly-fishing in Northumberland)
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There is no doubt that some Whitling spawn as Blacktails: not only were a few
found during the sampling work (photo), scales read from “normal” fish showed
that they had spawned during their first post-smolt Winter, instead of staying in the
sea like the majority (the “spawning mark” is indicated by the red arrow – on
“normal” fish this is where the First Sea-winter Band is found)
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Only 9% return to spawn for a second time (Orange)
1.7% for a third time (Green)
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TABLE A: COLLEGE BURN WHITLING: Population Characteristics
Smolt ages S1 S2 S3 S4
0 77.7% 21.7% 0.5%
Winters at sea before first return 0SW* 1SW 2SW 3SW
3.0% 97.0% 0 0
Repeat Adult Spawnings (1) 1sm 2sm 3sm 4sm
9.3% 1.7% * *
* Fish that return to the river in the same year that they smolted, "Blacktails"
(1) Fish that return to spawn for a second or third time
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TABLE A: COLLEGE BURN WHITLING: Population Characteristics
Total ages 3yrs 4yrs 5yrs 6yrs
71.6% 23.3% 5.1% 0
Life histories 2.1+ 3.1+ 2.1+sm+ Other
69.9% 18.2% 5.1% 6.8%
Size Range <349mm 350-99 400-49 450-99 >500mm
0.62% 20.00% 59.38% 17.54% 2.46%
Sex ratio Male Female
29.15% 70.85%
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The origins of Sea-trout caught in Tweed river (Paxton) and estuary (Gardo)
nets
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Tillmouth, R.
Tweed
16lb Sea-trout,
18th June 2007
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Tillmouth, R.
Tweed
16lb Sea-trout,
18th June 2007
Upper Tweed 1993-11-11
20lbs 6 oz
Date of Capture lbs oz Age Date of Capture lbs oz Age
1963.07.06 15 8 2.3+ 1963.07.17 14 0 2.2+
1963.07.08 10 4 2.2+ 1963.07.17 14 0 2.3+
1963.07.08 12 0 3.2+ 1963.07.26 16 10 2.2+
1963.07.08 13 0 3.2+ 1963.07.27 15 8 2.3+
1963.07.08 17 0 2.2+ 1963.08.05 17 3 2.2+
1963.07.16 21 0 2.2+ 1963.08.28 16 0 2.2+
1963.07.16 23 8 2.2+ 1963.09.06 18 0 2.2+
1963.07.17 12 0 2.2+
I.J.R. Hynd, The Salmon & Trout Magazine, Sept. 1964
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