Geoscience Reference
In-Depth Information
Annex 3
Occupied, reference and vulnerable river length used to evaluate the distribution range and vulnerability of
Atlantic salmon in Cantabrian rivers. The percentage of lost river and vulnerable length is also shown.
Occupied
length (km)
Reference
length (km)
Vulnerable
length (km)
Percentage
Vulnerable (%)
River
Lost length (%)
Vulnerability
Ag uera
0
27.7
Extinct
Not evaluated
As on
54.8
65.6
16.4
50.3
91.8
Vulnerable
Campiazo
0
19.5
Extinct
Not evaluated
Deva
46.5
75.9
38.8
46.5
99.9
Vulnerable
Escudo
0
20.5
Extinct
Not evaluated
Gandarilla
0
4.7
Extinct
Not evaluated
Miera
24.7
43.1
42.8
22.5
91.3
Vulnerable
Mio no
0
5.4
Extinct
Not evaluated
Nansa
16.0
58.8
72.7
16.0
100.0
Vulnerable
Pas-Pisue na
78.9
104.4
24.4
78.1
98.9
Vulnerable
Sabiote
0
4.7
Extinct
Not evaluated
Saja-Besaya
15.5
126.3
87.8
15.5
100.0
Vulnerable
Total
236.4
556.6
57.5
Annex 4
Atlantic salmon population size and reference size, one-sea-winter (1SW) and multi-sea-winter (MSW) adult
ratio and adult female ratio estimated from angling captures in the year 2008 and density of fry in spawning gravels
estimated from electro-fished sites between July-September 2010 in Cantabrian rivers.
Variables
As on
Miera
Pas-Pisue na
Nansa
Deva
Population size (captures)
44.8
0.4
74.2
18.8
49.4
*
3G population size (captures)
112.6
0
192.6
59
20.4
1SW / total adults
0.17
0.00
0.09
0.08
0.03
Female / male
0.00
0.00
0.64
0.50
0.50
Density 0
+
(individuals m
−2
)
0.005
0.016
0.025
0.012
0.023
Diagnosis structure and composition
Inadequate
Inadequate
Inadequate
Inadequate
Inadequate
*
3G: estimate of population size three generations ago (benchmark level)
