PILOT BASINS - Rivers Guadalquivir & Guadiaro...River Guadalquivir. Obstacles to migration River...

PILOT BASINS - RiversGuadalquivir & Guadiaro

Carlos Fernández-DelgadoUniversity of Córdoba

EMUs in Andalucía

Atlantic EMUMediterranean Emu

The river basin

River length – 668,3 kmRiver basin area - 57527 km²41 main tributaries

Estuarine length• 60 km (Summer)• 0-20 km (Winter)

River Guadalquivir

Obstacles to migrationRiver Guadalquivir

1

Obstacles

Alcalá del Río dam(Main River bed)

1

Alcalá del Río dam

Agrio dam

2

El Gergal dam

3

El Esparragal dam

4

Torre del águila dam

5

Obstacles to migrationRiver Guadalquivir

Accessible area 26% of theoriginal river basin

The eel fisheryRiver Guadalquivir

The eel fisheryRiver Guadalquivir

Other pressures on the eelRiver Guadalquivir

Silver females Residents Silver males Premigrants

Recruitment

(Estuary / glass eels) Jan/2013-May/2015

Length, weight, stages (n=16176)

Abundance, salinity, Temp, winds, etc.

No monitoring at these moments: lack of money

June 1997-December 2006

Silver males (Md)

200 400 600 800 1000

015

0

n = 512

Stage FV

200 400 600 800 1000

015

0

n = 739

Stage FIV

200 400 600 800 1000

06 n = 17

Stage FIII

200 400 600 800 1000

015

0

n = 1028

Stage FII

200 400 600 800 1000

030

0

n = 1693

Stage FI

Total length (mm)Num

bero

fspe

cim

ens

200 400 600 800 1000

030

0

n = 1524

Oct Nov Dec Jan Feb Mar Apr May

Md FV FIV

Num

bero

fspe

cim

ens(

%)

010

2030

40 n = 1342

600

650

700

750

800

850

Mea

nm

onth

lyle

ngth

ofda

ylig

ht(m

inut

es)

The river basinRiver Guadiaro

River length – 82 kmRiver basin area - 1505 km²Estuarine length

• 4 km (Summer)• 0 km (Winter)

Without any relevant obstacle

Age, growth, condition, sex ratio, silvering process,Seasonal movements (Mark-recapture)Biomass & productivity

www.sudoang.eu

Project co-financed by the INTERREG SUDOE Programmethrough the European Regional Development Fund (ERDF)