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EEL STATUS AND KNOWLEDGE IN THE GIRONDE - … · eel status and knowledge in the gironde –...
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EEL STATUS AND KNOWLEDGE IN THE GIRONDE – GARONNE – DORDOGNE AREA : EXPLOITATION, RESSOURCE and ENVIRONMENT MI.GA.DO. – AADPPEDG In collaboration with EPIDOR
Transcript of EEL STATUS AND KNOWLEDGE IN THE GIRONDE - … · eel status and knowledge in the gironde –...
EEL STATUS AND KNOWLEDGE IN THE GIRONDE – GARONNE – DORDOGNE
AREA : EXPLOITATION, RESSOURCE andENVIRONMENT
MI.GA.DO. – AADPPEDGIn collaboration with EPIDOR
AREA LOCATION
BergeracBordeaux
Agen
Toulouse
Dordogne
Garonne
Gironde
BergeracBordeaux
Agen
Toulouse
Dordogne
Garonne
Gironde
AREA CHARACTERISTICS
Area surface: 80.000 km2
Main tributaries : 3.414 km6 "régions"17 "départements"
AREA CHARACTERISTICS
Length : 73 km
Max. width: 13 km
Surface : 625 km2
Mean annual discharge: 1.000m3/s
Gironde
AREA CHARACTERISTICSDordogne andmain tributaries
Area surface : 24.000 km2
Main annual discharge : 330 m3/s
Main tributaries : 1.491 km
AREA CHARACTERISTICSGaronne andmain tributaries
Area surface : 56.000 km2
Main annual discharge : 631 m3/s
Main tributaries : 1850 km
Gironde
Garonne
Dordogne
ENVIRONMENTAL CONSTRAINTS
Nuclear plant
Industrial area
Port area
Bordeaux
Toulouse
Bergerac
Agen
Bordeaux : 740.000 hab.Toulouse : 740.000 hab.Agen : 70.000 hab. Périgueux : 45.000 hab.Bergerac : 26.000 hab.
Périgueux
Agricole area
ENVIRONMENTAL CONSTRAINTS
Comité de Bassin Adour Garonne. 2004. enjeux pour l’eau, questions pour tous. Directive cadre sur l’eau. Consultation des partenaires institutionnels
Land use
ENVIRONMENTAL CONSTRAINTS
Comité de Bassin Adour Garonne. 2004. enjeux pour l’eau, questions pour tous. Directive cadre sur l’eau. Consultation des partenaires institutionnels
Main evacuation of no connected collectivities and industries
ENVIRONMENTAL CONSTRAINTS
Comité de Bassin Adour Garonne. 2004. enjeux pour l’eau, questions pour tous. Directive cadre sur l’eau. Consultation des partenaires institutionnels
Main area of low water mark consummation
ENVIRONMENTAL CONSTRAINTS
Comité de Bassin Adour Garonne. 2004. enjeux pour l’eau, questions pour tous. Directive cadre sur l’eau. Consultation des partenaires institutionnels
Excess of nitrogen coming from agriculture
ENVIRONMENTAL CONSTRAINTS
Comité de Bassin Adour Garonne. 2004. enjeux pour l’eau, questions pour tous. Directive cadre sur l’eau. Consultation des partenaires institutionnels
Main area with risk of agricultural pesticide contamination
ENVIRONMENTAL CONSTRAINTS
Main downstreamobstacle
Insurmontable dams
Difficult access
Colonized area
Non colonizedarea
Dordogne:38% colonized potentialarea (573 km)Garonne:40% colonized potentialarea (747 km)Global area:40% colonized potentialarea (1.393 km)
Tributaries to study
ENVIRONMENTAL CONSTRAINTS
Main downstreamobstacle
Insurmontable dams
DORDOGNE01 Montfourrat02 Laubardemont03 Le Saillant04 Bar05 Argentat06 Hautefage07 BrugaleGARONNE08 Le Temple09 Carbonne10 Labarre
01 Tuilière02 Mauzac03 Golfech04 Bazacle
Insurmontable Dams
Argentat (Dordogne)
Le Saillant (Isle)
Brugale (Cère)
Carbonne (Garonne)
Tuilières (Dordogne) Bazacle (Garonne)
Malause / Golfech (Garonne)
Downstream obstacles
Eel pass in Tuilières(hydroelectric plant
Dordogne)
Fish lift in GolfechEel pass in Golfech
Hydroelectric plant Garonne
FISHERIES- Two stages of eel fished :
glass eel yellow eel
- Two official categories of fishermen :
• Profesionnal : marine and rivermen
• Leisure : amateur and rod fishermen- A lot of poachers (non official fisherman)
MARINE PUSH NET "PIBALOUR"• pushing 2 rectangular frames of 7m² area each with a maximal depth of 1.3m. The maximum surface area authorised is 14 m²
• used by marine fishermen in the Gironde estuary
• under marine legislation : Affaires Maritimes
• boat size : from 9 to 12 m
• powerboat : less than 100 Cv
Glass eel
RIVER PUSH NET "DROSSAGE” (SINCE 1996)• pushing 2 circular frames of 1.2m of diameter, and 1.3m of maximal depth
• used by professional rivermen in the mixed area
• under fluvial legislation : DDA + Conseil Supérieur de la Pêche
• boat size : from 6 to 7 m
• powerboat : between 40 and 60 Cv
Glass eel
SCOOP NET "TAMIS"• handling a scoop net from a boat anchored to the bank or from the bank , with1.3m maximum depth.
In the public area
• all professionals (1.2m of diameter) and amateur (0.5m of diameter) in the marine and mixed area.
• marine and fluvial legislation
In the private area
• Members of Angling Federation whose have payed a specific tax.
• Mesh size : from 1.5 to 2 mm
Glass eel
• 1 m long and the mesh size is 1 mm square
PLASTIC PIPE TRAP “NASSES”
Yellow eel
Fishing gears
Three fishing gears :Glass eel
BergeracBordeaux
Agen
Toulouse
Dordogne
Garonne
Gironde
• "pibalour“
• "drossage“(since 1996)
• "tamis"
BergeracBordeaux
Agen
Toulouse
Dordogne
Garonne
Gironde
rivermen
seamen
Professional fishermenApproximately 200 along the dynamictidal area
Fishermen number and location
Recreative fishermen
amateur fishermen
rod fishermen(in all the hydrosystem)
Approximately 30.000 in the hydrosystemupstream
Evolution of glass ell fishermen number since 1978 (CEMAGREF)
Source : GIRARDIN M., CASTELNAUD G., BEAULATON L., 2003. Halieutic Monitoring of Gironde estuary - Catches monitoring 2001 - Fauna study 2002. Report for EDF CNPE du Blayais, n° étude n°79, Cemagref de Bordeaux
0
100
200
300
400
500
600
700
1977-1978
1978-1979
1979-1980
1980-1981
1981-1982
1982-1983
1983-1984
1984-1985
1985-1986
1986-1987
1987-1988
1988-1989
1989-1990
1990-1991
1991-1992
1992-1993
1993-1994
1994-1995
1995-1996
1996-1997
1997-1998
1998-1999
1999-2000
2000-2001
Num
bers
of f
ishe
rmen
pibalour tamis drossage
Source : GIRARDIN M., CASTELNAUD G., BEAULATON L., 2003. Halieutic Monitoring of Gironde estuary - Catches monitoring 2001 - Fauna study 2002. Report for EDF CNPE du Blayais, n° étude n°79, Cemagref de Bordeaux
Evolution of yellow eel fishermen number since 1978 (CEMAGREF)
0
50
100
150
200
250
300
350
400
450
1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001
Num
bers
of f
ishe
rmen
Professional Non professional
CSPDDA, DDE or SMNAmateur river fishermen
CSPDDA , DDE or SMNProfessionnal River fishermen
DDAMDDAMProfessionnal Marine fishermen
PolicyLegislation
Administrative division of the area
DDAM: Departemental Direction of Marine CompanyDDA: Departemental Direction of AgricultureDDE: Departemental Direction of EquipmentSMN: Navigation and Marine ServiceCSP: Fisheries Superior Council
Fishing period
•In the private area
Amateur fishermenProfessional river fishermen
November December January February March AprilProfessional marine fishermen
Eel glass prohibited from Saturday 6 pm to Monday 6 amIn the public area
Rod fishermen whose have payed a taxNovember December January February March April
Yellow eel from 2 hours before the sunrise to 2 hours after the sunset
Professional river fishermen
Jan. Mar.Professional marine fishermen
Feb. Apr. May Jun. Jul. Aug. Sept. Oct. Nov. Dic.In the public area
EEL STATUS• Fisheries studies
CEMAGREFCSP DDA 33AAIPPBG
Fresh water zone•Professional river fishermen•Amateur fishermen
CEMAGREFCSPAADPPEDG
ZM•Professional rivermen andseamen•Amateur fishermen
IFREMERCEMAGREF
DPMACRTS
Maritim Estuary•Professional seamen
Suivi/ sampleSuivi / carnets de pêche
Catches dataEvolution of total glass eel catches since 1978 ( CEMAGREF)
Source : GIRARDIN M., CASTELNAUD G., BEAULATON L., 2003. Halieutic Monitoring of Gironde estuary - Catches monitoring 2001 - Fauna study 2002. Report for EDF CNPE du Blayais, n° étude n°79, Cemagref de Bordeaux
0
50 000
100 000
150 000
200 000
250 000
300 000
350 000
400 000
450 000
1977-1978
1979-1980
1981-1982
1983-1984
1985-1986
1987-1988
1989-1990
1991-1992
1993-1994
1995-1996
1997-1998
1999-2000
Cat
ches
(Kg)
pibalour tamis drossage
Evolution of total yellow eel catches since 1978 ( CEMAGREF)
Source : GIRARDIN M., CASTELNAUD G., BEAULATON L., 2003. Halieutic Monitoring of Gironde estuary - Catches monitoring 2001 - Fauna study 2002. Report for EDF CNPE du Blayais, n° étude n°79, Cemagref de Bordeaux
0
50 000
100 000
150 000
200 000
250 000
300 000
1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001
Year
Cat
ches
(Kg)
Total catches Professional Total catches Non professionnal
EEL STATUS
• Distribution Study– CSP: RHP regular statistics and capture (electric fishing)
• Control Station– MI.GA.DO. et EDF, video counting in specific passes, mark, detectionand capture since the end of the 80’s (passes efficiency and estimation of eels quantity at the bottom of the obstacle)
Eel repartition (1994 –1998)
500 – 9.500 eels /ha
1 – 500 eels / ha
Source : GayouF, Garmendia L.., 2000. Plan de gestion des poissons migrateurs amphihalins Garonne – Dordogne-Charente-Leyre-Seudre – Stituation de l’anguillesur le bassin. Conseil Supérieur de la Pêche – Délégation Régionale Aquitaine –Midi-Pyrénées.
Tuilières
Control station
Golfech
05000
100001500020000250003000035000400004500050000
1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004
Ascenseur Tuilière Passe Tuilière
0
20000
40000
60000
80000
100000
120000
1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004
Ascenseur Golfech Passe Golfech
EEL STATUS
• Other studies– CEMAGREF,
• various studies about Brau Saint Louis nuclear plant impact for eels, andspecially for the glass eels.
• Numerous tesis about eel• In collaboration with AADPPEDG: study efficiency of the differents fishing
technique (Drossage vs Tamis)
– MI.GA.DO., parasitologic study (Anguillicola crassus) and ecotoxicologystudy in Tuilières: 47,56% of infestation in Dordogne river
– MI.GA.DO. et CEMAGREF, age estimation for yellow eels
