Lake Pavin History, geology, biogeochemistry, and sedimentology of a deep meromictic maar lake

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21.4 Study of Arctic Char

Most of the fi sh fauna monitoring done on the lake has
focused on its most emblematic species—the Arctic char.
Indeed, Arctic char is as highly prized by anglers as it is by
the manager of the lake restaurant. Relatively large stocks
have been taken for years, but changes in the trophic status of
the lake are now a cause for major concern over the future of
this species.

21.4.1 Biology of the Species

Its biological requirements have been well documented in a

great number of lakes, but not in Lake Pavin where few stud-

ies have focused on fi sh. In 1995, Jamet tracked the repro-

duction, feeding, and body weight patterns of the Arctic char

in Lake Pavin. In 1997 , Léveillé led a study on the use of

fatty acids as organic markers of transfer in the phytoplank-

ton, zooplankton, and Arctic char food chains.

FDPPMA 1995

FDPPMA 1996

FDPPMA 1997

FDPPMA 1998

FDPPMA 1999 FDPPMA 2000

FDPPMA 2001 FDPPMA 2002

FDPPMA 2003 FDPPMA 2004

FDPPMA 2005ASCONIT 2005

ONEMA 2013

0

2

4

6

8

10

12

obl tac per

che rot gar

gou

Fig. 21.4 Annual evolution of CPUE (Catch Per Unit
Effort * 1000) by species and year ( Obl: Salvelinus
alpinus ; Tac: Oncorhynchus mikiss ; Per: Perca fl uviatilis;
Rot: Scardinius erythrophtalmus ; Che: Squalius cephalus ;
Gar: Rutilus rutilus; Gou: Gobio sp)

0

1

2

3

4

5

6

7

8

obl trf tac per che rot gar gou car tan

FDPPMA ASCONIT ONEMA

Fig. 21.5 Comparison on a CPUE
(*1000) basis ( Obl: Salvelinus
alpinus ; Trf: Salmo trutta ; Tac:
Oncorhynchus mikiss; Per: Perca
fl uviatilis ; Che: Squalius cephalus ;
Rot: Scardinius erythrophtalmus
Gar: Rutilus rutilus ; Gou: Gobio
sp ; Car: Carassius auratus ; Tan:
Tinca tinca)

F. D e s m o l l e s

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