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

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appear to be surging upward. In terms of capture rates, there
are currently more number being caught than Arctic char.
If we look at the catches taken by the FDPPMA from
1995 to 2005 in terms of UFE (×1000), char and perch are
also dominant species (Fig. 21.4 ). However, these results are
skewed by the fact that they relate to species most likely to
be caught by the selective range of mesh sizes used, and most
importantly by the fact that they correspond to targeting at
spots and depths specifi c to char, a species much sought after
by the lake farmer.
This selectivity is particularly evident when comparing
these results against comprehensive catches made following

the WFD protocol NF EN 14757 (AFNOR 2005 ), which

showed a reverse order of dominant species and a surge in

numbers of certain species that had been rarely caught

between 1995 and 2005 but have risen fast between 2005 and

2013 (Fig. 21.5 ).

Although the selectivity in catch methods used between

1995 and 2005 has a huge infl uence on species representa-

tion rates, it does also show a relative stability in Arctic char

catches. The value given for catches taken by the FDPPMA

is an 11-year cumulative CPUE compared against CPUEs

obtained by the standardized method.

Table 21.1 Evolution of the fi sh population by study period

Olivier ( 1939 ) FDPPMA63 (1995–2005) ASCONIT ( 2006 ) ONEMA 2012

Austropotamobius pallipes Austropotamobius pallipes

Carrassius carrassius

Cyprinus carpio

Gasterosteus aculeatus

Gobio gobio Gobio gobio Gobio gobio Gobio gobio

Squalius cephalus Squalius cephalus Squalius cephalus

Neimachulus barbatulus

Oncorhynchus mykiss Oncorhynchus mykiss Oncorhynchus mykiss

Phoxinus phoxinus Phoxinus phoxinus

Perca fl uviatilis Perca fl uviatilis Perca fl uviatilis

Rutilus rutilus Rutilus rutilus Rutilus rutilus

Salmo trutta fario Salmo trutta fario

Salvelinus alpinus Salvelinus alpinus Salvelinus alpinus Salvelinus alpinus

Scardinius erythrophtalmus Scardinius erythrophtalmus

Tinca tinca Tinca tinca

0

10

20

30

40

50

60

70

80

90

100

obl per tac rot che trf gar gou car tan

1995-2005

Onema 2005

Onema 2013

Fig. 21.3 Evolution of numerical abundance
in percent ( Obl: Salvelinus alpinus ; Per: Perca
fl uviatilis ; Tac: Oncorhynchus mikiss ; Rot:
Scardinius erythrophtalmus ; Che: Squalius
cephalus ; Trf: Salmo trutta ; Gar: Rutilus
rutilus ; Car: Carassius auratus ; Tan: Tinca
tinca)

21 History of the Fish Fauna of Lake Pavin: A Population Heavily Infl uenced by Man?