9646

• UCREFRP Catalog Number: 9646
• Author: Wiley, R. W. and R. S. Wydoski.
• Title: Management of Undesirable Fish Species.
• USFW Year: 1993.
• USFW - Doc Type: 335-354
• Copyright Material: YES

UNDESIRABLE SPECIES

337

1900 -1910
1911 - 1920
....
1921 -1930
en 1931 - 1940
a::
~
w
>- 1941 -1950

1951 -1960

...................................
::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

1961-1970

1971 -1980 ':;
o 5 10 15 20 25 30 35 40 45

PERCENT OF ALL RESPONSES

Figure 14.1 Recognition (stippled bar) of need to control undesirable species of fish and
implementation (clear bar) of control programs by conservation agencies. (Data for this and
subsequent figures provided by state and provincial agencies in response to a [988
questionnaire. )

increased consideration of fish communities. North American fisheries managers
reported that mechanical control methods are not often used because they are
labor intensive and generally ineffective (Dunst et al. 1974). Criteria used in
selecting a method to control problem fishes include cost, size of water body,
water temperature and quality, target species, public opinion, ownership of water,
environmental concerns, and location of the water body (Figure 14.2).
All control programs should involve an awareness of the entire fish community
because targeting a single species without regard to its relationship to others in the

Table 14.1 Families of North American freshwater fishes that have been targeted for
control. Values given for the three control methods are percentages.
Number of Control method
Family states and provinces Biological Chemical Mechanical
Amiidae 1 100
Castostomidae II 28 41 31
Centrarchidae 19 36 38 26
Characidae 1 50 50
Cichlidae 1 25 50 25
Clupeidae 13 47 32 21
Cyprinidae 22 28 50 22
Escocidae I 67 33
Ictaluridae \I 21 48 31
Lepisostiidae 1 33 67
Percidae 9 39 26 35
Petromizontidae 2 60 40
Salmonidae 7 21 32 47
Scianidae I 33 33 33