North American Journal of Fisheries Management,
Год журнала:
2023,
Номер
43(6), С. 1673 - 1686
Опубликована: Ноя. 7, 2023
Abstract
Objective
In
recent
decades,
widespread
evidence
of
declining
Walleye
Sander
vitreus
recruitment
in
the
Midwestern
United
States
has
raised
concerns
about
diminishing
ecological
benefits
and
fishing
opportunities,
which
turn
resulted
natural
resource
agencies
using
stocking
to
supplement
populations.
Success
events
vary;
thus,
evaluating
external
factors
that
influence
success
resulting
from
or
production
is
critical
for
improved
management.
Methods
We
evaluated
influencing
relative
98
lakes
stocked
annually
with
by
integrating
20
years
data
fisheries
assessment
abiotic
data.
indexed
as
abundance
cohorts
sources
combined
used
boosted
regression
tree
modeling
identify
variables
are
associated
varying
recruitment.
Result
Growing
degree‐days
at
age
1,
shoreline
development
index,
mean
depth,
2
were
most
important
variables.
The
model
explained
17%
observed
variability
A
positive
relationship
between
growing
was
observed,
whereas
lake
depth
had
a
negative
Secondarily
predictors
surface
area,
spring
warming
rate,
Northern
Pike
Esox
lucius
abundance,
0.
general,
positively
these
predictors,
exceptions
rates
>0.3°C/day
being
exposed
>3500
Conclusion
Our
results
indicate
thermal
addition
characteristics
drivers
waters
highlights
potential
managers
use
this
information
prioritize
efforts
temperate
lakes.
Fisheries Management and Ecology,
Год журнала:
2022,
Номер
29(4), С. 409 - 422
Опубликована: Март 19, 2022
Abstract
Climate
change
is
impacting
natural
ecosystems
and
the
services
they
provide
at
an
unprecedented
rate,
yet
management
not
keeping
pace
with
radical
ecosystem
transformations.
Management
in
marine
systems
primarily
designed
to
regulate
fishing
pressures,
which
may
be
of
limited
use
addressing
large‐scale
climate
impacts.
The
Resist‐Accept‐Direct
(RAD)
a
flexible,
novel
framework
that
gives
managers
way
structure
plan
how
respond
shifts/transformations
ecosystems.
We
present
case
studies
broad
scale
impacts
outline
responses
fit
into
RAD
concept.
address
collapse
kelp
forest
northern
California
examine
potential
policy
guiding
restoration
strategies
can
organised.
conclude
response
most
transformations
has
been
resist
strategy
includes
adaptive
management,
we
suggest
for
forests
provides
best
option
moving
forward.
will
useful
have
reached
their
tipping
points
now
require
tools
thinking
as
face
stressors
unpredictable
future.
North American Journal of Fisheries Management,
Год журнала:
2022,
Номер
42(5), С. 1202 - 1214
Опубликована: Июль 15, 2022
Abstract
Walleye
Sander
vitreus
natural
recruitment
has
declined
in
northern
Wisconsin
lakes
over
time.
Several
factors
have
been
implicated
to
explain
declines
Wisconsin,
including
climate
change,
Largemouth
Bass
Micropterus
salmoides
interactions,
less
desirable
fish
communities,
production
overharvest,
and
depensatory
effects
on
recruit
survival.
Previous
research
other
systems
suggested
that
White
Crappie
Pomoxis
annularis
negatively
influence
recruitment,
but
interactions
between
Black
nigromaculatus
not
examined.
We
evaluated
trends
age‐0
relative
abundance
(catch
per
effort
[CPE])
collected
during
1991–2017.
Specifically,
we
tested
for
(1)
CPE
time,
(2)
a
relationship
CPE,
(3)
the
of
several
abiotic
biotic
covariates
(including
CPE)
recruitment.
Age‐0
increased
significantly
Within
lakes,
showed
threshold
effect
such
was
always
low
when
high.
Of
variability
relationship,
only
significant.
Our
results
suggest
may
recruitment;
however,
caution
our
findings
reveal
pattern
mechanistic
explanation
negative
species.
Additional
is
needed
test
inform
comanagement
these
Fisheries,
Год журнала:
2024,
Номер
49(10), С. 463 - 474
Опубликована: Сен. 5, 2024
Abstract
Rapid
technological
advancement
often
receives
a
mix
of
criticism
and
welcome
implementation.
Fishing
technologies,
such
as
sonar,
are
believed
to
enable
anglers
be
more
efficient
effective
in
their
angling.
There
concerns
from
managers
increased
catch
by
technology
users.
We
assessed
the
relationships
between
use—defined
use
imaging
sonar
underwater
cameras—and
catch,
angler
expectations
trip
satisfaction
using
dual
intercept
creel
survey.
Angling
technologies
were
used
80%
79%
intercepted
boat
ice
anglers,
respectively,
but
only
3.9%
shore
anglers.
expected
for
game
fish
not
panfish
had
no
effect
on
actual
either
group.
Most
caught
fewer
than
expected,
did
improve
ability
meet
expectations.
Technology
was
associated
with
decreased
overall
among
These
results
suggest
that
about
fishing
increasing
may
warranted.
Rather,
affect
negatively
impact
satisfaction,
potentially
influencing
behavior.
North American Journal of Fisheries Management,
Год журнала:
2024,
Номер
unknown
Опубликована: Сен. 15, 2024
Abstract
Objective
The
objective
of
this
study
was
to
evaluate
stocking
success
Walleye
Sander
vitreus
in
lakes
and
reservoirs
across
the
Midwestern
United
States
inform
practices
for
state
agencies.
Demand
may
increase
if
climate
change
limits
potential
natural
recruitment
lakes.
Consequently,
strategic
distribution
maximize
fishing
opportunities.
Methods
We
synthesized
data
from
2226
fry
fingerling
events
on
653
used
random
forest
algorithms
mixed‐effects
linear
models
identify
abiotic
biotic
factors
related
success.
Result
Latitude
year
explained
relatively
little
variation
compared
within‐lake
variation.
Relative
abundance
Largemouth
Bass
Micropterus
nigricans
an
important
indicator
fingerlings,
with
generally
decreasing
increased
bass
abundance.
There
interaction
between
lake
surface
area
growing
degree‐days,
as
large
(>2500
ha)
seemed
be
more
conducive
regardless
degree‐days.
that
we
developed
did
not
accurately
predict
exact
levels
but
were
92–94%
accurate
predicting
whether
both
fingerlings
would
at
or
above
50th
percentile.
Conclusion
These
findings
help
management
allocation
suggest
future
increases
degree‐days
could
limit
effectiveness
some
North American Journal of Fisheries Management,
Год журнала:
2023,
Номер
43(6), С. 1673 - 1686
Опубликована: Ноя. 7, 2023
Abstract
Objective
In
recent
decades,
widespread
evidence
of
declining
Walleye
Sander
vitreus
recruitment
in
the
Midwestern
United
States
has
raised
concerns
about
diminishing
ecological
benefits
and
fishing
opportunities,
which
turn
resulted
natural
resource
agencies
using
stocking
to
supplement
populations.
Success
events
vary;
thus,
evaluating
external
factors
that
influence
success
resulting
from
or
production
is
critical
for
improved
management.
Methods
We
evaluated
influencing
relative
98
lakes
stocked
annually
with
by
integrating
20
years
data
fisheries
assessment
abiotic
data.
indexed
as
abundance
cohorts
sources
combined
used
boosted
regression
tree
modeling
identify
variables
are
associated
varying
recruitment.
Result
Growing
degree‐days
at
age
1,
shoreline
development
index,
mean
depth,
2
were
most
important
variables.
The
model
explained
17%
observed
variability
A
positive
relationship
between
growing
was
observed,
whereas
lake
depth
had
a
negative
Secondarily
predictors
surface
area,
spring
warming
rate,
Northern
Pike
Esox
lucius
abundance,
0.
general,
positively
these
predictors,
exceptions
rates
>0.3°C/day
being
exposed
>3500
Conclusion
Our
results
indicate
thermal
addition
characteristics
drivers
waters
highlights
potential
managers
use
this
information
prioritize
efforts
temperate
lakes.