Migration
allows
animals
to
exploit
conditions
across
distinct
habitats
maximize
their
potential
fitness.
These
movements
are
dependent
on
connectivity
between
that
make
it
possible
for
move
unencumbered.
In
freshwater
ecosystems,
dams
and
other
barriers
can
compromise
restrict
the
movement
of
migrating
fish
(among
organisms).
The
central
objective
this
thesis
was
evaluate
consequences
physical
during
long-distance
upstream
migrations
through
rivers.
This
generates
multiple
lines
evidence
objective,
including
a
literature
synthesis,
as
well
ecological,
social
science,
physiological
data,
with
much
research
focusing
Chinook
salmon
upper
Yukon
River
undertake
one
world's
longest
inland
migrations.
First,
I
conducted
synthesis
identify
broad
scale
impacts
hydropower
fish.
Next,
evaluated
fishway
restore
beyond
barrier
situated
in
terminal
reach
migration.
then
considered
how
knowledge
developed
preceding
chapters
inform
practice
passage
by
surveying
engineers
scientists
state
collaboration
dissemination
field.
Finally,
assessed
efficacy
an
ex-situ
approach
off-setting
-
hatchery
production.
revealed
(and
broader
ecosystem)
be
severe,
but
approaches
taken
minimize
these
(Chapter
2).
Fishways
such
approach,
they
not
always
effective
migrants
like
(Chapters
3-5).
Part
solution
may
more
frequent
amongst
professionals
enhance
effectiveness
facilities
6).
Hatcheries
complement
efforts,
though
differences
wild
should
7).
Findings
from
highlight
importance
maintaining
migratory
benefit
ecosystems
people
depend
them.
Water,
Год журнала:
2024,
Номер
16(3), С. 439 - 439
Опубликована: Янв. 29, 2024
Throughout
the
world,
emerging
barriers
in
river
systems
block
longitudinal
connectivity
for
migrating
fish,
causing
significant
impacts
by
precluding
them
from
carrying
out
vital
life
cycle
activities.
Fishways
are
still
main
mitigation
solution
implemented,
where
barrier
removal
is
not
feasible.
Within
multiple
technical
fish
passage
devices,
vertical
slot
fishway
(VSF)
considered
most
reliable.
Early
design
guidelines,
established
cyprinids,
indicate
that
volumetric
dissipation
power
(Pv)
pools
should
be
Pv
<
150
Wm−3,
while
frequent
slope
values
range
10
to
12%.
In
this
study,
an
experimental
approach
was
conducted
question
and
debate
validity
of
these
recommendations.
For
this,
Iberian
barbel
(Luciobarbus
bocagei,
Steindachner,
1864)
performance
assessed
a
full-scale
exceeded
under
different
configurations.
These
varied
discharge
(Q)
mean
pool
water
depth
(hm):
VSF1
(Q
=
81
Ls−1;
hm
0.55
m);
VSF2
110
0.80
same
equipped
with
deep
notch:
DN1
71
DN2
99
m).
The
set
15.2%
head
drop
per
Δh
0.28
m,
which
generated
ranged
222
187
Wm−3
DN2.
Passage
behaviour
using
PIT
telemetry
time-to-event
analysis
evaluate
upstream
standardized
metrics:
(i)
motivation
(ii)
ascend
success,
(iii)
transit
time.
hydrodynamic
scenarios
experienced
were
characterized
through
numerical
model
computational
fluid
dynamics
(CFD).
results,
contrary
what
expected,
showed
higher
confirmed
ascent
Although
no
differences
found
motivation,
results
larger
displayed
lower
times
perform
first
attempt.
CFD
show
that,
although
maximum
velocities
turbulence
(turbulent
kinetic
energy
(TKE)
Reynolds
shear
stress
(RSS))
do
change
significantly
between
configurations,
their
distribution
quite
different.
Regarding
TKE,
volumes
magnitudes
than
0.05
m2s−2
notorious
both
configurations
compared
VSF1,
influencing
efficiency
line
time
metrics
results.
Overall,
present
research
undeniably
debates
literature
guidelines
reinforces
need
jointly
assess
species-specific
criteria
hydrodynamics,
whereas
precaution
taken
when
very
general
Canadian Journal of Fisheries and Aquatic Sciences,
Год журнала:
2024,
Номер
81(9), С. 1174 - 1216
Опубликована: Фев. 15, 2024
Salmonids
undertake
long
and
strenuous
migrations
that
require
aerobic
endurance
anaerobic
burst
swimming.
Anthropogenic
activity
natural
disasters
can
make
already
challenging
even
more
difficult.
This
reinvigorates
a
central
question:
what
is
the
maximum
swimming
capacity
of
adult
salmon
species
across
environmental
conditions?
We
synthesized
literature
on
swim
performance
(
Oncorhynchus
spp.
Salmo
salar)
to
unfold
known
about
how
biological
(sex
body
size)
physical
(temperature)
factors
affect
in
salmon.
Maximum
swimming—bursting,
jumping,
leaping—are
among
least
studied
performances
salmonids.
Commonly,
has
been
measured
using
flumes,
but
evidently
faster
wild
than
this
set-up
capture.
show
larger
fish
outswim
smaller
ones,
thermal
sensitivity
differs
inter-and
-intra-specifically.
Unresolved
are
temperatures,
between
males
females
maturity
states.
information
be
used
inform
exercise
physiology
research
future
management
mitigation
actions
necessary
conserve
these
iconic,
economically
valuable
species.
Abstract
The
importance
of
thermal
refuges
in
a
rapidly
warming
world
is
particularly
evident
for
migratory
species,
where
individuals
encounter
wide
range
conditions
throughout
their
lives.
In
this
study,
we
used
spatially
explicit,
individual‐based
simulation
model
to
evaluate
the
buffering
potential
cold‐water
anadromous
salmon
and
trout
(
Oncorhynchus
spp.)
migrating
upstream
through
warm
river
corridor
that
can
expose
physiologically
stressful
temperatures.
We
considered
migration
relation
phenotypes
were
defined
terms
timing,
spawn
swim
speed,
use
refuges.
Individuals
with
different
migrated
riverine
corridors
variable
availability
mainstem
Use
(CWRs)
decreased
accumulated
sublethal
exposures
temperatures
when
measured
degree‐days
above
20,
21,
22°C.
CWRs
was
an
order
magnitude
more
effective
lowering
under
current
future
summer
steelhead
than
fall
Chinook
Salmon.
two
emergent
outcomes,
survival
percent
available
energy
used,
heterogeneity
phenotype.
Mean
loss
attributed
warmer
at
least
times
larger
difference
simulations
without
salmon.
also
found
reduced
diversity
energy‐conserving
examined
variability
entry
timing
travel
time
outside
loss.
Energy‐conserving
phenotypic
space
contracted
by
7%–23%
unavailable
regime.
Our
suggest
that,
while
do
not
entirely
mitigate
rivers,
these
features
are
important
maintaining
phenotypes.
study
suggests
maintenance
diverse
portfolios
cool‐
might
be
added
suite
policies
management
actions
presently
being
deployed
improve
likelihood
Pacific
salmonid
persistence
into
characterized
climate
change.
Hydrology,
Год журнала:
2025,
Номер
12(4), С. 91 - 91
Опубликована: Апрель 16, 2025
Leaky
dams
have
become
essential
nature-based
solutions
for
flood
management,
providing
sustainable
alternatives
to
traditional
engineered
control
methods.
This
review
delves
into
the
mechanisms
by
which
leaky
operate,
including
regulation
of
water
flow
through
velocity
reduction
and
distribution
across
floodplains,
effective
sediment
trapping
soil
quality
enhancement,
facilitation
groundwater
recharge
table
stabilization.
These
structures
not
only
mitigate
peak
flows
reduce
erosion
but
also
contribute
enhanced
biodiversity
creating
diverse
aquatic
habitats
maintaining
ecological
connectivity.
The
effectiveness
is
assessed
various
performance
metrics,
demonstrating
significant
reductions
in
flows,
improved
increased
levels,
collectively
enhance
ecosystem
resilience
quality.
However,
implementation
presents
several
technical
challenges,
such
as
design
complexity,
hydrological
variability,
maintenance
requirements,
socio-economic
factors
like
land
use
conflicts
economic
viability.
Additionally,
while
offer
numerous
environmental
benefits,
potential
negative
impacts
include
habitat
disruption,
accumulation,
alterations
quality,
necessitate
careful
planning
adaptive
management
strategies.
Emerging
trends
dam
development
focus
on
integration
smart
technologies,
real-time
monitoring
systems
artificial
intelligence,
optimize
against
climate-induced
extreme
weather
events.
Advances
modeling
technologies
are
facilitating
networks,
promoting
their
incorporation
comprehensive
watershed
frameworks.
highlights
integral
components
systems,
advocating
broader
adoption
alongside
conventional
engineering
achieve
resilient
ecologically
balanced
management.
Ecology Of Freshwater Fish,
Год журнала:
2023,
Номер
33(3)
Опубликована: Дек. 31, 2023
Abstract
An
increasing
presence
of
instream
structures
such
as
weirs,
dams,
culverts
and
reservoirs
degrades
habitats,
fragments
rivers
blocks
fish
movements
worldwide.
Longitudinal
river
are
fundamental
for
many
species
the
most
widespread
solution
to
restore
longitudinal
connectivity
is
implementation
different
passage
solutions.
Fishway
functionality,
however,
highly
variable.
To
design
a
functional
fishway,
several
aspects
fish's
interaction
with
its
environment
need
be
taken
into
consideration.
Artificial
light
at
night
(ALAN)
can
affect
range
behaviours
in
fish,
from
activity
movement
feeding
predator–prey
relationships.
In
setting,
exposed
artificial
form
pollution,
but,
sometimes,
also
part
solution.
Although
likely
specific,
effect
on
behaviour
has
been
little
explored.
Here
we
study
two
small‐sized
species,
European
gudgeon
(
Gobio
gobio
)
Italian
riffle
dace
Telestes
muticellus
),
over
scaled
deep
side
notch
weir
hydraulic
flume
three
conditions:
daylight,
darkness
ALAN.
both
passed
obstacle
high
efficiencies
under
all
conditions,
their
were
influenced
by
light,
particularly
higher
levels.
While
ALAN
reduced
success
resulted
delayed
gudgeon,
rates
compared
treatment.
Both
results
indicate
risk
negative
effects
performance
real
fishways—or
lit
areas
natural
streams—for
species.
Independent
individuals
faster
after
repeated
trials,
demonstrating
learning
context.
River Research and Applications,
Год журнала:
2024,
Номер
40(7), С. 1205 - 1218
Опубликована: Май 27, 2024
Abstract
A
challenge
in
the
design
of
fishways
especially
for
large
rivers
is
trade‐off
between
attraction
and
passability
entrance.
High
flow
velocities
entrance
slot
generate
a
strong
tend
to
have
better
efficiency
upstream
migration.
However,
these
may
also
prevent
small‐bodied
species
or
juvenile
fish
from
entering
fishway.
With
our
experiment,
we
reproduced
swimming
behaviour
passage
fishway
under
realistic
hydraulic
conditions.
At
an
with
0.4
m
width
four
0.8,
1.2,
1.5
1.8
ms
−1
were
investigated.
In
total,
326
roach
(
Rutilus
rutilus
(Linnaeus,
1758)),
gudgeons
Gobio
gobio
1758))
spirlins
Alburnoides
bipunctatus
(Bloch,
1782))
tested.
The
rates
three
tested
altogether
higher
than
would
been
predicted
reported
capacities.
They
increased
(significantly)
could
show
how
decreased
increasing
velocities,
suggesting
species‐specific
critical
velocities.
Still,
are
lower
those
currently
proposed
sufficient
flow,
which
implications
design.
