Are we heading towards a global decrease in coregonine catches?
International Journal of Limnology,
Journal Year:
2025,
Volume and Issue:
61, P. 6 - 6
Published: Jan. 1, 2025
Coregonines
have
specific
ecological
needs,
making
them
potentially
very
vulnerable
to
changes
in
lake
conditions.
A
contemporary
concern
is
that
many
lakes
worldwide
are
experiencing
environmental
due
anthropogenic
pressure
and
climate
warming.
Here,
we
compiled
long-term
data
of
coregonine
catches
from
27
three
continents
the
northern
hemisphere.
Declines
catch
were
observed
67%
during
first
two
decades
21
st
century,
with
a
significant
trend
(p-value<0.05)
44%
cases.
An
analysis
determine
whether
trends
globally
linked
conditions
attributes
was
carried
out
on
26
for
period
2000–2019.
Several
local
declines
had
already
been
documented
literature
likely
be
forcing
such
as
nutrients,
species
invasions
fishing
practices.
Nevertheless,
global
scale,
our
results
indicate
lakes,
which
exhibited
decrease
larger
more
nutrient-poor
than
other
lakes.
The
rate
change
appeared
related
trophic
state
lake.
effect
warming
difficult
studied
period.
When
occurred
outside
egg
incubation,
decreasing
frequently
mesotrophic
In
conclusion,
findings
suggest
achieving
oligo-
or
ultraoligotrophic
conditions,
required
developed
countries
control
phytoplankton
blooms
enhance
water
quality,
could
pose
challenges
future
management
fisheries.
Language: Английский
Evaluation of post-stocking survival and movement of hatchery-reared juvenile bloater (Coregonus hoyi) stocked across bathymetric depths in Lake Ontario
Canadian Journal of Fisheries and Aquatic Sciences,
Journal Year:
2025,
Volume and Issue:
82, P. 1 - 14
Published: Jan. 1, 2025
Bloater
(
Coregonus
hoyi),
extirpated
from
Lake
Ontario
in
the
1980s,
have
been
stocked
annually
since
2012
with
limited
success
re-establishing
a
self-sustaining
population.
In
this
study,
hatchery-raised
juvenile
bloater
were
tagged
acoustic
telemetry
high-resolution
predation
tags
and
over
three
depths
(5,
50,
100
m)
2022
2023
to
quantify
survival,
causes
of
mortality,
movement.
Time-to-event
modelling
generated
3-week
survival
estimate
38%
(31%–46%;
95%
confidence
interval)
across
both
years,
lower
year
1
(12%;
12%–38%)
than
2
(44%;
33%–59%).
The
deepest
depth
(100
yielded
highest
mortality
due
more
common
at
shallower
depths,
while
non-predation
potentially
compression
barotrauma,
was
prevalent
deeper
water.
Rapid
dispersion
following
release
observed
greater
distances
travelled
2023.
This
study
revealed
low
initial
for
that
varied
between
years
stocking
highlighted
different
potential
sources
associated
depth,
providing
new
information
consideration
techniques
large
lakes.
Language: Английский