bioRxiv (Cold Spring Harbor Laboratory),
Journal Year:
2024,
Volume and Issue:
unknown
Published: Nov. 24, 2024
Atlantic
salmon
(
Salmo
salar
)
when
exposed
to
heat
stress
have
reduced
voluntary
feeding
and
exhibit
changes
in
digesta
consistency.
This
study
was
performed
determine
what
bacterial
species
occur
the
overall
abundance
gut
microbiome
stressed
salmon.
For
this
seawater
tanks
at
15°C
were
fed
for
2
4
weeks.
Tank
temperatures
increased
19°C
until
abated
which
point
tank
cooled
At
end
of
each
temperature
phase
fish
stripped
feces
profiles
determined
using
16S
rRNA
V1-V3
metabarcoding.
The
experiment
repeated
three
times
successive
years.
Vibrionaceae
comprised
most
reads
after
warm
completed.
prominent
levels
accompanied
by
a
large
predominance
cast
(sloughed
intestinal
mucosa)
containing
fecal
samples.
qPCR
estimated
cell
populations
1.9-3.4
log
units/g
but
slightly
decreased
0.3-1.1
recovery
phase.
results
indicated
induced
inappetence
corresponds
production
Vibrionaceae.
colonizing
should
be
focus
studies
on
microbiology
thermally
dysbiosis
FEMS Microbes,
Journal Year:
2024,
Volume and Issue:
5
Published: Jan. 1, 2024
Abstract
The
gut
microbiome
plays
an
important
role
in
maintaining
health
and
productivity
of
farmed
fish.
However,
the
functional
most
microorganisms
remains
unknown.
Identifying
stable
members
microbiota
understanding
their
roles
could
aid
selection
positive
traits
or
act
as
a
proxy
for
fish
aquaculture.
Here,
we
analyse
microbial
community
juvenile
Arctic
char
(Salvelinus
alpinus)
reconstruct
metabolic
potential
its
main
symbionts.
undergoes
succession
composition
during
first
weeks
post-hatch,
with
decrease
Shannon
diversity
establishment
three
dominant
bacterial
taxa.
genome
abundant
bacterium,
Mycoplasma
sp.,
shows
adaptation
to
rapid
growth
nutrient-rich
environment.
second
taxon,
Brevinema
has
versatile
potential,
including
genes
involved
host
mucin
degradation
utilization.
periods
absent
content,
Ruminococcaceae
bacterium
becomes
dominant,
possibly
outgrowing
all
other
bacteria
through
production
secondary
metabolites
quorum
sensing
cross-inhibition
while
benefiting
short-chain
fatty
acid
production.
Whereas
is
often
present
symbiont
salmonids,
show
that
species
also
detected
wild
char,
suggesting
close
evolutionary
relationship
between
this
symbiotic
bacterium.
FEMS Microbiology Ecology,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 24, 2024
Abstract
The
gut
microbiota,
which
includes
prokaryotes,
archaea,
and
eukaryotes
like
yeasts,
some
protozoa,
fungi,
significantly
impact
fish
by
affecting
digestion,
metabolism,
the
immune
system.
In
this
research,
we
combine
various
tasks
carried
out
bacteria
in
of
fish.
This
study
also
examines
microbiome
composition
marine
freshwater
fish,
identifying
important
bacterial
species
linked
to
different
biological
functions.
diversity
within
highlights
importance
considering
nutrition,
habitat,
environmental
factors
microbiological
research
on
ever-changing
indicates
that
microbial
communities
are
specifically
adapted
meet
needs
both
host
its
environment.
can
adjust
a
specific
environment
with
help
microbiota.
is
crucial
for
comprehending
complex
relationships
between
their
aquatic
environments.
These
discoveries
have
implications
aquaculture
practices,
fisheries
administration,
broader
ecological
processes
With
further
progress
area
study,
knowledge
acquired
would
offer
valuable
standpoint
enhance
our
comprehension
microbiology
sustainability
nutrition
resources.
Scientific Reports,
Journal Year:
2023,
Volume and Issue:
13(1)
Published: Dec. 19, 2023
Via
16S
rRNA
gene
amplicon
sequencing,
this
study
explores
whether
the
gut
mucus
microbiota
of
rainbow
trout
is
affected
by
interaction
a
plant-protein-based
diet
and
daily
handling
stressor
(chasing
with
fishing
net)
across
two
genetic
lines
(A,
B).
Initial
body
weights
fish
from
A
B
were
124.7
g
147.2
g,
respectively.
Fish
fed
1.5%
weight
per
day
for
59
days
either
experimental
diets,
differing
in
their
meal
[fishmeal-based
(F):
35%,
plant-based
(V):
7%]
protein
content
(diet
F:
47%,
V:
73%).
No
diet-
or
stress-related
effect
on
performance
was
observed
at
end
trial.
However,
we
found
significantly
increased
ASVs
intestinal
F
compared
to
V.
significant
differences
Shannon
diversity
could
be
between
treatments.
The
autochthonous
V
dominated
representatives
genera
Mycoplasma,
Cetobacterium,
Ruminococcaceae,
whereas
Enterobacteriaceae
Photobacterium
associated
F.
bacteria
both
separated
diet,
but
neither
stress
nor
an
interaction,
as
obtained
via
PERMANOVA.
pairwise
comparisons
revealed
that
only
stressed
fish.
Therefore,
our
findings
indicate
mucus-associated
primarily
modulated
source,
modulation
mediated
status
Frontiers in Aquaculture,
Journal Year:
2024,
Volume and Issue:
2
Published: Jan. 4, 2024
Introduction
The
availability
of
high-quality
gilthead
seabream
(
Sparus
aurata
)
larvae
in
larviculture
represents
a
major
bottleneck
to
the
aquaculture.
This
challenge
can
be
compounded
by
losses
resulting
from
emergence
clinical
disorder’s
symptomatology.
In
this
study,
observed
syndrome
included
rotated
positioning
larval
sagittal
plane
and
most
cases
leading
eventually
death.
Methods
Herein,
we
examined
using
amplicon
sequencing
16S
rDNA
bacterial
communities
associated
with
S.
at
different
conditions
(including
both
fish
no
evidence
syndrome)
during
early
developmental
stages
along
contribution
rearing
water,
organic
matter
provided
feed
microbiota
an
experiment
18
days.
Results
Over
development
larvae,
differences
were
composition
between
healthy
symptomatic
as
well
components
system.
A
remarkable
presence
members
Psychrobacter
genus
was
significant
increase
18dph.
harbor
profile
dominance
Vibrio
Bacillus
genera
3-8dph,
various
Alphaproteobacteria
11-14dph
Marinifilum
water
showed
compared
other
components,
slight
effect
3-8dph.
bacteriome
feeds
found
diverse.
Chlorella
mainly
dominated
Firmicutes,
while
Rotifer
Artemia
Proteobacteria
including
species
.
At
18dph,
seems
affect
bacteriome,
where
it
enhanced
spp.
Discussion
Interestingly,
comparative
network
analysis
18dph
indicated
that
associations
primarily
driven
genus.
While
phyla
contributed
frequencies
Proteobacteria,
Bacteroidota
Firmicutes
phyla.
Finally,
Gammaproteobacteria/Alphaproteobacteria
ratio
related
health
condition
larvae.
study
provides
valuable
information
which
used
indicators
for
monitoring
status
Research Square (Research Square),
Journal Year:
2024,
Volume and Issue:
unknown
Published: May 9, 2024
AbstractBackground.
Atlantic
salmon
(Salmo
salar)
farmed
in
seawater
Tasmania
(lutruwita)
can
experience
temper-atures
close
to
their
thermotolerance
limit
during
summer
and
Vibrionaceae
are
a
major
component
of
gut
microbiome.
This
study
focuses
on
understanding
the
microbiome
Atlantic
gastrointestinal
tract
via
taxonomy,
population
dynamics,
traits
main
colonists.
Results.
Multiyear
surveyand
co-occurrence
network
analyses
confirmed
novel
members
Aliivibrio
reliably
colonise
marine
pens
when
confounding
influences
DNA
bacteria
from
feed
water
was
considered.
Aliivibrio
Mycoplasma
were
taxa
found
mucosal
layers.
Warm
temperature(19°C)
experiments
performed
tanks
indicated
Vibrio
rapidly
become
predominant
digesta
that
had
reduced
feeding
high
faecal
cast
production
while
be
mostly
absent.Salmon-associated
isolates
share
many
genes
required
for
host
colonisation
with
faunal
mutualist
fischeri.
Though
most
seem
lack
obvious
virulence
factors,
strains
two
abundant
colonising
Aliivibriostrain
groups
possessed
cytolethal
distending
toxin
(CDT).
Conclusions.
surveys
confirm
relatively
warm
conditions
persistently
colonised
by
same,
largely
novel,
species
restricted
range
other
Vibrionaceae.
Some
these
particularly
adept
at
conditions.
some
coloniser
CDT-genes
it
is
yet
unknown
whether
CDT-gene-positive
negatively
impact
.
Since
studies
possess
different
colonization
enabling
mechanisms,
interactions
between
could
important
overall
fish
health,
especially
they
exposed
stressful
conditions,
such
as
elevated
sea
surface
temperatures.
Research Square (Research Square),
Journal Year:
2024,
Volume and Issue:
unknown
Published: May 16, 2024
Abstract
Increasing
evidence
suggests
that
gut
microbiota
is
essential
for
regulating
the
development
of
digestive
system,
aiding
digestion,
nutrient
metabolism,
growth,
immune
function,
and
disease
resistance.
Advances
in
high
throughput
sequencing
technologies
have
allowed
a
broader
understanding
complex
fish,
especially
relation
to
impact
dietary
plant
ingredients
on
health.
However,
date,
most
studies
focused
entire
or
distal
response
plant-based
diet.
Moreover,
potential
involvement
microbiome
driving
adaptation
early-exposed
Atlantic
salmon
diet
during
later
developmental
stage,
phenomenon
commonly
referred
as
‘nutritional
programming’,
has
yet
be
demonstrated.
The
aim
was
characterise
compare
composition
diversity
regions
(pyloric
caeca,
middle
intestines)
(maintained
22
weeks
from
first
feeding
recirculating
aquaculture
system)
with
without
nutritional
programming
using
16S
rRNA
amplicons
employed
monitor
taxa
were
identified
amplicon
sequence
variants.
study
experiment
followed
typical
design
two
experimental
groups.
Fish
initially
exposed
at
challenged
16
post
first-feeding
six
similar
considered
programmed
group,
whereas
those
fed
marine
control
group.
alpha
higher
pyloric
caeca
than
intestine.
Analysis
similarities
showed
differentiated
each
after
both
low-abundant
taxa.
Ruminococcaceae
(primarily
anaerobic
Clostridia)
comprised
core
80%
fish
group
across
three
known
help
ferment
ingredients.
internal
environment
region
mainly
selects
their
microbial
assemblages.
Additionally,
feed
water
revealed
influence
fish.
Furthermore,
Firmicutes,
Proteobacteria,
ActinobacteriotaBacteroidota
prevalent
dominant
phyla
regardless
region.
Further
research
required
better
understand
its
functional
consequences
carnivorous