Fishes,
Journal Year:
2024,
Volume and Issue:
9(10), P. 393 - 393
Published: Sept. 30, 2024
The
Mexican
pike
silverside
(Chirostoma
estor)
is
a
zooplanktivorous,
agastric
short-intestined
species,
and
it
has
been
found
that
increased-frequency
feeding
(twelve
feedings
day)
improved
feed
efficiency
promoted
growth
by
70%.
This
work
determined
the
effect
of
different
juvenile
frequencies
upon
C.
estor
liver
transcriptome.
level
expression
appetite-regulating
peptides
was
analyzed
in
silico
to
understand
mechanisms
involved
appetite
control
this
species.
Differential
analysis
showed
up-regulated
genes
between
treatments
were
related
metabolism,
digestive
processes,
immune
system
response,
apoptosis,
growth,
oxidative
stress.
information
explains
better
performance
fed
12
times
daily.
Appetite
regulatory
identified
for
first
time
response
high
frequencies,
contributing
general
knowledge
roles
each
family
neuropeptides
agastric,
fish.
presented
here
emphasizes
need
explore
further
complex
physiological
processes
regulation
estor.
Additionally,
will
serve
as
basis
more
specific
targeted
studies
elucidate
behind
process.
Frontiers in Marine Science,
Journal Year:
2025,
Volume and Issue:
11
Published: Jan. 10, 2025
The
importance
of
the
gastrointestinal
microbiota
(GM)
in
health
and
disease
is
widely
recognized.
Although
less
known
fish
than
mammals,
advances
molecular
techniques,
such
as
16S
rRNA
sequencing,
have
facilitated
characterization
GM,
comprising
resident
autochthonous
transient
allochthonous
bacteria.
microbial
diversity
composition
are
strongly
influenced
by
diet.
High-protein
diets,
including
alternative
ingredients
like
plant
insect
proteins,
modify
impacting
beneficial
bacteria
e.g.
Cetobacterium
.
Lipids
affect
metabolism
short-chain
fatty
acid
(SCFA)
production,
while
excessive
carbohydrates
can
disrupt
GM
balance,
causing
enteritis.
Dietary
additives,
probiotics,
prebiotics,
antibiotics,
effectively
modulate
GM.
Probiotics
enhance
immunity
growth,
prebiotics
support
bacteria,
though
effective
against
pathogens,
may
promote
antibiotic
resistance.
Environmental
factors,
temperature,
salinity,
pollution,
significantly
influence
Elevated
temperatures
salinity
shifts
alter
composition,
pollutants
introduce
toxins
that
compromise
intestinal
function
diversity.
Stress
pathogen
infections
further
destabilize
often
favoring
pathogenic
communicates
with
host
via
metabolites
SCFAs,
bile
acids,
neurotransmitters,
regulating
appetite,
energy
metabolism,
immunity,
neural
functions.
Additionally,
influences
immune
system
interacting
epithelial
cells
stimulating
responses.
Despite
recent
advances,
research
needed
to
elucidate
species-specific
mechanisms
underlying
GM-host
interactions,
ecological
implications
diversity,
its
applications
aquaculture
optimize
performance.
Aquaculture International,
Journal Year:
2025,
Volume and Issue:
33(2)
Published: Jan. 10, 2025
Abstract
The
study
aims
to
evaluate
the
reproductive
performance,
serum
biochemical
indices,
growth,
antioxidant
capacity,
and
immune
response
of
Florida
Red
Tilapia
(
Oreochromis
sp.)
progeny
reared
at
different
salinity
levels
within
biofloc
technology
(BFT)
systems,
focusing
on
egg
production,
fertilization
rates,
tolerance
oxidative
stress,
offspring
performance.
Broodstock
in
systems
(BF)
were
compared
those
clear
water
(Without
biofloc,
WBF)
across
three
(18,
28,
36‰)
over
a
7-month
period.
also
assessed
fry
direct
transfer
high
(36‰)
without
prior
acclimatization.
A
total
216
females
(initial
body
weight:
182
±
1.8
g)
72
males
201
0.88
randomly
assigned
18
concrete
tanks
(2
×
6
1
m)
investigate
effects
BFT
spawning
performance
larval
survival
under
high-salinity
conditions.
findings
indicated
that
appropriate
(18‰)
positively
affected
efficiency,
enhanced
immunological
parameters,
improved
growth
but
elevated
led
reduced
success
hindered
red
tilapia
thrive
quality
conditions
are
acceptable
limits.
High
environments
increased
dissolved
oxygen
pH,
especially
ponds.
time,
production.
It
hatchability,
quality,
yolk
sac
absorption.
broodstock
showed
higher
key
proteins
(total
protein,
albumin,
globulin)
which
helped
counteract
negative
their
overall
health
stress
tolerance.
In
environments,
rates
rates.
conclusion,
improves
salinity.
enhances
survival,
while
improving
function,
making
it
sustainable
solution
for
aquaculture
saline
environments.
General and Comparative Endocrinology,
Journal Year:
2025,
Volume and Issue:
unknown, P. 114730 - 114730
Published: April 1, 2025
Tiger
barbs
are
popular
tropical
aquarium
fish
but
despite
their
economic
importance,
nothing
is
known
about
feeding
physiology,
in
particular
endocrine
regulation
of
feeding.
The
tiger
barb
has
also
been
used
to
make
genetically
modified
fluorescent
the
influence
this
genetic
modification
on
physiology
poorly
understood.
In
study,
we
submitted
both
non-transgenic
(NT)
and
transgenic
orange
(T)
2
weeks
fasting
or
different
temperatures
(20,
25
30
°C)
assessed
food
intake
expression
appetite
regulators
brain,
intestine
liver.
Fasting
had
no
effect
intestine,
decreased
liver
leptin
NT
only.
caused
an
overall
increase
decrease
brain
orexigenic
anorexigenic
factors,
respectively.
nature
peptides
affected
by
response
differed
between
strains
(MCH,
ghrelin,
POMCb
T,
orexin
only,
CRF
CCK
T
only).
fish,
increasing
increased
intake.
Temperature
most
examined,
effects
two
strains.
A
shift
from
20
°C
hepatic
ghrelin
expression.
did
not
affect
expressions,
orexin,
MCH
CCKa
expressions
T.
Our
study
presents
new
information
barb,
provides
insights
how
transgenesis
might
fish.
Canadian Journal of Fisheries and Aquatic Sciences,
Journal Year:
2025,
Volume and Issue:
82, P. 1 - 15
Published: Jan. 1, 2025
Variation
in
transcriptomic
responses
is
recognized
as
an
underlying
mechanism
driving
phenotypic
to
environmental
variations.
Whether
this
variation
adaptive
or
maladaptive
can
have
significant
implications
for
the
evolutionary
trajectory
of
populations.
Understanding
inheritance
transcriptional
across
generations,
whether
it
genetic,
non-genetic,
both
limited.
To
address
knowledge
gap,
we
assessed
expression
targeted
genes
brook
charr
fry
(
Salvelinus
fontinalis)
reared
at
two
different
temperatures
(5
and
8
°C)
produced
by
breeders
exposed
either
cold
warm
thermal
regimes
during
final
gonad
maturation.
Using
a
high-throughput
OpenArray
®
chip,
measured
relative
10
candidate
associated
with
stress.
Parental
temperature
affected
SRY-box
transcription
factor
2,
gene
neurogenesis,
Cholecystokinin
neuropeptide
Y
genes,
appetite
regulation,
regardless
offspring-rearing
temperature.
Additive
maternal,
paternal
effects
were
low,
absence
genotype
×
interactions
indicating
that
factors
may
be
more
important
shaping
expression.
Philosophical Transactions of the Royal Society B Biological Sciences,
Journal Year:
2024,
Volume and Issue:
379(1898)
Published: Feb. 5, 2024
Hormones
regulate
most
physiological
functions
and
life
history
from
embryonic
development
to
reproduction.
In
addition
their
roles
in
growth
development,
hormones
also
mediate
responses
the
abiotic,
social
nutritional
environments.
Hormone
signalling
is
responsive
environmental
changes
adjust
phenotypes
prevailing
conditions.
Both
hormone
levels
receptor
densities
can
change
provide
a
flexible
system
of
regulation.
Endocrine
flexibility
connects
environment
organismal
function,
it
central
understanding
impacts
effect
on
individuals
populations.
may
act
as
'sensor'
link
signals
epigenetic
processes
thereby
phenotypic
plasticity
within
across
generations.
Many
parameters
are
now
changing
unprecedented
ways
result
human
activity.
The
knowledge
base
organism-environmental
interactions
was
established
environments
that
differ
many
current
conditions
ongoing
impacts.
It
an
urgent
contemporary
challenge
understand
how
evolved
endocrine
will
modulate
response
anthropogenic
including
climate
change,
light-at-night
chemical
pollution.
play
role
ecology,
integration
into
conservation
lead
more
effective
outcomes.
This
article
part
theme
issue
'Endocrine
variation:
conceptual
approaches
recent
developments'.
