Biology,
Journal Year:
2023,
Volume and Issue:
12(4), P. 490 - 490
Published: March 23, 2023
This
study
estimated
the
effect
of
substituting
fishmeal
completely
with
cottonseed
protein
concentrate
(CPC)
in
diet
sturgeon
(Acipenser
schrenckii)
on
growth,
digestive
physiology,
and
hepatic
gene
expression.
A
control
containing
an
experimental
based
CPC
was
designed.
The
conducted
for
56
days
indoor
recirculating
aquaculture
systems.
results
showed
that
weight
gain,
feed
efficiency,
whole-body
essential
amino
acids
(EAAs)
all
decreased
significantly
group,
while
non-essential
(NEAAs)
serum
transaminase
activity
increased
(p
<
0.05).
enzymes
mid-intestine
reduced
0.05),
liver
histology
revealed
fatty
infiltration
hepatocytes.
transcriptome
upregulation
genes
linked
to
metabolism,
including
steroid
biosynthesis,
pyruvate
acid
biosynthesis.
These
findings
indicate
fully
replacing
harms
A.
schrenckii
growth
physiology.
provides
valuable
data
development
improved
aquafeeds
use
molecular
methods
evaluate
performance
sturgeon.
Comparative Immunology Reports,
Journal Year:
2024,
Volume and Issue:
6, P. 200144 - 200144
Published: April 19, 2024
Columnaris
disease
is
a
prevalent
in
freshwater
environments
caused
by
the
ubiquitous
aquatic
pathogen
Flavobacterium
species.
Adhesion
to
external
mucosal
surfaces
of
fishes
initial
stage
infection,
and
gills
specifically
have
been
identified
as
both
primary
target
release
site
for
this
pathogen.
Demonstrated
here
previous
research,
hybrid
striped
bass
(Morone
chrysops
x
M.
saxatilis),
prominent
United
States
aquaculture
product,
more
susceptible
infection
with
F.
covae
than
maternal
white
(M.
chrysops)
parental
To
further
elucidate
mechanisms
underlying
differences
resistance
between
these
fish
we
examined
gill
gene
expression
profiles
using
RNA
sequencing
at
different
timepoints
after
infection.
Patterns
differential
association
key
enrichment
terms
indicate
effective
immune
response
observed
includes
up-regulation
multiple
cytokines
(IL-1β,
IL-17C,
TNF-α,
G-CSF,
IL-8,
CCL16,
CXCL9),
hepcidin
(HAMP
HAMP2),
ribosomal
subunit
components
(e.g.,
RPL13),
and,
interestingly,
down-regulation
leptin
(LEPA)
during
(1
–
4
h)
stages
Conversely,
same
genes
was
not
detected
until
24
h
indicating
delay
that
ultimately
ineffective
protecting
host
concurrent
onset
mortality
fish.
Collectively,
presented
results
include
several
putative
pathways
candidate
investigation
toward
characterizing
defense
(white
bass)
susceptibility
(hybrid
selective
breeding
efforts
and/or
biotechnological
intervention.
Harmful Algae,
Journal Year:
2022,
Volume and Issue:
118, P. 102310 - 102310
Published: Aug. 22, 2022
Based
on
a
four
year
study
conducted
in
Cowichan
Bay,
Canada,
potential
linkages
between
composition
and
abundance
of
phytoplankton
the
feeding
histopathology
juvenile
salmon
were
noted.
During
two
dense
blooms
(Skeletonema
spp.
Pseudo-nitzschia
spp.),
Chinook
decreased
(n=202,
empty
stomachs
>50%).
All
collected
gills
(n=5)
damaged
following
high
levels
mechanically
harmful
Chaetoceros
convolutus
water
column;
all
livers
showed
signs
pathological
changes
during
Octactis
speculum
bloom.
These
observations
consistent
with
effects
previously
reported
from
farms,
however
this
agreement
must
be
treated
caution
as
it
is
based
limited
number
samples.
We
suggest
that
there
need
for
comprehensive
studies
to
evaluate
role
algae
stressor
wild
fish
coastal
environment.
