International Journal of Aquaculture,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Jan. 1, 2024
Cyclopoid
copepods
(
Thermocyclop
sp.)
have
the
nutritional
attributes
of
an
ideal
diet
for
fish
larvae.
However,
long-term
production
and
availability
feeding
larval
in
hatcheries
remain
a
challenge.
The
present
study
investigated
effect
density
temperature
on
survival
fatty
acid
profiles
sp. at
densities:
1
000,
3
5
000
individuals/L
temperatures:
4 °C,
8 °C,
12
°C.
A
log-rank
test
showed
significant
difference
between
percentage
12 °C
4
°C
P
<0.001)
significantly
higher
at
than
<0.001).
Generally,
saturated
acids
(SFAs)
were
dominant
compared
to
monounsaturated
(MUFAs)
polyunsaturated
(PUFAs).
For
essential
acids,
no
differences
observed
storage
temperatures
7th
14th
days
experiment.
results
demonstrated
that
least
50%
rate
is
obtained
when
these
organisms
are
stored
with
14
days,
changes
profiles.
Further
studies
necessary
determine
increased
conditions,
perhaps
aeration,
time.
African Journal of Ecology,
Journal Year:
2024,
Volume and Issue:
62(2)
Published: Feb. 1, 2024
Abstract
The
Manyara
tilapia
(
Oreochromis
amphimelas
),
native
to
the
Saline
Rift
Valley
Lakes
(SRVLs)
in
north‐central
Tanzania,
has
recently
experienced
population
declines
mainly
due
overfishing
and
severe
droughts.
This,
combined
with
introduction
of
Nile
O.
niloticus
which
poses
a
risk
hybridisation,
could
potentially
erode
essential
genetic
traits
necessary
for
their
survival.
To
address
these
concerns,
our
study
analysed
partial
cytochrome
oxidase
subunit
I
sequences
(627
base
pairs)
from
139
79
specimens
collected
SRVLs
test
two
hypotheses:
(i)
whether
there
is
no
transfer
mitochondrial
DNA
between
species,
(ii)
populations
have
remained
genetically
connected
despite
reported
declines.
results
revealed
six
distinct
haplotypes
three
tilapia.
These
formed
separate
clusters
each
shared
or
closely
related
haplotypes,
indicating
limited
them.
Additionally,
we
found
evidence
restricted
connectivity
among
SRVLs,
Eyasi
displaying
exchange
themselves
those
other
SRVLs.
Our
findings
highlight
importance
sustained
conservation
efforts
protected
areas
around
Lake
safeguard
unique
lakes.
However,
suggests
that
initiatives
may
impact
on
Thus,
future
should
prioritise
stocks
Kindai,
Singida
Sulunga,
focusing
protecting
fish
refugia,
particularly
rivers
lakes,
serve
as
critical
habitats
during
dry
season
important
reservoirs
replenishing
populations.
Aquaculture Fish and Fisheries,
Journal Year:
2025,
Volume and Issue:
5(2)
Published: March 6, 2025
ABSTRACT
Lake
Jipe,
a
shared
resource
at
the
Kenya‐Tanzania
border,
has
experienced
significant
fish
introductions
impacting
its
diversity.
Despite
these
changes,
variations
in
morphometric
characters
of
lake
have
not
been
documented
following
establishment
non‐native
Oreochromis
species.
To
address
this,
present
study
assessed
morphological
differences
niloticus
,
jipe
and
esculentus
Jipe
using
traits
to
improve
species
identification
for
ease
fisheries
management
conservation
lake.
These
three
are
known
share
overlapping
which
makes
their
differentiation
challenging.
Using
Image
Analysis
ImageJ
software
version
1.54i
statistical
analysis
R
Version
4.3,
hypothesized
there
were
no
characteristics
Welch's
ANOVA
revealed
statistically
correlations
(
p
<
0.05)
consistent
all
species,
with
standard
length
dorsal
having
highest
degree
positive
association
total
length,
r
>
0.8
across
Correlations
weaker
between
like
caudal
(CL)
head
(HL),
0.5.
All
exhibited
negative
allometric
growth
pattern
b
3)
suggesting
faster
than
weight.
This
important
implications
by
guiding
size‐based
harvesting
strategies
sustainability.
PCA
two
principal
components,
(PC1
=
75.8%,
PC2
10.4%)
contributed
significantly
observed
variance
TL
TW.
discriminated
body
weight
being
most
distinctive
measurements.
Cluster
dendrograms
displayed
site‐specific
grouping
mixed
groupings
indicative
potential
hybridization
events,
especially
where
distribution
overlaps.
underscores
importance
further
research
confirm
identity
admixture
genetic
analyses.
By
refining
distinguishing
traits,
this
contributes
improved
monitoring
populations
Jipe.
African Journal of Ecology,
Journal Year:
2024,
Volume and Issue:
62(3)
Published: Sept. 1, 2024
ABSTRACT
Fish
provide
food
and
income
opportunities
for
millions
of
people
in
Lake
Nyasa,
also
known
as
Malawi
Niassa
Mozambique.
Oreochromis
karongae
(Trewavas,
1941),
which
is
native
to
Malombe
the
Shire
River,
at
verge
extinction
has
been
listed
critically
endangered
species
by
International
Union
Conservation
Nature
(IUCN),
primarily
due
overfishing.
Using
632
bp
partial
mitochondrial
cytochrome
oxidase
subunit
I
(COI)
sequences
from
115
samples,
this
work
aims
assess
population
genetic
status
demographic
history
better
manage
advance
its
conservation.
The
analysis
molecular
variance
(AMOVA)
revealed
a
low
non‐significant
differentiation
index
across
populations
under
study
(ΦST
=
0.003,
p
0.278),
indicating
lack
structure.
Phylogenetic
analysis,
grouped
together
all
COI
haplotypes
O.
six
sampled
sites.
Nonetheless,
results
showed
signs
expansion
historic
bottleneck,
consistent
with
most
data
Western
Indian
Ocean
Fauna.
findings
could
be
used
improve
management
conservation
strategies
Nyasa.
Aquaculture Fish and Fisheries,
Journal Year:
2023,
Volume and Issue:
4(1)
Published: Dec. 4, 2023
Abstract
Lake
Victoria
is
the
second‐largest
freshwater
lake
in
world,
with
a
surface
area
of
68,800
km
2
.
The
rich
natural
resources
that
are
essential
to
local
economy
and
livelihoods.
However,
International
Union
for
Conservation
Nature
(IUCN)
ranks
76%
species
endemic
Basin
as
threatened
extinction.
biodiversity
richness
still
diminishing,
risk
extinction
increasing.
Many
yet
be
identified,
thus
number
exceeds
what
currently
known.
Furthermore,
home
found
nowhere
else
on
planet,
but
its
protection
never
given
attention
it
needs.
Genetic
diversity
loss
harmful
future
populations
influences
sustainability
ecosystem.
decline
Victoria's
primarily
attributed
various
pressing
issues,
including
water
pollution,
invasive
species,
climate
change,
overexploitation
challenges
stemming
from
high
human
population
density.
These
problems
exacerbated
by
inadequate
regulatory
enforcement
lack
comprehensive
data
information
inform
guide
conservation
efforts.
If
these
factors
not
addressed,
they
may
have
detrimental
impact
Biodiversity.
This
article
aims
document
main
threats
aquatic
well
potential
management
strategies
preventing
further
losses
Victoria.
study
recommends
reviewing,
bolstering
reinforcing
rules
regulations
governing
extraction,
accessibility
discharge
nutrients
into
lake.
national
governments
should
work
governments,
non‐governmental
organizations
people
safeguard
conserve
lake's
biodiversity.
riparian
nations
also
reserve
funds
each
fiscal
year
specifically
research
would
effective
measures
prevent
