Impact and size selectivity of fishing gears used in estuarine crab fisheries
Fisheries Research,
Год журнала:
2025,
Номер
282, С. 107284 - 107284
Опубликована: Янв. 24, 2025
Язык: Английский
Intraspecific variation in reproductive traits and embryo elemental composition of the crab Hemigrapsus crenulatus (Milne Edwards, 1837) across fluctuating coastal environments along Chilean coasts
Marine Environmental Research,
Год журнала:
2023,
Номер
188, С. 106023 - 106023
Опубликована: Май 22, 2023
Язык: Английский
Macro and microscopic maturation stage key of green crab (Carcinus maenas, Linnaeus 1758): Reproductive cycle and differences among estuarine systems
Fisheries Research,
Год журнала:
2023,
Номер
268, С. 106828 - 106828
Опубликована: Сен. 6, 2023
Gonadal
histology
is
a
helpful
tool
to
validate
species'
macroscopic
maturity
stages
in
fisheries
biology.
Regardless
of
the
many
studies
on
Carcinus
maenas,
there
are
still
few
concerning
gonads
tissue
and
description
stages.
In
Portugal,
information
regarding
this
biology
help
support
regulation
crab
fisheries,
including
minimum
landing
size,
has
not
yet
been
defined.
work,
macro
microscopic
characteristics
reproductive
cycle
C.
oogenesis,
spermatogenesis
development
along
Portuguese
coast
described,
new
scale
based
histological
analyses
suggested.
During
2019
2020,
adult
maenas
(both
males
females)
were
collected
from
Ria
de
Aveiro
estuary,
Rio
Sado
Formosa
lagoon,
respectively,
North,
Center,
South
Portugal.
No-significant
differences
(P
>
0.05)
observed
carapace
width
individual
weight
between
all
systems.
Significant
<
gonad
weight,
gonadosomatic
index,
Fulton's
condition
index
estuary
lagoon.
Furthermore,
significant
oocyte
diameter
northern
southernmost
locations
suggest
geographic
variation
related
local
environmental
conditions
each
system.
Principal
component
analysis
(PCA)
revealed
stage
an
association,
similar
morphometry
Formosa.
Temperature
was
correlated
both
From
criteria,
it
that
females
previously
classified
within
late
2
should
be
considered
mature,
so
classification
change
current
ovary's
developmental
proposed.
These
findings
can
allow
researchers
reclassify
estimations
ogives
fishery.
The
proposed
validated
by
used
elsewhere.
Язык: Английский
Short food chains, highly diverse and complex food web networks in coastal lagoons
Food Webs,
Год журнала:
2024,
Номер
38, С. e00341 - e00341
Опубликована: Фев. 25, 2024
Shallow
semi-enclosed
coastal
lagoons
are
recognized
as
important
biodiversity
hotspots
and
nursery
areas
for
many
organisms.
However,
the
topology
of
complex
food
web
networks
therein
has
never
been
studied.
Highly
defined
were
assembled
Ria
de
Aveiro,
Alvor
Formosa.
Their
structural
network
properties
analysed
compared
to
those
large
open
estuaries,
small
intermittent
well
other
marine
ecosystems.
The
main
conclusion
was
that
these
dominated
by
intermediate
species
like
estuarine
systems,
however
they
present
more
trophic
(higher
connectance)
than
even
though
having
shorter
chains.
They
also
have
lower
mean
path
length
between
pairs
species.
Shorter
chain
means
disturbance
is
likely
travel
from
basal
top
likewise
bottom
web,
while
low
implies
a
higher
likelihood
disruption
one
affects
any
These
fragilities
may
be
somewhat
counterbalanced
high
connectance
networks.
most
connected
(with
highest
degree
=
number
links
at
node)
in
crab
shrimp
non-indigenous
blue
appears
among
5
commercial
Sparid
fishes
play
particularly
roles
both
highly
generalist
predators.
Top
mostly
birds.
10
with
predators
all
amphipods
encompass
insects,
crabs,
gastropods,
Formosa
exception
polychaete.
particular
inherent
potential
fragility
lagoon
webs
should
taken
into
account
when
designing
environmental
management
plans.
Язык: Английский
Biological traits and population dynamics for sustainable harvesting of Carcinus maenas
Fisheries Research,
Год журнала:
2024,
Номер
281, С. 107243 - 107243
Опубликована: Дек. 3, 2024
Язык: Английский
Sustainable Harvesting Alone Cannot Prevent Decline of the Green Crab Fishery in Portugal
Fisheries Management and Ecology,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 9, 2024
ABSTRACT
Estuarine
fisheries
are
of
high
regional
socio‐economic
importance
worldwide,
by
providing
an
important
livelihood
for
many
families.
The
Portuguese
green
crab
(
Carcinus
maenas
)
fishery
was
assessed
using
a
assessment
to
understand
the
and
stock
analysis
determine
exploitation
status
during
1960–2020.
Fisher
knowledge
revealed
that
fishing
family
affair
provided
hundreds
families
directly
targeting
crabs,
with
catches
exported
Spain
1960–1990s,
in
later
years,
demand
increased
as
bait
octopus
fishing.
Despite
its
importance,
regulated
without
scientific
basis
economic
value
crabs
remained
similar
through
time.
Annual
landings
never
exceeded
sustainable
catch
rates,
but
engagement
declined
due
low
compared
other
regulatory
hurdles.
Consequently,
number
fishermen
20–30
elderly
men
on
largest
estuaries,
currently
verge
extinction.
Fishers
pointed
reduction
minimum
landing
size
enforcement
crab‐specific
trap
regulations
ways
avert
decline.
Such
changes
would
stimulate
recruitment
new
fishers,
while
reducing
pressure
estuarine
resources
diversification.
Язык: Английский
Implications of Warming on the Morphometric and Reproductive Traits of the Green Crab, Carcinus maenas
Fishes,
Год журнала:
2023,
Номер
8(10), С. 485 - 485
Опубликована: Сен. 27, 2023
Understanding
the
relationship
between
environmental
temperature
and
biological
traits
of
organisms
is
fundamental
to
inferring
potential
impacts
climate
change.
In
case
marine
poikilotherm
species,
seawater
one
main
driving
forces
processes,
with
consequences
at
higher
levels
organization
such
as
population
ecosystem.
this
study,
we
analysed
differences
in
maximum
carapace
width
(CWmax),
size
maturation,
relative
duration
reproductive
season
for
green
crab
(Carcinus
maenas)
along
a
gradient.
An
extensive
review
bibliographic
data
was
performed
on
studies
published
1962
2020,
gathering
C.
maenas
from
55
different
populations,
spread
over
20
degrees
latitude
14.2
°C
sea
surface
(SST).
addition,
were
collected
five
lagoons
estuaries
continental
Portuguese
coast.
The
average
SST
CWmax,
age
reduction
egg
bearing
understand
role
variation
these
characteristics
across
latitudinal
There
significant
CWmax
males
CW
females
respectively.
results
extrapolate
each
local
projected
increase
caused
by
change
suggest
an
effect
morphometric
regions.
These
changes
comprise
overall
body
size,
enlargement
season,
shortening
larval
developmental
time,
decrease
crabs
maturation.
Secondary
fecundity
connectivity
populations
are
discussed.
Язык: Английский
Coastal Countercurrents Increase Propagule Pressure of an Aquatic Invasive Species to an Area Where Previous Introductions Failed
Estuaries and Coasts,
Год журнала:
2022,
Номер
45(8), С. 2504 - 2518
Опубликована: Июнь 9, 2022
Язык: Английский
Climate change and multiple stressors
Elsevier eBooks,
Год журнала:
2023,
Номер
unknown, С. 261 - 283
Опубликована: Авг. 25, 2023
Язык: Английский
Reproductive traits of the African mud crab (Panopeus africanus) on the South Portuguese coast
Regional Studies in Marine Science,
Год журнала:
2023,
Номер
69, С. 103339 - 103339
Опубликована: Дек. 19, 2023
Species
with
high
economic
relevance
are
widely
studied
in
contrast
low
species
such
as
Panopeus
africanus,
a
small
crab
wide
distribution
along
the
eastern
Atlantic
coast,
which
remains
poorly
regarding
to
biological
and
ecological
issues.
Knowledge
of
reproductive
patterns
is
essential
understand
populations
dynamics
life-cycle
traits.
The
main
objective
present
research
was
study
P.
africanus.
population
size
structure,
maturation
stages
gametogenic
development
aspect,
at
maturation,
periods
morphometric–fecundity
relationships
africanus
southern
Portuguese
coast
(Ria
Formosa)
analysed.
Crabs
were
sampled
monthly,
from
January
2019
December
2021,
traps
hand
collected.
crab's
carapace
width
(CW)
ranged
between
7
52
mm,
it
observed
that
smaller
larger
CW
classes,
proportion
males
higher,
however
intermediate
classes
sex
ratio
near
1:1.
gonads
characterized
based
on
histological
analysis.
Males
presented
four
maturity
developmental
where
two
immature
mature.
Females
six
stages,
immature,
Regardless
sex,
mean
20
mm
CW.
A
percentage
mature
individuals
throughout
year
however,
colder
months
lower.
Additionally,
ovigerous
females
only
warmer
months,
pointing
short
breeding
period
occurring
months.
Fecundity
12368
84140
eggs/female,
following
positive
correlation
CW/egg
number.
These
novel
results
allowed
shed
light
inhabiting
contributing
also
better
understanding
basic
biology
this
populations.
Язык: Английский