Fisheries & Aquatic Life,
Journal Year:
2021,
Volume and Issue:
29(3), P. 135 - 147
Published: Sept. 1, 2021
Abstract
In
recent
years,
the
issue
of
spawner
harvesting
has
been
frequently
addressed
by
different
groups
stakeholders
involved
in
exploitation
fish
resources.
The
increasingly
numerous
angling
circles,
which
use
these
resources
recreationally,
question
current
rules
stocking
management
Poland,
and
its
legal
economic
status
become
focus
scientists’
interest.
aim
study
was
to
present
discuss
results
a
questionnaire
survey
managers
owners
lake
fisheries
entities
order
identify
determinants
related
harvesting.
Questionnaires
were
collected
from
total
76
entities,
concerned
1921
lakes
with
area
174,078
ha,
accounts
for
more
than
64%
used
fishing
purposes
Poland.
paper
presents
inter
alia
occupational
characteristics
respondents;
their
positions
on
effect
ecosystem,
environmental
protection,
social
factors;
anglers’
assessments
harvesting;
actual
potential
methods
regulating
this
negative
positive
effects
introduction
prohibition
show
that
respondents
under
generally
do
not
see
need
additional
(except
those
already
place)
regulations
concerning
harvesting,
most
them
notice
adverse
introduction,
but
they
are
also
aware
possible
changes
impact
management.
Hydrobiologia,
Journal Year:
2023,
Volume and Issue:
851(8), P. 2025 - 2040
Published: Dec. 29, 2023
Abstract
Cyanobacterial
blooms
have
a
strong
impact
on
the
food
web
structure,
interactions
and
ecosystem
functioning.
The
aim
of
this
study
was
to
describe
seasonal
changes
in
composition
abundance
heterotrophic
nanoflagellates,
ciliates,
rotifers,
crustaceans
relation
algae
nutrients
shallow
eutrophic
lake
(north-eastern
Poland)
dominated
by
cyanobacteria
exposed
cormorants.
Our
results
showed
that
accounted
for
small
part
total
phytoplankton
(9–40%)
biomass
(10–21%)
were
diatoms
cryptophytes.
All
studied
groups
planktonic
organisms
quite
rich
species
(95
algal,
79
ciliate,
44
rotifer
25
crustacean
species)
relatively
abundant.
Copepods
formed
substantial
(45–83%)
zooplankton
during
all
seasons.
Relatively
low
algal
ratio
(0.8–1.1)
suggests
spring,
summer,
winter
not
sufficient
resources
metazooplankton,
which
supplemented
its
diet
with
protists
(heterotrophic
nanoflagellates
ciliates).
In
cyanobacteria,
(ice-covered
period)
may
be
more
favourable
period
growth
some
algae,
ciliates
rotifers
than
other
seasons
due
decreasing
cyanobacteria.
Fisheries & Aquatic Life,
Journal Year:
2021,
Volume and Issue:
29(3), P. 135 - 147
Published: Sept. 1, 2021
Abstract
In
recent
years,
the
issue
of
spawner
harvesting
has
been
frequently
addressed
by
different
groups
stakeholders
involved
in
exploitation
fish
resources.
The
increasingly
numerous
angling
circles,
which
use
these
resources
recreationally,
question
current
rules
stocking
management
Poland,
and
its
legal
economic
status
become
focus
scientists’
interest.
aim
study
was
to
present
discuss
results
a
questionnaire
survey
managers
owners
lake
fisheries
entities
order
identify
determinants
related
harvesting.
Questionnaires
were
collected
from
total
76
entities,
concerned
1921
lakes
with
area
174,078
ha,
accounts
for
more
than
64%
used
fishing
purposes
Poland.
paper
presents
inter
alia
occupational
characteristics
respondents;
their
positions
on
effect
ecosystem,
environmental
protection,
social
factors;
anglers’
assessments
harvesting;
actual
potential
methods
regulating
this
negative
positive
effects
introduction
prohibition
show
that
respondents
under
generally
do
not
see
need
additional
(except
those
already
place)
regulations
concerning
harvesting,
most
them
notice
adverse
introduction,
but
they
are
also
aware
possible
changes
impact
management.
