Transcript II-1E4-1 - WordPress.com

Chesapeake Bay:
An Introduction to an Ecosystem
Section 4: Communities
II-1E4: Swimmers
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II-1E4-1
Identify the fish
A
B
D.
C.
A.
B.
E.
Bluefish
Striped Killifish
Bay Anchovy
Weakfish
Striped Bass
C
Phytoplankton
E
Bluefish
Striped Killifish
Bay Anchovy
Weakfish
Striped Bass
Hint – word bank
D
Answer
Next Slide
II-1E4-2
Swimmers comprise the _____________
nekton
community whose organisms can control
and direct their movements. This group
includes fish, some crustaceans and
other invertebrates.
Starts with n
Hint
Answer
Next Slide
II-1E4-3
Approximately ______
350 species of fish
can be found in the Chesapeake Bay.
350
475
538
780
Hint – multiple choice
Answer
Next Slide
II-1E4-4
True or False: The resident fish in the
Bay tend to be smaller in size and do not
travel the long distances that migratory
species do.
True
No hint
Hint
Answer
Next Slide
II-1E4-5
Smaller resident species, such as killifish,
normally occur in shallow water where
they feed on a variety of ____________.
invertebrates
No hint
Hint
Answer
Next Slide
II-1E4-6
What is the most abundant fish in the
Bay?
bay anchovy
Initials b.a.
Hint
Answer
Next Slide
II-1E4-7
Bay anchovies feed primarily upon
zooplankton Adult anchovies also
_____________.
larval fish
may consume _____________,
crab larvae and some
____________
_______________.
benthic species
Initials z, l.f., c.l., & b.s.
Hint
Answer
Next Slide
II-1E4-8
In turn, the bay anchovy is a major food
source for predatory fish like
_____________,
and
striped bass _____________
bluefish
weakfish
________________,
as well as some
birds and mammals.
No hint
Hint
Answer
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II-1E4-9
Migratory fish fall into two categories:
anadromous which spawn in the
______________,
catadromous
Bay or its tributaries, and ___________
fish, which spawn in the ocean.
Makes me think of
mice & what eats them
Hint
Answer
Next Slide
II-1E4-10
Anadromous fish migrate varying
distances to spawn in freshwater and can
even be considered Bay residents. For
instance, during the spawning season,
______________________
yellow and white perch travel short
distances from the brackish water of the
middle Bay to freshwater areas of the
upper Bay or tributaries.
2 colors of a fish that
reminds me of a bird group
Hint
Answer
Next Slide
II-1E4-11
_______________
Striped bass
also spawn in the tidal
freshwater areas of the Bay and major
tributaries. Some remain in the
Chesapeake to feed while others migrate
to ocean waters.
S. B.
Hint
Answer
Next Slide
II-1E4-12
herring
Shad
____________
and ____________
are
truly anadromous, traveling from the
ocean to freshwater to spawn and
returning to the ocean to feed.
S&h
Hint
Answer
Next Slide
II-1E4-13
______________
Eels
are the only
catadromous species in the Bay.
E.
Hint
Answer
Next Slide
II-1E4-14
Although they live in the Bay for long
periods, eels eventually migrate to the
Sargasso Sea
__________________
in the central
North Atlantic to spawn
S. S.
Hint
Answer
Next Slide
II-1E4-15
Name five that fish utilize the Bay strictly
for feeding, journeying into the Bay while
still in their larval stage to take
advantage of the rich supply of food.
1. Croaker
2. Drum
3. Menhaden
4. Weakfish
5. Spot
C, D, M, W & S
Hint
Answer
Next Slide
II-1E4-16
The abundance of ________________
supports a commercial fishing industry
and provides food for predatory fish and
birds.
menhaden
Not women
Hint
Answer
Next Slide
II-1E4-17
___________ enter the Bay only as
young adults or mature fish.
Bluefish
A color fish
Hint
Answer
Next Slide
II-1E4-18
Besides fish, _________________
crustaceans
and
_______________
invertebrates may be part of the
nekton community.
No hint
Hint
Answer
Next Slide
II-1E4-19
Name five larger animals that enter the
Bay though two of the five only
occasionally.
1. Sharks
2. Rays
3. sea turtles
4. marine dolphins
5. whales
No hint
Hint
Answer
Next Slide
II-1E4-20
Why is the blue crab is difficult to place
in any one community?
because it requires a variety of aquatic
habitats, from the mouth of the Bay to fresher
rivers and creeks, in order to complete its life
cycle. Throughout the year, crabs may burrow
into the Bay bottom, shed and mate in shallow
waters and beds of bay grasses or swim freely
in open water.
No hint
Hint
Answer
Next Slide
II-1E4-21
The first life stage of a blue crab, called
the ___________,
is microscopic and
zoea
lives a planktonic free-floating existence.
Starts with Z
Hint
Answer
Next Slide
II-1E4-22
After several molts, the zoea reaches its
megalops
second larval stage: the ___________.
Another molt and a tiny crab form is
apparent.
No hint
Hint
Answer
Next Slide
II-1E4-23
How do crabs use the bottom of the Bay?
Both juvenile and adult blue crabs forage
on the bottom and hibernate there
through the winter.
No hint
Hint
Answer
Next Slide
II-1E4-24
Describe the movement & distribution of
crabs though the seasons.
In spring, the crab quickly begins migrating from
the southern part of the Chesapeake to tidal
rivers and northern portions of the Bay. During
the rest of the year, adult blue crabs are
dispersed throughout the Bay, swimming
considerable distances using their powerful
paddle-like back fins.
No hint
Hint
Answer
Next Slide
II-1E4-25
Label the life stages of a blue crab
A
C
B
Immature crab
Megalops
Zoea
Hint – word bank
C. Immature crab
B. Megalops
A. Zoea
Answer
Last Slide