chesapeake bay: an introduction to an ecosystem section 4: communities ii-1e4: swimmers

Chesapeake Bay:An Introduction to an Ecosystem

Section 4: CommunitiesII-1E4: Swimmers

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Identify the fish

Phytoplankton

Hint – word bank Answer Next Slide

II-1E4-1

A

DC

B

EBluefishStriped KillifishBay AnchovyWeakfishStriped Bass

D. BluefishC. Striped KillifishA. Bay AnchovyB. WeakfishE. Striped Bass

Swimmers comprise the _____________ community whose organisms can control and direct their movements. This group includes fish, some crustaceans and other invertebrates.

Starts with n

nekton

Hint Answer Next Slide

II-1E4-2

Approximately ______ species of fish can be found in the Chesapeake Bay.

350475538780

350

Hint – multiple choice Answer Next Slide

II-1E4-3

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.

No hint

True

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II-1E4-4

Smaller resident species, such as killifish, normally occur in shallow water where they feed on a variety of ____________.

No hint

invertebrates

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II-1E4-5

What is the most abundant fish in the Bay?

Initials b.a.

bay anchovy

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II-1E4-6

Bay anchovies feed primarily upon _____________. Adult anchovies also

may consume _____________, ____________ and some

_______________.

Initials z, l.f., c.l., & b.s.

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II-1E4-7

larval fishzooplankton

crab larvaebenthic species

In turn, the bay anchovy is a major food source for predatory fish like _____________, _____________ and ________________, as well as some birds and mammals.

No hint

Hint Answer Next Slide

II-1E4-8

weakfishstriped bass bluefish

Migratory fish fall into two categories: ______________, which spawn in the

Bay or its tributaries, and ___________ fish, which spawn in the ocean.

Makes me think of mice & what eats them

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II-1E4-9

catadromousanadromous

Anadromous fish migrate varying distances to spawn in freshwater and can

even be considered Bay residents. For instance, during the spawning season, ______________________ 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

yellow and white perch

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II-1E4-10

_______________ 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.

Striped bass

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II-1E4-11

____________ and ____________ are truly anadromous, traveling from the

ocean to freshwater to spawn and returning to the ocean to feed.

S & h

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II-1E4-12

herringShad

______________ are the only catadromous species in the Bay.

E.

Eels

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II-1E4-13

Although they live in the Bay for long periods, eels eventually migrate to the

__________________ in the central North Atlantic to spawn

S. S.

Sargasso Sea

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II-1E4-14

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.

C, D, M, W & S

1. Croaker2. Drum3. Menhaden4. Weakfish5. Spot

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II-1E4-15

The abundance of ________________ supports a commercial fishing industry and provides food for predatory fish and birds.

Not women

menhaden

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II-1E4-16

___________ enter the Bay only as young adults or mature fish.

A color fish

Bluefish

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II-1E4-17

Besides fish, _________________ and _______________ may be part of the nekton community.

No hint

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II-1E4-18

invertebratescrustaceans

Name five larger animals that enter the Bay though two of the five only occasionally.

No hint

1. Sharks2. Rays3. sea turtles4. marine dolphins5. whales

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II-1E4-19

Why is the blue crab is difficult to place in any one community?

No hint

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.

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II-1E4-20

The first life stage of a blue crab, called the ___________, is microscopic and

lives a planktonic free-floating existence.

Starts with Z

zoea

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II-1E4-21

After several molts, the zoea reaches its second larval stage: the ___________. Another molt and a tiny crab form is

apparent.

No hint

megalops

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II-1E4-22

How do crabs use the bottom of the Bay?

No hint

Both juvenile and adult blue crabs forage on the bottom and hibernate there

through the winter.

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II-1E4-23

Describe the movement & distribution of crabs though the seasons.

No hint

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.

Hint Answer Next Slide

II-1E4-24

A C

B

Label the life stages of a blue crab

Immature crabMegalopsZoea

Hint – word bank Answer Last Slide

II-1E4-25

C. Immature crabB. MegalopsA. Zoea