Fisheries science and the striped bass
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Fisheries Science and the Striped Bass. A Classroom Lesson from the Mathematics & Science Center. Striped Bass: A Success Story!. Why? Because of …. Fisheries Science … and then… proper fish management!. Fisheries Science Involves:. Biology/Life Cycle Genetics Ecology

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Fisheries Science and the Striped Bass

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Fisheries science and the striped bass

Fisheries Science and the Striped Bass

A classroom lesson from the mathematics science center

A Classroom Lesson from theMathematics & Science Center

Striped bass a success story

Striped Bass: A Success Story!

Why because of

Why? Because of ….

Fisheries Science …

and then…

proper fish management!

Fisheries science involves

Fisheries Science Involves:

  • Biology/Life Cycle

  • Genetics

  • Ecology

  • Population Studies

  • Taxonomy

  • Fisheries Technology

  • Management ( & politics!)

In the chesapeake bay

In the Chesapeake Bay…

  • Salinity = 0.5 to 32 ppt

  • 50% depth < 20 ft.

  • Temp range = 1 – 30° C

  • Largest U.S. Estuary

  • Oxygen levels vary

  • (O to saturated)

Fish fauna flourish

…Fish Fauna Flourish!

Not many “residents” – most are visitors!

267 species in the bay

Only 32 species are year-round!

Fish their waters

Fish & their Waters…

  • Freshwater (0 – 5 ppt)

  • Estuarine (0.5 to 32 ppt)

  • Marine (> 30 ppt)

  • Anadromous Species of fish–

    Lives in Salt water, spawns in Fresh

The scientific question

The Scientific Question:

How many fish do we have…

...and how many can we catch…

…without harming the fish stock?

A stock assessment

A Stock Assessment

A special type of study of the carrying capacity of an area for a fish population that is “harvested” or managed

  • Fish Biology

  • Fishing Practices

  • Catch Per Unit Effort (CPUE)

Methods of fish science

Methods of Fish Science

Otoliths how old is a fish

Otoliths – How Old is a Fish?

Otolith rings fish age

Otolith Rings = Fish Age

Graphs of fish populations

Graphs of Fish Populations

Fish length graph

Fish Length Graph





Length age

Length = Age

Female Striped Bass…

…is able to reproduce…

… at 4 years old!

Tagging where they go

Tagging – Where they go!

Inserting the tag

Inserting the tag

A tagged fish

A Tagged Fish

Dissections what they eat

Dissections – What they eat

A favorite treat

A Favorite treat!

Prey of the striped bass

Prey of the Striped Bass

Dna fish genetics

DNA – Fish Genetics

Whose eggs

Whose Eggs?

Fisheries science and the striped bass

DNA Patterns of Chesapeake Bay Sportfish











Summer flounder

Southern kingfish

} Spanish mackerel

} Spotted sea trout

} Northern kingfish

} Atlantic croaker

} Cobia

} Black sea bass

Black drum

Silver perch

Striped bass

Red drum




Dna says

DNA Says ---

  • Bass Mitochondrial DNA

  • RFLP, Gel Electrophoresis

  • Pattern for each species

Fishing practices

Fishing Practices

  • Who is doing the fishing…

  • Catch Per Unit Effort (CPUE)

By catch a critical issue

By-catch – A Critical Issue

Keep or release

Keep or Release?

Some major things we ve learned

Some Major Things We’ve Learned…

  • Reduced populations from overfishing INCREASES the effects of natural stresses

  • Acid rain and other chemicals (copper, aluminum) are toxic

  • Fluctuation of water temp. in spawning grounds is most significant natural stress

Maximum sustainable yield

Maximum Sustainable Yield

  • The number of fish we can catch per year and not hurt the stock

  • Usually occurs at ½ of the carrying capacity

  • Not too many fish for competition, but enough for a good spawning stock

The scientific end result

The Scientific End Result

We learn:

What age fish to catch…

How many we can catch and when…

and still not hurt the fish stock!

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