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

Fish

Length

(avg.)

Year


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

2,036

1,636

1,018

517/506

396

344

298

220/201

154/134

Bluefish

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

Weakfish

Tautog

Spot


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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