fisheries science and the striped bass
Download
Skip this Video
Download Presentation
Fisheries Science and the Striped Bass

Loading in 2 Seconds...

play fullscreen
1 / 32

Fisheries Science and the Striped Bass - PowerPoint PPT Presentation


  • 142 Views
  • Uploaded on

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

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Fisheries Science and the Striped Bass' - carlyn


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
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)
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!

slide25

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)
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!

ad