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 - PowerPoint PPT PresentationTRANSCRIPT
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Fisheries Science and the Striped Bass
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A Classroom Lesson from theMathematics & Science Center
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Striped Bass: A Success Story!
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Why? Because of ….
Fisheries Science …
and then…
proper fish management!
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Fisheries Science Involves: Biology/Life Cycle Genetics Ecology Population Studies Taxonomy Fisheries Technology Management ( & politics!)
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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)
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…Fish Fauna Flourish!
Not many “residents” – most are visitors!
267 species in the bay
Only 32 species are year-round!
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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
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The Scientific Question:
How many fish do we have…
...and how many can we catch… …without harming the fish stock?
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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)
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Methods of Fish Science
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Otoliths – How Old is a Fish?
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Otolith Rings = Fish Age
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Graphs of Fish Populations
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Fish Length Graph
Fish
Length
(avg.)
Year
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Length = Age
Female Striped Bass…
…is able to reproduce…
… at 4 years old!
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Tagging – Where they go!
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Inserting the tag
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A Tagged Fish
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Dissections – What they eat
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A Favorite treat!
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Prey of the Striped Bass
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DNA – Fish Genetics
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Whose Eggs?
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2,036 1,636 1,018
517/506
396 344 298
220/201
154/134
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DNA Patterns of Chesapeake Bay Sportfish
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DNA Says ---
• Bass Mitochondrial DNA
• RFLP, Gel Electrophoresis
• Pattern for each species
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Fishing Practices Who is doing the
fishing… Catch Per Unit
Effort (CPUE)
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By-catch – A Critical Issue
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Keep or Release?
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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
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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
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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!