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19 Cards in this Set
- Front
- Back
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In 1999 the total harvest for US marine fisheries was 4.4 million metirc tons. What was the total value of this harvest?
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32 Billion
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What is an ANADROMOUS FISH?
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born in freshwater, spends most of life on the sea and returns to freshwater to spawn. Salmon, smelt, shad, striped bass, and sturgeon, CHINOOK which is a salmon
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Sea Lamprey
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invaded great lakes, parasittic, main facotor in introduciton was dev of erie cananl connecting hte hudson with lake erie
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Why was overharvest occured for so many ocean fish stocks?
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Economic, political, and sosical decisions often outweigh biological informatoin
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what is a native freshwater fish of NA, not introduced exoitc?
The river ruff is? |
small mouth bass
exotic from Europe |
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Rotenone
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a crystalline insecticide C23H22O6 obtained from the roots of several tropical plants (as a derris) that is highly toxic to fish but is of low toxicity to warm-blooded animals and is used especially in home gardens
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Eutrophication******
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process wehre bodies of water recieve excess nutrients that stimulate excessiev plant growth
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Creel Limits
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limit to the number of fish you are allowed to catch; one can never possess more than twice the daily creel. daily creel limit run from midnight to midmight
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fish ladders
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aid fish in their migration upstream,
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Genetic Erosion
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loss of geneitc diversity within a species
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Hybrid fish
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(striped bass) must be closely related to do so
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Nitrogen Intoxication
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narcosis; Narcosis results from breathing gases under elevated pressure
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Passive Fishing Gear
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small scale fishing; ancient; static fishing
EX; long line, gill nets, entagling nets, trammel nets, traps and pots |
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active fishing
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trwls and seines
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resident fish
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remain in freshwater and do not migrate; rainbow trout; also shiners and dace
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splash dams
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temp wooden dam used to raise the water level in sreams to float logs downstream
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Translocation
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chromosomal abnormality caused buy rearrangement of parts
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vibert box
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dev in the early 1950 by rishard vibert for stocking streams with throut and salmon eggs
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whirling disease
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Afflicts JUVINILE FISH (fingerlings and fry) and causes skelteal deformation and nuro dmadge, fish whirl foward
Whirling disease is caused by the Myxobolus cerebralis parasite effecting fish like salmon, trout and other similar species |
