2. Economic Significance of The Sea
• Contains-
• Food
• Raw Materials-Salt, Oil, coal, petroleum,
natural gas -sedimentary rocks,
Magnesium
• Valuable Goods-Precious stones, metals
• Hides-whale, oysters, crab
• Oil-soap, margarine, glycerine, varnish
etc..
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3. Economic Significance of Sea
• Cheapest form of transportation
• < 10% world fish output absorbed in non-
food use-animal feed & fertilizer
• Over 30,000 kind of fish-only a few
hundred of economic and commercial
importance
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4. Types of Fish
• Marine Fisheries-
1) Open Sea-
2) Coastal-
Ex-Cod, Salmon, Halibut, Tuna, Sardines,
Herring, Mackerel
• Fresh Water-
Ex-White Fish, Channel Catfish, Bluegill,
Carp, Eel
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5. Fish Food
• Feed on smaller fish
• Feed on “plankton”- tiny plant-animal found in
sea water
• Develops near coasts-rivers bring variety of
minerals, wastes etc.. Essential for the growth
of plankton.
• Drifts with currents
• Is in abundance where cold-warm water meets
• Depends on vertical sunlight
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6. Production & Distribution
• northern hemisphere accounts for 98%
• 85% of all fish are caught in the temperate
or middle latitudes.
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