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from article Salmon
Chinook salmon (Oncorhynchus tshawytscha). (Photo courtesy of the National Estuarine Research Reserve System, National Marine Fisheries Service, National Oceanic and Atmospheric Administration)
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from article Fisheries ecology
The Atlantic bluefin tuna (Thunnus thynnus) is one of the world's most lucrative fish harvested by commercial fisheries. (Credit: Ugo Montaldo/Shutterstock)
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from article Fisheries ecology
Raceways (artificial channels used in the culturing of aquatic organisms) at Spring Creek National Fish Hatchery, Washington. (Credit: U.S. Fish and Wildlife Service)
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from article Fisheries ecology
Derelict fishing gear left in ocean waters can cause the needless deaths of millions of marine mammals, fish, birds, and invertebrates. (Credit: Joan Drinkwin/U.S. Fish and Wildlife Service)
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from article Salmon farming
Adult Atlantic salmon (Salmo salar). (Credit: William Hartley/U.S. Fish and Wildlife Service)
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from article Salmon farming
Atlantic salmon (Salmo salar) at a pre-smolt stage. (Credit: Edward Peter Steenstra/U.S. Fish and Wildlife Service)
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from article Salmon farming
A congregation of coho salmon (Oncorhynchus kisutch) released from a hatchery. Investigators continue to study the effects of farmed fish on neighboring populations of wild salmonids. (Credit: Salmon Ecology Team/Southwest Fisheries Science Center,…
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from article Prehistoric technology
Elements of stone flaking. (a) Relationship between the core and the flake. (b) Major feature of the ventral or release surface of the flake. (After I. Tattersall, E. Delson, and J. A. Van Couvering, eds., Encyclopedia of Human Evolution and…
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from article Prehistoric technology
Principal techniques of stone-tool manufacture. (a) Hard-hammer, with free-hand percussion. (b) Anvil technique. (c) Bipolar technique. (d) Soft-hammer percussion. (e) Indirect percussion or punch technique. (f) Pressure flaking. (After I.…
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from article Prehistoric technology
Potters from the village of Harappa, Pakistan, display their wares in front of a replica of a two-chambered kiln used by ancient potters in the Indus Valley civilization. (Photo courtesy of R. P. Wright)
