Dictionary of ichthyology. 2009.
Fish ladder — Fishways, most commonly called fish ladders but also known as fish passes and in Australia also referred to as fish steps, are structures on or around artificial barriers (such as dams and weirs) to facilitate diadromous fishes natural migration … Wikipedia
DeNiel fishway — a chute with lateral baffles that reduce the water s energy and leave a clear passage for fish to swim over the low barrier. There are no resting areas although pools may be provided for this purpose or to reduce flow velocity. See also pool and… … Dictionary of ichthyology
pool-and-weir ladder — a series of small dams making pools of regular length in a long, sloping channel for fish to travel around a dam. Fish jump from pool to pool in the ladder. See also rock ramp fishway, vertical slot fish passage and DeNiel fishway … Dictionary of ichthyology
rock-ramp fishway — a structure allowing fish to pass a barrier. Large rocks and timbers are used to build pools and small falls that mimic natural structures. This fishway only works over short distances because of the length of the channel needed for the ladder.… … Dictionary of ichthyology
Recurring enemies in The Legend of Zelda series — This article describes several types of fictional enemy creatures encountered in The Legend of Zelda series of video games. While many enemies can be killed solely with Link s sword, others require the use of specific items to eliminate.[1] In… … Wikipedia
United States — a republic in the N Western Hemisphere comprising 48 conterminous states, the District of Columbia, and Alaska in North America, and Hawaii in the N Pacific. 267,954,767; conterminous United States, 3,022,387 sq. mi. (7,827,982 sq. km); with… … Universalium
tunnels and underground excavations — ▪ engineering Introduction Great tunnels of the world Great tunnels of the worldhorizontal underground passageway produced by excavation or occasionally by nature s action in dissolving a soluble rock, such as limestone. A vertical opening … Universalium
japan — japanner, n. /jeuh pan /, n., adj., v., japanned, japanning. n. 1. any of various hard, durable, black varnishes, originally from Japan, for coating wood, metal, or other surfaces. 2. work varnished and figured in the Japanese manner. 3. Japans,… … Universalium
Japan — /jeuh pan /, n. 1. a constitutional monarchy on a chain of islands off the E coast of Asia: main islands, Hokkaido, Honshu, Kyushu, and Shikoku. 125,716,637; 141,529 sq. mi. (366,560 sq. km). Cap.: Tokyo. Japanese, Nihon, Nippon. 2. Sea of, the… … Universalium
hand tool — any tool or implement designed for manual operation. * * * Introduction any of the implements used by craftsmen in manual operations, such as chopping, chiseling, sawing, filing, or forging. Complementary tools, often needed as auxiliaries to… … Universalium
