alarm substance
a substance produced in the round or oval alarm substance cells (previously called “clubcells") in the skin of Ostariophysi (Cypriniformes, Siluriformes) and Gonorhynchiformes, and which is released upon injury of the skin. On scenting the alarm substance members of the same species, and to a lesser extent related fishes, exhibit the fright reaction (q.v.). The dispersal of the alarm substance apparently normally acts to warn of the presence of a preying predator. The alarm pheromone is hypoxanthine-3N-oxide comprising a purine skeleton with N-O functional group and sensitive to relatively weak changes in pH. Also called alarm pheromone or Schreckstoff

Dictionary of ichthyology. 2009.

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  • alarm substance — noun chemical given off from the skin of a fish after injury that warns nearby fish of danger …   Wiktionary

  • alarm pheromone — alarm substance …   Dictionary of ichthyology

  • Fire alarm — Fire Fire (f[imac]r), n. [OE. fir, fyr, fur AS. f[=y]r; akin to D. vuur, OS. & OHG. fiur, G. feuer, Icel. f[=y]ri, f[=u]rr, Gr. py^r, and perh. to L. purus pure, E. pure Cf. {Empyrean}, {Pyre}.] 1. The evolution of light and heat in the… …   The Collaborative International Dictionary of English

  • Schreckstoff — alarm substance (a substance produced in the round or oval alarm substance cells (previously called “clubcells ) in the skin of Ostariophysi (Cypriniformes, Siluriformes) and Gonorhynchiformes, and which is released upon injury of the skin. On… …   Dictionary of ichthyology

  • Schreckstoff — In 1938, the Austrian ethologist Karl von Frisch made his first report on the existence of the chemical alarm signal known as Schreckstoff in minnows. An alarm signal is a response produced by an individual, the “sender,” reacting to a hazard… …   Wikipedia

  • Ostariophysi — Temporal range: Early Cretaceous Recent [1] Milkfish, Chanos chanos Scientific classificat …   Wikipedia

  • ostariophysan — ▪ fish Introduction  any of about8,000 species of bony fishes (bony fish) belonging to a group that includes the majority of freshwater fishes throughout the world. Familiar representatives of this group are the minnows (minnow), suckers (sucker) …   Universalium

  • Golden shiner — fish Scientific classification Kingdom: Animalia Phylum …   Wikipedia

  • Pimephales promelas — Ventre pourri Pimeph …   Wikipédia en Français

  • hymenopteran — /huy meuh nop teuhr euhn/, adj. 1. hymenopterous. n. 2. Also, hymenopter. a hymenopterous insect. [1875 80; HYMENOPTER + AN] * * * ▪ insect Introduction   any member of the third largest and perhaps the most beneficial to humans of all insect… …   Universalium

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