Fishionary

A blog about fish words!

By Abigail Lynch

A blog about fish words!

E

Exclusive Economic Zone (EEZ)

February 23, 2018 by abby

An Exclusive Economic Zone (EEZ), as defined by the United Nations Convention on the Law of the Sea, is a 200 nautical mile jurisdiction granted to coastal nations for “sovereign rights for the purpose of exploring and exploiting, conserving and managing the natural resources, whether living or non-living, of the waters superjacent to the seabed and of … [Read more…]

Posted in: E Tagged: EEZ, fisheries management, Law of the Sea, Magnuson-Stevens Act, overfishing

Escapement

October 20, 2017 by abby

Escapement is a term used in salmon management to mean, quite simply, how many salmon are able to “escape” premature death and complete their full life cycle.  These escapees have run the gauntlet of natural mortality, recreational fishing, commercial fishing, and other life-threatening episodes for the opportunity to spawn in freshwater.  Escapement is estimated by … [Read more…]

Posted in: E Tagged: fish surveys, maximum sustainable yield, Pacific Salmon

Endemic species

December 16, 2016 by abby

A fish species is considered endemic to a location if that is the only place it occurs naturally.  It may have evolved in that region or over time has become so adapted to that specific environment that it cannot survive elsewhere.  For example, Devil’s Hole Pupfish (Cyprinodon diabolis) is only found in Devil’s Hole, Nevada.  If a … [Read more…]

Posted in: E Tagged: endemic, invasive, native, non-native, pupfish, t & e

Elasmobranch

November 20, 2015 by abby

Elasmobranchs, including sharks, rays, and sawfishes, belong to the taxonomic subclass of cartilaginous fish Elasmobranchii.  Like most chondrichthyes, they have exposed gills, no swim bladder, internal fertilization, and placoid denticles.  They differ from the other subclass, chimaera (subclass: Holocephali), in that they have rigid dorsal fins, placoid denticles cover most of their bodies, and they … [Read more…]

Posted in: E Tagged: chondrichthyes, elasmobranchs, rays, sharks

Eurytherm

May 22, 2015 by abby

In contrast to stenotherms, eurythermic fish can function at a wide range of water temperatures.  They are often, but not necessarily, ectotherms.  Desert Pupfish (Cyprinodon macularius), for example, can function in ambient temperatures ranging from 4 to 45 degrees Celsius.  This thermoregulatory strategy requires that organs, enzymes, and metabolic processes can operate at varying environmental temperatures.  

Posted in: E Tagged: eurytherm, eurythermic, stenotherm, temperature, thermoregulation

Ectotherm

April 24, 2015 by abby

Unlike endotherms which can metabolically control their own body temperature, ectotherms rely upon environmental temperatures for thermoregulation.  Most fish are ectotherms.  Ectothermy can be metabolically more efficient than endothermy because organisms do not have to expend any energy to self-regulate their body temperatures.  However, they are at the mercy of their environment more than endotherms because they … [Read more…]

Posted in: E Tagged: ectotherm, ectothermic, poikilotherm, stenotherm, temperature, thermoregulation

Endotherm

April 10, 2015 by abby

Unlike ectotherms, which rely upon environmental temperatures, endotherms are able to metabolically control their body temperature.  This thermoregulatory strategy is rare among fish but is present in tunas and some sharks, including the Great White Shark (Carcharodon carcharias) and Shortfin Mako Shark (Isurus oxyrinchus).  Endothermic tunas and sharks use a network of capillaries in their swimming muscles, … [Read more…]

Posted in: E Tagged: endotherm, endothermic, temperature, thermoregulation

Electrofishing

November 21, 2014 by abby Leave a Comment

Electrofishing is a survey tool used to estimate species composition, fish abundance, and fish density in freshwater systems using an electrical current.  An electroshocker creates a flow of current between an anode (i.e., ring on a backpack models) and cathode (i.e., rat tail on backpack models) that stuns fish that cross the electric field.  Stunning … [Read more…]

Posted in: E Tagged: anode, cathode, depletion electrofishing, electrofishing, electroshocker

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