Fishionary

A blog about fish words!

By Abigail Lynch

A blog about fish words!

Search Results for: overfishing

Overfishing, overfished

September 19, 2014 by abby Leave a Comment

The terms overfishing and overfished are confusing because they address a similar subject.  The difference between the two terms is subtle but significant. Overfishing refers to the current fishing rate which results in a higher harvest, or fishing mortality rate, than maximum sustainable yield (the maximum harvest level without negatively impacting the sustainability of the … [Read more…]

Posted in: O Tagged: maximum sustainable yield, overfished, overfishing

Population dynamics

March 30, 2018 by abby

Fish population dynamics is the study of change in a fish population over time.  Fundamentally, a population size after some time interval equates to the population size before that interval plus births (i.e., recruitment) and immigration and minus mortality and emigration.  Many fish populations follow a logistic pattern of density-dependent growth.  Beginning with a population … [Read more…]

Posted in: P Tagged: maximum sustainable yield, MSY, overfishing

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

Maxium sustainable yield (MSY)

January 26, 2018 by abby

Maximum sustainable yield (MSY) is a classic concept from fish population dynamics.  It operates under the assumption that populations have a carrying capacity, or equilibrium size, where the the resources available match the population requirements and if individuals are removed from the population, they will be replaced (i.e., are renewable).  When harvest removes a portion … [Read more…]

Posted in: M Tagged: carrying capacity, Magnuson-Stevens Act, MSY, overfished, overfishing, population dynamics, renewable resources, sustainable harvest

Bycatch

July 18, 2014 by abby Leave a Comment

Bycatch is non-target catch within any fishery.  Bycatch can be either different species from the target of the fishery or individuals from the target species, generally juveniles, which are not of a marketable size.  Most bycatch is tossed back because it is illegal to possess or it has no commercial value.  In certain fisheries, however, … [Read more…]

Posted in: B Tagged: BRD, bycatch, TED

Promiscuous

February 19, 2014 by admin Leave a Comment

Promiscuous is a mating system where both sexes have multiple partners during the breeding system. In fishes, this is the most common mating system. Breeders make little or no mate choice and spawn with multiple partners, either sequentially or at the same time. Breeding aggregations of promiscuous spawners can make some fish species particularly vulnerable to fishing. The fish … [Read more…]

Posted in: P Tagged: Promiscuous

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