optimum yield
(OY)
The yield from a fishery which provides the greatest overall benefit to the nation with particular reference to food production and recreational opportunities; it is based on MSY as modified by economic, social or ecological factors. Precision and Accuracy Precision is the closeness to each other of repeated measurements of the same quantity or object, while accuracy is closeness of a measured or computed value to its true value.
As an illustration, suppose regulations state that fishermen can only land 5,000 lbs. of cod per trip. A fisherman makes 10 trips with the intent to not exceed the 5,000 lbs. limit. Before landing each trip, he estimates that his total catch for each was approximately 5,000 lbs. However, after landing each trip, weigh-in\'s at a dealer showed that every catch was just about 5,500 lbs. The fisherman\'s estimates of his catch were, therefore, precise but not accurate.
Two fictional series of research vessel tows were made in a single stratum. The first series resulted in catches of 61, 55, 60, 64, 63 and 59 pounds. The second resulted in 10, 20, 45, 60, 110 and 115 pounds. Both resulted in mean catches per tow of 65 lbs. The first series of tows is a very precise estimate of abundance while the estimate of the second series is very imprecise. The range of values about the average in the first series (55-64) is much narrower than that of the second (19-115); therefore, confidence in the first average as an estimate of relative abundance is much greater than confidence in the second average. Nothing can be stated about the accuracy of either of the series of tows in providing estimates of true abundance. The degree of accuracy is affected by fish behavior, gear performance, and a possible mismatch between the timing and area of surveys in relation to fish movements and distribution.

Fisheries — dictionary. . 2004.

Look at other dictionaries:

  • optimum yield — the yield from a fishery which provides the greatest overall benefit to the nation with particular reference to food production, recreational opportunities and conservation or, allows rebuilding of overfished stocks. It is based on maximum… …   Dictionary of ichthyology

  • optimum yield — (OY) The yield from a fishery which provides the greatest overall benefit to the nation with particular reference to food production and recreational opportunities; it is based on MSY as modified by economic, social or ecological factors.… …   Fisheries — dictionary

  • DBLCI Optimum Yield (OY) Index — In May 2006, Deutsche Bank launched a new set of commodity index products called the Deutsche Bank Liquid Commodities Indices Optimum Yield, or DBLCI OY. The DBLCI OY indices are available for 24 commodities drawn from the energy, precious metals …   Wikipedia

  • DBLCI Optimum Yield (OY) Balanced Index — The DBLCI OY Balanced has the same underlying 14 commodities as the DBLCI OY Broad, but, the energy sector weight is reduced from 55% of the broad index to 35%. The DBLCI OY Balanced is designed to be UCITS III compliant, that is the weight of no …   Wikipedia

  • optimum sustainable yield — optimum yield …   Dictionary of ichthyology

  • Optimum sustainable yield in fisheries — In population ecology and economics, optimum sustainable yield is the level of effort (LOE) that maximizes the difference between total revenue and total cost. Or, where marginal revenue equals marginal cost. This level of effort maximizes the… …   Wikipedia

  • Optimum sustainable yield — In population ecology and economics, optimum sustainable yield is the level of effort (LOE) that maximizes the difference between total revenue and total cost. Or, where marginal revenue equals marginal cost. This level of effort maximizes the… …   Wikipedia

  • Optimum population — The optimum population is the size of a population that is optimal. There are, however, various opinions on what optimal means in this usage, resulting in various end targets for it,[1] but estimations usually take ecological sustainability and… …   Wikipedia

  • optimum height of burst — For nuclear weapons and for a particular target (or area), the height at which it is estimated a weapon of a specified energy yield will produce a certain desired effect over the maximum possible area …   Military dictionary

  • Maximum sustainable yield — In population ecology and economics, maximum sustainable yield or MSY is, theoretically, the largest yield (or catch) that can be taken from a species stock over an indefinite period. Fundamental to the notion of sustainable harvest, the concept… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”