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15 Cards in this Set
- Front
- Back
Fishery
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A particular stock plus the fishing activities relating to its harvest including fishermen, vessels gears and associated facilities.
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Population
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All the individuals of a given species in a given area
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Unit Stock
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Discrete population which has the same gene pool, is self-perpetuating and has little connection with adjacent populations]
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Fishery Dependent Data
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Logbooks maintained by vessels or or from inspections, on board observers or interviews
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Fishery Independent Data
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Data from surveys, experimental, fishing acoustic surveys, mark an recapture, genetic studies
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Maximum Sustainable Yield (MSY)
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The the largest long-term theoretical average catch or yield that can be taken from a stock
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Bmsy
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The biomass at the maximum sustainable yield
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Fmsy
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The effort at the maximum sustainable yield
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MEY
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Maximum Economic Yield occurs at half of the economic break point (where the revenue from a catch and the cost of he effort to catch are equal). This can be below the MSY if yield and cost have a linear relationship.
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Spawning Stock Biomass
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The stock population capable of reproducing. Can be affected by needing to get to a certain size/age before reproduction or phenology.
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Cohort
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A group of subjects that have shared a set of events over a particular time span.
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Surplus Production Model (SPM) or dynamic biomass model
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Works under the principle that fish produce more offspring than is needed to replenish themselves. The surplus can be harvested without endangering the population. The models consider biomass as a whole (no age structure is used)
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Virtual Population Analysis
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A way of keeping tack of age cohorts in a fishery. The catch at the terminal year (no fish are assumed to live past this) and work backwards each year adding M on until you get back to the earliest recruitment year.
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Yield per recruit model
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Used to address the problem: do you capture lots of young fish (occurs with high effort) or few old fish (occurs with low effort)?
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Recruitment
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The fish that are added into the fishery population from all the offspring.
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