Term
| fishing down the food web |
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Definition
| switching to less desirable species as originals are depleted |
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Definition
| a system consisting of man, fish and the environment |
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Term
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Definition
| Goal of Fisheries Management |
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Term
| 2. Protection/ Restoration of endangered sp |
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Definition
| Goal of Fisheries Management |
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| 3. Attain Maximum sustainable yield or achieve a reference point |
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Definition
| Goal of Fisheries Management |
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| Biological Reference Points (BRP): |
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Definition
| Precautionary management strategy |
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Term
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Definition
| Commercial size and catch limits, Bycatch reduction devices |
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| Holistic Methods use what data? |
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Definition
| Catch and Effort Data, Research survey Data |
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| Russel (1931) simple population model |
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Definition
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| an abstract representation of how the system works |
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| the value of a model is in... |
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Definition
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| Conceptual, Verbal, Static, Dynamic |
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| A mathematical model is most likely |
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Definition
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Definition
Consists of at least one variable
that can be manipulated (eg fishing effort) or is believed
to influence at least 1 variable we are interested in (eg catch) |
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Definition
| something that can be defined and measured |
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Definition
| dictate how variables interact; processes, must be estimated to fit model |
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| Example of a simple model |
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Definition
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Definition
| difference between observed and predicted values |
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Definition
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Definition
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Definition
| R base console, R studio, R commander |
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Term
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Definition
| # of organisms per unit area or volume |
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Term
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Definition
| Total # of organisms in the population of interest |
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Definition
| biased, decision to sample where organisms are likely to occur or where they arent |
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Term
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Definition
| each sample has the same likelihood of selection |
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Definition
| population defined by the totality of all possible values of a characteristic for a group |
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Definition
| all elements under investigation |
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Definition
| some of the elements under investigation |
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Definition
| estimators of population parameters |
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Definition
| true population statistics |
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Term
| systematic error or biased estimator |
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Definition
| an estimator that gives sample statistics when averaged does not give a value close to the parametric value |
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Definition
| inversely related to amount of variation between individual estimates of the statistic |
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Definition
| inversely related to distance of the estimate of statistic to the actual value (parameter) being estimated |
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Term
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Definition
| Consistent pattern in inaccuracy |
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Term
| 1. Every member has equal chance of being sampled |
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Definition
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Term
| 2. a probability based sample |
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Definition
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Definition
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Term
| sampling with replacement |
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Definition
| each element of the population can be sampled more than once, 2 sample values are independent (Covarience between the two is 0) |
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Definition
| sampling without replacement |
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Term
| stratified random sampling |
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Definition
| random sample collected from subdivision of population based on some criteria the we believe affects probability of capture. Strata are homogenous |
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Term
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Definition
| subdivided into sample areas chosen randomly take all random samples from a single area, usually used due to logistical issues |
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Term
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Definition
| decide on gap distance ( every 4th fish) |
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Term
| 3 most common sampling designs |
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Definition
| Random, Stratified Random, and Systematic Sampling with random start |
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Term
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Definition
| rely on the results of sampling program to direct future sampling |
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Term
| Factors affecting sampling design |
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Definition
| Cost,methods used, experimental design, inherent variablity of data, size/ magnitude of difference you wish to detect, desired power of the test |
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Definition
| affected by effort and sampling method, type of information desired and method use to aquire |
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Definition
| Gear does not move through the water, depend on animal behavior to catch them |
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Definition
| Entangling (gillnet), entrapment (crab trap), Angling (long line) |
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| trawls, plankton nets, sediment coring, harpoons |
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Definition
| hypothesis to be tested ( assumed true until evidence shows otherwise) |
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Definition
| Statement that parameter differs from value or between populations, ( can never prove alternative only reject the null) |
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Definition
| reject null hypothesis when in fact it is true |
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Definition
| Accept null hypothesis when in fact it is false |
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Definition
anything used for recognition ( external, internal, part of body tissue)
ex. fin clip |
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Definition
contain specific ID information
ex. external tags, pit tags coded wire tags |
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Definition
| radio, acoustic, satellite. used for movement and migration studies |
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Term
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Definition
movement into and out of the system
use Jolly Seber |
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Definition
no movement into or out of the system
use lincoln peterson, schnabel method, schumacher and eschmeyer methods |
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Term
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Definition
Population estimate (N): N= C*M/R
assume (N/M) = (C/R) |
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Term
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Definition
| Seber (AKA Chapman) is unbiased estimator if R is greater than 7. Sampling WITHOUT replacement. N=[(M+1)(C+1)/(R+1)]-1 |
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Definition
| unbiased if R is greater than 7. Sampling WITH replacement, N=M(C+1)/(R+1) |
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