# Changes between Version 1 and Version 2 of EwEugPredictingSpatialFishingPatterns

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Timestamp:
2010-01-31 15:42:53 (10 years ago)
Comment:

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• ## EwEugPredictingSpatialFishingPatterns

 v1 Assuming that there are ''N'' cells representing water areas, each fleet k can cause a total fishing mortality rate ''N · F,,k,,''. For each step in the simulation this rate is distributed among cells, c, in proportion to the weights ''G,,kc,,'' based on: ../Resources/Images/08000046.png'''Eq. 68''' [[Image(wiki:EwEugImages:08000046.png)]] '''Eq. 68''' where ''Okc'' is 1 if cell ''c'' is open to fishing by fleet k, and 0 if not; ''U,,kc,,'' is 1 if the user has allowed fleet ''k'' to work in the habitat type to which cell'' c'' belongs, and 0 if not; ''p,,ki,,'' is the relative price fleet k receives for group ''i'' fish, ''q,,ki,,'' is the catchability of group i by fleet k (equal to the ''F,,ki,,'' in the Ecopath model); ''B,,ic,,'' is the biomass of group i in cell c; and ''C,,kc,,'' is the cost for fleet ''k'' to operate in cell ''c''. Based on the weights in Eq. 68 the total mortality rate is distributed over cells according to ../Resources/Images/08000047.png'''Eq. 69''' [[Image(wiki:EwEugImages:08000047.png)]] '''Eq. 69''' while each group in the cell is subject to the total fishing mortality ../Resources/Images/08000048.png'''Eq. 70''' [[Image(wiki:EwEugImages:08000048.png)]] '''Eq. 70'''