Changes between Version 2 and Version 3 of EwEugLandings


Ignore:
Timestamp:
2010-11-24 00:16:57 (9 years ago)
Author:
shermanl
Comment:

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Legend:

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  • EwEugLandings

    v2 v3  
    33Landings and catches are not the same, as discarding is an integral part of most fishing operations. Ecopath calculates: Catch = landings + discards. 
    44 
    5 You should therefore enter only the landings here - while any discards should be entered on the [EwEugDiscards discards] form. Landings must be expressed as flows, typically in t/km²/year. The area to be used should be the total area of your model, not just habitat area, or the area in which the fleet operates. For instance, if you are entering information for a coastal shrimp fishery, the landings (and discards) should be calculated relative to the total area of the model even if most of it is too deep for trawling. 
     5You should therefore enter only the landings here - while any discards should be entered on the [EwEugDiscards discards] form. Landings must be expressed as flows, typically in t/km²/year. The area to be used should be the total area of your model, not just habitat area, or the area in which the fleet operates. For instance, if you are entering information for a coastal shrimp fishery, the landings (and discards) should be calculated relative to the total area of the model - even if most of it is too deep for trawling. 
    66 
    77In a model of an ecosystem exploited by a fishery, the catch is the total extractions over the time period considered in the model, (e.g., a year), for each of the groups modelled. Similarly, in an aquaculture system the 'catch' is the harvest from each group over the time period considered, (e.g., a growing season).