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    STUDIA MATHEMATICA - Issue no. 2 / 2005  
         
  Article:   COMPARISON BETWEEN DIFFERENT HARVESTING MODE FOR NON-LINEAR AGE STRUCTURED FISH POPULATIONS.

Authors:  MOSTAFA K., S. MOHAMED, M. KHALED.
 
       
         
  Abstract:  The role of harvesting in discrete nonlinear agestructured fish population models has been studied. The overcompensatory Ricker recruitment function is considered in our model. We show numerically that the maximum sustainable yield (MSY) in harvesting with nets is differ ent very little from (MSY) in selective harvesting. Our models contai a large number of parameters such as mortality, Von Bertalanffy growth parameter and recruitment parameters. The influence of mortality has been studied. The age structured matrix model (general Leslie model) for description of harvesting population dynamics has been used because most marine fish exhibit a clear yearly cycle of sawning recruitment migration and growth.  
         
     
         
         
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