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Subject: Re: depensatory exploitation
From: "Trevor J. Kenchington" <[log in to unmask]>
Reply-To:Scientific forum on fish and fisheries <[log in to unmask]>
Date:Fri, 28 Jul 2006 19:36:19 -0300
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Rom Lipcius wrote:

> Yes, exploitation rate or fishing mortality rate increases at  
> decreased stock/population levels, for instance when fishers  
> attempt to catch the same number of animals annually, irrespective  
> of stock size.
>
>>> I am investigating depensatory exploitation of the Chesapeake Bay  
>>> blue crab population, and have been searching for published  
>>> examples of depensatory exploitation, particularly in marine  
>>> invertebrates. I have found some examples for fish, but none yet  
>>> for marine invertebrates. Does anyone know of any published  
>>> examples of depensatory exploitation in marine (or estuarine)  
>>> invertebrates?

Thus defined, I would expect some degree of "depensatory  
exploitation" to be a normal feature of all fisheries (though, as  
ever, there will be specific exceptions), at least across some ranges  
of biomass and subject to masking by other  factors (e.g. a collapse  
in market prices as biomass declines).

Most stock assessments that document time series of biomass and  
fishing mortality should provide examples.


Trevor Kenchington

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