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Dear All:

Assessing an ecosystem is really not so easy.
However, assessing the carrying capacity of some species seems being 
possible.
Before now, we seems targeting on assessing fish stocks,
but ignored how to assessing the carrying capacity.

As you know, constant carrying capacity means constant environmental 
conditions.
If the species is really always living in  the same environmental 
conditions,
then the stock size should be stable.   If really it is, then what is the 
population dynamics?

As you know, different environmental condition affects the stock size.
Meanwhile, different density also implies the unstable environmental 
condition.

Stable environmental condition can be obtained only if the stock size is 
also keeping constant.
Unfortunately, we always tried to assess the fish stock based on stable 
environmental condition.
It seems an contradiction.

C.H. wang
Aug. 11,  2006

----- Original Message ----- 
From: "Les Kaufman" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, August 09, 2006 10:15 AM
Subject: Re: Deep Threats for High Seas


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> To Mr. Wang and others,
>
> The habitats that Dr. Earle was speaking of in her editorial "Deep 
> Threats for High Seas" are constructed and inhabited by, for the most 
> part, extremely slow-growing organisms about which very little is  known. 
> They can not be exploited in a sustainable manner on any time  scale of 
> interest to human industry.   They can certainly be  exploited, but for 
> all intents and purposes, only once.   We  generally refer to this as 
> mining.  What sustainable utility there  may be is much more likely to lie 
> in the natural products chemistry  of these organisms than in the mining 
> of fish populations for food  and its accompanying blind destruction of 
> the coral and other  invertebrate habitats that support them.   We are not 
> talking here  about animals like mahimahi or yellowfin tuna, that can 
> theoretically  be removed without dismembering their supporting ecosystem, 
> and with  reasonable expectation of their populations bouncing back.
>
> There is no good scientific justification for deep sea trawling, and  the 
> arguments against it are excellent.  We should simply and  vociferously 
> oppose this practice, as Dr. Earle suggests.
>
> Les Kaufman
>
>
>
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