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Re: Sustainable Aquaculture



In article <pYwo4DA+weZyEwdt@keepersfarm.demon.co.uk>, "S.C.Webb"
<s.c.webb@keepersfarm.demon.co.uk> writes
>In article <u5uRABA0G4YyEw3t@fishace.demon.co.uk>, Stephen Bedford Clark
><sbc@fishace.demon.co.uk> writes
>>In article <Pine.SGI.3.91r.961014204807.20600J-100000@freenet>, Brian K
>>Petroski <petroski@freenet.msp.mn.us> writes
>>>On Sun, 13 Oct 1996, Stephen Bedford Clark wrote:
>>>
>>>> Does this newsgroup still cover the issues and development of
>>>> sustainable freshwater aquaculture?.
>SNIP
>
>
>>>                           Brian Petroski
>>>
>>>
>>Dear Brian,
>>
>>Depends very much on your local species and the levels of dissolved
>>oxygen in the water.
>>
>>Obviously, you want to produce fish which is acceptable to your taste.
>>
>>Carnivorous species (trout, bass, catfish) would compete with the
>>crayfish, so it would need to be a omnivore/herbivore such as the common
>>carp. This fish is cultured in Asia & Europe for food and could be
>>introduced to your system.
>SNIP
>>
>>Stephen
>>
>>A list of services and experience are available at:
>>http://www.fishace.demon.co.uk/index.htm
>
>Dear Stephen
>
>How competive are brown trout when mixed with Signal crayfish. I have
>both in the same pond but because of the acidity of the water and high
>summer temperatures the trout numbers are low. However, is this low
>number still sufficient to seriously impact the growth of my crayfish
>population. I would rather raise the crayfish than the trout as the
>latter often taste slightly muddy.
>
>Stuart.

Dear Stuart,

It sounds like that you will be not far off a natural stocking density
in your pond and that their will be balanced available food supply.

My earlier points were directed to aquaculture operations with higher
stocking densities, input feed and competitive imbalance in the aquatic
food chain.

The best advice is that if your natural ecosystem sustains your needs
and seems to functioning correctly then leave it alone.

Stephen

SBC & Associates
Sustainable Freshwater Ecology & Aquaculture Consultancy Services
7 Ballam Avenue
Scawthorpe
Doncaster
United Kingdom DN5 9DY
Tel: + 44 (0)1302 782597
Fax: + 44 (0)1302 782597
email: sbc@fishace.demon.co.uk

A list of services and experience are available at:
http://www.fishace.demon.co.uk/index.htm



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