Polydora sp.

[s.handley at niwa.cri.nz]

Dear Michel

I developed a method of grading the shells to quantify infestations 
which gave quite good results for my MSc. thesis.  See:

Handley, S.J. & Bergquist, P.R. 1997a.  Spionid polychaete 
infestations of intertidal Pacific oysters Crassostrea gigas 
(Thunberg), Mahurangi Harbour, Northern New Zealand.  
Aquaculture.  153: 191-205. 

As far as extracting spionids, below is a previous message in reply 
to a similar request a few years ago.  It would be worthwhile 
checking Geoff's Annelida archives on the web page for other 
replies around that time.

Date sent:      	Thu, 17 Jul 1997 11:34:27 GMT+1200
Subject:        	Re: Extracting polydorids

> I would be grateful for any suggestions on how to extract 
polydorids

A method I have used to extract spionids from oysters is the use of 
the vermifuges: 0.5% phenol and/or 0.25% di-dichlorobenzene in 
seawater. The worms are expelled from their host if left overnight in
these solutions.  Caution is advised working with di-
chlorobenzene... 

For further reading on vermifuges and acid dissolution of coral see:

MacKenzie, C.L.; Shearer, L.W. 1959: Chemical control of Polydora
websteri and other annelids inhabiting oyster shells. Proceedings -
National Shellfisheries Association 50: 105-111.

Brock, R.E. and Brock, J.H. 1977: A method for quantitatively 
assessing the infaunal community in coral rock. Limnol.Oceanogr. 
22:948-951, . 

Regards....Sean  

_________________________________________
Dr Sean Handley      Marine Ecologist
National Institute of Water & Atmospheric Research
(NIWA) P.O. Box 893, Nelson, New Zealand
Ph (64 03)5481715    DDI (64 03) 545 7735
Fax (64 03)5481716   http://www.niwa.cri.nz/
_________________________________________


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