LISTSERV mailing list manager LISTSERV 15.5

Help for FISH-SCI Archives

FISH-SCI Archives

FISH-SCI Archives


Next Message | Previous Message
Next in Topic | Previous in Topic
Next by Same Author | Previous by Same Author
Chronologically | Most Recent First
Proportional Font | Monospaced Font


Join or Leave FISH-SCI
Reply | Post New Message
Search Archives

Subject: Re: Pollachius pollachius / Molva molva tumour ?
From: oleg pashuk <[log in to unmask]>
Reply-To:Scientific forum on fish and fisheries <[log in to unmask]>
Date:Thu, 5 May 2005 11:32:40 -0400

text/plain (104 lines)

><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><>
If you reply to this message, it will go to all FISH-SCI members.
><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><>

Infrequently, we observe something like that on gag grouper gonads
(Mycteroperca microlepis) off the southeastern United States and, as it can
be seen in histological preparations, these so-called "tumors" contain
"mummified" yolk oocytes or hydrated oocytes, apparently formed a long time
ago when ovarian wall ruptured, and healed since then. They are present even
after female gag changed sex (gag grouper are protogynous hermaphrodites).
It is possible that similar structures can be formed on other internal
organs, due to wall rupture, or irritation.

Oleg Pashuk

-----Original Message-----
From: Scientific forum on fish and fisheries
[mailto:[log in to unmask]]On Behalf Of Richard Lord
Sent: Wednesday, May 04, 2005 4:35 AM
To: [log in to unmask]
Subject: Pollachius pollachius / Molva molva tumour ?

><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><>
If you reply to this message, it will go to all FISH-SCI members.
><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><>

I received the following message from a Guernsey angler.  Any insights
into this observation would be appreciated.  Reproductive tissue has
been dismissed by the angler.  Thank you for any help you can provide
with the identity of this growth in the peritoneal cavity.

From: Mark Page - [log in to unmask]

Further to our conversation on the 'tumours' found in Pollack,
Pollachius pollachius & ling, Molva molva, here's the info: I have
caught 3 fish with these 'tumours' (two pollack & one ling).  They came
from 2 old (World War II or older I believe) wrecks on the edge of the
Hurd deep near Alderney, Channel Islands, Great Britain in 70 - 120
metres of water.    I will have to check my diary, but I have had about
200 pollack, ling & cod off these wrecks since I started fishing them
last July.  As far as I know, no-one else fishes them. The 'tumours'
come from the cavity containing the stomach, liver, gonads etc.  The
'tumours' aren't really attached to anything, and appear to have grown
around the internal organs, taking on the forms of whatever they've
developed next to like a mould.  They are medium brown in colour, and
textured.  They feel like a stiff plastic or resin, but are definitely
biological, not plastic.  Holding one up to a light revealed that it was
uniform in density, and cutting it revealed no obvious structure. The
fish they came from all appeared to be in a perfectly healthy condition,
and certainly fought as hard as any other fish caught there.  I have not
noticed any defects in any of the other fish other than
discoloured/spotted livers in a few. I can't remember exact sizes, but
the fish on these wrecks average between 7 & 14 lbs (3 & 7 kg) in
weight. After leaving a 'tumour' outside overnight it had started to dry
out and turn paler on the edges.  It was also attractive to my cats who
started chewing it!! Pictures here:

Feel free to forward this onto any interested parties.  I have never had
any fish from anywhere else with these 'tumours', but then again I've
not had as many fish from other wrecks.  I have shown a couple of
friends the 'tumour' in the picture, but they've never seen the likes of
it before, other than items in the fishes gut itself which have been
encased in a secretion from the guts (a bit like a fish version of

        Mark Page


The 'tumour' is definitely not a deformed roe sack as the fish have had
these present in addition to the 'tumours'.  Position-wise, the
'tumours' seem to lie near the head end of the cavity, whereas roes are
at the tail end.  The 'tumours' are on the outside of the internal
organs as one side is flatter from the body cavity wall. Cheers, Mark


Best Wishes,
Yours sincerely,
Richard Lord
Guernsey GY1 1BQ

Tel: 01481 700688
Fax: 01481 700699
Email: [log in to unmask]

><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><>
       To leave the Fish-Sci list, Send blank message to:
        mailto:[log in to unmask]
 For information send INFO FISH-SCI to [log in to unmask]
><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><>

><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><>
       To leave the Fish-Sci list, Send blank message to:
        mailto:[log in to unmask]
Vacation? send SET FISH-SCI NOMAIL to [log in to unmask]
><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><>

Back to: Top of Message | Previous Page | Main FISH-SCI Page



CataList Email List Search Powered by the LISTSERV Email List Manager