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


Re: Anguilla anguilla feeding on Daphnia


[log in to unmask]


Scientific forum on fish and fisheries <[log in to unmask]>


Tue, 18 Nov 2008 11:24:26 -0500





text/plain (1 lines)

Thanks Chris, pretty big eels for feeding on Daphnia. Could be the nets
provide food or warmth. Another question. What kind of isotope signature
will zooplankton leave, and what would it tell you? We've been
investigating a PCR assay to help identify A. crassus hosts. The isotope
analysis may be of use too.

Bob Graham
Environmental Biology
4111 Castlewood Road
Richmond, VA 23234
[log in to unmask]
Pager 7044
804 271-5377

             Chris Harrod
             <[log in to unmask]
             uk> To
             Sent by: [log in to unmask]
             Scientific forum cc
             on fish and
             fisheries Subject
             <[log in to unmask] Re: Anguilla anguilla feeding on
   > Daphnia
             11/18/2008 10:43
             Please respond to
             Scientific forum
                on fish and
             <[log in to unmask]

Hi Bob

Thanks for the answer. I was also interested in the question of paratenic

The eels were captured in fykenets, and varied between 421 and 850 mm.
I'm still wondering if the daphnia became aggregated in the fyke net and
the eels simply responded to this (I really don't trust eel dietary studies
based on fyke nets). Unfortunately, there is no other way we can sample
these particular lakes.

I'm a stable isotope ecologist so we will run these eels to see if they
have a zooplankton signature...

All the best


-----Original Message-----
From: Scientific forum on fish and fisheries
[mailto:[log in to unmask]] On Behalf Of [log in to unmask]
Sent: 18 November 2008 15:29
To: [log in to unmask]
Subject: Re: Anguilla anguilla feeding on Daphnia


I've not heard of this, but am curious because crustaceans may be
intermediate or paratenic hosts for Anguillacola crassus, a parasite of
concern here in North America. How big were the eels? Thanks.

One note. We looked at stomach contents of American eels in the Roanoke
River, North Carolina, in 2000 and found a prevalent food item in eels up
to around 350 mm was small case-building caddisflies (Trichoptera), of a
sort that built their cases from Hydrilla verticillata leaves. Because the
cases were usually intact, are usually attached to a substrate, and the
eels were collected from dense patches of Hydrilla, it appeared the eels
had actively found and fed on the caddisflies. May be smaller food items
are more frequently utillized by eels than we'd previously thought.

Bob Graham
Environmental Biology
4111 Castlewood Road
Richmond, VA 23234
[log in to unmask]
Pager 7044
804 271-5377

             <[log in to unmask] To
             uk> [log in to unmask]
             Sent by: cc
             Scientific forum
             on fish and Subject
             fisheries Anguilla anguilla feeding on
             <[log in to unmask] Daphnia

             10/04/2008 12:23

             Please respond to
             Scientific forum
                on fish and
             <[log in to unmask]

Dear all

Another question about people's experience, this time about eels (Anguilla
anguilla & others).

A student of mine came has been working on a freshwater lake, and reported
that he was getting large numbers of Daphnia from yellow eel stomachs
(TL>400 - 800 mm).I rose my eyebrows and suggested that he was likely to be
mistaken, but to my surprise, he was right. Some individuals had stomachs
distended with the volume of Daphnia they had consumed. Now, I can imagine
glass eels feeding on zooplankton, but struggle to think of how yellow eels
would do this....

Has anyone ever recorded yellow eels feeding on Daphnia or read of reports
in the literature?

Thanks in advance


><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><
Dr Chris Harrod
Lecturer in Fish and Aquatic Ecology
Queen's University Belfast
School of Biological Sciences
Medical Biology Centre
97 Lisburn Road
Belfast BT9 7BL
[log in to unmask]
Tel: +44 (0) 28 909 72271
Mob: +44 (0) 79 77419314
Lab: +44 (0) 28 909 72106
Fax: +44 (0) 28 909 75877
<>< <>< <>< <>< <>< <>< <>< <>< <>< <>< <>< <>< <>< <><

CONFIDENTIALITY NOTICE: This electronic message contains
information which may be legally confidential and/or privileged and
does not in any case represent a firm ENERGY COMMODITY bid or offer
relating thereto which binds the sender without an additional
express written confirmation to that effect. The information is
intended solely for the individual or entity named above and access
by anyone else is unauthorized. If you are not the intended
recipient, any disclosure, copying, distribution, or use of the
contents of this information is prohibited and may be unlawful. If
you have received this electronic transmission in error, please
reply immediately to the sender that you have received the message
in error, and delete it. Thank you.

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



CataList Email List Search Powered by the LISTSERV Email List Manager