[NatureNS] Trout and Snails

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Date: Thu, 10 Nov 2011 06:11:07 -0800 (PST)
From: Paul MacDonald <paulrita2001@yahoo.com>
To: "naturens@chebucto.ns.ca" <naturens@chebucto.ns.ca>
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Thanks to Fred and Dusan =A0for the advice on a book.=0AAnd also Ulli for t=
he parasitology note. It was not my favorite=0Acourse but I passed!=0AThe b=
ook has been ordered and a good topic to study over winter=0Abefore the fis=
hing times are on us again.=0AFred mentioned reports of "Trout been stuffed=
 with snails".=0ASeems that when we see snails in trout they are really stu=
ffed with them.=0ANone with a few. It would suggest that snails are either =
very available=0Ato the trout or none. I will save some samples next time.=
=0AThanks again=0APaul=0A=0A=0A________________________________=0AFrom: Fre=
derick W. Schueler <bckcdb@istar.ca>=0ATo: naturens@chebucto.ns.ca=0ACc: Ro=
b Dillon <dillonr@cofc.edu>=0ASent: Thursday, November 10, 2011 9:49:32 AM=
=0ASubject: Re: [NatureNS] Trout and Snails=0A=0AOn 11/10/2011 7:16 AM, Dus=
an Soudek wrote:=0A>=A0  Aquatic "snails?" Do any species utilize anadromou=
s fish species to=0A> take their larvae upstream, thus establishing and mai=
ntaining=0A> populations in headwater lakes and streams.=0A=0A* not as far =
as I know. Snails are born alive or hatched from eggs in jelly, and don't h=
ave a specialized dispersal phase. They're thought to spread by sticking to=
 the feet or plumage of Birds and then dropping off. Often there are striki=
ng instances of water bodies which lack aquatic snails. I'm copying this to=
 Rob Dillon, who runs the Freshwater Gastropods of North America - http://f=
wgna.blogspot.com/ - and would know if any such early-life dispersal adapta=
tions are known.=0A=0A> This is quite common in the=0A> "snails'" cousins, =
the bivalve molluscs.=0A> I remember reading about a freshwater mussel spec=
ies becoming extinct in=0A> N.B.'s Petitcodiac River, after the tidal dam/c=
auseway in Moncton=0A> destroyed the salmon run there. I do wonder whether =
this species is back=0A> now that the dam is open again.=0A=0A* we drove pa=
st there this summer, and regretted not having the time or low water that w=
ould be needed to search, but this was an isolated population (nearest was =
in New Hampshire - none in Maine) - of a short-lived species - Alasmidonta =
heterodon - see http://en.wikipedia.org/wiki/Dwarf_wedgemussel=0A=0A> I hav=
e never come across a good review of this topic. The larvae of=0A> relative=
ly immobile invertebrates literally hitching rides on highly=0A> mobile sea=
run fish to travel hundreds of miles upstream...=0A=0A* the species that ha=
s made big range expansion after coastal dams have been removed is Anodonta=
 implicata, the Alewife Floater, which has the host suggested by its Englis=
h name, and also uses shad as a host, and which has gone scores or hundreds=
 of km upstream when dams have been removed. It used to get (rarely) as far=
 upstream as Ottawa before the Seaway.=0A=0Afred.=0A-----------------------=
-------------------------------------=0A=A0 =A0 =A0 =A0  Frederick W. Schue=
ler & Aleta Karstad=0ABishops Mills Natural History Centre - http://pinicol=
a.ca/bmnhc.htm=0AMudpuppy Night in Oxford Mills - http://pinicola.ca/mudpup=
1.htm=0ADaily Paintings - http://karstaddailypaintings.blogspot.com/=0A=A0 =
=A0 RR#2 Bishops Mills, Ontario, Canada K0G 1T0=0A=A0 on the Smiths Falls L=
imestone Plain 44* 52'N 75* 42'W=0A=A0  (613)258-3107 <bckcdb at istar.ca> =
http://pinicola.ca/=0A-----------------------------------------------------=
-------=0A------------------------------------------------------------
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<html><body><div style=3D"color:#000; background-color:#fff; font-family:ti=
mes new roman, new york, times, serif;font-size:12pt"><div><span>Thanks to =
Fred and Dusan &nbsp;for the advice on a book.</span></div><div><span>And a=
lso Ulli for the parasitology note. It was not my favorite</span></div><div=
><span>course but I passed!</span></div><div><span>The book has been ordere=
d and a good topic to study over winter</span></div><div><span>before the f=
ishing times are on us again.</span></div><div><span>Fred mentioned reports=
 of "Trout been stuffed with snails".</span></div><div><span>Seems that whe=
n we see snails in trout they are really stuffed with them.</span></div><di=
v><span>None with a few. It would suggest that snails are either very avail=
able</span></div><div><span>to the trout or none. I will save some samples =
next time.</span></div><div><span>Thanks again</span><br>Paul</div><div><br=
></div><div style=3D"font-size: 12pt; font-family: 'times new roman',
 'new york', times, serif; "><div style=3D"font-size: 12pt; font-family: 't=
imes new roman', 'new york', times, serif; "><font size=3D"2" face=3D"Arial=
"><hr size=3D"1"><b><span style=3D"font-weight:bold;">From:</span></b> Fred=
erick W. Schueler &lt;bckcdb@istar.ca&gt;<br><b><span style=3D"font-weight:=
 bold;">To:</span></b> naturens@chebucto.ns.ca<br><b><span style=3D"font-we=
ight: bold;">Cc:</span></b> Rob Dillon &lt;dillonr@cofc.edu&gt;<br><b><span=
 style=3D"font-weight: bold;">Sent:</span></b> Thursday, November 10, 2011 =
9:49:32 AM<br><b><span style=3D"font-weight: bold;">Subject:</span></b> Re:=
 [NatureNS] Trout and Snails<br></font><br>On 11/10/2011 7:16 AM, Dusan Sou=
dek wrote:<br>&gt;&nbsp;  Aquatic "snails?" Do any species utilize anadromo=
us fish species to<br>&gt; take their larvae upstream, thus establishing an=
d maintaining<br>&gt; populations in headwater lakes and streams.<br><br>* =
not as far as I know. Snails are born alive or hatched from eggs in jelly, =
and don't
 have a specialized dispersal phase. They're thought to spread by sticking =
to the feet or plumage of Birds and then dropping off. Often there are stri=
king instances of water bodies which lack aquatic snails. I'm copying this =
to Rob Dillon, who runs the Freshwater Gastro