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Re: daily growth increments & storms


[log in to unmask]


Academic forum on fisheries ecology and related topics <[log in to unmask]>


Mon, 13 May 1996 09:13:30 MST





text/plain (1 lines)

     two such ototlith references are

     Panfili and Ximenes 1992. Measurements on ground or sectioned
     otoliths: possibilities of bias. J off Fish Bio. 41:201-207.

     Grahm and Orth 1987 Otolith aging of yoy smb in R.C. Summerfelt and
     G.E.Hall edts. The Age and Growth of Fish, Th Iowa StateUniversity
     Press. Ames,Iowa

     I counted daily increments on yoy smallmouth bass. I adapted the
     grahm and orth method and found that a biosonics video setup made life
     much easier and the eyes crossed much less.

     If you would like details I would be happy to discuss the methods: M.
     Mccosh 716- 691-5456
     or [log in to unmask]

______________________________ Reply Separator _________________________________
Subject: daily growth increments & storms
Author: Academic forum on fisheries ecology and related topics
<[log in to unmask]> at 9DE~INTR
Date: 12/12/96 11:00 AM

One of my graduate students Kathleen McDaniel
([log in to unmask]) is interested in determining whether
storm events which produce high flows in a southern Appalachian
stream produces detectable changes in the daily growth increments
in mottled sculpin (Cottus bairdi). Our hypothesis is that storm
events that disturb the substratum will have a negative effect on
growth by: 1) reducing prey availability for sculpin (i.e. through
mortality orreduced movements of invertebrates), or 2) reduced
foraging activity of sculpin, 3) other possibilities exist but we won't
bore you with them all. Annuli on sculpin saggitae are easily visible
with a dissecting microscope, and other investigators have validated
annuli for sculpinin other regions. We haven't found very many
references (<5) on the detection of daily growth increments in
stream fishes, and are wondering if other investigators are currently
engaged in this pursuit (hmm I should be able to list the all the ones
we've found, but the papers r at home, there was ben victor's study
on fallfish and one on competition between salmonids). Any
comments on this thread would be welcome as would references we've
missed (send them directly to kathleen's e-mail address and
she will then summarize them for the list, god its rough being a grad
student these days isn't it). BTW we do have the book edited by
D.Secor on Recent Developments in Otolith Research (the S.
Carolina Press book). Also we are hoping to find a lab that would
be willing to show Kathleen how to prepare the otoliths (we can
read them here). We have a total of 400 that need to be prepared
and examined. The sagittae range from about 2.5 mm to 5 mm in
maximum length, and the maximum age wehave detected is six.
One last note, if we should have saved all the lapilli please mail
meprivately, cuz you guessed it, they were impossible to find, so we
don't have any.

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