Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

Observations On the Narcotization of Crustacean Zooplankton 1)

Observations On the Narcotization of Crustacean Zooplankton 1) NOTES AND NEWS OBSERVATIONS ON THE NARCOTIZATION OF CRUSTACEAN ZOOPLANKTON 1) BY JOHN E. GANNON and SUSAN A. GANNON 2) Center for Great Lakes Studies, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53201, U.S.A. INTRODUCTION Crustacean zooplankton that is preserved with formalin undergoes an initial unfavorable reaction to this universal preservative. This reaction, termed here as "formalin frenzy", is expressed as violent locomotor activity prior to death that often causes rejection of gut contents, spilling of eggs from cladoceran brood pouches, and dropping of egg sacs by copepods. Elbourn (1966) suggested that a high percentage of empty guts in Cyclops strenuus stresauus (Fischer) was due to rejection of gut contents when preserved with formalin. We have often noted Daphnia pulex (L.) females to drop eggs from their brood pouches while swimming in an exceedingly erratic manner after the introduction of formalin into the water. These reactions to formalin present problems when samples have been procured expressly for purposes of food habit analyses by direct examination of gut contents or in calculations of secondary productivity involving counts of eggs per female and numbers of females with and without eggs. Consequently, it would be desirable to find a substance that would effectively http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Crustaceana Brill

Observations On the Narcotization of Crustacean Zooplankton 1)

Gannon, John E.; Gannon, Susan A.
Crustaceana , Volume 28 (1): 220 – Jan 1, 1975
Download PDF
5 pages

Loading next page...
 
/lp/brill/observations-on-the-narcotization-of-crustacean-zooplankton-1-aBhsb61tG3

References

References for this paper are not available at this time. We will be adding them shortly, thank you for your patience.

Publisher
Brill
Copyright
© 1975 Koninklijke Brill NV, Leiden, The Netherlands
ISSN
0011-216x
eISSN
1568-5403
DOI
10.1163/156854075X01099
Publisher site
See Article on Publisher Site

Abstract

NOTES AND NEWS OBSERVATIONS ON THE NARCOTIZATION OF CRUSTACEAN ZOOPLANKTON 1) BY JOHN E. GANNON and SUSAN A. GANNON 2) Center for Great Lakes Studies, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53201, U.S.A. INTRODUCTION Crustacean zooplankton that is preserved with formalin undergoes an initial unfavorable reaction to this universal preservative. This reaction, termed here as "formalin frenzy", is expressed as violent locomotor activity prior to death that often causes rejection of gut contents, spilling of eggs from cladoceran brood pouches, and dropping of egg sacs by copepods. Elbourn (1966) suggested that a high percentage of empty guts in Cyclops strenuus stresauus (Fischer) was due to rejection of gut contents when preserved with formalin. We have often noted Daphnia pulex (L.) females to drop eggs from their brood pouches while swimming in an exceedingly erratic manner after the introduction of formalin into the water. These reactions to formalin present problems when samples have been procured expressly for purposes of food habit analyses by direct examination of gut contents or in calculations of secondary productivity involving counts of eggs per female and numbers of females with and without eggs. Consequently, it would be desirable to find a substance that would effectively

Journal

Crustaceana – Brill

Published: Jan 1, 1975

There are no references for this article.