Aspects of the washout of salmonid eggs. 1. Observations on the physical characteristics of real and artificial eggs, their rate of fall in a water column and their pattern of settlement in an experimental channel

Crisp, D.T. (1984) Aspects of the washout of salmonid eggs. 1. Observations on the physical characteristics of real and artificial eggs, their rate of fall in a water column and their pattern of settlement in an experimental channel. Ambleside, UK, Freshwater Biological Association, 46pp. (WIT/73/19).

[img]
Preview
PDF (The document's language is English .) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
Download (224Kb) | Preview

Abstract

When salmonid redds are disrupted by spates, the displaced eggs will drift downstream. The mean distance of travel, the types of locations in which the eggs resettle and the depth of reburial of displaced eggs are not known. Investigation of these topics under field conditions presents considerable practical problems, though the use of artificial eggs might help to overcome some of them. Attempts to assess the similarities and/or differences in performance between real and artificial eggs are essential before artificial eggs can validly be used to simulate real eggs. The present report first compares the two types of egg in terms of their measurable physical characteristics (e.g. dimensions and density). The rate at which eggs fall in still water will relate to the rate at which they are likely to resettle in flowing water in the field. As the rate of fall will be influenced by a number of additional factors (e.g. shape and surface texture) which are not easily measured directly, the rates of fall of the two types of egg have been compared directly under controlled conditions. Finally, comparisons of the pattern of settlement of the two types of egg in flowing water in an experimental channel have been made. Although the work was primarily aimed at testing the value of artificial eggs as a simulation of real eggs, several side issues more directly concerned with the properties of real eggs and the likely distance of drift in natural streams have also been explored. This is the first of three reports made on this topic by the author in 1984.

Item Type: Monograph or Serial Issue
Title: Aspects of the washout of salmonid eggs. 1. Observations on the physical characteristics of real and artificial eggs, their rate of fall in a water column and their pattern of settlement in an experimental channel
Personal Creator/Author:
CreatorsEmail
Crisp, D.T.
Number of Pages: 46
Date: 1984
Publisher: Freshwater Biological Association
Place of Publication: Ambleside, UK
Issuing Agency: Freshwater Biological Association
Uncontrolled Keywords: Freshwater ecology; Rivers; Freshwater fish; Life cycle; Fry; Redds; Induced breeding; Channels; Experimental research; Fish eggs; England, Grassholme
Subjects: Ecology
Fisheries
Limnology
Item ID: 5095
Depositing User: Hardy B Schwamm
Date Deposited: 21 Apr 2011 19:24
Last Modified: 29 Sep 2011 15:24
Related URLs:
URI: http://aquaticcommons.org/id/eprint/5095

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...