Aspects of the washout of salmonid eggs. 2. Effects of drifting on development and survival of eggs of brown trout (Salmo trutta L.)

Crisp, D.T. (1984) Aspects of the washout of salmonid eggs. 2. Effects of drifting on development and survival of eggs of brown trout (Salmo trutta L.). Ambleside, UK, Freshwater Biological Association, 33pp. (WIT/73/20).

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Abstract

At high stream discharges salmonid eggs can he displaced from the gravel and may drift downstream. It has been suggested that developing salmonid eggs may be killed by ”physical shock”, especially during the period before ”eyeing”. Similarly, a progress report by the International Pacific Salmon Fisheries Commission (1966) states that salmonid eggs are most sensitive during the period between fertilisation and blastopore closure. However, it would seem unlikely that this sensitivity actually begins at the time of fertilisation because, in nature, a period, perhaps measured in hours, must occur during which the newly-fertilised eggs are exposed to physical shock during the deposition of gravel over them as a result of the cutting activity of the female fish. The present report describes simple channel experiments designed to answer the two questions: 1. After release of eggs from the gravel, does the process of drifting downstream, which implies some physical shock through movement and impact, decrease the survival of salmonid eggs? 2. Is the survival rate-influenced by the stage of development of the eggs?

Item Type: Monograph or Serial Issue
Title: Aspects of the washout of salmonid eggs. 2. Effects of drifting on development and survival of eggs of brown trout (Salmo trutta L.)
Personal Creator/Author:
CreatorsEmail
Crisp, D.T.
Number of Pages: 33
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; Channels; Experimental research; Fish eggs; England, Grassholme
Subjects: Ecology
Fisheries
Limnology
Item ID: 5096
Depositing User: Hardy B Schwamm
Date Deposited: 21 Apr 2011 19:24
Last Modified: 29 Sep 2011 15:24
URI: http://aquaticcommons.org/id/eprint/5096

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