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A field-based assessment of oxygen supply to incubating Atlantic salmon(salmon salar) embryos

Greig, S.M., Sear, D.A. and Carling, P.A. (2007) A field-based assessment of oxygen supply to incubating Atlantic salmon(salmon salar) embryos Hydrological Processes, 21, (22), pp. 3087-3100. (doi:10.1002/hyp.6635).

Record type: Article

Abstract

Oxygen fluxes through artificially created salmon redds within four UK rivers were quantified and assessed against survival to hatching of Atlantic salmon embryos. All sites recorded high spatial variability in survival. Minimum survival to hatching was zero at all sites. Maximum survival to hatching ranged from 35% to 91%. Mean survival to hatching ranged from 8·7% to 71%. Intra- and inter-site variations in rates of oxygen supply were observed. Generally, interstitial dissolved oxygen concentrations declined over the incubation period from a maximum recorded directly after redd creation, although localized fluctuations were recorded. Similarly, interstitial flow velocities declined over the incubation period from a maximum directly after redd creation to a minimum at hatching. With respect to the causes of embryo mortalities, oxygen supply was shown to be a stronger determinant of survival than interstitial oxygen concentration or interstitial flow velocity. To improve delineation of potential causes of embryo mortalities in the field, the statistical analysis was integrated within mass transfer theory of the processes controlling respiration to determine the likely mechanisms inhibiting respiration. Based on this analysis, mortalities were assessed to have resulted from periods of lethal oxygen concentrations, from periods of interstitial flow velocities that were insufficient to remove metabolic waste, or from combinations of oxygen concentration and interstitial flow that did not support respiratory requirements. A set of oxygen-supply-related thresholds for assessing incubation habitat quality are proposed.

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More information

Published date: 18 June 2007
Keywords: embryonic salmonid survival, oxygen concentration, interstitial flow velocity, habitat quality

Identifiers

Local EPrints ID: 56913
URI: http://eprints.soton.ac.uk/id/eprint/56913
ISSN: 1099-1085
PURE UUID: 899c81dd-c312-475c-9d99-a92fb98afe83
ORCID for D.A. Sear: ORCID iD orcid.org/0000-0003-0191-6179

Catalogue record

Date deposited: 11 Aug 2008
Last modified: 17 Jul 2017 14:30

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Contributors

Author: S.M. Greig
Author: D.A. Sear ORCID iD
Author: P.A. Carling

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