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), 3087-3100. (doi:10.1002/hyp.6635).

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Original Publication URL: http://dx.doi.org/10.1002/hyp.6635

Description/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.

Item Type: Article
ISSNs: 0885-6087 (print)
Related URLs:
Keywords: embryonic salmonid survival, oxygen concentration, interstitial flow velocity, habitat quality
Subjects: G Geography. Anthropology. Recreation > G Geography (General)
G Geography. Anthropology. Recreation > GE Environmental Sciences
G Geography. Anthropology. Recreation > GB Physical geography
Divisions: University Structure - Pre August 2011 > School of Geography > Environmental Processes and Change
ePrint ID: 56913
Date Deposited: 11 Aug 2008
Last Modified: 27 Mar 2014 18:39
Contact Email Address: D.Sear@soton.ac.uk
URI: http://eprints.soton.ac.uk/id/eprint/56913

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