ISSN:
1095-8649
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Biology
Notes:
Twenty adult returning salmon were tracked in the estuary of the R. Ribble using acoustic oxygensensing transmitters during summer when a pronounced dissolved oxygen (DO) sag develops. Excluding two mortalities, 75% of these fish left the estuary to sea. Fish in the estuary moved to and fro with the tides over a 10 km amplitude experiencing cyclical changes in DO. Fish movement was inhibited below 40% of air saturation value (ASV) DO, and there was evidence of avoidance of DO below 55% ASV. The high rate of loss of fish to sea suggests that many of the fish in the estuary are non-Ribble fish en route to other rivers. Adverse conditions in the Ribble therefore are likely to affect stocks in adjacent rivers.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1095-8649.1988.tb05567.x