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Movements and habitat use by PIT-tagged Atlantic salmon parr in early winter: The influence of anchor ice

Freshwater Biology

By:
, , , ,
DOI: 10.1111/j.1365-2427.2004.01246.x

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Abstract

1. Movements and habitat use by Atlantic salmon parr in Catamaran Brook, New Brunswick, were studied using Passive Integrated Transponder technology. The fish were tagged in the summer of 1999, and a portable reading system was used to collect data on individual positions within a riffle-pool sequence in the early winter of 1999. Two major freezing events occurred on November 11-12 (Ice 1) and November 18-19 (Ice 2) that generated significant accumulations of anchor ice in the riffle. 2. Individually tagged parr (fork length 8.4-12.6 cm, n = 15) were tracked from 8 to 24 November 1999. Over this period, emigration (40%) was higher from the pool than from the riffle. Of the nine parr that were consistently located, seven parr moved <5 m up- or downstream, and two parr moved more than 10 m (maximum 23 m). Parr moved significantly more by night than by day, and diel habitat shifts were more pronounced in the pool with some of the fish moving closer to the bank at night. 3. During Ice 2, there was relatively little movement by most of the parr in the riffle beneath anchor ice up to 10 cm in thickness. Water temperature was 0.16??C above the freezing point beneath anchor ice, suggesting the existence of suitable habitats where salmon parr can avoid supercooling conditions and where they can have access to low velocity shelters. To our knowledge, these are the first data on habitat use by Atlantic salmon parr under anchor ice.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Movements and habitat use by PIT-tagged Atlantic salmon parr in early winter: The influence of anchor ice
Series title:
Freshwater Biology
DOI:
10.1111/j.1365-2427.2004.01246.x
Volume
49
Issue:
8
Year Published:
2004
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
1026
Last page:
1035
Number of Pages:
10