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Northern cod re-establish historical migration patterns linked to capelin: insights from pop-up satellite archival tags.
- Source :
-
Canadian Journal of Fisheries & Aquatic Sciences . 2024, Vol. 81 Issue 6, p646-669. 24p. - Publication Year :
- 2024
-
Abstract
- In May 2012–2015, 90 large (85–117 cm) Northern cod (Gadus morhua) with pop-up satellite archival tags (PSATs) set to release 1 year later were released from offshore spawning aggregations on the northeast Newfoundland shelf. Forty-nine (54%) transmitted or were recovered; 82% migrated inshore and 15% remained offshore (balance predated). Geo-locations were based on release, capture, and surfacing positions, and at tag-recorded depths <50 m, on Kalman-predicted light-based longitudes matched with coastal bathymetry. Migrating fish moved southwestward on average 5° longitude (350 km) and 2° latitude (222 km) to the northeast coast of Newfoundland, southern Labrador, and northern Grand Bank, as historically from similar release points. Migration onset through the Labrador Current (<0 °C) and arrival inshore were correlated with capelin (Mallotus villosus) peak spawning, inshore duration with capelin, and cod biomass. Both species were delayed a month from historical norms. The probability of a cod remaining inshore after 1 December was 50%, which could impact time-dependent surveys. Fishing exploitation was 6% and predation 5%. Northern cod have re-established historical spatial migration patterns, with capelin a key influence on timing and duration inshore. [ABSTRACT FROM AUTHOR]
- Subjects :
- *ATLANTIC cod
*SPAWNING
*BIOMASS
*MOVING average process
*LONGITUDE
Subjects
Details
- Language :
- English
- ISSN :
- 0706652X
- Volume :
- 81
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- Canadian Journal of Fisheries & Aquatic Sciences
- Publication Type :
- Academic Journal
- Accession number :
- 177719795
- Full Text :
- https://doi.org/10.1139/cjfas-2023-0172