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Methods for Image-based Surveys of Benthic Macroinvertebrates and Their Habitat Exemplified by the Drop Camera Survey for the Atlantic Sea Scallop
Published on: July 2, 2018
Surface trawl survey for U.S. origin Atlantic salmon Salmo salar
T F Sheehan1, M D Renkawitz, R W Brown
1National Marine Fisheries Service, Northeast Fisheries Science Center, Atlantic Salmon Research and Conservation Task, 166 Water Street, Woods Hole, MA 02543, USA. Tim.Sheehan@noaa.gov
Journal of Fish Biology
|July 26, 2011
Summary
Hatchery Atlantic salmon (Salmo salar) stocking location impacts early migration, but not long-term survival. Parr stocking is more significant than previously thought for population recovery.
Area of Science:
- Marine Ecology
- Fisheries Science
- Conservation Biology
Background:
- Investigating early marine dynamics of Atlantic salmon (Salmo salar) from modified river systems.
- Assessing the impact of stocking strategies on a hatchery-dependent population.
Purpose of the Study:
- Evaluate stocking location and time effects on Atlantic salmon migration success.
- Describe migratory pathways and environments utilized by post-smolts.
- Inform management actions for Salmo salar recovery.
Main Methods:
- Conducted a surface trawl survey from 2001-2005 in Penobscot Bay and the Gulf of Maine.
- Analyzed data to assess migration success and survival rates.
- Examined catch distribution to infer migratory pathways.
Main Results:
- Early migration success varied significantly by stocking group.
- Subsequent marine survival was independent of the initial stocking group.
- Parr stocking contributed a higher proportion to the population than anticipated.
- Identified an initial marine migratory pathway out of Penobscot Bay.
Conclusions:
- Stocking location and time influence early Atlantic salmon migration but not overall marine survival.
- Parr stocking is a crucial, underestimated strategy for population recovery.
- Predator refuge benefits in Penobscot Bay are likely minimal for post-smolts.
- Data can refine management strategies for Salmo salar recovery.
