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Unravelling the mysteries of the salmon at sea to promote their recovery


 

 

 


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2006 Inventory of Research Relating to
Salmon Mortality in the Sea

Listing of on-going research projects relating to salmon mortality in the sea by topic area

Topic Area
Objective/Issue Comments/examples Projects
1. Long-term monitoring
a. Time-series of marine survival/growth estimates Essential on-going tagging/monitoring programmes; require long-term national funding.

C3, E6, E9, E10, E13, E15, E19, E21, E22, I1, N3, N6, R1, U4

b. Time series of marine survival in relation to environmental parameters (e.g. SST) Desk studies on time series. E11, I2, I5, N8
2. Distribution/migration in the sea
a. Distribution of salmon in the sea Marine surveys of post-smolt distributions in NEAC and NAC areas; identification of fish caught (e.g. tagging, genetics). N4, U5
b. Migratory behaviour of individual fish Active smolt tracking; automated data collection by DSTs. C4, C5, C6, E14, E20, I4, I6, N5, U1, U2, U3
c. Origin of catches in directed fisheries Catch sampling in distant water fisheries; genetic analysis and scale analysis, etc; changes over time. D1, E8, E17, N7
d. Migration and bioenergetic models Desk studies based on data obtained from other studies. E2
e. By-catches in pelagic fisheries Can be conducted as part of marine surveys of post-smolt distributions; sample commercial pelagic catches. R2
3. Life history/biological processes
a. Freshwater factors Age, growth, migration timing, etc. E5
b. Pre-fishery-recruitment marine factors Environment, food, predation, growth, parasites and diseases, etc. C1, N1
c. Post-fishery-recruitment marine factors Environment, food, predation, maturation processes, growth, etc. E7
4. Development of methods
a. Post-smolt survey methods Development of trawls with cameras, tag detection, etc.  
b. Electronic tag technology Development of smaller/smarter/cheaper tags. I3
5. Specific natural and anthropogenic factors
a. Fish farms Increased sea lice infestations. E1, E16, E18, N2
b. Predation Predation by seals, birds, fish, etc. in estuaries/coastal areas. E12, U6
c. Obstructions to fish movements Barrages, etc. E3
d. Pollutants Acidification; freshwater contaminants. C2, E4