deepfishman case study 4: north east atlantic oceanic redfish
DESCRIPTION
DeepFishMan Case Study 4: North East Atlantic Oceanic redfish. IMR: Benjamin Planque, Kjell Nedreaas, Daniel Howell MRI: Klara Jakobsdóttir, Thorsteinn Sigurdsson,. Biological Background (1). ?. Biological Background (2). Slow growth, 50% mature at age 13, max age ~75. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: DeepFishMan Case Study 4: North East Atlantic Oceanic redfish](https://reader036.vdocuments.us/reader036/viewer/2022081519/5681451c550346895db1de98/html5/thumbnails/1.jpg)
DeepFishMan Case Study 4:North East Atlantic Oceanic
redfish
IMR: Benjamin Planque, Kjell Nedreaas, Daniel Howell
MRI: Klara Jakobsdóttir, Thorsteinn Sigurdsson,
![Page 2: DeepFishMan Case Study 4: North East Atlantic Oceanic redfish](https://reader036.vdocuments.us/reader036/viewer/2022081519/5681451c550346895db1de98/html5/thumbnails/2.jpg)
Biological Background (1)
?
![Page 3: DeepFishMan Case Study 4: North East Atlantic Oceanic redfish](https://reader036.vdocuments.us/reader036/viewer/2022081519/5681451c550346895db1de98/html5/thumbnails/3.jpg)
Biological Background (2)
Slow growth, 50% mature at age 13, max age ~75
![Page 4: DeepFishMan Case Study 4: North East Atlantic Oceanic redfish](https://reader036.vdocuments.us/reader036/viewer/2022081519/5681451c550346895db1de98/html5/thumbnails/4.jpg)
Biological Background (3)
• viviparous species, mating and larval extrusion take place in different time/areas,
• links between continental slope, Norwegian Sea and Barents Sea components are poorly known
• Maybe multiple stocks (Norwegian Sea, Barents Sea, Svalbard), but this is still largely unexplored
![Page 5: DeepFishMan Case Study 4: North East Atlantic Oceanic redfish](https://reader036.vdocuments.us/reader036/viewer/2022081519/5681451c550346895db1de98/html5/thumbnails/5.jpg)
The Fisheries•No directed trawl fishery•Bycatch limits•Pelagic fishery in international waters since 2004•Current landings around 10,000t
•Directed demersal and pelagic fishery•Current landings around 16,000t (deep-sea) and 17,000t (oceanic)
![Page 6: DeepFishMan Case Study 4: North East Atlantic Oceanic redfish](https://reader036.vdocuments.us/reader036/viewer/2022081519/5681451c550346895db1de98/html5/thumbnails/6.jpg)
some key issues
• S. mentella vs. S. marinus
• Stock identification of S. mentella
• connection between NEAtl & NWAtl stocks and fisheries
• Pelagic / Demersal components
![Page 7: DeepFishMan Case Study 4: North East Atlantic Oceanic redfish](https://reader036.vdocuments.us/reader036/viewer/2022081519/5681451c550346895db1de98/html5/thumbnails/7.jpg)
Data: 1. Catch statistics
• Catch: Catch statistics available 1986-2008 (except 1988), Russian data available prior to 1986
• Effort: Russian effort available 1975-2002 for 2 demersal trawler fleets (BMRT/PST), Norway effort needs to be collated, data available 1986-2008, Pelagic Fishery in Norwegian Sea (2006-), Standardised effort data (1988-) from Kaspersen (2008)
• Fleets: 2 Russian demersal fleets, Norway demersal factory trawler, international Pelagic fleet
• Catch/Effort/Landings in Iceland EEZ 1978-2008, logbook data by haul 1990-2008. Data prior to 1978 not split by species
![Page 8: DeepFishMan Case Study 4: North East Atlantic Oceanic redfish](https://reader036.vdocuments.us/reader036/viewer/2022081519/5681451c550346895db1de98/html5/thumbnails/8.jpg)
Data: 2. Biology
• Life cycle: Data readily available (with the limitations mentionned earlier)
• Biol. param: readily available• Stock structure: currently managed as one
unit. Morphometric and otolith shape analysis provide (yet) equivocal evidence.
• Ecology: some information on predators & preys (needs to be collated), long failure in recruitment still unexplained
![Page 9: DeepFishMan Case Study 4: North East Atlantic Oceanic redfish](https://reader036.vdocuments.us/reader036/viewer/2022081519/5681451c550346895db1de98/html5/thumbnails/9.jpg)
Data: 3. Biodiversity
• Bycatch: can be analysed from Pelagic fisheries logbooks and surveys since 2006, bycatch in the early stage of the Norwegian demersal fishery maybe extracted from Fiskeridirektoratet reports, Iceland logbook data (1990-2008)
• Benthos: see above• VMEs: see above• Fishing impact: ?• Ecosystem function: ?
![Page 10: DeepFishMan Case Study 4: North East Atlantic Oceanic redfish](https://reader036.vdocuments.us/reader036/viewer/2022081519/5681451c550346895db1de98/html5/thumbnails/10.jpg)
Data: 4. Economy
• Fish prices: 1988-2008 from Norwegian Seafood Export Council (Kaspersen, 2008)
• Fishing costs: 1988-2008 (Kaspersen, 2008, requires validation)
• Investment?
• All information for S. mentella and S. marinus combined.
![Page 11: DeepFishMan Case Study 4: North East Atlantic Oceanic redfish](https://reader036.vdocuments.us/reader036/viewer/2022081519/5681451c550346895db1de98/html5/thumbnails/11.jpg)
Data: 5. Social
• Unknown
![Page 12: DeepFishMan Case Study 4: North East Atlantic Oceanic redfish](https://reader036.vdocuments.us/reader036/viewer/2022081519/5681451c550346895db1de98/html5/thumbnails/12.jpg)
Data: 6. Assessment (1)
• Method used: no analytical assessment, XSA last tried in 2003. Current assessment is based in data from several surveys in the Barents Sea, Svalbard, and Norwegian slope and coast + recent data in the Norwegian Sea and catch statistics
• Length distribution: available• Catch@age: available (ALK)• CPUE: same as effort data
![Page 13: DeepFishMan Case Study 4: North East Atlantic Oceanic redfish](https://reader036.vdocuments.us/reader036/viewer/2022081519/5681451c550346895db1de98/html5/thumbnails/13.jpg)
Data: 6. Assessment (2)
• Survey data: back to 1980 depending on the surveys
• Model planned: Gadget• Possible bonus: Bayesian model (Aannes et
al 2007), XSA, proto-moments, others, tested using Gadget as an operational model >
Aanes, S., Engen, S., Sæther, B.-E., Aanes, R., 2007. Estimation of the parameters of fish stock dynamics from catch-at-age data and indices of abundance: can natural and fishing mortality be separated? Can. J. Fish. Aquat. Sci. 64, 1130-1142.
![Page 14: DeepFishMan Case Study 4: North East Atlantic Oceanic redfish](https://reader036.vdocuments.us/reader036/viewer/2022081519/5681451c550346895db1de98/html5/thumbnails/14.jpg)
Data: 7. Management
• Procedure: Assessment by ICES/AFWG, regulations set by Norwegian authorities in EEZ, by NEAFC in international waters.
• Regulation: Directed trawl fisheries for S. mentella is forbidden in EEZ north of 62N and in the Svalbard area. Bycatches regulated (i.e. 3 juvenile redfish per 10 kg shrimp, 15% max bycatch in trawl fishery, both redfish species combined). Area closures. Pelagic fishery in international waters is managed by NEAFC since 2007 and an agreed TAC of 10,500 t was set in 2009
![Page 15: DeepFishMan Case Study 4: North East Atlantic Oceanic redfish](https://reader036.vdocuments.us/reader036/viewer/2022081519/5681451c550346895db1de98/html5/thumbnails/15.jpg)
Deliverables
• Case study report• Data transfer towards WP3, WP4, WP5, WP6,
WP7• Gadget model development in WP4• Interaction with WP4-WP7
ICES links• Benchmark assessment planned in AFWG in
2011• Monitoring recommendations to
PGNEACS/PGRS
![Page 16: DeepFishMan Case Study 4: North East Atlantic Oceanic redfish](https://reader036.vdocuments.us/reader036/viewer/2022081519/5681451c550346895db1de98/html5/thumbnails/16.jpg)
![Page 17: DeepFishMan Case Study 4: North East Atlantic Oceanic redfish](https://reader036.vdocuments.us/reader036/viewer/2022081519/5681451c550346895db1de98/html5/thumbnails/17.jpg)
Overview surveys• 1st quarter:
– Joint Norw-Rus demersal (incl. Acoustics) winter survey Barents Sea (1986- )
• 2nd quarter:
– PGNAPES (2007- )
– Russian acoustic survey on spawning grounds-Kopytov area (1991-2000). Konstantin, incl. Those years covering Malang Bank-Spitbergen
– Norw. trawl-acoustic survey 62N-70N on spawning grounds (1992, 2009),
– Russian eggs- and larvae surveys, Lofoten-Kola, April-July (1959-1993),
– Some years with Norw. postlarvae surveys (1985-1990)
• 3rd quarter:
– Joint Norw-Rus Ecosystem survey (demersal incl. Acoustics) Barents Sea and Svalbard (2004- 2008), some years only Svalbard (1982-2002)
– 0-group (1965 -)
– International Norwegian Sea pelagic acoustic survey (2007 -)
• 4th quarter:
– Russian demersal survey Barents Sea and Svalbard (1982 -)
– Norw. trawl-acoustic survey 62N-70N (2008)