DFO Pacific Outside North Hard Bottom Longline Surveys
Citation
Cornthwaite M (2021). DFO Pacific Outside North Hard Bottom Longline Surveys. Fisheries and Oceans Canada. Sampling event dataset https://doi.org/10.15468/r6rrca accessed via GBIF.org on 2022-05-22.Description
The Outside North Hard Bottom Longline (HBLL) survey is one of a set of long-term and coordinated surveys that together cover most of the nearshore, hard-bottom habitat of coastal British Columbia. The other surveys are the Outside South HBLL survey, Inside North HBLL survey, and Inside South HBLL survey. The Outside North HBLL survey was first conducted in 2006 and has been repeated every second year in alternate years to the Outside South HBLL survey, with the exception that no surveys were conducted in 2013. The objective of these surveys is to provide fishery-independent abundance indices and associated biological data for the assessment of nearshore rockfishes and other groundfish species that live on untrawlable, hard bottom habitats. The surveys follow a random depth-stratified design and the sampling units are 2 km by 2 km blocks. The Outside HBLL surveys use size 14/0 circle hooks, baited with frozen squid. The Outside North HBLL Survey is conducted by DFO in collaboration with the Pacific Halibut Management Association (PHMA) and takes place on several chartered commercial fishing vessels each year. This survey covers the northern portion of the British Columbia coastline, including the mainland coast north of Milbanke Sound, Dixon Entrance, and the east and west coasts of Haida Gwaii. The PHMA provides the chartered commercial fishing vessels and field technicians, while DFO provides support for running the surveys, including survey design and equipment. The data provided include information about the annual survey trips and fishing events (tows/sets) that are part of this survey series, including the vessel name, dates, times, spatial coverage, gear details, and effort information. Catch information (total weight in kg or counts of individual specimens) is included from successful fishing events. Catches are identified to species or to the lowest taxonomic level possible. Most catches are weighed, but some are too small (“trace” amounts) or too large (e.g. very large Big Skate). Some catches were subsampled and biological data were collected from individual fish specimens, including length, sex, and weight information. Where age structures were collected and processed, fish ages have been included.Sampling Description
Study Extent
The Outside North HBLL survey was first conducted in 2006 and has been repeated every second year in alternate years to the Outside South HBLL survey, with the exception that no surveys were conducted in 2013. This survey covers the northern portion of the British Columbia coastline, including the mainland coast north of Milbanke Sound, Dixon Entrance, and the east and west coasts of Haida Gwaii.Sampling
The surveys follow a random depth-stratified design and the sampling units are 2 km by 2 km blocks. The Outside HBLL surveys use size 14/0 circle hooks, baited with frozen squid.Quality Control
Scientific names associated with resource occurrence records have been mapped to recognized standards - marine taxa have been mapped to the World Register of Marine Species (WoRMS). The WoRMS codes, the AphiaIDs have been included as LSIDs in the occurrence record DwC field scientificNameID.Method steps
- This resource was created for OBIS Canada. Records were extracted from the Groundfish Biological Samples Database, GFBio (Groundfish Data Unit, Science Branch, Pacific Region, Fisheries and Oceans Canada) in DwC-A format and uploaded to the IPT using a combination of SQL and R. Scientific name matching with WoRMS was done using the R packages OBISTools and worrms and the R package RODBC was used to execute SQL procedures to extract the data.
Taxonomic Coverages
Catches are identified to species or to the lowest taxonomic level possible.
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Animaliarank: kingdom
Geographic Coverages
The northern British Columbia coast, excluding the inlets and protected waters east of Vancouver Island
Bibliographic Citations
- Page, L.M., Espinoza-Perez, H., Findley, L.T., Gilbert, C.R., Lea, R.N., Mandrak, N.E., Mayden, R.L., and Nelson, J.S.. 2013. Common and scientific names of fishes from the United States, Canada, and Mexico, 7th edition. American Fisheries Society, Special Publication 34, Bethesda, Maryland. 384 p. -
- Anderson, S.C., Keppel, E.A., Edwards, A.M. 2019. A reproducible data synopsis for over 100 species of British Columbia groundfsh. DFO Can. Sci. Advis. Sec. Res. Doc. 2019/041. vii + 321 p. - http://www.dfo-mpo.gc.ca/csas-sccs/Publications/ResDocs-DocRech/2019/2019_041-eng.html
- Doherty, B., Benson, A.J., Cox, S.P. 2019. Data summary and review of the PHMA hard bottom longline survey in British Columbia after the first 10 years (2006-2016). Can. Tech. Rep. Fish. Aquat. Sci. 3276: ix + 75 p - https://waves-vagues.dfo-mpo.gc.ca/Library/40771118.pdf
Contacts
Maria Cornthwaiteoriginator
position: Head, Groundfish Data Unit
Fisheries and Oceans Canada
3190 Hammond Bay Road
Nanaimo
V9T6N7
British Columbia
CA
email: maria.cornthwaite@dfo-mpo.gc.ca
userId: http://scholar.google.com/citations?user=ajmbOKgAAAAJ&hl=en
Maria Cornthwaite
metadata author
position: Head, Groundfish Data Unit
Fisheries and Oceans Canada
3190 Hammond Bay Road
Nanaimo
V9T6N7
British Columbia
CA
email: maria.cornthwaite@dfo-mpo.gc.ca
userId: http://scholar.google.com/citations?user=ajmbOKgAAAAJ&hl=en
Maria Cornthwaite
administrative point of contact
position: Head, Groundfish Data Unit
Fisheries and Oceans Canada
3190 Hammond Bay Road
Nanaimo
V9T6N7
British Columbia
CA
email: maria.cornthwaite@dfo-mpo.gc.ca
userId: http://scholar.google.com/citations?user=ajmbOKgAAAAJ&hl=en
Greg Workman
administrative point of contact
position: Head, Groundfish Section
Fisheries and Oceans Canada
3190 Hammond Bay Road
Nanaimo
V9T 6N7
British Columbia
CA
email: Greg.Workman@dfo-mpo.gc.ca