preliminary estimates of seabird bycatch in the alaskan halibut longline fishery in 2013
DESCRIPTION
Preliminary Estimates of Seabird Bycatch in the Alaskan Halibut Longline Fishery in 2013. Shannon M. Fitzgerald Jennifer Cahalan Jason Gasper Jennifer Mondragon. Estimated Annual Seabird Bycatch Alaskan Demersal Groundfish Fishery Cod and Turbot Freezer longliners, Sablefish catcher vessels. - PowerPoint PPT PresentationTRANSCRIPT
Preliminary Estimates of Seabird Bycatch in the Alaskan Halibut Longline Fishery in 2013
Shannon M. FitzgeraldJennifer CahalanJason GasperJennifer Mondragon
Estimated Annual Seabird BycatchAlaskan Demersal Groundfish Fishery
Cod and Turbot Freezer longliners, Sablefish catcher vessels
The Groundfish Fleet Freezer Longliners (Catcher Processors)
Targets = Pacific Cod and Greenland TurbotVast number of hooks annually and per vessel (fewer vessels)
Catcher Vessels (shoreside)Target = sablefish (black cod)Tub gear, fewer hooks annually and per vessel (many vessels)
Freezer Longliner
Auto-bait system
Typically over 124 ft length overall
100% Observer coverage
Ca. 20,000 hooks per day
Sablefish catcher vessels
Individual Fishing Quota
Tub gear – hand baited
Generally 30% observer coverage
Hundreds of hooks per day
Courtesy IPHC
In 2013 Observations begin on a % of the Pacific Halibut Fleet
“The last great unobserved fishery in the United States”
An historic fleet – some 100 yr old halibut schooners are still fishingCourtesy IPHC
We started in 1990 ---
How did we get to a Restructured Observer Program that included monitoring of Pacific Halibut dermersal longline vessels?
It started in 1990 ---
How did we get to a Restructured Observer Program that included monitoring of Pacific Halibut dermersal longline vessels?
TMI !
Similar to Sablefish fishery
Tub gear; hand baited
Smaller vessels, large fleet
Operating out of many Alaskan ports
Courtesy IPHC Courtesy IPHC
Individual handling of fish
Targeted coverage rate =
ca 12%
Realized coverage rate =
to be determined
For background information and updates visit the North Pacific Fishery Management Council websiteCourtesy IPHC
Longline Vessels
Observed hauls
Cod Sablefish Halibut
PRELIMINARY …. Estimates of Seabird Bycatch in the Alaskan Halibut Longline Fishery in 2013
Previous work -- Annual catch rates• Groundfish fishery
• Species-specific
differences among fisheries
• Inter-annual variability
• Must look at rates and total effort
Sablefish
0
0.02
0.04
0.06
2004 (1,278) 2005 (1,358) 2006 (1,386) 2007 (1,243)
OtherBFAL
LAALAlb Unid
ShearwaterGull
Fulmar
Turbot
0
0.02
0.04
0.06
2004 (448) 2005 (509) 2006 (456) 2007 (432)
Other
AlbatrossShearwater
GullFulmar
Cod
0
0.02
0.04
0.06
2004 (10,907) 2005 (10,165) 2006 (8,287) 2007 (6,345)
Other
AlbatrossShearwater
Gull
Fulmar
Bird
s / 1
,000
hoo
ks
Fishery total effort, by year and target
Cod freezer longliners (catcher processors) dominate overall effort
Halibut fishery observations begin in 2013
Overall seabird catch rates (birds per 1,000 hooks)
* * Possible anomaly in the data.
Catch rates (per 1,000 hooks) by seabird species groups…… vessel type, fishery target, and year
Largest fishery (cod freezer longliners) the bycatch is primarily fulmars, and also gulls, and shearwaters
Highest albatross catch rates are in the sablefish and halibut fisheries, but they have much lower effort overall
*
Estimated Total Seabird Bycatch
Bycatch total numbers are dominated by the Northern fulmar bycatch in the cod freezer longline fishery
Focus on sablefish and halibut fisheries
In our first year of comparison, the halibut fishery has lower bycatch than sablefish, and lower albatross bycatch
Areas of operation, gear, and fishing depth may account for these differences
Species/Species group
Fishery Albatross Fulmar Shearwater GullUnid./Other Total
Cod 4 2,483 127 425 264 3,303
Halibut 50 0 0 123 0 173
Sablefish 382 230 0 51 0 663Total 436 2,713 127 599 264 4,139
Seabird Bycatch Estimates* from the 2013 Alaskan longline fleets
* From the NOAA Alaska Regional Office Catch Accounting System
Fishery Target
Species
TotalLaysan Black-footed Short-tailed
Pacific Cod 4 0 0 4
Pacific Halibut 0 50 0 50
Sablefish 185 197 0 382
Total 189 247 0 436
Estimated bycatch of albatross in Alaskan demersal longline fleets -- 2013
AcknowledgementsFishery Monitoring and Analysis Division, Alaska Fisheries Science Center
Fisheries Observers, especially the first deployments to the halibut fleet
Vessel officers and crew
International Pacific Halibut Commission