# Presentation: 335018

## Update on groundfish stock trends for the Gulf of Alaska

- Sandra Lowe
- and James N. Ianelli
- Gulf of Alaska Groundfish
- Plan Team

**Update on groundfish stock trends ****for the Gulf of Alaska**

## Pollock

**Notes:**
The pollock slide shows average recruitment (818 million fish) for
2001 from the 1999 year class, rather than the estimated recruitment
value of 3.29 billion.  Average recruitment from the 1999 year class was
assumed in the projections to derive ABC, etc.

The Plan Team's pollock ABC has been reduced by the 1,700 mt Prince
William Sound GHL (groundfish harvest level).  This was taken out off
the top from the Shumagin, Chirikof, Kodiak and West Yakutat areas.

## ABC Summary

- Species

- 2002 ABC

- Change

**Pollock**

**58,250**

- Pacific Cod

- 57,600

- Flatfish

- 86,590

- Arrowtooth flounder

- 146,260

- Sablefish

- 12,820

- POP

- 13,190

- Northern rockfish

- 4,980

- Shortraker/Rougheye

- 1,620

- Other slope rockfish

- 5,040

- Pelagic shelf rockfish

- 5,490

- Demersal shelf rockfish

- 350

- Thornyheads

- 1,990

- Atka Mackerel

- 600

- Total

- 394,780

- Down 52,930 	(12%)

## Pollock ABC conservation adjustment

## Pollock ABC

**34% Lower than projected in 2000 (for 2002)**
- 21% due to change in biomass perception
- 13% due to additional conservation adjustment

## Pollock ABC

- Average 1999 year class

- 1999 year class
- as estimated

- Author's adjustment

- 53,490

- 78,520

- Maximum
- permissible

- 64,110

- 94,010

## Pollock

## Pollock Spawning biomass

**Spawning biomass (1,000’s tons)**
- 2002 	= 	158.3
- B40%	=	245
- B20%	=	123

## Pollock optimism?

## Pacific cod

## ABC Summary

- Species

- 2002 ABC

- Change

- Pollock

- 58,250

- Pacific Cod

- 57,600

- Flatfish

- 86,590

- Arrowtooth flounder

- 146,260

- Sablefish

- 12,820

- POP

- 13,190

- Northern rockfish

- 4,980

- Shortraker/Rougheye

- 1,620

- Other slope rockfish

- 5,040

- Pelagic shelf rockfish

- 5,490

- Demersal shelf rockfish

- 350

- Thornyheads

- 1,990

- Atka Mackerel

- 600

- Total

- 394,780

- Down 52,930 	(12%)

## P. Cod Spawning biomass

**Spawning biomass (1,000’s tons)**
- 2002 	= 	82
- B40%	=	85
- B20%	=	43

## Arrowtooth flounder

## Flatfish 2002 ABC’s86,590 tons total

## ABC Summary

- Species

- 2002 ABC

- Change

- Pollock

- 58,250

- Pacific Cod

- 57,600

- Flatfish

- 86,590

- Arrowtooth flounder

- 146,260

- Sablefish

- 12,820

- POP

- 13,190

- Northern rockfish

- 4,980

- Shortraker/Rougheye

- 1,620

- Other slope rockfish

- 5,040

- Pelagic shelf rockfish

- 5,490

- Demersal shelf rockfish

- 350

- Thornyheads

- 1,990

- Atka Mackerel

- 600

- Total

- 394,780

- Down 52,930 	(12%)

## Sablefish

## ABC Summary

- Species

- 2002 ABC

- Change

- Pollock

- 58,250

- Pacific Cod

- 57,600

- Flatfish

- 86,590

- Arrowtooth flounder

- 146,260

- Sablefish

- 12,820

- POP

- 13,190

- Northern rockfish

- 4,980

- Shortraker/Rougheye

- 1,620

- Other slope rockfish

- 5,040

- Pelagic shelf rockfish

- 5,490

- Demersal shelf rockfish

- 350

- Thornyheads

- 1,990

- Atka Mackerel

- 600

- Total

- 394,780

- Down 52,930 	(12%)

## Sablefish spawning biomass

**Spawning biomass (1,000’s tons)**
- 2002 	= 	193
- B40%	=	221

## Pacific ocean perch

## Slope Rockfish 2002 ABC’s24,830 tons total

## ABC Summary

- Species

- 2002 ABC

- Change

- Pollock

- 58,250

- Pacific Cod

- 57,600

- Flatfish

- 86,590

- Arrowtooth flounder

- 146,260

- Sablefish

- 12,820

- POP

- 13,190

- Northern rockfish

- 4,980

- Shortraker/Rougheye

- 1,620

- Other slope rockfish

- 5,040

- Pelagic shelf rockfish

- 5,490

- Demersal shelf rockfish

- 350

- Thornyheads

- 1,990

- Atka Mackerel

- 600

- Total

- 394,780

- Down 52,930 	(12%)

## Rockfish spawning biomass

**Spawning biomass (1,000’s tons)**
- POP:
- 2002 = 	107
- B40%	=	99
- Northern:
- 2002 = 	40
- B40%	=	23

## Pelagic shelf rockfish: biomass

- Dusky, widow, & yellowtail

**Notes:**
2)  Pelagic shelf rockfish - formally the dusky rockfish M was applied
to a 3 survey average biomass to come up with the complex ABC.  Now the
assessment appropriately partitions out dusky rockfish and considers
them in Tier 4, versus the other components - widow and yellowtail
rockfish, which are in Tier 5.  ABCs are computed separately for dusky
(F=M x ave. biomass) and for widow and yellowtail combined (0.75M x ave.
biomass).  The slide now shows the dusky ave. biomass and the widow and
yellowtail ave. biomass

## Pelagic shelf rockfish: catch

- Dusky, widow, & yellowtail

**Notes:**
2)  Pelagic shelf rockfish - formally the dusky rockfish M was applied
to a 3 survey average biomass to come up with the complex ABC.  Now the
assessment appropriately partitions out dusky rockfish and considers
them in Tier 4, versus the other components - widow and yellowtail
rockfish, which are in Tier 5.  ABCs are computed separately for dusky
(F=M x ave. biomass) and for widow and yellowtail combined (0.75M x ave.
biomass).  The slide now shows the dusky ave. biomass and the widow and
yellowtail ave. biomass

## ABC Summary

- Species

- 2002 ABC

- Change

- Pollock

- 58,250

- Pacific Cod

- 57,600

- Flatfish

- 86,590

- Arrowtooth flounder

- 146,260

- Sablefish

- 12,820

- POP

- 13,190

- Northern rockfish

- 4,980

- Shortraker/Rougheye

- 1,620

- Other slope rockfish

- 5,040

- Pelagic shelf rockfish

- 5,490

- Demersal shelf rockfish

- 350

- Thornyheads

- 1,990

- Atka Mackerel

- 600

- Total

- 394,780

- Down 52,930 	(12%)

## Demersal shelf rockfish

## ABC Summary

- Species

- 2002 ABC

- Change

- Pollock

- 58,250

- Pacific Cod

- 57,600

- Flatfish

- 86,590

- Arrowtooth flounder

- 146,260

- Sablefish

- 12,820

- POP

- 13,190

- Northern rockfish

- 4,980

- Shortraker/Rougheye

- 1,620

- Other slope rockfish

- 5,040

- Pelagic shelf rockfish

- 5,490

- Demersal shelf rockfish

- 350

- Thornyheads

- 1,990

- Atka Mackerel

- 600

- Total

- 394,780

- Down 52,930 	(12%)

## Thornyheads

## ABC Summary

- Species

- 2002 ABC

- Change

- Pollock

- 58,250

- Pacific Cod

- 57,600

- Flatfish

- 86,590

- Arrowtooth flounder

- 146,260

- Sablefish

- 12,820

- POP

- 13,190

- Northern rockfish

- 4,980

- Shortraker/Rougheye

- 1,620

- Other slope rockfish

- 5,040

- Pelagic shelf rockfish

- 5,490

- Demersal shelf rockfish

- 350

- Thornyheads

- 1,990

- Atka Mackerel

- 600

- Total

- 394,780

- Down 52,930 	(12%)

## Thornyhead spawning biomass

**Spawning biomass (1,000’s tons)**
- 2002 	= 	87
- B40%	=	78

## Summary by biomass

## Projected biomass by species4.48 million tons total

## Summary by ABC’s

## Projected ABC’s by species394 thousand tons total