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29
New collections and new insight for Pacific lamprey in marine waters Laurie Weitkamp NWFSC-Newport, NOAA Fisheries and Sam Graf Middlebury College

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Page 1: New collections and new insight for Pacific lamprey in ......New collections and new insight for Pacific lamprey in marine waters Laurie Weitkamp NWFSC-Newport, NOAA Fisheries. and

New collections and new insight for Pacific lamprey in marine waters

Laurie WeitkampNWFSC-Newport, NOAA Fisheries

and Sam GrafMiddlebury College

Page 2: New collections and new insight for Pacific lamprey in ......New collections and new insight for Pacific lamprey in marine waters Laurie Weitkamp NWFSC-Newport, NOAA Fisheries. and

Today’s talk• Quick summary of NOAA Fishery/NWFSC lamprey results

• NWFSC surveys that catch lamprey• Fish species with lamprey wounds

• New marine collections of Pacific lamprey• Methods• Size and growth• Distribution• Gut fullness

• Summary and conclusions• Next steps

Photo Credit: West Coast Observer Program

Page 3: New collections and new insight for Pacific lamprey in ......New collections and new insight for Pacific lamprey in marine waters Laurie Weitkamp NWFSC-Newport, NOAA Fisheries. and

NWFSC marine fish surveys

Hake survey- Big surveys in odd years - 2019: 65 days sea time- 50-110 midwater trawlsGroundfish survey- US-Canada to US-Mexico- Two passes every year - 600-700 bottom trawlsPelagic (juv. Salmon) surveys- May, June- Newport to C. Flattery - On shelf (<300 m depth)- 100 Surface trawls

Catches the most Pacific lamprey

Highest diversity of lamprey wounds

Catches the most western river lamprey

Hake survey < i ---

Grou dfis su vey <~--

Page 4: New collections and new insight for Pacific lamprey in ......New collections and new insight for Pacific lamprey in marine waters Laurie Weitkamp NWFSC-Newport, NOAA Fisheries. and

• Hake survey was able to PIT tag single lamprey in 2017 and 2018 • (no subsequent detections yet)

• Will send out more PIT tags during 2019 survey (65 sea days!)

Hake survey provides opportunity to tag lamprey

with PIT tags

Page 5: New collections and new insight for Pacific lamprey in ......New collections and new insight for Pacific lamprey in marine waters Laurie Weitkamp NWFSC-Newport, NOAA Fisheries. and

Lamprey wounds from Groundfish survey

Page 6: New collections and new insight for Pacific lamprey in ......New collections and new insight for Pacific lamprey in marine waters Laurie Weitkamp NWFSC-Newport, NOAA Fisheries. and

New Pacific lamprey collections

Source Year Number of lamprey

At-sea commercial hake observer program (ASHOP)

20172018

670Lots*

Commercial shrimp fishery 20172018

162

Groundfish survey 2017 4Total >700

* Not processed yet (more to come)

Caveat: Some patterns likely reflect the influence of fishing

effort /IND lamprey biology

Page 7: New collections and new insight for Pacific lamprey in ......New collections and new insight for Pacific lamprey in marine waters Laurie Weitkamp NWFSC-Newport, NOAA Fisheries. and
Page 8: New collections and new insight for Pacific lamprey in ......New collections and new insight for Pacific lamprey in marine waters Laurie Weitkamp NWFSC-Newport, NOAA Fisheries. and

Methods• Lamprey were measured for:

• Length (mm) & weight (g)• Intestine weight (g)• Oral disc diameter*• Distance between dorsal fins*• Moisture content (proxy for lipids)*• No. of gill openings (L, R)

• Samples collected/retained: • fin clips• Intestines• Bodies and heads (for statoliths)

• Catch information • date of capture• latitude/longitude • fishing & bottom depth

*Subsampled

Page 9: New collections and new insight for Pacific lamprey in ......New collections and new insight for Pacific lamprey in marine waters Laurie Weitkamp NWFSC-Newport, NOAA Fisheries. and

Methods• Lamprey were measured for:

• Length (mm) & weight (g)• Intestine weight (g)• Oral disc diameter*• Distance between dorsal fins*• Moisture content (proxy for lipids)*• No. of gill openings (L, R)

• Samples collected/retained: • fin clips• Intestines• Bodies and heads (for statoliths)

• Catch information • date of capture• latitude/longitude• fishing & bottom depth

*Subsampled

Today’s [preliminary]

results:• size and

growth• distribution• gut fullness

Page 10: New collections and new insight for Pacific lamprey in ......New collections and new insight for Pacific lamprey in marine waters Laurie Weitkamp NWFSC-Newport, NOAA Fisheries. and

Size of lamprey by

date and source Total length (mm

)

Total weight (g)

Date

Date

I-' N w .i,,. \.11 CTI -.J

0 0 0

0 0

0 0

0 0

0 0 8 0

0

1-May

1 I 11-May -- .. ~ ~ -

21-May l t,. • I•• • I

• · I-J .. ~ ..

'• I ' 31-May •

I .. i• - .>.

r t

10-Jun ~ • 1- . ~ • I • ' a . , t

20-Jun • <>- + • ~ • • I I

30-Jun ; ~ ' t· I

10-Jul • ~ ~

t> □ • 20-Jul I "- ~ ,~~iiTI

::!. 0 ~ 3 C (1)

30-Jul I ::i ...... . ~ ~ l~Q:;;:;;·I

- - - - -::r 1/) 1/) (1)

9-Aug I .. ~- + lj ; -< I ~

19-Aug __,.

□ I ~ I 29-Aug ~ ♦ .. ,

f I

8-Sep •- ... .. I I I i t l 18-Sep • .. - ... ' • I l 28-Sep ! L l

j ' I

I

8-0ct I- 1· -r - ... - t L • • • 18-Oct I • - .. -r ·•· ... ~- i ~ t I

. •-: f I

28-Oct 1 • ~ ~ I

7-Nov l

n

1-May

11-May

21-May

31-May

10-Jun

20-Jun

30-Jun

10-Jul

20-Jul

30-Jul

9-Aug

19-Aug

29-Aug

8-Sep

18-Sep

28-Sep

8-Oct

18-Oct

28-Oct

7-Nov

f-" N W .i,,. \.11 CTI -.J 00

8 8 8 8 8 8 8 8

, -. I • . t · . •-• : ! f • I :.

~ - • 1 •

• • • t> □ • V> G) I -:::s- -, 0.)

:l. 0 ~ 3 § ...,

--0 Q:; ;;;· ~ -- -:::s-1/) 1/) (1) -:::s- -:::s- -, (1) 1/) -< -< C ..,

< (D

-<

• •••

-.­•

I>

• • • • ~ 1

Page 11: New collections and new insight for Pacific lamprey in ......New collections and new insight for Pacific lamprey in marine waters Laurie Weitkamp NWFSC-Newport, NOAA Fisheries. and

Size of lamprey by

date and source Total length (mm

)

Total weight (g)

Date

Date

.... N VJ .j::,, V, en "-.J

0 0 0

0 0

0 0

0 0

0 0 8 0

0

1-May

1

1-May I

11-May · - - -~ -~ I ! r-~ 11-May t. . I·. • 21May ~ • • ; •:•i t I

I e-

28-Sep

' 8-0ct ' _ , __ - t------- t ~ 8-0ct

-- • i. 1 I 18-0ct . ~ ----- -r · • · - • -• ! 18-0ct

28-0ct • . ~ ~- . ~- .. 28-0 ct I I

I L__ 7-Nov ,. 7-Nov

I-" N VJ

0 0 0 o,-.e 0

0

ll \.-.j::,, V, en "-.J 00 0 0

0 0

0 0

0 0

0 0

I

' •• r • • t - +-

• • •

• •

• • •

• •

□ • u, G) I ;:r -, Ill

-, 0 " ~f § ~ -0 S; iii. ~ -· ::r V, (I) (II

ff ~-< -< ~

< (II

-<

Page 12: New collections and new insight for Pacific lamprey in ......New collections and new insight for Pacific lamprey in marine waters Laurie Weitkamp NWFSC-Newport, NOAA Fisheries. and

Size and grow

thTotal length (m

m)

Big (headed home?)

Medium

(spent a winter

in marine w

aters?)

Smalls=recent arrivals?

Three sizes of lamprey in spring?

Date

I-" N VJ .i,. U1 en --..J 00

0 0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

1-May

11-May

21-May

31-May

10-Jun

20-Jun

30-Jun I ~-"1 ' ..... c □ • 10-Jul

,_ V'l_ G) :c

-, Q)

0 7'

20-Jul r • i ~ C (!) 1. J ::I .....

I Q.. -• - ..... (/) -- , -· ::,

30-Jul I t t- I Vl (/) (!) ::r ::T -, (I) (/) -< ;J C

9-Aug ~ ~ ~

I ~ 19-Aug t t D

- -29-Aug -~ • • 8-Sep I

ii► •

18-Sep I

• 28-Sep

8-Qct I - ,.- -1 ~ • I • • I

18-Oct I t· -- I ·•- • 1-. - t-

28-Oct I ;. ... i I i .•

7-Nov

Page 13: New collections and new insight for Pacific lamprey in ......New collections and new insight for Pacific lamprey in marine waters Laurie Weitkamp NWFSC-Newport, NOAA Fisheries. and

Size and grow

thTotal length (m

m)

Date

Two sizes of lam

prey in fall?

Larges (getting ready to home?)

Smalls: spent the sum

mer in

the ocean1-May

11-May

21-May

31-May

10-Jun

20-Jun

30-Jun

10-Jul

20-Jul

30-Jul

9-Aug

19-Aug

29-Aug

8-Sep

18-Sep

28-Sep

8-0ct

18-0ct

28-0ct

7-Nov

0

I-" N

8 8

• • •

• •

~ • •

{],

en --..i 00

8 8 8

•• I O ;

: t • •

'°'

t> □ • V'l G) :c :::r -, Q) -, 0 7' -· (1) 3 § ....,

"O a. jj;' ~ ::!'? ::r ..,, (/) (1) :::r :::r -, (1) (/) -< -< ~

< (1)

-<

Page 14: New collections and new insight for Pacific lamprey in ......New collections and new insight for Pacific lamprey in marine waters Laurie Weitkamp NWFSC-Newport, NOAA Fisheries. and

Size and grow

thTotal length (m

m)

Date

Assumed grow

th over time …

.

I-" N VJ .i,. U1 en --..J 00

0 0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

1-May

11-May

21-May

31-May

10-Jun

20-Jun

30-Jun I - -- I -

■ • • I □ • 10-Jul ,. I ■ IV>G):c

.... Q) 0 7'

20-Jul r • ■ • t• l • 1.g g_ ~ .......... (/) -· -· ::, 30-Jul I t ••· l. I. I~~~ (1) (/) -<

9-Aug t ~ ~ ~ t~ l< l 19-Aug

29-Aug I • - ... -

8-Sep 1 I I .. " • I l •

18-Sep I • I I I • I

28-Sep

a-oct I - ,- \-'.• · I\I• I • • I • 18-Oct

28-Oct

7-Nov

Page 15: New collections and new insight for Pacific lamprey in ......New collections and new insight for Pacific lamprey in marine waters Laurie Weitkamp NWFSC-Newport, NOAA Fisheries. and

Hypothesized seasonal grow

th of Pacific lam

prey in marine w

aters (assum

es repeatedly sampling the sam

e population)

1stsum

mer

1stw

inter2nd sum

mer

2nd winter

3rd sum

mer

Date

Total length (mm)~ N w .i::,. tn O') ...... co 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

1-May

-31-May -- - _I_ - . - -------- ~ VI rt

30-Jun - -- - - - _I. -- ____._ ___ V,

- L - -'~ -C

30-Jul - -• - - . 3 29-Aug ~ .0 . 3

m 28-Sep ~ r - .

' 28-Oct

27-Nov ~

27-Dec ~ F -· f - - ~ · ' i 26-Jan

25-Feb . - 1 -- - - ~- - r - ""----' - -- -'" - ---- ~

27-Mar ' 26-Apr

26-May - J _j \& - -r - - - ___.._ ___ N ::J

2 5-J un ... r

t a.

25-Jul V,

... r r . C

24-Aug - - 0 3 l o o o 3 23-Sep - - L- - - --.- 0 m -l J_ -- 0 6>o'o ' 23-Oct

22-Nov ·---· - ' - ---r --~ - - ---- 1 N

22-Dec ~ - _ _,___ --- - ~- - r - ""----"- -- -'" - ---- I g_ 21-Jan _ T _ 1 _ . -1" - - . -~-- :E 20-Feb ::J

~ -: ~ ~ ~ -J ~ ~ _- _-'" ~ ~: ~ - r-t-m

22-Mar ' 21-Apr

l I I ~o V, w

21-May

i- -- r C ' a O o o ,§ a.

20-Jun - - r - --

m '

Page 16: New collections and new insight for Pacific lamprey in ......New collections and new insight for Pacific lamprey in marine waters Laurie Weitkamp NWFSC-Newport, NOAA Fisheries. and

Hypothesized seasonal grow

th of Pacific lam

prey in marine w

aters (assum

es repeatedly sampling the sam

e population)

1stsum

mer

1stw

inter2nd sum

mer

2nd winter

3rd sum

mer

Date

0.44 mm

/d0.15 g/d

0.33%BW

/d

0.32 mm

/d0.14 g/d

0.13%BW

/d

1.7 mm

/d2.3 g/d

0.57%BW

/d

0.37 mm

/d0.46 g/d

0.05%BW

/d

Total length (mm)~ N w .i::,. tn O') ...... co 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

1-May

31-May - _I_ - . - -------- ~ VI rt

30-Jun - - - _I. -- ____._ ___ V,

C 30-Jul -- - - -• - - . 3

29-Aug . 3 0 m

28-Sep r - . '

28-Oct

27-Nov ~

27-Dec ·· ~.·. F \' ·. f ~ ~ ~ - . - - -- ' i 26-Jan

25-Feb . - 1 -- - - ~- - r - ""----' - -- -'" - ---- ~

27-Mar ' 26-Apr

26-May - J -1 ~ - r ~-- N ::J

2 5-J un ... r a.. 25-Jul

V, ... r . C

24-Aug - - L- - [ - --.- 0

0 3 3

23-Sep _ l -1 ___ o m

0 'o ' 23-Oct

22-Nov ·---· - ' - ----r --~ - - ---- 1 N

22-Dec ~ - --=--- ---4- - ~- - r - ""----" -\•- -'" - ---- I g_ 21-Jan -T-I -. -1" - \ " -~-- :E 20-Feb ::J

~ -~ ~ ~ ~ -J ~ ~ - -'" ~ ~:~- r-t-m

22-Mar ' 21-Apr

l I I ~ o V, w

21-May

i- -- r C ' a O o o ,§ a..

20-Jun - - r - --

m '

Page 17: New collections and new insight for Pacific lamprey in ......New collections and new insight for Pacific lamprey in marine waters Laurie Weitkamp NWFSC-Newport, NOAA Fisheries. and

Hypothesized seasonal grow

th of Pacific lam

prey in marine w

aters (assum

es repeatedly sampling the sam

e population)

1stsum

mer

1stw

inter2nd sum

mer

2nd winter

3rd sum

mer

Date

Total length (mm)

0.59 mm

/d0.62 g/d

0.21%BW

/d

Sea lamprey growth rates

0.65-0.79 g/d W A

tlantic0.89 g/d Great Lakes

First ever estimate of m

arine growth rate for Pacific lam

prey and

independent confirmation that 2-3 years in

marine waters is reasonable (Beam

ish 1990)

~ N w .i::,. tn O') ...... co 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

1-May

31-May ~ VI rt

30-Jun V,

C 30-Jul 3

29-Aug 3 m

28-Sep ' 28-Oct

27-Nov ~

27-Dec VI rt

26-Jan ~ :::J

25-Feb ,-+

m 27-Mar ' 26-Apr

26-May N :::J

2 5-J un a. 25-Jul

V,

C

24-Aug 3 3

23-Sep m ' 23-Oct

22-Nov 1 I N

22-Dec I I g_ 21-Jan ~

20-Feb :::J ,-+

m 22-Mar ' 21-Apr

V, w 21-May C ' 3 a. 20-Jun 3

m '

Page 18: New collections and new insight for Pacific lamprey in ......New collections and new insight for Pacific lamprey in marine waters Laurie Weitkamp NWFSC-Newport, NOAA Fisheries. and

Distribution of lampreyGiven likely freshwater sources of Pacific lamprey, I expected that:• Lamprey would be clustered around major river mouths

(Chehalis, Columbia, Umpqua, Rogue, Klamath), especially:• shortly after ocean entry in spring• immediately before re-entry to freshwater in fall

• Higher densities around biggest rivers (Columbia)• Dispersed at other times of year

Page 19: New collections and new insight for Pacific lamprey in ......New collections and new insight for Pacific lamprey in marine waters Laurie Weitkamp NWFSC-Newport, NOAA Fisheries. and

Map by C. Morgan, OSU

Distribution of lamprey: expectationsSmall lamprey

springSmall lamprey

fallBig lamprey

springBig lamprey

fall

Clumped at river mouths

Dispersed Dispersed Clumped at river mouths

Umpqua

Rogue

Klamath

Umpqua

Rogue

Klamath

Umpqua

Rogue

Klamath

Umpqua

Rogue

Klamath

0 ,,,

47° N

46° N

45° N Oregon Oregon Oregon Oregon

California California California California

12s· w 124• w 123• w 122· w12s· w 124• w 123• w 122° w12s· w 124° w 123° w 122° w12s· w 124° w 123° w 122° v

Page 20: New collections and new insight for Pacific lamprey in ......New collections and new insight for Pacific lamprey in marine waters Laurie Weitkamp NWFSC-Newport, NOAA Fisheries. and

Map by C. Morgan, OSU

Distribution of lamprey: reality

Clumped at river mouths

Dispersed Dispersed Clumped at river mouths

Small lampreyspring

Small lampreyfall

Big lampreyspring

Big lampreyfall

Maybe?! Kinda Yes!No!!!

Umpqua

Rogue

Klamath

Umpqua

Rogue

Klamath

Umpqua

Rogue

Klamath

Umpqua

Rogue

Klamath

Complication: Observed distributions are influenced by fishing (=sampling) effort

which affects observations

Complication

43° N

42° N {\t \1

41 ° N1-+---'-........L!-....,___ _____ --1- --''---L------.-~-------+- +-----.-'-....i,...--r------r------,.----I- --l--'------.-.....l!....,___ _____ -+-

California California California California

1250 W 124° W 123° W 122° W125° W 124° W 123° W 122° W125° W 124° W 123° W 122°W 125° W 124° W 123° W 122° v

Page 21: New collections and new insight for Pacific lamprey in ......New collections and new insight for Pacific lamprey in marine waters Laurie Weitkamp NWFSC-Newport, NOAA Fisheries. and

Expectations for feeding success and gut fullness

Expect that feeding success and therefore gut fullness would be in order of:

1. Lamprey caught with hake (preferred host)2. Lamprey caught by the groundfish survey

(lots of likely hosts)3. Lamprey caught by the shrimp fishery (not

parasitizing shrimp)

High

Low

Gut fullness (%BW) = 100x Gut wt (g)

Fish wt (g)- gut wt (g)

Page 22: New collections and new insight for Pacific lamprey in ......New collections and new insight for Pacific lamprey in marine waters Laurie Weitkamp NWFSC-Newport, NOAA Fisheries. and

Gut fullness by fishery didn’t match expectations

Lamprey length vs. gut fullness Gut fullness by fishery

Fishery

Gut f

ulln

ess (

% B

W)

Lamprey caught by shrimp fishery fat and happy after a

big meal on hake?

30 10.0 • 9.0

25 8.0

! 7.0

6.0 -V'l V'l (lJ C

5.0

::J 4.0 LL

•• • 3.0

5 • 2.0 • .:::1, 1.0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.0 0 U") 0 U") 0 U") 0 U") 0 U") 0 U") 0 Hake Groundfish Shrimp .-I .-I N N (Y) (Y) ,;:f" ,;:f" U") U") l.D l.D r--,..

Length (mm)

Page 23: New collections and new insight for Pacific lamprey in ......New collections and new insight for Pacific lamprey in marine waters Laurie Weitkamp NWFSC-Newport, NOAA Fisheries. and

Summary and conclusions

• New marine collections provide new insight on Pacific lamprey marine ecology, such as ….

• Provide first estimates of ocean growth rates

• 2-3 years in the ocean is probably correct

• Lamprey aren’t clumped in front of major river mouths but widely dispersed in ocean

• Lamprey caught by shrimp fishery didn’t have low gut fullness

• resting on bottom after gorging on hosts?

Photo Credit: West Coast Observer Program

Page 24: New collections and new insight for Pacific lamprey in ......New collections and new insight for Pacific lamprey in marine waters Laurie Weitkamp NWFSC-Newport, NOAA Fisheries. and

Next steps• See if patterns repeated with extensive 2018 collections

(not processed yet)• Determining host preferences

• eDNA of gut contents (Hampton University)• Pilot project: use trophic biomarkers (fatty acids and stable

isotopes) to determine feeding histories

• Compile data on fish with lamprey wounds• Put this data in the context of the whole life cycle

Comparisons with lamprey before ocean entryComparison with lamprey after freshwater re-enty

Page 25: New collections and new insight for Pacific lamprey in ......New collections and new insight for Pacific lamprey in marine waters Laurie Weitkamp NWFSC-Newport, NOAA Fisheries. and

Acknowledgements

• West Coast Fishery Observer Program• Vanessa Tuttle, Ryan Shama, Jen Cramer• Many fishery observers who collected and recorded lamprey for us

• NWFSC Groundfish and Hake survey staff• Dan Kamikawa, Alicia Billings

• AFSC Groundfish survey staff• Nancy Robertson

• Sam Graf (Middlebury College)• Did all the lamprey necrospies

• Sam G af

Page 26: New collections and new insight for Pacific lamprey in ......New collections and new insight for Pacific lamprey in marine waters Laurie Weitkamp NWFSC-Newport, NOAA Fisheries. and

Questions?

Photo Credit: West Coast Observer Program

Still life with lamprey

Page 27: New collections and new insight for Pacific lamprey in ......New collections and new insight for Pacific lamprey in marine waters Laurie Weitkamp NWFSC-Newport, NOAA Fisheries. and

Fishing depth is less variable than bottom depth

Fishing depth (m)

Bottom depth (m)

Small Lamprey Large Lamprey

Lamprey length (mm) Lamprey length (mm)

600 600 • Spring

■ • Fall 500

■ Spring 500 ■

~ Fall .. • 400 • 400 0

• • 0

300 300 ■ ■ Oo 0 t 0 ■

0 o•■ ■ ■ 200 200 ■ ■

■ 'I. 0

100 ...... 100 •• ~•. ~ • • 0 0

100 150 200 250 300 200 300 400 500 600 700 800

1,400 1,400 • Spring

1,200 • • • • Fall 1,200 ■ Spring

• ..... o Fall 1,000 • ~~· 1,000 ..... =•• .. . ,.

800 • ~!:t •_r 800 ■ ■

600 ••• :;,t .. - ••• 600 ■ • • ■ ■ • •• 111111 ■

■ ■ I 400 400 oO~ 0 0 ■

■ 0

200 200 , • ■

0 0 100 150 200 250 300 200 300 400 500 600 700 800

Page 28: New collections and new insight for Pacific lamprey in ......New collections and new insight for Pacific lamprey in marine waters Laurie Weitkamp NWFSC-Newport, NOAA Fisheries. and

Timing of lamprey in the Columbia

River estuary(Weitkamp et al. 2015)

• Highest adultdensities in late winter (=timing of freshwater re-entry

• Highest juveniledensities in mid winter (=timing of ocean entry)

Pacific lamprey juveniles

Pacific lamprey adults

....._ N

E 0.20 0 0 0 0-

0.15 ..... --ci 5 .c 0.10 '1ii C Q) -0 C 0.05 C1l Q)

2

0.00

....._ 3.00 N

E 0 0 0

0.50 0-..... --0 0.40 5 £ 0.30 CJ) C 0.20 Q) -0 C 0.10 C1l Q)

2 0.00

....._ 1.20 N

River lamprey E 0 0

1.00 0 0-

0.80 ..... --0 5 0.60 £ CJ) 0.40 C Q) -0 C 0.20 C1l Q)

2 0.00 C .D

,._ ,._ >,

C1l Q) C1l 0.. C1l --, LL ~ <l'. ~

I. I \ \ \

C :i ::J --, --,

Month

o..c:515~ ~ 0 z o

-o-CREDDP Trawl

-o-- CREDDP Purse seine

- -• - EPS Purse seine

Page 29: New collections and new insight for Pacific lamprey in ......New collections and new insight for Pacific lamprey in marine waters Laurie Weitkamp NWFSC-Newport, NOAA Fisheries. and

Alaska Fishery Science Center surveys that catch Pacific lamprey

Bering Sea slope survey discontinued in 2017

(Pacific lamprey = Orange circles and green triangles)

Bering slope survey

Gulf of Alaska survey

UNITED STAT~S r.