Autopsy Report Seabirds killed and returned from the 20 0 8 -0 9 - - PowerPoint PPT Presentation

▶
autopsy report seabirds killed and returned from the 20 0
SMART_READER_LITE
LIVE PREVIEW

Autopsy Report Seabirds killed and returned from the 20 0 8 -0 9 - - PowerPoint PPT Presentation

Sep 07, 2023 238 likes •373 views

Autopsy Report Seabirds killed and returned from the 20 0 8 -0 9 fishing year David Thom pson Contract INT20 0 7/ 0 2 Sum m ary 38 5 specim ens returned, 28 taxa 1 blue penguin gaffed 75 trips, 62 vessels 60 % of specim

slide-1
SLIDE 1

Autopsy Report – Seabirds killed and returned from the 20 0 8 -0 9 fishing year

David Thom pson

Contract INT20 0 7/ 0 2

slide-2
SLIDE 2

Sum m ary…

  • 38 5 specim ens returned, 28 taxa
  • 1 blue penguin gaffed
  • 75 trips, 62 vessels
  • 60 % of specim ens XSH, XWC & XWM
  • 79% of specim ens 6 spp. (XBM, XGP & XSA)
  • 33 spotted shag, 32 from 1 trip
  • 9 black petrel
  • 4 m arked birds (1 XBP, 3 XYP)
slide-3
SLIDE 3

4

4

Yellow-eyed penguin 75

2 3 9 28 32 1

White-chinned petrel 67

3 9 14 17 14 6 4

White-capped albatross

33

Spotted shag 94

2 21 28 34 1 4 4

Sooty shearwater 27

10 2 1 11 2 1

Salvin’s albatross 10

1 2 6 1

Grey petrel 31

3 3 21 4

Buller’s albatross 9

8 1

Black petrel 9 8 7 6 5 4 3 2 1 12 11 10

Total

Month Species

slide-4
SLIDE 4

Birds returned…

  • 71% m ale, 23% fem ale
  • 95% XSH & 8 5% XWC m ale
  • 67% XGP fem ale
  • 92% adult
slide-5
SLIDE 5

10 20 30 40 50 60 70 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Percent

Grey petrel Sooty shearwater White-chinned petrel

slide-6
SLIDE 6

10 20 30 40 50 60 70 80 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

P ercen t

Buller's albatross Salvin's albatross White-capped albatross

slide-7
SLIDE 7

5 10 15 20 25 30 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

Birds Returned by Trip Frequency

slide-8
SLIDE 8

5 65 1 1 1 2

White-chinned petrel

1 29 4 43 8 2 3 2 7

% Total

4

Yellow-eyed penguin

17 43 4 1 2

White-capped albatross

33

Spotted shag

28 51 15

Sooty shearwater

11 10 1 3 2

Salvin’s albatross

4 1 5

Grey petrel

10 1 2 3 15

Buller’s albatross

8 1

Black petrel

Shark S. Other Scam pi Squid Hoki Other Snapper

  • D. Tuna
  • C. Tuna

Species

slide-9
SLIDE 9

10 0 10 0

78 12 73 67 10 0 67 38

Non- Albatross

22 8 8 27 33 33 62

Albatross

8 2 18 19 10 5 16 50

Total Deck Set N Net Warp N/ O Body Legs Wings Bill Trawl Longline – Hook/ Snood Species Group

Likely cause of death (%)

XWM: 31 warp, 33 net

slide-10
SLIDE 10

39 11 4 7 11 1 5 20

  • No. Birds

2

Discards + Nat

69 91 45 36 10

Discards

5

Bait + Discards Bat + Natural

10

Bait

9 2 5

Natural?

18 28 27 10 0 8 0 65

Em pty

14 23 36 20 5

No stom ach

Other Scam pi Squid Hoki Other Snapper

  • D. Tuna
  • C. Tuna

Stom ach Contents

Stom ach contents, albatrosses (%)

slide-11
SLIDE 11

Stom ach contents, non-albatrosses (%)

8 34 16 13 15 29

Discards

72 3 120 19 8 13 4 7

  • No. Birds

Bait + Discards

8 25

Bait + Natural

38 23 43

Bait

5 14

Sludge

51 67 16 32 25 15 50

Natural?

33 33 48 4 7 13 38 14

Em pty

4 3 13 25

No stom ach

Other Scam pi Squid Hoki Other Snapper

  • D. Tuna
  • C. Tuna

Stom ach Contents

slide-12
SLIDE 12

Identifications…

  • 66% correct
  • 9% incorrect (12 of 67 XWM as XSY)
  • 10 XSA and 10 XWM as XAL
  • 16% as ‘generic’ grouping, inc 32 XPP and

19 of 75 XWC

  • 4% no ID