New Zealand fur seal demographics

Open Bay Islands, 1999

Mark-recapture estimate, 28–29 Jan 1999

Total marked
436
Mean estimate
624.5
Range
605.2 – 651.3

Mark-recapture counts

Count number Date Time Sector Unmarked count Marked count Dead marked Dead unmarked Total marked Cum. dead Estimate?
1 28 Jan 1999 17:10 – 17:11 Sector 1 - 2
28 Jan 1999 17:11 – 17:38 Sector 2 5 21
28 Jan 1999 17:46 – 17:56 Sector 3 31 27
28 Jan 1999 17:59 – 18:30 Sector 4 18 32
28 Jan 1999 18:32 – 18:56 Sector 5 11 62
28 Jan 1999 19:06 – 19:41 Sector 6 21 31
28 Jan 1999 19:59 – 20:13 Sector 7 16 31
All sectors 102 206 - - 436 - 651.3
2 29 Jan 1999 09:08 – 09:12 Sector 1 - 6
29 Jan 1999 09:13 – 09:35 Sector 2 3 37
29 Jan 1999 09:43 – 10:05 Sector 3 34 31
29 Jan 1999 10:28 – 10:52 Sector 4 22 44
29 Jan 1999 10:57 – 11:14 Sector 5 9 48
29 Jan 1999 11:22 – 12:03 Sector 6 16 38
28 Jan 1999 20:30 – 20:46 Sector 7 17 36
All sectors 101 240 1 - 435 1 618.7
3 29 Jan 1999 15:00 – 15:02 Sector 1 - -
29 Jan 1999 14:45 – 14:59 Sector 2 14 26
29 Jan 1999 14:25 – 14:43 Sector 3 24 25
29 Jan 1999 13:35 – 14:15 Sector 4 13 39
29 Jan 1999 13:08 – 13:32 Sector 5 5 46
29 Jan 1999 12:28 – 13:03 Sector 6 13 37
28 Jan 1999 20:59 – 21:14 Sector 7 20 37
All sectors 89 210 - - 435 1 619.9
4 29 Jan 1999 15:49 – 15:51 Sector 1 1 -
29 Jan 1999 15:52 – 16:10 Sector 2 5 30
29 Jan 1999 16:11 – 16:26 Sector 3 16 22
29 Jan 1999 16:33 – 17:16 Sector 4 18 37
29 Jan 1999 17:23 – 17:52 Sector 5 13 51
29 Jan 1999 17:58 – 18:40 Sector 6 14 44
28 Jan 1999 21:24 – 21:34 Sector 7 17 31
All sectors 84 215 1 - 434 2 605.2
5 29 Jan 1999 21:31 – 21:32 Sector 1 - 3
29 Jan 1999 21:18 – 21:31 Sector 2 3 19
29 Jan 1999 20:50 – 21:14 Sector 3 25 34
29 Jan 1999 20:13 – 20:46 Sector 4 22 41
29 Jan 1999 19:40 – 20:02 Sector 5 9 45
29 Jan 1999 19:05 – 19:37 Sector 6 23 50
28 Jan 1999 21:44 – 21:55 Sector 7 17 32
All sectors 99 224 - - 434 2 627.4

Dead count, 25–28 Jan 1999

Count
204

Dead counts

Date Sector Fresh Decomposing Dry Count
25–28 Jan 1999 Sector 1 - - 3 3
25–28 Jan 1999 Sector 2 2 1 9 12
25–28 Jan 1999 Sector 3 2 1 9 12
25–28 Jan 1999 Sector 4 2 3 28 33
25–28 Jan 1999 Sector 5 2 1 20 23
25–28 Jan 1999 Sector 6 4 3 47 54
25–28 Jan 1999 Sector 7 2 9 56 67
All sectors 14 18 172 204