New Zealand fur seal demographics

Wekakura Point, 1998

Mark-recapture estimate, 29–30 Jan 1998

Total marked
688
Mean estimate
1048.5
Range
1019.8 – 1130.7

Mark-recapture counts

Count number Date Time Sector Unmarked count Marked count Dead marked Dead unmarked Total marked Cum. dead Estimate?
1 30 Jan 1998 07:05 – 07:17 Headland 1 25 105
29 Jan 1998 15:53 – 16:14 Headland 2 66 115
29 Jan 1998 15:42 – 15:53 Headland 3 54 75
All sectors 145 295 - - 688 - 1025.5
2 30 Jan 1998 07:32 – 07:42 Headland 1 17 78
29 Jan 1998 16:29 – 16:54 Headland 2 55 117
29 Jan 1998 16:08 – 16:26 Headland 3 59 76
All sectors 131 271 - - 688 - 1019.8
3 30 Jan 1998 07:57 – 08:09 Headland 1 15 87
29 Jan 1998 17:09 – 17:41 Headland 2 68 76
29 Jan 1998 16:41 – 17:05 Headland 3 77 85
All sectors 160 248 - - 688 - 1130.7
4 30 Jan 1998 08:24 – 08:37 Headland 1 12 88
29 Jan 1998 17:55 – 18:24 Headland 2 58 100
29 Jan 1998 17:20 – 17:42 Headland 3 56 61
All sectors 126 249 - - 688 - 1035.3
5 30 Jan 1998 08:52 – 09:05 Headland 1 10 76
29 Jan 1998 18:39 – 19:04 Headland 2 56 108
29 Jan 1998 17:57 – 18:18 Headland 3 60 68
All sectors 126 252 - - 688 - 1031.1

Dead count, 26–28 Jan 1998

Count
11

Dead counts

Date Sector Fresh Decomposing Dry Count
26–27 Jan 1998 Headland 1 3 1 1 5
28 Jan 1998 Headland 2 2 3 - 5
26–28 Jan 1998 Headland 3 - 1 - 1
All sectors 5 5 1 11