### New Zealand fur seal pup production and measurement data

Since 1991, the Department of Conservation has monitored NZ fur seal pup production at three breeding colonies on the West Coast – Wekakura Point, Cape Foulwind and Taumaka (Open Bay Islands). Pup production estimates are derived using both direct counts of dead pups and a mark-recapture methodology. The mark-recapture exercises take place in the last week of January each year.

At Taumaka Island, the largest of the Open Bay Islands and the furthest south of the three colonies being monitored, approximately 800 pups are marked each year with the first 100 pups of each sex weighed and measured.

At Cape Foulwind, Westport, approximately 200 pups are marked each year, with the first 50 of each sex weighed and measured.

At Wekakura Point, the furthest north of the monitored colonies, approximately 500 pups a year are marked, with the first 75 of each sex weighed and measured.

### Data provenance

The original data were recorded in two spreadsheets per year: one containing marking and measurement data, and another with mark-recapture counts and pup production estimates. Data from the annual spreadsheets were combined and transferred into three spreadsheets (one each for tagging, mark-recapture, and dead counts) at the Department of Conservation, and then groomed further by Dragonfly Science to complete missing data and correct inconsistencies. A record was kept of all changes to the data. These changes are visible from individual tagging events, by following the details link. A record of all updates is available as a CSV file.

### Data licence

Data are made available for reuse by the Department of Conservation, under a creative commons attribution licence, following the recommendations of NZGOAL. This licence allows the data to be used for any other purpose and republished, provided only that attribution is given to the source. At the bottom of each page, a citation is given with a preferred format for referencing the data.

### Acknowledgement

This database was developed by Finlay Thompson and Richard Mansfield of Dragonfly Science. We are grateful to all the scientists who have collected these data, most recently Hugh Best, who coordinates the population monitoring programme. We also gratefully acknowledge the ongoing support for the West Coast fur seal pup counts provided by DOC Regional and District staff, Tai Poutini Papatipu Runanga and the trustee owners of Taumaka me Popotai. The development of this database was funded by the Department of Conservation's Marine Species and Threats team project focusing on improving accessibility to data.

### Contact

For information about the New Zealand fur seal monitoring programme please contact the Marine Species and Threats Team (marine@doc.govt.nz). To report problems with the website, or for queries about the data grooming and preparation, please contact Finlay Thompson (finlay@dragonfly.co.nz).

### Searching the tag data

Filters are typed into the search box as a key, followed by a colon, followed by a value. For example `year:2002` restricts the data to pups that were tagged during 2002. Filters that are applied will appear above the search box, and may be removed by clicking on the cross beside them. Recognised filter keys are listed below:

from: Finds pups tagged on or after a date given in YYYY-MM-DD format. For example: `from:2002-02-02`

to: Finds pups tagged on or before a date given in YYYY-MM-DD format. For example: `to:2003-03-03`

year: Finds pups tagged in a calendar year. For example, entering `year:2003` will set the from date to 2003-01-01 and the to date to 2003-12-31.

month: Finds pups tagged in a calendar month. For example, entering `month:2003-04` will set the from date to 2003-04-01 and the to date to 2003-04-30.

day: Finds pups tagged on the given day. For example, entering `day:2003-04-05` will set both the from and to dates to 2003-04-05.

tag: Finds pups associated with the given tag. This filter expects a colour, shape, and tag number, in that order, separated by colons. For example, `tag:orange:button:1234` specifies the tag with the colour blue, the button shape, and number 1234.

Components of the tag search can be left out and replaced by a question mark. For example, to search for all tags with the number 4321, enter `tag:?:?:4321`.

Unknown digits in the tag number can also be given as a question mark, for example, `tag:orange:button:123?` finds all orange button tags with numbers starting "123"; `tag:white:?:2?7?` finds white tags whose numbers start with 2 and have a 7 in the third position.

colour: Finds tags with the given colour. This filter has the same effect as the first element of the `tag` filter.

shape: Finds tags with the given shape. This filter has the same effect as the second element of the `tag` filter.

number: Finds tags matching the given number or partial number. This filter has the same effect as the third element of the `tag` filter.

notches: Finds tags exactly matching a given set of edge-notch positions. For example, `notches:2,3` finds tags with edge notches in both the 2 o'clock and 3 o'clock positions; `notches:6` finds tags with an edge notch in the 6 o'clock position only, but it will not find tags notched at both 6 and 7 o'clock) (see below);

notch: Finds all tags with an edge-notch in the given position. For example, `notch:2` finds all tags that have an edge-notch in the 2 o'clock position, including tags with additional notches in other positions.

location: Restricts the search to sightings at the given location, for example: `location:sector-4`.

colony: Restricts the search to sightings at the given colony. Recognised values are wekakura-point, cape-foulwind and open-bay-islands.

sex: Finds pups of the given sex. The value must be one of M, F, or U (unknown).

### Description of fields

### Tag data

Tags: Tags are identified by colour and shape, followed by a number.

At each of the three colonies, different coloured tags are given to male and female pups. Valid tag shapes are 'disc' and 'button'. The following tag types appear in the database:

- Green disc (Wekakura Point, males)
- Lilac disc (Wekakura Point, females)
- Blue button (Cape Foulwind, males)
- Orange button (Cape Foulwind, females)
- White button (Open Bay Islands, males)
- Yellow button (Open Bay Islands, females)

Tag numbers are either a four-digit number, or an 'A' followed by a three-digit number.

### Edge notches

Tag notches: Since 1993, the tags have been clipped across the top and then edge notched to signify the year of tagging, in case the pigment or the identity numbers becomes indecipherable with time.

Numbers listed under the Notches column refer to the clock positions of any notches with respect to the writing on the face of the tag. In most cases, notched tags also have a straight piece cut off the top of the tag to indicate the 12 o'clock position.

### Mark-recapture estimation

Mark-recapture experiments are a way of estimating the pup population at a breeding site when the size of the colony precludes direct counts of the pups.

A fixed number of pups are marked with flipper tags, or by clipping fur on the pup's forehead. On subsequent days a series of recapture counts of both marked and unmarked pups is performed. The ratio of marked to unmarked pups is used as the basis for estimating the entire pup population.

### Dead counts

At each of the three colonies dead pups are recorded as they are found during the tagging or marking exercise. These do not represent all of the pup mortality that may have occurred prior to the mark-recapture experiment, because these colonies are infrequently visited. On the day of conducting recounts, any freshly dead marked or unmarked pups are recorded and these freshly dead pups are added to the mark-recapture tally.