department of primary industry, fisheries and mines acoustic tagging

DEPARTMENT OFPRIMARY INDUSTRY, FISHERIES AND MINES

Acoustic Tagging

Jewfish Jewfish Workshop Workshop

20062006


To examine the movement patterns of aggregating black jewfish

Aim

TASMANIAN AQUACULTURE & FISHERIES INSTITUTE


VR2 Acoustic ‘listening stations’


Acoustic Arrays



Arrays established at 2 large aggregation sites: Channel Point and Chambers Bay

Acoustic Arrays




Arrays established at 2 large aggregation sites: Channel Point and Chambers Bay

Arrays also established between Channel Point and Chambers Bay

Acoustic Arrays



Channel Point

Chambers BayDarwin


Fish surgically implanted with acoustic tags

Acoustic Tagging




40 fish tagged at Channel Point between Dec 04 and Oct 2005

Size range 940-1220 mm TL

Acoustic Tagging






44 fish tagged at Chambers Bay between Sept and Nov 2005


Acoustic Tagging






44 fish tagged at Chambers Bay between Sept and Nov 2005


All fish monitored until May 2006

Acoustic Tagging



Results


33/40 Fish detected at Channel Point


Results



22/44 Fish detected at Chambers Bay


Results




No fish detected at both aggregations


Results




No fish detected at both aggregations

No fish detected at sites between aggregations


Channel Point Aggregation


Channel PointStations along 20 m depth contour


Presence of Tagged Fish At Cape Peron

Nov-04 Dec-04 Jan-05 Feb-05 Mar-05 Apr-05 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05 Nov-05 Dec-05 Jan-06 Feb-06 Mar-06 Apr-06 May-06

Time (Days)

Presence of 1st set of fish tagged at Channel Point

Fish Residency


Nov 04 Mar 05 Aug 05 Dec 05 May 06




Time (Days)

Fish Residency







Time (Days)

Fish Residency




Fish absent for seven months




Time (Days)

Fish Residency







Time (Days)

Fish Residency




Fish absent for nine months




Time (Days)



Fish ResidencyPresence of 2nd set of fish tagged at Channel Point




Time (Days)



Fish ResidencyPresence of 2nd set of fish tagged at Channel Point

Fish absent for most part of 8 months

(May to Dec)




Time (Days)


Fish Residency


Presence of 3rd set of fish tagged at Channel Point




Time (Days)


Fish Residency


Presence of all fish tagged at Channel Point




Time (Days)


Fish Residency


Presence of all fish tagged at Channel Point

Spawning season


Diurnal Cycle

0

500

1000

1500

2000

2500

3000

3500

4000

0:00 6:00 12:00 18:00 0:00

Time of Day

Nu

mb

er o

f D

etec

tio

ns


Diurnal PatternsDiurnal cycle


Tide Phase All Sites - January

0

500

1000

1500

2000

2500

Tide Phase

Nu

mb

er o

f D

etec

tion

s

High HighLow

Tide phase - All sites - January

Tidal Patterns



January Tag Detections

0

1

2

3

4

5

6

7

1/1/06 2/1/06 3/1/06 4/1/06 5/1/06 6/1/06 7/1/06 8/1/06 9/1/06 10/1/06 11/1/06 12/1/06 13/1/06 14/1/06 15/1/06

Time (Days)

Tid

e H

ight

(m)

0

100

200

300

400

500

600

700

Site 3

Site 4

Site 5

Tidal Movement


Early January tag detections


Channel Point Aggregation


Channel PointStations along 20 m depth contour



0

1

2

3

4

5

6

7

1/1/06 2/1/06 3/1/06 4/1/06 5/1/06 6/1/06 7/1/06 8/1/06 9/1/06 10/1/06 11/1/06 12/1/06 13/1/06 14/1/06 15/1/06

Time (Days)

Tide

Hig

ht (m

)

0

100

200

300

400

500

600

700

Site 3

Site 4

Site 5

Tidal Movement


Early January tag detections



0

1

2

3

4

5

6

7

1/1/06 2/1/06 3/1/06 4/1/06 5/1/06 6/1/06 7/1/06 8/1/06 9/1/06 10/1/06 11/1/06 12/1/06 13/1/06 14/1/06 15/1/06

Time (Days)

Tide

Hig

ht (m

)

0

100

200

300

400

500

600

700

Site 3

Site 4

Site 5

Tidal Movement


Site 5: Residence related to low tide



0

1

2

3

4

5

6

7

15/1/06 16/1/06 17/1/06 18/1/06 19/1/06 20/1/06 21/1/06 22/1/06 23/1/06 24/1/06 25/1/06 26/1/06 27/1/06 28/1/06 29/1/06 30/1/06 31/1/06Time (Days)

Tid

e H

ight

(m)

0

100

200

300

400

500

600

700

Site 3

Site 4

Site 5

Tidal Movement


Increase in residence time as tides go neap



0

1

2

3

4

5

6

7

1/1/06 2/1/06 3/1/06 4/1/06 5/1/06 6/1/06 7/1/06 8/1/06 9/1/06 10/1/06 11/1/06 12/1/06 13/1/06 14/1/06 15/1/06

Time (Days)

Tide

Hig

ht (m

)

0

100

200

300

400

500

600

700

Site 3

Site 4

Site 5

Tidal Movement


Site 4: Residence related to high tide


• Black Jewfish may not mix between aggregations

Conclusions




• Fish absence at Channel Point may be linked to spawning

Conclusions





• Movement within Channel Point aggregation is linked to time of day and tidal cycle

Conclusions





• Movement within Channel Point aggregation is linked to time of day and tidal cycle

• Modelling stills needs to occur to decipher information

Conclusions


department of primary industry, fisheries and mines acoustic tagging

Documents