Trawl survey of middle depth species in the Southland and Sub-Antarctic areas, November-December 2008 (TAN0813)

By: O'Driscoll, R.L.
Contributor(s): Bagley, N.W. (NIWA. Wellington).
Material type: materialTypeLabelBookSeries: New Zealand fisheries assessment report ; 2009/56.Publisher: Wellington : Ministry of Fisheries, 2009Description: 67 p. : figs. ; 30 cm.ISSN: 1175-1584.Report number: CCMAU4 0911Subject(s): TRAWLING | FISHERY MANAGEMENT | STOCK ASSESSMENT | SOUTHLAND | SUBANTARCTIC REGIONSOnline resources: Click here to access online In: New Zealand fisheries assessment reportSummary: The twelfth Tangaroa summer trawl survey of the Southland and Sub-Antarctic areas was carried out from 24 November to 23 December 2008. Ninety-five trawls were successfully completed in 21 strata. Biomass estimates (and c.v.s) for all strata were 48 341 t (14%) for hoki, 22 880 t (10%) for ling, and 2354 t (16%) for hake. The hoki biomass was similar to the 2007 estimate of 46 003 t, confirming the large increase from 2006 (14 747 t). The hake estimate from all strata was also similar to that from 2007 (2622 t), although the estimate from core 300-800 m strata was lower because almost half of the hake biomass in 2008 was in stratum 25 (800-1000 m) at Puysegur. Ling were down slightly (by 14%) from 2007 (26 494 t). The biomass of javelinfish was the highest in the Sub-Antarctic trawl time series and four times higher than in 2007. Southern blue whiting and white warehou were also up from 2007, while estimates for some other species like ribaldo and pale ghost shark were down.
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Item type Current location Call number Copy number Status Date due Barcode
JOURNAL JOURNAL WELLINGTON
JOURNALS
NO. 2009/56 1 Available J09654

Bibliographic references (p. 15-16)

The twelfth Tangaroa summer trawl survey of the Southland and Sub-Antarctic areas was carried out from 24 November to 23 December 2008. Ninety-five trawls were successfully completed in 21 strata. Biomass estimates (and c.v.s) for all strata were 48 341 t (14%) for hoki, 22 880 t (10%) for ling, and 2354 t (16%) for hake. The hoki biomass was similar to the 2007 estimate of 46 003 t, confirming the large increase from 2006 (14 747 t). The hake estimate from all strata was also similar to that from 2007 (2622 t), although the estimate from core 300-800 m strata was lower because almost half of the hake biomass in 2008 was in stratum 25 (800-1000 m) at Puysegur. Ling were down slightly (by 14%) from 2007 (26 494 t). The biomass of javelinfish was the highest in the Sub-Antarctic trawl time series and four times higher than in 2007. Southern blue whiting and white warehou were also up from 2007, while estimates for some other species like ribaldo and pale ghost shark were down.

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