77_GUR_09

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77_GUR_09.pdf

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77_GUR_09.pdf (290.0 kb)

Abstract
Estimates of current and reference absolute biomass are not available for any gurnard stock. Estimates of current and reference biomass were available for GUR 1W and GUR 1E after the 1997–98 stock assessment, but can no longer be considered current and in 2008 the Northern Inshore Finfish Working Group (NINSWG) recommended that this assessment be revisited.

Red gurnard is a major bycatch species subject to wide variations in recorded catch. This is partly due to changes in target fisheries and stocks, and to natural variations in the red gurnard stocks. The MCY estimates derived from catch statistics are subject to a great deal of uncertainty and are probablyconservative.

The current TACCs were based on a period of highest ever catches, and these levels have not been reached in recent years. In GUR 1, current catch levels are probably constrained by changes in the target fisheries.

GUR 1W
Standardised CPUE indices of abundance suggest that stock size has fluctuated around the long-term average since 1989-90.

GUR 1E Recent CPUE analyses for East Northland (up to 2004–05) indicate that abundance declined from 1991-92 to 1995-96 and then increased back to the former high by 2004-05.The CPUE analysis for the Bay of Plenty show a declining trend from 1991-92 to 1994-95 and has remained constant sincethat time.

Stable or increasing CPUE trends in conjunction with a 20 year period of reasonably constant annual landings suggest that recent catches in GUR 1 are sustainable. As annual landings have remained at or a little over half the 2287t TACC it is not known whether the TACC issustainable.

GUR 2
A stock assessment of GUR2 was attempted in 1997–98, but rejected by the Inshore Working Group. CPUE analyses suggest that GUR2 abundance remained fairly stable between 1989/90 and 2004/05. Reported landings were also reasonably stable during this period, fluctuating between 450t and 708t. These results suggest that catches in this time period and the TACC are probably sustainable, at least in the short-term.

GUR 3
Stock Structure Assumptions
No information is available on the stock separation of red gurnard. The Fishstock GUR 3 is treated in this summary as a unit stock.

Document date
Sunday, 31 May 2009

Document type
V 1.3

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Adobe PDF

File size
290.0 kb

Reference number
2009

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M:\SCIPOL\Working Groups 2009\Plenary 2009\FINAL\MFish 2009 May Plenary\May 2009 - PDF\77_GUR_09.pdf

Uploaded date
Thursday, 11 June 2009

Search tags

Species: GUR;
Stock: GUR1; GUR10; GUR2; GUR3; GUR7; GUR8;

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