Fisheries Infosite

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The Plenary Report summarises biological, fishery, stock assessment and stock status information for 80 species or species groups, each of which is split into 1-10 stocks. The Plenary takes into account the most recent data and analyses available to Fisheries Assessment Working Groups (FAWGs) and the Fisheries Assessment Plenary and also incorporates relevant analyses undertaken in previous years.

This page enables you to search through all plenary reports since 2006.

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Title: Plenary (EEL_FINAL 08)
EEL_FINAL 08.pdf (304.0 kb)

Estimates of current and reference biomass are not available. The Working Group recognises that
there are no stock assessments, or reliable data or time series on which to base specific
recommendations on catch levels. Given the biology of eels, there is a risk that the current
exploitation levels for longfin eels in particular, coupled with past and present anthropogenic
impacts, are not sustainable. Recent reductions in catch levels for longfin eels in the North Island, the
introduction of an upper size limit in the North Island, and additional areas closed to fishing, may
have reduced the risk level. Based on available information, the Working Group does not consider
that the same risk applies to shortfin eels, although caution is required given the nature of eel biology
and exploitation before spawning escapement.
The Working Group considers that further management action is required to improve the spawner
escapement of longfin eels. It is not possible to recommend specific TACs but measures are required
to increase the spawner escapement of longfin eels to improve recruitment. Measures could include
reductions in catch levels, changes to size limits and area closures.

Title: Plenary (EEL_07)
EEL_07.pdf (203.7 kb)
Plenary (EEL_07)
Title: Plenary (EEL_06)
EEL_06.pdf (92.6 kb)
Plenary (EEL_06)
Title: 25_EEL_09
25_EEL_09.pdf (498.7 kb)
Longfin eel
The Working Group recognises that there are no stock assessments on which to base specific recommendations on longfin catch levels. Nevertheless, recruitment data, CPUE indices, and information on spawner escapement allow for a cautioned assessment to be made of longfin and shortfin stock status.

From the age composition of juvenile eels there is evidence that glass eel recruitment has declined in two North Island and three South Island waters, and there is anecdotal evidence that glass eel runs are now substantially smaller in the Waikato River that in the 1970’s.

Nevertheless, results from 2007–08 show that, with the exception of 1997-98, the number of longfin elvers at two of the main monitoring stations (Karapiro and Matahina dams) was the highest that has been recorded in the past 16 years.

The only reliable estimates of relative abundance are based on CPUE data. For the North Island, the ESAs with the largest longfin commercial catches (ESAs AA, AD, and AH) all showed declines of 25-75% in CPUE indices from 1990-91 to 2003-04, with the largest reduction occurring in Rangitikei-Wanganui (ESA AH). By contrast, although the main commercial longfin fisheries in the South Island (ESAs AX, AV, and AW) had either relatively stable or decreasing CPUE indices from 1990-91 to 2000-01 (the year eels were introduced into the QMS on the South Island), these generally increased from 2
Title: Freshwater eels, shortfin and longfin
25_EEL_2010.pdf (438.8 kb)
This document summarises the most recent New Zealand fishery, biological, stock assessment and stock status information about freshwater eels.