Trawl survey of hoki and middle depth species on the Chatham Rise, January 1995 (TAN9501) / K.A. Schofield and M.E. Livingston

By: Schofield, K.A.
Contributor(s): Livingston, M.E. (NIWA. Wellington).
Material type: materialTypeLabelBookSeries: New Zealand fisheries data report: no. 59Publisher: Wellington, N.Z. : NIWA, 1995Description: 53 pages : illustrations, 30 cm.ISSN: 0113-2288.Subject(s): HOKI | TRAWLERS | CHATHAM RISE | FISHERY SURVEYS | BIOMASSOnline resources: Click here to access online
Incomplete contents:
This report summarises the results of the fourth random trawl survey in a time series providing annual relative biomass indices for hoki and other commercially important species at depths of 200-800 m on the Chatham Rise. Trawling during this voyage (TAN9501) was carried out from 4 to 27 January 1995. The major objectives of the trawl survey programme are as follows: 1. To provide a time series of comparable indices of abundance for adult hoki on the Chatham Rise. 2. To estimate future recruitment to the spawning hoki fisheries by determining the relative year class strength of juvenile hoki on the Chatham Rise. 3. To develop a time series of relative abundance for hake, ling, and other middle depth species on the Chatham Rise. 4. To collect biological data on hoki and other middle depth species for studies on growth and stock separation. 5. To define major water mass characteristics within the survey area. 6. To collect bathymetric data to refine stratum boundaries. A further objective was to carry out an exploratory survey for 4 days to investigate midwater marks using acoustic equipment and the midwater trawl net. Unfortunately, no "juvenile hoki marks" were seen, so the main objective of the trip was not fulfilled. The methods and results of the acoustic investigations are given in the voyage report for that survey. (auths.)
In: New Zealand fisheries data report In: New Zealand fisheries data report
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Item type Current location Call number Copy number Status Date due Barcode
JOURNAL JOURNAL WELLINGTON
STACK
NO. 59 1995 1 Available J010176
JOURNAL JOURNAL WELLINGTON
STACK
NO. 59 1995 2 Available J010177

18 refs; 9 tables; 8 figs; 3 appendices

This report summarises the results of the fourth random trawl survey in a time series providing annual relative biomass indices for hoki and other commercially important species at depths of 200-800 m on the Chatham Rise. Trawling during this voyage (TAN9501) was carried out from 4 to 27 January 1995. The major objectives of the trawl survey programme are as follows: 1. To provide a time series of comparable indices of abundance for adult hoki on the Chatham Rise. 2. To estimate future recruitment to the spawning hoki fisheries by determining the relative year class strength of juvenile hoki on the Chatham Rise. 3. To develop a time series of relative abundance for hake, ling, and other middle depth species on the Chatham Rise. 4. To collect biological data on hoki and other middle depth species for studies on growth and stock separation. 5. To define major water mass characteristics within the survey area. 6. To collect bathymetric data to refine stratum boundaries. A further objective was to carry out an exploratory survey for 4 days to investigate midwater marks using acoustic equipment and the midwater trawl net. Unfortunately, no "juvenile hoki marks" were seen, so the main objective of the trip was not fulfilled. The methods and results of the acoustic investigations are given in the voyage report for that survey. (auths.)

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