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Record #192925:
Length-based assessment for mackerel icefish (Champsocephalus gunnari) at South Georgia / R.M. Hillary, and 3 others.
Title: | Length-based assessment for mackerel icefish (Champsocephalus gunnari) at South Georgia / R.M. Hillary, and 3 others. |
Author(s): | Hillary, R. M. |
Date: | 2010. |
In: | CCAMLR Science. (2010.), Vol. 17 (2010) |
Abstract: | Discusses CCAMLR mixture analysis program (CMIX) and generalised yield model (GYM) packages used by current CCAMLR assessment method, with particular reference to accurate identification of age cohorts from survey data. Describes length-based approach to cohort determination which uses bootstrap technique to estimate length distribution of population from survey data in conjunction with bootstrapped survey biomass data to yield estimate of population numbers-at-length. Comparison of this method and existing age-based CMIX/GYM methodology showed very good agreement in calculated yields for 2006, 2007 and 2009. Differences for 2008 were explained by unusual length distribution from which it was difficult to reliably estimate age composition in CMIX. Using 2009 survey data and new methodology, total allowable catch (TAC) was calculated according to CCAMLR decision rules of 1,577 and 933 tonnes for 2009-10 and 2010-11 fishing seasons respectively. Respective estimates using existing CMIX/GYM methodology were 1,590 and 968 tonnes respectively. |
Notes: | CCAMLR Science. Vol. 17 :129-137 (2010). |
Keywords: | 597 -- Fish. 597.583.15 -- Channichthyidae: Champsocephalus gunnari. 639.2 -- Fisheries. 639.227.5 -- Nototheniform fisheries. 639.2.001 -- Fisheries research. 591.134.5 -- Animals, size and body weight. 591.139 -- Animals, ageing. 59.087 -- Age determination, zoology. 574.34 -- Population dynamics. 574.36 -- Biomass and energetics of populations. 639.2.055 -- Fisheries restrictions and control. H4 -- Zoology: fish. (*7) -- Antarctic regions. (*723) -- South Georgia and Shag Rocks. (*80) -- Southern Ocean. (*82) -- South Atlantic Ocean. |
SPRI record no.: | 192925 |
LDR 02445naa#a2200000#a#4500 001 SPRI-192925 005 20240328113555.0 007 ta 008 240328s2010####xx#a##|##|###|0||#0|eng#d 035 ## ‡aSPRI-192925 040 ## ‡aUkCU-P‡beng‡eaacr 100 1# ‡aHillary, R. M. 245 10 ‡aLength-based assessment for mackerel icefish (Champsocephalus gunnari) at South Georgia /‡cR.M. Hillary, and 3 others. 260 ## ‡a[S.l.] :‡b[s.n.],‡c2010. 300 ## ‡ap. 129-137 :‡bill., diags., tables. 500 ## ‡aCCAMLR Science. Vol. 17 :129-137 (2010). 520 3# ‡aDiscusses CCAMLR mixture analysis program (CMIX) and generalised yield model (GYM) packages used by current CCAMLR assessment method, with particular reference to accurate identification of age cohorts from survey data. Describes length-based approach to cohort determination which uses bootstrap technique to estimate length distribution of population from survey data in conjunction with bootstrapped survey biomass data to yield estimate of population numbers-at-length. Comparison of this method and existing age-based CMIX/GYM methodology showed very good agreement in calculated yields for 2006, 2007 and 2009. Differences for 2008 were explained by unusual length distribution from which it was difficult to reliably estimate age composition in CMIX. Using 2009 survey data and new methodology, total allowable catch (TAC) was calculated according to CCAMLR decision rules of 1,577 and 933 tonnes for 2009-10 and 2010-11 fishing seasons respectively. Respective estimates using existing CMIX/GYM methodology were 1,590 and 968 tonnes respectively. 650 07 ‡a597 -- Fish.‡2udc 650 07 ‡a597.583.15 -- Channichthyidae: Champsocephalus gunnari.‡2udc 650 07 ‡a639.2 -- Fisheries.‡2udc 650 07 ‡a639.227.5 -- Nototheniform fisheries.‡2udc 650 07 ‡a639.2.001 -- Fisheries research.‡2udc 650 07 ‡a591.134.5 -- Animals, size and body weight.‡2udc 650 07 ‡a591.139 -- Animals, ageing.‡2udc 650 07 ‡a59.087 -- Age determination, zoology.‡2udc 650 07 ‡a574.34 -- Population dynamics.‡2udc 650 07 ‡a574.36 -- Biomass and energetics of populations.‡2udc 650 07 ‡a639.2.055 -- Fisheries restrictions and control.‡2udc 650 07 ‡aH4 -- Zoology: fish.‡2local 651 #7 ‡a(*7) -- Antarctic regions.‡2udc 651 #7 ‡a(*723) -- South Georgia and Shag Rocks.‡2udc 651 #7 ‡a(*80) -- Southern Ocean.‡2udc 651 #7 ‡a(*82) -- South Atlantic Ocean.‡2udc 773 0# ‡7nnas ‡tCCAMLR Science. ‡gVol. 17 (2010) ‡wSPRI-131147 916 ## ‡a2011/01/12 -- HS 917 ## ‡aUnenhanced record from Muscat, imported 2019 948 3# ‡a20240328 ‡bHS