A revision of the TACs and TABs output from the joint sardine and anchovy OMP is required. This is firstly to account for a change in the specification of bycatch in the landings from 2011 (de Goede 2011) and secondly to make allowance for some landings which have historically been ignored as they have not been landed under a permit. This document lists the TACs and TABs that were recommended by OMP-08 and those to be recommended by OMP-12 and makes some suggestions for how the new TAC/Bs to be recommended by OMP-12 will be calculated

De Moor, Carryn L

English

Cape Town University OpenUCT

FISHERIES/2011/SWG-PEL/77   1 A List of the TACs and TABs required as output from OMP-12  C.L. de Moor∗ Correspondence email: carryn.demoor@uct.ac.za  Introduction A revision of the TACs and TABs output from the joint sardine and anchovy OMP is required.  This is firstly to account for a change in the specification of bycatch in the landings from 2011 (de Goede 2011) and secondly to make allowance for some landings which have historically been ignored as they have not been landed under a permit.  This document lists the TACs and TABs that were recommended by OMP-08 and those to be recommended by OMP-12 and makes some suggestions for how the new TAC/Bs to be recommended by OMP-12 will be calculated.  OMP-08 The TACs and TABs recommended by OMP-08 are as follows: 1) Directed sardine TAC (Jan – Dec).  Applies to all srdine caught when sardine tonnage in the landing is >50% of landed mass.  In 2011 only sardine > 14cm have counted against this allocation. 2) Directed anchovy TAC (Jan – Aug), revised in June.  Applies to all anchovy caught except a small amount landed by sardine only RHs which is ignored. 3) Directed anchovy TAC (Sep-Dec).  Applies to all anchovy caught except a small amount landed by sardine only RHs which is ignored. 4) Sardine TAB with anchovy (Jan-Aug), revised in June, proportional to 2 above.  Calculated on the assumption that these are mostly juveniles. Should apply to all sardine landed when the anchovy mass is >50% of total landed mass.  In practice sometimes if bigger sardine from a separate trawl have been stored in a separate hold, these sardine are marked gainst the directed sardine TAC (1 above).  The expectation is that these sardine should be mostly juveniles.  In 2011 all sardine <14cm have counted against this allocation, regardless of what the dircted catch was. 5) Sardine TAB with anchovy (Sep-Dec), constant amount almost every year.  The expectation is that these sardine should be mostly juveniles.  However, larger sardine are occasionally caught and then allocated the sardine TAB with red-eye (see below). 6) Sardine TAB with redeye (Jan-Dec), constant amount almost every year.  The expectation is that these sardine should be mostly adults.  Applies to all sardine landed with redeye when redeye mass is >50% of total landed mass.                                                       ∗ MARAM (Marine Resource Assessment and Management Group), Department of Mathematics and Applied Mathematics, University of Cape Town, Rondebosch, 7701, South Africa. FISHERIES/2011/SWG-PEL/77   2OMP-12 The TACs and TABs recommended by OMP-12 are to be as follows: ANCHOVY A) Directed anchovy TAC (Jan-Aug), revised in June.  (Allocated to anchovy RHs.)  Equations for TAC will initially remain unchanged, though consideration needs to be given to min/max constraints.  If the maximum is decreased, do we still need to take into account implementation uncertainty?  See Table 1 for historic undercatch of the anchovy TAC. B) Directed anchovy TAC (Sep-Dec).  (Allocated to anchovy RHs.) Equations for TAC will initially remain unchanged, though consideration needs to be given to min/max constraints. Alternatives to A) and B) which have been requested for testing: 1) Directed anchovy TAC (Jan-Sep, Oct-Dec).   2) Directed anchovy TAC (Jan-Dec) C) Anchovy bycatch by sardine only RHs.  (Pool for sardine-only RHs.)  Primarily from bycatch with anchovy, but also from bycatch with eg redeye.  Historically this previously unaccounted for bycatch has ranged from 0t to 239t, with an average of 66t over 2001 – 2010.  We will allow an annual fixed tonnage of 250t.  An alternative of 500t is possible and will be tested if time allows BIG SARDINE (sardine >=14cm TL) D) Directed sardine TAC (Jan-Dec). (Allocated to sardine RHs.) This is where sardine > 50% of the total landed mass.  Equations used for directed sardine TAC will initially remain unchanged. Ratio of big sardine : total directed sardine landings ranges from an average of 0.96 to 1.00 over 1987-2011, and 0.94-1.00 over 2001-2010.  Thus the change to the categorization does not necessarily require an adjustment to the constraints. E) Big sardine TAB (Jan-Dec), revised mid-year.  (Pool f r all RHs.)  This is where sardine < 50% of the total landed mass.  Comprises i) sardine bycaught wit  redeye (and others) + ii) sardine bycaught with anchovy.  For i) we will initially assume a constant 7000t per year.  For ii) this will be set proporti nal to the anchovy TAC (starting with a similar style equation to that used for small sardine TAB).   SMALL SARDINE (sardine <14cm TL) F) Small sardine TAB (Jan-Dec).  (Pool for all RHs, used for all sardine bycatch from fisheries other than anchovy).  Calculated primarily to account for i) small sardine bycaught in directed sardine fishery and ii) small sardine bycaught in redeye fishery. For i), the historic ratios of small sardine bycaught in the directed sardine fishery (where sardine > 50% of landed mass) is given in Table 2.  This TAB should be a proportion of the directed sardine TAC.  Historically the proportion of small sardine in the directed sardine fishery has been ≤4% except for 1992, 1993, 1995 and 2011.  An initial suggestion wuld be to set this TAB at 7% of directed sardine TAC.  7% has only been exceeded in 1992 and 1995.  When simulation testing, the proportion of this TAB which is actually assumed to be caught will be drawn from a distribution based on the historic proportions in Table 2.  FISHERIES/2011/SWG-PEL/77   3For ii) the historic max of small sardine bycatch with redeye is 756t (in 1994) compared to a historic max of 7719t (in 1997) for big sardine bycatch with redeye.  In 2008 the landing was 0t, in 2009 it was43t, in 2010 it was 15t, and in 2011 it is currently 669t.  The proportion of sardine bycatch with redeye has been <=1% of the redeye landings, but since redeye is given a PUCL rather than a TAC, a fixed tonnage rather than a proportion of the redeye PUCL should be allocated.  Proposed 1000t.  The fixed tonnage should not be too large as to give a higher TAB than what is practically caught, because simulation testing will assume this bycatch is taken and reduce the sardine directed TAC accordingly.  However, the fixed tonnage should not be too small to result in closure of fisheries.  Proposed to be 1000t.  An alternative of 1200t will be tested if time allows. G) Small sardine TAB (Jan-Aug), revised in June.  (Allocated to all RHs).  Comprises small sardine bycaught in anchovy directed fishery.   Equations for TAB will initially remain unchanged, though I hope to modify this by including some allowance for drop-off in this allocation and not only in the simulation testing. H) Small sardine TAB (Sep-Dec).  (Allocated to all RHs).  Equations for TAB will initially remain unchanged.  Note that in the past 10 years the small ardine bycatch with anchovy during the additional season has averaged 810t, increasing beyond 2000t in 2 02 (Table 3). Alternatives to G) and H), corresponding to alternatives to A) and B) above, which have been requested for testing: 1) Small sardine TAB (Jan-Sep, Oct-Dec).  Equations f r normal season TAB will initially remain unchanged (as this will now depend on the anchovy TAC for a longer period), though as per G) I hope to modify this by including some allowance for drop- ff in this allocation and not only in the simulation testing.  See Table 3 for historic sardine bycatch during the additional season. 2) Small sardine TAB (Jan-Dec).  See Table 3 for histor c sardine bycatch with anchovy during the additional season.  Figure 1 shows the regression of the commercial sardine bycatch: anchovy ratio against that observed in the May survey.  This show a drop-off of about 50% from May to August, as assumed during previous simulations.  However, there is an increase in this ratio in October and November.  Thus an alternative method, than the framework currently used for June-August, will likely need to be developed to simulate the implementation of this TAB. References De Goede, J. 2011. Requirement for various by-catch pools and observer coverage changes as a result of new categorization of pelagic landings.  Department of Agriculture Forestry and Fisheries document FISHERIES/2011/SWG-PEL/20. 8pp. FISHERIES/2011/SWG-PEL/77   4 Table 1.  Historic total anchovy catch (in thousands of tons), and the corresponding initial normal season, AyTAC,1 , revised normal season, AyTAC,2 , and final less revised, AyAy TACTAC,2,3 − , anchovy TACs.  Although not always accurate, the diff rence between the revised and initial normal se son TAC is compared to the catch taken in July and August, as the permits have often only been available in late July.  A negative number implies the catch was more than the TAC for a particular period.  Catches TACs Difference January-June July-August September-December AyTAC,1  AyTAC,2  AyAy TACTAC,2,3 −  AyTAC,1- (Jan-Jun) AyAy TACTAC,1,2 − - (Jul-Aug) AyAy TACTAC,2,3 − - (Sep-Dec) 1987 429.506 146.517 24.357  600.000     1988 328.392 131.326 113.027  600.000     1989 280.674 13.747 0.000  300.000     1990 150.750 0.775 0.035  150.000     1991 143.813 7.197 0.034  150.000     1992 216.329 101.509 31.206  350.000     1993 115.787 78.060 42.021  360.000     1994 122.719 30.388 2.833  150.000     1995 92.777 71.767 13.886  210.000     1996 40.596 0.243 0.042  70.000     1997 2.017 31.362 27.008  60.000     1998 86.038 16.039 5.791  175.000     1999 60.282 53.592 66.018 108.000 146.000 85.000 47.718 15.592 18.982 2000 120.745 106.171 40.376 123.000 191.000 100.000 2.255 -38.171 59.624 2001 131.942 41.109 114.461 228.000 371.000 80.000 96.058 101.891 -34.461 2002 85.342 83.423 44.682 259.726 259.726 100.003 174.384 -83.423 55.318 2003 122.455 64.951 71.471 182.000 182.000 100.000 59.54 -64.951 28.529 2004 82.456 89.169 18.467 182.000 273.000 150.000 99.544 1.831 131.533 2005 158.890 69.285 54.553 215.049 215.049 81.951 56.159 -69.285 27.398 2006 52.328 56.237 25.619 212.251 212.251 150.000 159.923 -56.237 124.381 2007 109.563 72.313 71.216 186.942 386.942 150.000 77.379 127.687 78.784 2008 92.438 85.646 87.739 247.500 397.500 120.000 155.062 64.354 32.261 2009 63.707 74.090 36.668 299.437 449.437 120.000 235.73 75.91 83.332 2010 106.008 105.906 5.151 303.183 453.183 120.000 197.175 44.094 114.849 2011 64.218 55.259  247.500 270.291  183.282 -32.468    FISHERIES/2011/SWG-PEL/77   5Table 2. Ratio of small (<14cm) : big (≥14cm) sardine in the directed sardine fishery.  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec annual small sardine in tons annual big sardine in tons annual small sardine in tons : big sardine in tons annual small sardine : total directed sardine 1987 0.00 0.00 0.03 0.01 0.00 0.00 0.00 0.00 0.00 211 24620 0.01 0.01 1988 0.00 0.00 0.00 0.00 0.00 0.00 0.08 0.02 0.00 0.00 0.29 0.05 456 27725 0.02 0.02 1989 0.00 0.00 0.01 0.04 0.06 0.01 0.00 0.00 0.00 0.01 0.01 0.01 365 22265 0.02 0.02 1990 0.04 0.01 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.02 0.00 219 48609 0.00 0.00 1991 0.02 0.00 0.00 0.00 0.00 0.07 0.00 0.00 0.00 0.00 0.00 0.00 415 43170 0.01 0.01 1992 0.00 0.00 0.00 0.00 0.00 0.40 0.10 0.33 0.01 0.00 0.00 0.00 3755 36711 0.10 0.09 1993 0.00 0.00 0.00 0.07 0.24 0.19 0.23 0.01 0.00 0.00 0.00 0.00 2568 38881 0.07 0.06 1994 0.06 0.07 0.01 0.01 0.12 0.05 0.00 0.02 0.00 0.00 0.00 0.00 2701 72765 0.04 0.04 1995 0.00 0.00 0.01 0.00 0.08 0.17 0.36 0.52 0.09 0.00 0.18 0.00 10302 82880 0.12 0.11 1996 0.08 0.03 0.00 0.11 0.04 0.01 0.00 0.00 0.00 0.00 0.00 0.00 1572 93325 0.02 0.02 1997 0.06 0.00 0.00 0.00 0.00 0.00 0.02 0.01 0.08 0.01 0.00 0.00 1859 102261 0.02 0.02 1998 0.00 0.00 0.00 0.00 0.01 0.06 0.00 0.01 0.00 0.00 0.00 0.00 1274 113601 0.01 0.01 1999 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 108 119276 0.00 0.00 2000 0.00 0.00 0.00 0.02 0.02 0.00 0.00 0.00 0.00 0.00 0.00 620 124505 0.00 0.00 2001 0.00 0.00 0.00 0.00 0.01 0.00 0.03 0.05 0.01 0.01 0.00 0.00 1288 173874 0.01 0.01 2002 0.00 0.01 0.01 0.02 0.02 0.01 0.04 0.13 0.00 0.00 0.00 0.00 3870 242523 0.02 0.02 2003 0.00 0.00 0.03 0.01 0.02 0.00 0.00 0.01 0.01 0.01 0.00 0.00 2131 273182 0.01 0.01 2004 0.00 0.00 0.00 0.00 0.01 0.00 0.01 0.00 0.00 0.00 0.00 0.00 740 364131 0.00 0.00 2005 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 96 239060 0.00 0.00 2006 0.00 0.00 0.01 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 621 205848 0.00 0.00 2007 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 12 133860 0.00 0.00 2008 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 25 84140 0.00 0.00 2009 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 107 88928 0.00 0.00 2010 1.36 0.01 0.02 0.00 0.02 0.01 0.00 0.17 0.03 0.01 0.00 0.00 2717 85293 0.03 0.03 2011 0.00 0.00 0.01 0.04 0.07 0.03 0.35 0.00 0.00 5329 80881 0.07 0.06 average all years 0.07 0.01 0.01 0.01 0.03 0.04 0.05 0.05 0.01 0.00 0.02 0.00 1734.46 0.02 0.02 average 87-96 0.02 0.01 0.01 0.02 0.06 0.09 0.08 0.09 0.01 0.00 0.06 0.01 2256.46 0.04 0.04 average 2001-10 0.14 0.00 0.01 0.00 0.01 0.00 0.01 0.04 0.01 0.00 0.00 0.00 1160.69 0.01 0.01 FISHERIES/2011/SWG-PEL/77   6Table 3. The sardine bycatch with anchovy (where anchovy is the largest species by mass in the landing) during the last four months of the year which has over the past decade been the “additional season”.  Empty cells are those for which no anchovy catch occurred.    Small sardine bycatch with anchovy Big sardine bycatch with anchovy All Bycatch Sep Oct Nov Dec Total Additional Season Sep Oct Nov Dec Total Additional Season 1987 198.6    198.6 7.5    7.5 206.1 1988 125.7 288.0 36.5  450.1 28.8 411.1 198.2  638.1 1088.2 1989     0.0     0.0 0.0 1990 0.0    0.0 0.0    0.0 0.0 1991 0.0    0.0 0.0    0.0 0.0 1992 255.9 6.7 0.0  262.6 21.0 1.5 0.0  22.5 285.1 1993 554.7 146.5 0.0 0.2 701.4 3.6 16.6 0.0 0.1 20.3 721.7 1994 31.8    31.8 0.0    0.0 31.9 1995 130.7 1483.5 220.2  1834.3 362.2 486.8 314.7  1163.7 2998.1 1996  1.9 0.0  1.9  1.9 0.0  1.9 3.8 1997 2934.6 759.3   3693.9 291.5 159.1   450.6 4144.5 1998 544.3 55.2   599.6 133.6 195.9   329.5 929.1 1999 734.7 98.5 54.2  887.4 831.1 503.6 34.9  1369.5 2257.0 2000 29.0 17.7 0.0  46.7 113.9 3.0 0.0  116.9 163.6 2001 1020.1 771.3 0.1 0.0 1791.5 358.4 1071.5 100.6 27.7 1558.2 3349.7 2002 2337.9  0.0 9.4 2347.2 371.0  64.2 54.6 489.8 2837.0 2003 204.9 412.3 129.1 0.0 746.3 200.4 450.5 0.8 0.0 651.8 1398.1 2004 150.3 0.0 2.4  152.7 148.6 0.0 169.3  317.9 470.6 2005 457.1 175.3 12.6 0.0 645.1 62.5 158.8 362.8 0.0 584.1 1229.2 2006 1609.3 65.2 5.9  1680.5 452.8 47.4 0.0  500.2 2180.7 2007 94.8 189.1 0.0 4.5 288.3 62.6 31.8 0.0 23.1 117.6 405.9 2008 136.6 85.8 0.2 0.1 222.7 0.0 59.6 290.2 50.7 400.5 623.2 2009 59.1 61.2 8.7  129.1 3.6 36.0 1.1  40.7 169.8 2010 34.9 46.5 15.1  96.5 0.7 0.0 0.0  0.7 97.2 Average 1987-2010 700.3 Average 1987-2010 365.9 1066.3 Average 2001-2010 810.0 Average 2001-2010 466.1 1276.1    FISHERIES/2011/SWG-PEL/77   7 Figure 1. The regressions of the ratio of small sardine bycatch : anchovy1 in the monthly commercial catch against that observed in the recruit survey, i.e. minimising ( ) ( )[ ]∑=−201019872,,,,,,, //yobsAryobsSrymAmybycSmy NNkCC  w.r.t. mk .  The outliers of commercial ratios of 0.69 and 0.68 in October and November 2010 are removed, as these could be  biased by the mid-water trawl experiments which occurred at this time.  The regressions excluding these outliers are given by the dotted lines.                                                      1 For cases where anchovy is the maximum species by mass in the landing 0.00.10.10.20.20.30.30 0.1 0.2 0.3 0.4 0.5Commercial catch ratioRecruit survey ratioksur=0.680.00.10.20.30.40.50 0.1 0.2 0.3 0.4 0.5Commercial catch ratioRecruit survey ratioJunekjun=0.900.000.050.100.150.200 0.1 0.2 0.3 0.4 0.5Commercial catch ratioRecruit survey ratioJulykjul=0.390.000.050.100.150.200 0.1 0.2 0.3 0.4 0.5Commercial catch ratioRecruit survey ratioAugkaug=0.380.000.050.100.150 0.1 0.2 0.3 0.4 0.5Commercial catch ratioRecruit survey ratioSepksep=0.340.00.20.40.60.80 0.1 0.2 0.3 0.4 0.5Commercial catch ratioRecruit survey ratioOctkoct=0.78koct=0.580.00.20.40.60.80 0.1 0.2 0.3 0.4 0.5Commercial catch ratioRecruit survey ratioNovknov=0.89knov=0.460.000.020.040.060.080.100 0.1 0.2 0.3 0.4 0.5Commercial catch ratioRecruit survey ratioDeckdec=0.17

A list of the TACs and TABs required as output from OMP-12

https://open.uct.ac.za/bitstream/11427/19047/1/de_Moor_A_list_TACsTABs_2011.pdf

A list of the TACs and TABs required as output from OMP-12

Abstract

Similar works

Full text

Available Versions

Cape Town University OpenUCT