ICES Dt Cente DATRAS 1.1 NS-IBTS indices 2013 DATRAS Pocedue Document NS-IBTS indices clcultion pocedue Contents Genel... 2 I Rw ge dt CA -> Age-length key by RFA fo defined ge nge ALK... 4 II Rw length dt HL -> CPUE n/hou pe hul pe length clss CPUE... 4 III ALK & CPUE -> filled ALK fo ll length clsses by RFA ALKRFA... 4 IV ALKRFA & CPUE -> CPUE t ge by length clss CPUEALK... 4 V CPUEALK -> index... 5 Annex 1... 6 Annex 2... 7 Annex 3... 8 Annex 4... 9 Annex 5... 10 Vesions... 12
Genel In IBTS Noth Se the indices e clculted pe index e which e specific fo ech species. Fo most species the indices e clculted s men No/hou t ge pe sttisticl ectngle nd then s men of the sttisticl ectngles ove the index e. Fo heing spt nd sithe the indices t ge no/hou e clculted using men ove ectngles weighted fo the pecentge of e with wte depths between 10m-200m nd fo e 8 nd 9 wte depths between 10m-250m. The following ules pply: - Only vlid huls e tken into ccount - When only few ALK obsevtions e vilble dditionl dt of the ALK fom neighbouing e is used see Annex 2 - Thee is weighting fcto pplied fo ech sttisticl ectngle see Annex 1 Annex 3 - Fo heing nd spt only dy huls bsed on dynight code e tken into ccount see Annex 1 - As ge goup 2 nd olde heing in e 8 nd 9 e ssumed to be sping spwnes CPUE fo these e set to zeo - Fo heing two ext indices e clculted to eflect the Downs s heing spwning component juveniles bsed on heing up to nd including length of 12.5 cm. The fist NS He1to9 is clculted s descibed bove whees the second NS he1to7 ssumes tht the CPUE in RF8 nd 9 e zeo becuse the smll heing hee could be minly sping spwnes The following steps e pplied to the w DATRAS dt: 1. CPUE pe length l nd ge 1 cm goup nd 0.5 cm fo heing nd spt pe hul: sum by ye qute sttisticl ectngle ST nd divide by totl numbe of huls H in the sttisticl ectngle in tht ye nd qute. 2. Men CPUE by index e: sum of men CPUE pe length pe ge in ll fished ectngles in index e IA divided by numbe of fished ectngles in index e: 3. Indices by ge: sum of the CPUE by length fo specific ge within the index e:
Flow digm fom DATRAS Exchnge dt to ye clss index NS-IBTS. Age dt DATRAS: CA ecods Length dt DATRAS: HL ecods Selection of index e nd species Selection of index e nd species e.g. NS COD I Rw ge dt CA Age-length key by RFA fo defined ge nge ALK II Rw length dt HL CPUE n/hou pe hul pe length clss CPUE Selection of ye qute nd sex III ALK & CPUE filled ALK fo ll length clsses by RFA ALKRFA Weighting fcto fo spt heing sithe IV ALKRFA & CPUE CPUE t ge by length clss CPUEALK IV ALKRFA & CPUE weighted CPUE t ge by length clss CPUEALKw V CPUEALK index V CPUEALKw weighted index heing spt sithe
I Rw ge dt CA -> Age-length key by RFA fo defined ge nge ALK. Extction of w ge t length dt fom DATRAS fo species nd index e b. Clculte ge-length key by oundfish e RFA by centimete clsses nd fo heing nd spt by 0.5 cm clsses c. If thee is no ALK fo oundfish e ALK s fom neighbouing RFA s e used to fill gps see Annex 2 d. Numbes pe length clss e summed fo ge goups < plus goup. Numbes pe length clss fo ges >= plus goup e dded to the plus goup II Rw length dt HL -> CPUE n/hou pe hul pe length clss CPUE. Extction of w length dt fom DATRAS fo species nd index e: Species ecoding code is tken into ccount: Byctch species ecoding codes exist fo species then only huls with ll species epoted o the selected species ecod is seleted. NO Byctch species ecoding codes exist fo species then ll huls e selected. If thee is stndd species then tke only hul which hs dt of tht stndd species Only vlid hul dt e selected Check fo dy/night code see Annex 1; fo heing/spt only dy huls e selected fo the othe species ll huls e selected b. Clcultion of numbe of vlid huls pe sttisticl ectngle c. Addition of zeo huls i.e. dd 0 vlues fo ll omitting length clsses d. Rise dt fom sub smpling to totl numbe pe hul by multiplying the numbe t length with the sub smpling fcto e. Sum numbe t hul by length clss ove ctegoy nd sex f. If dt type is not CPUE C then NoAthul=numbe*60/HulDution g. Sum the CPUE pe hul pe length fo ech sttisticl ectngle pe oundfish e III ALK & CPUE -> filled ALK fo ll length clsses by RFA ALKRFA. If thee is no ALK fo length in the CPUE file ge infomtion is obtined s follows: 1. If length clss CPUE < minimum length clss ALK then ge=1 fo the fist qute nd ge=0 fo ll othe qutes see Annex 1 2. If minimum length clss ALK < length clss CPUE < mximum length ALK then ge is set to the neest ALK. If the ALK file contins vlues t equl distnce men is tken fom both vlues b. If length clss CPUE > mximum length ALK ge is set to the plus goup c. Mege ALK file with CPUE file by ye qute length clss see Annex 4 IV ALKRFA & CPUE -> CPUE t ge by length clss CPUEALK. Mege ALKRFA nd CPUE by ye qute RFA length clss b. Sum numbes t length pe ge pe sttisticl ectngle c. Sum numbe of huls pe sttisticl ectngle d. Clculte men CPUE t length pe ge pe by sttisticl ectngle =esultb/ecultc
IV ALKRFA & CPUE -> Weighted CPUE t ge by length clss CPUEALKw heing spt sithe Fo Noth Se IBTS heing sithe nd spt dt e weighted by depth stt in the sttisticl ectngle see Annex 1 nd Annex 3. As heing in RFA 8 nd 9 e utumn spwnes ges > 1 e set to ge=0 fo Noth Se IBTS heing in qute 1 in RFA 8 nd 9.. Mege ALKRFA nd CPUE by ye qute RFA length clss b. Sum numbes t length pe ge pe sttisticl ectngle c. Sum weights of ll vlid huls by sttisticl ectngle following Annex 3 d. Clculte weighted men CPUE =esultb/esultc V CPUEALK -> index V CPUEALKw -> indexw. Sum CPUE pe ge by indexe b. Sum numbe of fished sttisticl ectngles in indexe c. Clculte men CPUE fo the indexe =esult/esultb
Annex 1 Dy-night hul min-mx length nd ggegtion of ALK nd CPUE lookup tble fo individul index es Minimum length mm Mximum length mm Index e nd Mximum species Qute ge NS_Cod 1 6 150 900 NS_Cod 2 6 70 1100 NS_Cod 3 6 70 1100 NS_Cod 4 6 70 1100 NS_CodCt 1 6 150 900 NS_CodCt 3 6 70 1100 NS_Hddock 1 6 150 600 NS_Hddock 2 6 100 700 NS_Hddock 3 6 100 700 NS_Hddock 4 6 100 700 NS_Heing 1 5 150 320 NS_Heing 2 5 60 340 NS_Heing 3 5 60 340 NS_Heing 4 5 60 340 ALK e level RFe RFe RFe RFe NS_He1to9 1 5 60 125 RFe NS_He1to7 1 5 60 125 RFe NS_Mckeel 1 6 200 450 NS_Mckeel 2 6 50 450 NS_Mckeel 3 6 50 450 NS_Mckeel 4 6 50 450 NS_Nowy Pout 1 6 100 250 NS_Nowy Pout 2 6 50 250 NS_Nowy Pout 3 6 50 250 NS_Nowy Pout 4 6 50 250 NS_Plice III 1 10 40 600 NS_Plice III 3 10 40 600 NS_Sithe 1 6 250 900 NS_Sithe 2 6 70 1100 NS_Sithe 3 6 70 1100 NS_Sithe 4 6 70 1100 NS_Spt III 1 6 70 160 NS_Spt III 3 6 70 160 NS_Spt IV 1 6 70 160 NS_Spt IV 2 6 45 160 NS_Spt IV 3 6 45 160 NS_Spt IV 4 6 45 160 NS_Whiting 1 6 150 450 RFe RFe RFe RFe RFe RFe NS_Whiting 2 6 80 500 RFe NS_Whiting 3 6 80 500 NS_Whiting 4 6 80 500 CPUE e level Length clss ggegtion level Length Clss mm Ae weighting tken into ccount Dy/night Sttisticl ectngle 1 cm 1500 no no Sttisticl ectngle 1 cm 1500 no no Sttisticl ectngle 1 cm 800 no no 1000 Sttisticl ectngle 0.5 cm 500 yes yes Sttisticl ectngle 0.5 cm 500 1 1 Sttisticl ectngle 0.5 cm 500 1 1 Sttisticl ectngle 1 cm 600 no no Sttisticl ectngle 1 cm 500 no no Sttisticl ectngle 1 cm 800 No no Sttisticl ectngle 1 cm 1200 yes no Sttisticl ectngle 0.5 cm 300 yes yes Sttisticl ectngle 0.5 cm 300 yes yes Sttisticl ectngle 1 cm 800 650 no no no no
Annex 2 The IBTS ALK supplement pocedue The pocedue is s given below: The ALK tble by species nd Roundfishe RFA is checked fo empty cells nd fo ge clsses contining less thn 25 otoliths. If no otoliths wee collected then dt fom neighbouing RFA s e dded to the ALK. All ALKs e inspected mnully which is lso qulity contol pocedue whee peculiities e spotted. Often individul outlies o bulks of dt not consistent with the est of dt e spotted. These dt e then looked into nd send bck to the county of oigin fo checking. Mnul inspection of the ALK dt is lso used to identify omitting dt fom county discoveed when thee is no o n incomplete ALK fo RFA. The pocedue fo supplementy dt is descibed below. The ALK tble is comped with the CPUE n/h by species nd RF. Specil ttention is equied fo situtions whee the numbe of otoliths is low but the CPUE is high. If the ALK dt e not sufficient i.e. sped out ove length nd ges dditionl dt e deived fom neighbouing ALK s. If thee e only few ge goups epesented in the ALK o the length nge of the ALK is limited supplement is mde fom neighbouing RFA s. Fo some species the numbe of otoliths is too low to cete n ALK by RFA. Fo sithe nd mckeel the ge dt by qute e meged nd pplied to ll RFA s. The pocedue cn pobbly be simplified by deciding tht supplements fo given RF e deived fom ll neighbouing RFs. This will men tht: RFA1 will be supplemented by dt fom RFA2 3 RFA2 RFA1 3 4 6 7 RFA3 RFA1 2 4 RFA4 RFA2 3 5 6 RFA5 RFA4 6 RFA6 RFA2 4 5 7 RFA7 RFA2 6 RFA8 RFA7 9 RFA9 RFA8
Annex 3 Weights of the sttisticl ectngle bsed on its sufce e 10 200 mete in the Noth Se nd 10-250 mete in the Skgek nd Kttegt SttRec Weight SttRec Weight SttRec Weight SttRec Weight SttRec Weight 31F1 0.6 38F0 1 41F6 1 44F1 1 47G0 0.3 31F2 0.8 38F1 1 41F7 1 44F2 1 47G1 0.02 31F3 0.05 38F2 1 41F8 0.1 44F3 1 48E6 1 32F1 0.8 38F3 1 41G0 0.2 44F4 1 48E7 1 32F2 1 38F4 1 41G1 0.97 44F5 0.9 48E8 0.9 32F3 0.8 38F5 1 41G2 0.53 44F8 0.25 48E9 1 32F4 0.01 38F6 1 42E7 0.4 44F9 0.8 48F0 1 33F1 0.3 38F7 1 42E8 1 44G0 0.94 48F1 1 33F2 1 38F8 0.3 42E9 1 44G1 0.6 48F2 1 33F3 1 39E8 0.5 42F0 1 45E6 0.4 48F3 0.5 33F4 0.4 39E9 1 42F1 1 45E7 1 48G0 0.02 34F1 0.4 39F0 1 42F2 1 45E8 1 49E6 0.8 34F2 1 39F1 1 42F3 1 45E9 1 49E7 1 34F3 1 39F2 1 42F4 1 45F0 1 49E8 0.4 34F4 0.6 39F3 1 42F5 1 45F1 1 49E9 1 35F0 0.8 39F4 1 42F6 1 45F2 1 49F0 1 35F1 1 39F5 1 42F7 1 45F3 1 49F1 1 35F2 1 39F6 1 42F8 0.2 45F4 0.6 49F2 1 35F3 1 39F7 1 42G0 0.32 45F8 0.3 49F3 0.5 35F4 0.9 39F8 0.4 42G1 0.89 45F9 0.02 50E6 0.1 35F5 0.1 40E7 0.04 42G2 0.64 45G0 0.24 50E7 0.6 36F0 0.9 40E8 0.8 43E7 0.03 45G1 0.55 50E8 0.7 36F1 1 40E9 1 43E8 0.9 46E6 0.4 50E9 0.9 36F2 1 40F0 1 43E9 1 46E7 0.9 50F0 1 36F3 1 40F1 1 43F0 1 46E8 1 50F1 1 36F4 1 40F2 1 43F1 1 46E9 1 50F2 1 36F5 1 40F3 1 43F2 1 46F0 1 50F3 0.2 36F6 0.9 40F4 1 43F3 1 46F1 1 51E6 0 36F7 0.4 40F5 1 43F4 1 46F2 1 51E7 0 36F8 0.5 40F6 1 43F5 1 46F3 0.8 51E8 0.5 37E9 0.2 40F7 1 43F6 1 46F9 0.3 51E9 1 37F0 1 40F8 0.1 43F7 1 46G0 0.52 51F0 1 37F1 1 41E6 0.03 43F8 0.94 46G1 0.2 51F1 1 37F2 1 41E7 0.8 43F9 0.41 47E6 0.8 51F2 0.5 37F3 1 41E8 1 43G0 0.21 47E7 0.6 51F3 0 37F4 1 41E9 1 43G1 0.7 47E8 1 52E6 0 37F5 1 41F0 1 43G2 0.3 47E9 1 52E7 0 37F6 1 41F1 1 44E6 0.5 47F0 1 52E8 0 37F7 1 41F2 1 44E7 0.5 47F1 1 52E9 0.1 37F8 0.8 41F3 1 44E8 0.9 47F2 1 52F0 0.2 38E8 0.2 41F4 1 44E9 1 47F3 0.6 52F1 0.5 38E9 0.9 41F5 1 44F0 1 47F9 0.01 52F2 0.1 52F3 0
Annex 4 Filling ALK pocedue MinL 10 MxL 23 Age Age Age Age Age Age Age Age Age Age cm 1 2 3 4 5+ cm 1 2 3 4 5+ 5 0 0 0 0 5 1 0 0 0 0 6 0 0 0 0 6 1 0 0 0 0 7 0 0 0 0 7 1 0 0 0 0 8 0 0 0 0 8 1 0 0 0 0 9 0 0 0 0 9 1 0 0 0 0 10 5 2 1 0 0 10 5 2 1 0 0 11 3 7 2 0 0 11 3 7 2 0 0 12 12 2.5 7.5 1.5 0 0 13 2 8 1 0 0 13 2 8 1 0 0 14 9 2 7 1 8 14 9 2 7 1 8 15 15 9 2 7 1 8 16 16 9 2 7 1 8 17 17 9 2 7 1 8 18 18 5 2 5.5 3 5 19 19 1 2 4 5 2 20 20 1 2 4 5 2 21 21 1 2 4 5 2 22 1 2 4 5 2 22 1 2 4 5 2 23 2 4 5 6 1 23 2 4 5 6 1 24+ 0 0 0 0 1 24+ 0 0 0 0 1
Annex 5 Aggegtion of dt nd vibles Clcultions in the IBTS dtbse e only efeing to the stndd species. Vible A R I J H C Ci Cj Cij fij Oij A H C R C Ci Cj Cj Cij Significnce Index fo smpling e Index fo sttisticl ectngle Index fo length clss Index fo ge goup Numbe of vlid huls in sttisticl ectngle [] Numbe pe hou pe hul in sttisticl ectngle [] Length distibution in ectngle []: Numbe pe hou pe hul in length clss [i] nd sttisticl ectngle [] Age distibution in ectngle []: Numbe pe hou pe hul in ge goup [j] nd sttisticl ectngle [] Age/length distibution in ectngle []: Numbe pe hou pe hul in length clss [i] ge goup [j] nd sttisticl ectngle [] Age/length key fo length clss [I] in smpling e []: The popotions of fish in length clss [i] flling in ge goup [j] Numbe of otoliths smpled in smpling e [] length clss [i] nd ge goup [j] Index fo smping e Numbe of vlid huls in smpling e [] Numbe pe hou pe hul in smpling e [] totl of ll ectngles in the e Numbe of ectngles smpled in smpling e [] Men numbe pe hou pe hul in smpling e [] men of ectngles in the e Length distibution in smping e []: Numbe pe hou pe hul in length clss [i] nd smpling e [] totl of ll ectngles in the e Age distibution in smpling e []: Numbe pe hou pe hul in ge goup [j] nd smpling e [] totl of ll ectngles in the e Men distibution in smpling e []: Men numbe pe hou pe hul in ge goup [j] nd smpling e [] men of ll ectngles in the e Age/length distibution in smpling e []: Numbe pe hou pe hul in length clss [i] ge goup [j] nd smpling e [] totl of ll ectngles in the e Aggegtion by e tkes plce on two levels: Smpling e e goupings of stt. ec. into wide es. At pesent only oundfish e is llowed. The stndd e fo pticul species is selection of the sttisticl ectngle used fo computtion of bundnce index fo the species in question. It is species depended. The following fomuls descibe how to ggegte dt on smpling e level. The vibles nd eltionships fo ggegtion by stndd e e entiely pllel to ggegtion by smpling e nd will theefoe not be descibed.
Numbe of vlid huls in smpling e: H H Numbe pe hou pe hul in smpling e: C C Numbe of ectngles smpled in smpling e: R 1 Men numbe pe hou pe hul in smpling e: R C C Length distibution in smpling e: i C i C Age distibution in smpling e: j C j C Men distibution in smpling e: R j C j C Age/length distibution in smpling e: j i C j i C
Vesions Vesion Numbe Relese Dte Note 1.1 01-04-2011 Vesion elesed on IBTSWG 2011 meeting