Catch scenarios

Basis	Total catch *	Wanted catch**	Unwanted catch**	Fwanted	SSB	% SSB change ***	% TAC change^	% Advice change ^^
	2019	2019	2019	2019	2020	2020	2020	2020
	(t)	(t)	(t)	(ratio)	(t)	(%)	(%)	(%)
ICES Basis Advice
MSY approach: FMSY × SSB (2019)/MSY Btrigger	414	395	19	0.154	2636	-2	936
Other scenarios
F = FMSYlower× SSB(2019)/MSYBtrigger	336	320	16	0.123	2707	0.59	739
F = FMSYupper ×SSB(2019)/MSYBtrigger	490	467	23	0.185	2567	-4.6	1125
F= FMSY	527	502	25	0.2	2533	-5.9	1217
F = FMSYupper	621	592	29	0.24	2447	-9.1	1453
F = FMSYlower	429	409	20	0.16	2622	-2.6	973
F = 0	0	0	0	0	3014	12	-100
Fpa	551	525	26	0.21	2511	-6.7	1277
Flim	733	699	34	0.29	2345	-12.9	1734
SSB (2020) = Blim	563	537	26	0.22	2500	-7.1	1309
SSB (2020)=Bpa =MSYBtrigger^^^
F = F2018	47	45	2	0.0165	2971	10.4	18

Symbol	Footnotes
*	Total catches are calculated from wanted catch (fish that would be landed in the absence of the EU landing obligation), based on the average discard rate in 2015–2017 (4.7% in weight).
**	The “wanted” and “unwanted catch” are used to describe fish that would be landed and discarded, respectively, in the absence of the EU landing obligation.
***	SSB 2020 relative to SSB 2019.
^	Total catch in 2019 relative to TAC 2018 (40 tonnes).
^^	Advice value 2019 relative to advice value 2018. This is not provided because catch advice in 2017 was zero.
^^^	The MSY Btrigger option was left blank because MSY Btrigger cannot be achieved in 2020, even with catch advice that is zero.