Catch scenarios

Basis	Total catch *	Wanted catch**	Unwanted catch**	Ftotal	Fwanted	Funwanted	SSB	% SSB change ***	% Advice change ^
	2019	2019	2019	2019	2019	2019	2020	2020	2019
	(t)	(t)	(t)	(ratio)	(ratio)	(ratio)	(t)	(%)	(%)
ICES Basis Advice
MSY approach: FMSY	10469	8932	1537	0.2	0.157	0.043	42258	12.8	103
Other scenarios
Proposed management strategy^^	9408	8034	1374	0.177	0.138	0.039	43356	15.7	82
F = 0	0	0	0	0	0	0	59316	58	-100
Fpa	20446	17280	3166	0.46	0.36	0.1	31982	-14.6	296
Flim	26877	22535	4342	0.69	0.54	0.15	25431	-32	421
SSB2020 = Blim	45990	36857	9133	2.441	1.91	0.531	6800	-82	791
SSB2020 = Bpa= MSYBtrigger	42313	34361	7982	1.811	1.417	0.394	10200	-73	720
F = F2018	10230	8730	1500	0.195	0.152	0.043	42505	13.5	98
MSY Flower	7129	6099	1030	0.13	0.102	0.028	45720	22	38
MSY Fupper	10469	8932	1537	0.2	0.157	0.043	42258	12.8	103

Symbol	Footnotes
*	Total catch includes EU, non EU (Russian, Norway, etc.) “wanted catch” (landings) and discards.
**	“Wanted” and “unwanted” catch are used to describe fish that would be landed and discarded in the absence of the EU landings obligation.
***	SSB 2020 relative to SSB 2019.
^	Advice value for 2019 relative to the advice value for 2018 (5163tonnes).
^^	FHCR is derived from a two-step process: F = 0.200 followed by the TAC constraint, where the TAC2019= TACF=0.200 + 0.2 × (TAC2018-TACF=0.200). To calculate the catch option of the proposed management strategy, ICES uses the advised catches for 2018 as the TAC2018; therefore, the formula for TAC2019 corresponds to catches of 10469 + 0.2 × (5163–10469) = 9408tonnes.