Catch scenarios

Basis	Total catch*	Wanted catch**	Unwanted catch**	Ftotal	Fwanted	Funwanted	SSB	% SSB change***	% Advice change^
	2020	2020	2020	2020	2020	2020	2021	2021	2021
	(t)	(t)	(t)	(ratio)	(ratio)	(ratio)	(t)	(%)	(%)
ICES Basis Advice
MSY approach: FMSY	10472	9221	1251	0.168	0.111	0.057	44936	1.18	0.03
Other scenarios
NEAFC Proposed management strategy ^^	10471	9220	1251	0.168	0.111	0.057	44936	1.18	0.0191
NEAFC Proposed management strategy ^^^	10472	9221	1251	0.168	0.111	0.057	44936	1.18	0.03
F = 0	0	0	0	0	0	0	57749	30	-100
Fpa	30092	26102	3990	0.71	0.467	0.243	20899	-53	187
Flim	36493	31422	5071	1.06	0.697	0.363	13166	-70	249
SSB2021 = Blim	46084	39013	7071	2.481	1.631	0.85	2474	-94	340
SSB2021 = Bpa= MSYBtrigger	44833	38067	6766	2.113	1.39	0.723	3712	-92	328
F = F2019	10127	8919	1208	0.162	0.106	0.056	45359	2.1	-3.3
F = MAP# FMSYlower	6854	6047	807	0.105	0.069	0.036	49368	11.2	-35
F = MAP#FMSYupper	15531	13632	1899	0.27	0.178	0.092	38734	-12.8	48

Symbol	Footnotes
#	EU multiannual plan (MAP) for the Western Waters (EU, 2019a).
*	Total catch includes EU, non EU (Russian Federation, 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 2021 relative to SSB 2020.
^	Advice value for 2020 relative to the advice value for 2019 (10 469 tonnes).
^^	TACFHCR is derived from a two-step process: FMSY = 0.168 followed by the TAC constraint (a), where the TAC2020 = TACFMSY + 0.2 × (TAC2019-TACFMSY). To calculate the catch scenario of the proposed management strategy, ICES uses the advised catches for 2019 as the TAC2019; the formula for TAC2020, therefore, corresponds to catches of 10 472 + 0.2 × (10 469–10 472) = 10 471 tonnes.
^^^	TACFHCR with TAC constraint (b) which implies no more than 20% below or 25% above of the preceding year (TACy-1).