A standardised bottom longline catch-per-unit-effort series showed a strong decline between 1990 and 1997, followed by a long flat period and a decline to 2024 which was not consistent with the research trawl survey data. A standardised index of ling taken as bycatch in the scampi trawl fishery was only considered plausible for years before the scampi fishery introduced gear modifications to reduce bycatch (1992 to 2003). Neither of the indices was used in the 2025 stock assessment for LIN 3&4.
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