What does this research mean for the field?

Over the past 30 years, structural changes in Portuguese fisheries have led to significant declines in fish landings for 26 species (55.3%). Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

This analysis assesses structural changes in Portuguese fisheries over 30 years, linked to CFP reforms.

March 8, 2026Open Access

Species-Specific Evidence of Structural Change in Portuguese Fisheries: A 30-Year Analysis of CFP Reform Influence

Key Points

This analysis assesses structural changes in Portuguese fisheries over 30 years, linked to CFP reforms.
Conducted a national quantitative assessment of fisheries data stratified by species
Analyzed landing data from 47 fish species over the years 1995 to 2024
Applied Spearman's rank correlation to identify long-term trends between year and landing volume
26 fish species (55.3%) exhibited significant negative trends in landing volumes
Detected a strong correlation (ρ up to -0.953) indicating declining fish populations

Abstract

Ova studija pruža prvu nacionalnu, po vrstama razvrstanu kvantitativnu procjenu strukturnih promjena u portugalskom morskom ribarstvu tijekom tri desetljeća (1995. – 2024.), što se podudara s velikim reformama Zajedničke ribarstvene politike (ZRP) Europske unije. Koristeći godišnje podatke o iskrcaju za 47 vrsta, primijenjena je Spearmanova korelacija rangova za otkrivanje dugoročnih monotonih trendova između godine i volumena iskrcaja. Rezultati otkrivaju sveprisutni pad: 26 vrsta (55,3%) pokazalo je značajne negativne trendove (ρ i do -0,953, p

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Pedro Valadas Monteiro

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Species-Specific Evidence of Structural Change in Portuguese Fisheries: A 30-Year Analysis of CFP Reform Influence

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Abstract

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