Nutritional Composition and Derived Indices of Fish Species Sold in Portugal

This repository contains the data and analytical materials supporting the study “Nutritional Composition and Derived Indices of Fish Species Sold in Portugal.” The dataset comprises curated nutritional composition data for 40 fish species commonly available in the Portuguese market, harmonized from the Portuguese Food Composition Table (INSA, 2023) and complementary European and international sources.

The repository includes:
(i) an Excel file containing the full curated dataset with macronutrients, fatty acid classes, vitamins, minerals, and derived nutritional indices (PUFA/SFA, Na/K, Ca/P, Fe/Zn, EPA/DHA, and a modified Nutrient Rich Foods Index);
(ii) a Python analysis file used to perform all data processing, statistical analyses, and figure generation; and
(iii) two annexes in PDF format. Annex 1 provides detailed methodological descriptions and formulas for the calculation of nutritional indices and ratios, while Annex 3 documents the principal component analysis (PCA) dimensionality, nutrient loadings, and k-means clustering diagnostics. Annex 2 corresponds to the Excel dataset included in this repository.

Together, these materials enable full transparency and reproducibility of the analyses presented in the associated manuscript, including nutrient density calculations, multivariate analysis, and clustering of fish species into lean, oily, and outlier nutritional profiles.