Internal Corporate Social Responsibility and Multilevel Labour Management in Fishing Organisations: A PLS-SEM Sequential Mediation Model for Sustainable Decent Work

The fishing processing industry in Chimbote, Peru, reflects structural vulnerabilities common in extractive sectors of the Global South, including labour informality, weak occupational safety, and limited Internal Corporate Social Responsibility (ICSR). These conditions hinder progress toward Sustainable Development Goal 8 (SDG 8). While prior studies link ICSR to positive employee outcomes, the mechanisms through which its effects translate across organisational levels remain theoretically underdeveloped, par-ticularly in high-informality contexts. A quantitative, explanatory, cross-sectional design was employed using data from 384 workers in fishing processing firms. Data were col-lected through a 26-item Likert-scale instrument. Partial Least Squares Structural Equation Modelling (PLS-SEM) was applied to test a sequential mediation model, where ICSR in-fluences organisational-level labour management through individual and group-level processes. Reliability and validity were confirmed using Cronbach’s alpha, Composite Reliability, AVE, Fornell–Larcker, and HTMT. Structural relationships were assessed via bootstrapping (5,000 subsamples), and predictive relevance was evaluated using Q² and PLS Predict. The measurement model showed adequate reliability and validity. The direct effect of ICSR on organisational-level labour management was non-significant (β = 0.029, p = 0.567). However, all mediated paths were significant: ICSR → Individual (β = 0.608), Individual → Group (β = 0.526), and Group → Organisational (β = 0.396), all p < 0.001. Sequential mediation was confirmed (β_indirect = 0.127; 95% CI [0.090, 0.164]). Model fit (SRMR = 0.045) and predictive relevance (Q² = 0.150–0.361) were satisfactory. ICSR does not directly influence organisational outcomes; instead, its impact operates through a bottom-up multilevel mechanism, reinforcing individual, group, and organ-isational dynamics. These findings contribute to sustainable labour governance and multilevel organisational theory.