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This paper addresses a systemic approach for the study of fishers' ecological knowledge in order to describe fishers' ways of knowing and dealing with complexity in ecosystems, and discusses how knowledge is generated through, e.g. apprenticeship, experiential knowledge, and testing of hypotheses. The description and analysis of fishers' ecological knowledge has been done using the Structure-Dynamics-Functions conceptual framework. Fishers identify 5-50 feeding interactions (Structure), recognize populations' dynamics over time, and, the impact of external factors (climate change, water quality and overfishing) (Dynamics) and finally, acknowledge different values or services (Functions) of the ecosystem (drinking water and fishing). Knowing about these three main aspects seems to be core knowledge embedded in fishers' ecological knowledge, which comprises systems thinking. Systems thinking is arguably part of fishers' professional skills and significant for sustainable natural resource management yet understanding ecosystem complexity is also a cognitive challenge.

Education sciences research has showed that learning is a complex interaction between individuals and their surrounding world. The simplification of learning complexity has been commonly assumed in local and traditional ecological knowledge (LEK/TEK) research. Based on a modern learning theory, this article describes learning complexity behind the LEK/TEK held by fishers and farmers in Sweden. It leads to the introduction of the concept of biocultural learning that contributes to this field by giving details to this complexity. From a biographic approach, this research combines case studies, in-depth biographical narrative interviews, participant observations and the analysis of personal blogs and family pictures as data collection methods. This combination reveals the interconnection between professional knowledge about nature, identity construction and emotional bonds to nature. This article highlights the value of giving professional status to LEK/TEK and discusses the need to promote and strengthen biocultural learning in different society sectors.