Founder’s Briefs: An occasional series where Mongabay founder Rhett Ayers Butler shares analysis, perspectives and story summaries. Among those who cared about freshwater fish — and there were many — Paul Loiselle stood out not for how loudly he spoke and cared, but for how deeply he understood. His grasp of ichthyology was vast, his judgment trusted across both scientific and aquarium hobbyist circles. But what set him apart was his generosity: He shared his knowledge freely, whether guiding a fellow researcher through a taxonomic tangle or helping identify a fish from a snapshot taken in a far-off river. He was, by vocation and temperament, a bridge builder, between hobbyists and scientists, zoos and field researchers, aquariums and conservationists. For more than four decades, Loiselle

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