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Brazilian and German scientists have completed a collaborative project to sequence and analyze the whole genome ofArapaima gigas, a giant freshwater fish known in Brazil as pirarucu and elsewhere as arapaima or paiche. Its growth rate is the fastest among known freshwater fish species. Its natural distribution covers most of the Amazon River basin in Peru and Brazil. The research led to discoveries that help determine sex at an early stage, facilitating the separation of female and male fry [...]