Access the paper here. This study tested the hypothesis that growth increments in larval largemouth yellowfish Labeobarbus kimberleyensis and smallmouth yellowfish L. aeneus from the Orange–Vaal river system, South Africa, are deposited daily. The periodicity of increment formation was determined by regular sampling and counting of increments deposited in the otoliths collected from a total of 52 smallmouth and 41 largemouth laboratory-reared larvae. Increments were counted using a compound light microscope under transmitted light at 100 …