Cook PF, McBeath SJ, Bricknell IR & Bron J (2010) Determining the age of individual Lepeophtheirus salmonis (Krøyer, 1837) copepodids by measuring stored lipid volume; Proof of principle. Journal of Microscopy, 240 (1), pp. 83-86. https://doi.org/10.1111/j.1365-2818.2010.03417.x
Confocal microscopy has facilitated measurement of stained lipid volume in Lepeophtheirus salmonis copepodid larvae. Quantity of lipid, location and morphology of vesicles may allow an estimate of age and viability.
Journal of Microscopy: Volume 240, Issue 1