Seems low. About the same as number of individual krill they might eat when each krill itself must have multiple thousand of micro and nano plastic in it. Must be some lower bound cutoff point, just like that hilarious estimate a few years back the ocean contains billions of micro plastic, when estimates of the Baltic sea are in the hundreds of quadrillions and sediment at the bottom of the Mediterranean contains 2 million plastic pieces per square meter.

Why this matters: recent studies of the beached members of another whale species around Japan show unusually high levels of systemic amyloidosis, particularly in the gastrointestinal tract. Amyloidosis is the deposition of misfolded protein (most notably produced by bone marrow in mammals) and other studies have shown nanoplastic can increase amyloid deposition (makes sense as the nano particles can act as seeds in protein fibrillation, or formation of misfolded protein fibers). It matters to all species on earth as the 10 billion tons of plastic (+.5 billion annually) continue to break down and the plastic disseminates and increases in concentration through the trophic web.