Particle ingestion by filter-feeding Galilee Saint Peterˈs fish Tilapia galilaea increased as a function of particle size, leveling off when particle diameter exceeded 20 μm. Ingestion rates by this cichlid also increased with particle concentration, asymptotically approaching maxima of 4,785 and 84,746 particles˙fish −1˙min−1 for small (3.9–6.0 cm standard length, SL) and large (12.6–14.3 cm SL) fish, respectively. Surgical removal of gill rakers and microbranchiospines did not affect particle ingestion rates or selectivity.
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Drenner et al. (1987) studied this question.