Cinematographic video tape slow-motion analysis confirmed that in Daphnia, food particle retention occurs through assembling, not sieving. Particle abstraction is achieved by assembling and packing rather than by sieving. A straining action which requires energy, poses an ecological disadvantage. The achievement of internal fluid flow sieving through a mesh may be therefore a physiological disadvantageous trait. Sieving action of internal current could create flow irregularities and turbulence. Filtration induces laminar flow interference, resulting in a stirring effect. The two trunk limbs dangle freely within a chamber space where food particles are gathered. The food particles assembling and packing mechanism within the feeding process improves energy savings and animal resilience by locomotion improving vulnerability.
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