Heartbeat, digestion, and other self-regulating bodily functions are governed by the

ecological efficiency: % of usable energy transferred as

biomass from one trophic level to the next typical is 10% efficient (90% of

energy is lost),is diagramed as the pyramid of energy flow. then osprey eagle

are tertiary consumer and the shrimp are primary consumer, so to balance

mass of shrimp (1/0.1) / 0.1 = 100 kg 

it is a limiting nutrient limited by a single nutrient in the ecosystem, & the single goes very slow.