Thin Body Profile Means Most of Its Mass Is Water

This giant is mostly water despite its size.

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Neutral buoyancy reduces energy expenditure for organisms living in open water columns.

Like many marine fish, oarfish bodies contain a high proportion of water, contributing to buoyancy and flexibility. Their thin cross-section spreads mass along length rather than thickness. Although they can weigh hundreds of kilograms, much of that mass is fluid-rich tissue. This composition supports neutral buoyancy in midwater habitats. Extreme length does not require dense musculature like that of fast pelagic predators. The giant is elongated fluid more than compact muscle. Density shapes design.

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Imagine lifting a bus-length ribbon that feels less like solid beam and more like heavy, flexible hose. In water, buoyancy offsets gravity, masking true mass. Out of water, the weight surprises observers. The composition highlights adaptation to suspension rather than sprinting. Form follows environment.

Water-rich tissues also influence decomposition and nutrient release after death. Carbon stored in fluid biomass eventually descends to deeper layers. The same composition enabling glide contributes to ecological cycling. Even structure participates in planetary processes. The ribbon dissolves back into system.

Source

NOAA Ocean Exploration

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