Every atlantic bluefin tuna is a stack of tissues that must agree under season, prey and human pressure.
Meters below repeat the six atlas scores as gauges; they are relative marks, not laboratory certificates.
Systems
Support and integument
A fusiform thunnid with retractable fins and a keel. Rete mirabile keep swimming muscle warm; the heart is built for a high-output cruise.
Feeding apparatus
Schooling forage fish and squid, taken at speed. Fat deposited for a sashimi market is the same fat that funds a transatlantic spawn. The feeding kit sets the ecological-role score relative to the other 23 types.
Respiration and circulation
Gas exchange and blood flow are tuned to the atlantic bluefin tuna energy budget -- dive, hover, sprint or bulk browse -- not to a generic vertebrate template.
Senses and neural control
Vision in clear pelagic light and a lateral line for school chaos. Heat in the eye and brain is part of the thunnid hunting kit.
Reproduction and ontogeny
Replacement rate is the hidden resilience number. A price per kilogram that outruns patrol boats. Slow rebuilding if a year-class is seined for cages.
Thermoregulation and salt/water
Climate and osmoregulation bound where a atlantic bluefin tuna can close its daily budget. Field sites in the English-speaking world still measure that envelope first.
Relative meters
Hotspots
Primary weapon or tool
The bill, teeth, trunk, pouch or talon that field guides name first -- and that trade or conflict usually targets.
Energy store
Fat, cache, crop or bamboo hours that decide whether a season closes.
Natal or breeding site
A redd, eyrie, den, anemone or ice lair -- often a single-point risk (Izumi, Natron, Gir).
Sensory organ
Vision in clear pelagic light and a lateral line for school chaos. Heat in the eye and brain is part of the thunnid hunting kit.
Human interface
Hunt, tourism, film or quota -- the surface where atlantic bluefin tuna biology meets English-language law.
Tissues & materials
Keratin and integument
Feathers, fur, baleen or skin plates -- tissues, not metals. Moult and wear are the maintenance cycle.
Bone and cartilage
Load paths for stoop, lunge, knuckle-walk or hover. Marrow and pneumatic bone differ by family.
Muscle and tendon
The expensive tissue that speed and intelligence scores only hint at.
Fat, oil and glycogen
Stores that migration, fast and lactation spend. A market for those stores (oil, ivory, fin) is a historical threat.
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