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Trill symbiont

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Trill Symbionts, also known as swimmers, are small animals which can either live within Trill humanoid hosts, or Symbiont pools on Trill.

A host of a trill symbiont gains access to the memories of the symbiont; therefore, also those of all of the previous hosts.

HistoryEdit

The existence of the symbionts was a closely guarded secret for centuries. (DS9 anthology: The Lives of Dax)

Well into the 24th century, the relationships between Trill humanoids and symbionts was a source of much political and social upheaval on the planet Trill and beyond. (ST comic: "Divided We Fall")

OverviewEdit

Trill symbiont communication

Symbionts communicating in the Caves of Mak'ala pools.

When a symbiont was not inside a host body, they made use of electrochemical signals to communicate with others through the liquid in which they lived. A joined symbiont was also capable of communicating with its non-joined counterparts, by being submerged in the fluid breeding pools on the Trill homeworld. This provided a direct form of communication between the two, but not on the same level of sharing knowledge as that which a Joining was capable of providing.

While typically symbionts only communicated with and took Trills as hosts, it was possible for them to communicate with Humans, at least through extended contact. This was done through matching the symbiont's bioelectric patterns with those of the other individual. However, this required direct tissue contact between the nerves of the person with those of the symbiont. (DS9 novel: Time's Enemy)

Sometimes, symbionts were born with a rare biochemistry that made them unfit for joining. This occurred only once every hundred years or so. The last known symbiont with this affliction was Marh, who attempted to join with Trill Guardian, Aylim, in the 2270s. (ST - New Worlds, New Civilizations short story: "Aversion")

The bluegill parasites are genetically modified offshoots of the vermiform Trill symbionts.

As symbionts grew older, they eventually became unable to take hosts and would sink to the bottom of the pools, where they would become caretakers for the Annuated. Eventually, these symbionts would grow to become Annuated themselves over a period of 20,000 years or more (DS9 novel: Trill: Unjoined).

Mirror universeEdit

In the mirror universe, the Trill Symbionts were infected with a hostile parasitic intelligence. Emperor Spock ordered all the symbionts, save for Dax, exterminated, in order to stop them becoming a threat to the Empire. This has left Curzon Dax as the only joined Trill. (TOS - Mirror Universe novel: The Sorrows of Empire)

In 2379, Curzon passed away and the symbiont was joined to Terran Rebellion member Ezri Tigan. (ST - Mirror Universe novel: Rise Like Lions)

See Also: Trill symbionts for a list of symbionts.

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