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The bluegill, more commonly referred to simply as parasites, were a parasitic genetically modified off-shoot of the Trill symbionts created to try and cure the symbionts of a terrible disease. The experiments failed resulting instead in a race of psychopaths which the Trill tried and failed to eradicate. From then on the parasites maintained a hatred for the Trill and by various means attempted to destroy them.
- The name bluegill comes from the Star Trek: Customizable Card Game, but was likely drawn from Riker's description in "Conspiracy" of the blue gill that the parasites had.
The Parasites were insect-like in appearance and took control of their victims by crawling down his or her throat and tapping directly into their brain and spinal cord. The process was eventually fatal to the victim.
In addition to an impressively fast crawl speed for such small creatures, the parasites were capable of jumping the height of most humanoids to quickly gain access to the mouth. They had a large set of strong pincers which they used to force their way into more resistant hosts.
The parasites shared the same kind of isoboromine neurotransmitter links with their hosts as Trill symbionts, but, unlike Symbionts, they take complete control of their host. The only physical clue to a parasite's existence is a small barb that protrudes from the back of the host's neck (in later incursions the parasites learned to cover that up by plastimasking it onto the host's skin). The barb acts like a gill, expelling spent gases taken from the host's blood absorbed through pores in the parasite's exoskeleton. Regular parasites have neither eyes or a mouth.
A parasite infected host could be detected by changes in behavior. Hosts tended to develop trembling fingers and rapid eye movement as well as a taste for Klingon and Ferengi food, both of which include vermiform invertebrates. The parasites could access the short term memory of the host, but not the long term, which could give them away as a parasite controlled host would be unable to accurately answer detailed questions about the host's own past. However, even once uncovered, the host is virtually immune to phaser stuns due to the parasites ability to neutralize their victims pain receptors and controlling adrenalin levels. This also gives the host increased strength, making subduing a host difficult.
The parasites could function independently, but it's believed that they prefer to work in hives with a queen telepathically communicating and controlling other soldier parasites, and possibly communicating with other queens. The parasites could be removed from their hosts, but only within three-four weeks of bonding (or less, depending on the species), after which the neurological connections become too complex and the host-body would be killed. Permanent connection with a joined Trill takes less than a day while Cardassians seemed to be immune to infection by the parasites. The exception to this is when the queen parasite is killed; in such a case the soldier parasites release control of their hosts and then drop dead or, indeed, leave their victims voluntarily with no harm to the host. (DS9 novel: Unity; TNG episode: "Conspiracy")
The parasites breed with a structure similar to that of colonial insects.
Each encounter with the parasites was the result of the efforts of one spawnmother. A spawnmother could create thousands of offspring to do her bidding and could use her telepathic abilities to effectively remote control the hosts of her spawn. The spawnmother could produce both queen and soldier parasites. The queens born with implanted young could then spread the colony further infecting more hosts as necessary or desired. The soldiers were incapable of reproduction and took commands from a queen or spawnmothers. (DS9 novel: Unity)
The Parasites were created on an ancient Trill colony on the planet Kurl in the 3rd millennium BC. The Kurlans were a group of joined Trill who set about making a society of only joined persons on their world; unfortunately, something on the planet went wrong and a virus infected much of the population. In a short time, ten percent of the colony had died. As the virus most acutely affected the symbionts, the scientists from the colony went about genetically modifying the creatures to make them more resistant. In the process, the scientists learned that a joining would be more effective if it occurred at the brain stem, so they modified the symbionts with pincers necessary to burrow into the neck. However the experiments were unsuccessful and the virus adapted. After ten years of experimentation, the result was a race of mutated symbionts, which had gone mad from the experience and started taking complete control of their hosts. The Trill resorted to genocide, killing four million of the mutated parasites by remote orbital bombardment of the planet. Then they retreated to Trill, ending the first Trill space age and becoming isolated from the galaxy for centuries - not forgetting what had happened on their colony. But some parasites survived, and they did not forget what the Trill had done to them which was the source of their resentment to the Trill for millennia. (DS9 novel: Trill: Unjoined)
In 2265, a team that included Starfleet Captain Christopher Pike, and Trill representatives Audrid Dax and Jayvin Vod investigated a comet heading towards Trill that was inhabited by a previously unknown lifeform. The team discovered a parasitic lifeform, which took control of Vod, eventually resulting in his death. Also killed were three of the Starfleet officers also on the expedition.
The Vod-parasite revealed to Dax and Pike that his species had a hatred of all humanoid life, and the Trill in particular. The parasite called itself "the taker of gist". After the Vod-parasite was defeated, it was discovered that the parasites were almost genetically identical to Trill symbionts, and that they were en route to Trill in the first step in a long-reaching plan for vengeance.
The Trill government covered up the incident by destroying the comet and allowing the parasite-infected Vod symbiont, whose identity had been destroyed by the Parasite, to die rather than be placed in a new host. (DS9 short story: "Sins of the Mother")
In 2364, several members of Starfleet became increasingly suspicious of Starfleet Command, having noted unusual orders and uncharacteristic behavior from other members of Starfleet. These suspicions culminated with the USS Enterprise-D returning to Earth. There, the crew of the Enterprise discovered that a parasitic alien race had gained control of much of Starfleet HQ. Having uncovered the conspiracy, Captain Jean-Luc Picard and his First Officer Will Riker confronted several parasite-infected Starfleet personnel, and located the spawnmother. Together they killed the Parasite spawnmother, ending the coup. (TNG episode: "Conspiracy")
By the year 2368, the parasites had secretly infested the world of Onglaatu where they took control of the Imperatrix's bonded "moon sister". In that time, they began to use her to create a civil war which was typically against her usual nature. Regardless of their motivations, the bluegills actions remained unknown by the Federation who did not wish to breach the Prime Directive though Starfleet officer Lieutenant Commander Geordi La Forge of the USS Enterprise managed to uncover the parasite infestation. During a skirmish in the council chamber, the parasite queen was killed which led to the enslaved Onglaatu being freed from the bluegills control. With their defeat, the insular people of Onglaatu applied for Federation membership. (TNG comic: "The Broken Moon")
In 2376 the Parasites began another ploy, this time to take over the Bajoran sector. The Bajoran First minister Shakaar Edon was on a tour of Federation space on the planet of Minos Korva when he stumbled across a lone spawnmother parasite who had thought she was the last of her kind. This spawnmother took the opportunity to take Shakaar as host and traveled with him back to Bajor.
On Bajor she started to spawn and take control of hosts all over Bajor and Deep Space 9. Using Shakaar, she instructed Asarem Wadeen to make peace talks with the Cardassians difficult and prolonged to prevent Cardassian interference with her plans. The spawnmother's presence ate away at Shakaar's personality until there was nothing left. Hiziki Gard's assassination of Shakaar alerted Starfleet to the situation and the Bajoran system was locked down with the assistance of a Cardassian force led by Gul Macet.
At some point prior to the assassination she presumably left Shakaar leaving a soldier or queen parasite in her place. This also gave her the opportunity to start a mass spawn, growing far larger than Shakaar would have been able to contain. Even when Starfleet successfully captured a queen, the parasites remained confident that they would win and demanded that all humanoids leave the Bajoran system to them. The spawnmother's eventual goals were to use the knowledge and power of the Bajoran Orbs to strike out at Trill and her allies. It was, however, the orbs that were her eventual undoing. She was located by Kira Nerys in the orb room at Ashalla; facing unwinnable odds, Kira opened all the orb arks, exposing the spawnmother to all eight. In the ensuing orb experience, she was sent by Benjamin Sisko to a void of a realm inhabited by a small number of Jem'Hadar, who promptly slaughtered the creature. With the disappearance of the spawnmother, the remaining parasites abandoned their hosts, ending the attack. (DS9 novels: Unity, Lesser Evil)
The Path to 2409Edit
In the continuity of Star Trek Online, neural parasites are given a different history, as a bio-engineered race created by the Solanae. The Solanae had created the Bluegills as part of the machinations of their masters who were the ancient Iconians. As such, the Solanae, Elachi and the Bluegills all operated as servitors for their hidden masters. By 2409, the Solanae were breeding the neural parasites at an Elachi subspace station in subspace. In that time, the Vaadwaur in the Delta Quadrant were seeking allies in order to return to power. Their search attracted the attention of the Iconians who had the Vaadwaur represented infested with Bluegill parasites so that they could become the hidden masters of the Vaadwaur Supremacy. (STO mission: "What's Left Behind")
The Delta Alliance managed to uncover this link when a crew alongside The Doctor went to the Elachi station to discover the neural parasites true origins. A number of Elachi were infested with Bluegills that battled the Delta Alliance away team but were killed in the struggle. (STO mission: "What's Left Behind")