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Gill Maggots What is it? Gill maggots parasitic copepod in the genus Achtheres Parasitic copepod from Cherokee Reservoir, TN largemouth – Jim Negus Photo by Jim Negus, TWRA, Norris Reservoir Striped Bass, December 2003 Umbrella shaped bulla Modified maxillae Reduced mouth parts

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Presentation Transcript
what is it
What is it?
  • Gill maggots
  • parasitic copepod in the genus Achtheres

Parasitic copepod from Cherokee Reservoir, TN largemouth – Jim Negus

Photo by Jim Negus, TWRA, Norris Reservoir Striped Bass, December 2003

slide4

Umbrella shaped bulla

Modified maxillae

Reduced mouth parts

No legs and little segmentation

Egg sacs

Female

* Mature males are much smaller and are free swimming

life cycle
Life Cycle
  • Females produce eggs in eggs sacs
  • Nauplii stages are passed within the egg sac
  • First copepodid stage is released from the egg sac and is free swimming plankter.
  • After a short while they attach to fish and mature to adults
  • Females remain attached, males mature and become free swimming.
  • Free swimming males attach to females during copulation.
myths
Myths

1) They kill fish. NOT!

2) They render fish non-eatable. NOT!

3) They spread to people who swim in the lake. NOT!