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Gill Maggots

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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Gill Maggots

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  1. Gill Maggots

  2. 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

  3. 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

  4. 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.

  5. Recent Reported Infestations

  6. Myths 1) They kill fish. NOT! 2) They render fish non-eatable. NOT! 3) They spread to people who swim in the lake. NOT!

  7. SCDNR Research

  8. The End

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