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Narcinidae

Narcinidae. Narke =paralysis Numbfish. Characteristics. Round flat disc w/ soft edges no denticles or thorns Large spiracles Prominent caudal fin 1 st dorsal fin =2 nd dorsal fin Mouth tubular and protractile

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Narcinidae

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  1. Narcinidae Narke =paralysis Numbfish

  2. Characteristics • Round flat disc w/ soft edges no denticles or thorns • Large spiracles • Prominent caudal fin • 1st dorsal fin =2nd dorsal fin • Mouth tubular and protractile • Bioelectrogenesis in electric organs behind eyes for sensing and stunning prey • 8-37 volts • Accessory electric organ • electroplaques • Nocturnal

  3. Family Narcinidae • 9 genera w/ 40 spp. (last three often included in separate family) • Benthobatis –blind rays • 3 spp. • Crassinarke – sleeper torpedo • 1 spp. • Diplobatis- painted ray • 4 spp. • Discopyge –Apron ray • 1 spp. • Heteronarce –soft electric ray • 4 spp. • Narcine – lesser electric ray • 19 spp. • Narke • 3 spp. • Temera • 1 spp. • Typhlonarke • 2 spp.

  4. New species • 2003 Benthobatis yangi • 2003 Narcine atzi • 2002 Narcine insolita • 2002 Narcine oculifera • 2001 Narcine leoparda

  5. distribution • Sandy or muddy shallow waters • Atlantic • Pacific • Indian Ocean • Temperate to subtropical waters • Narcine -circumtropical concentrated in Indo-West Pacific • Benthobatis -Atlantic and Indian • Diplobatis -E. Pacific and W. Atlantic • Discopyge- S.W. Atlantic and S.E. Pacific • Crassinarke- W. North Pacific • Heteronarce –W. and C. Indian Ocean

  6. Diplobatis ommata

  7. Narcine brasiliensis

  8. Crassinarke dormitor– sleeper torpedo

  9. Diplobatis pictus- painted ray

  10. Discopyge tschudii –Apron ray

  11. Feeding • Tubular mouth extended to suck up benthic prey • Polychaete worms • Crustaceans • Small teleosts • anemones

  12. Reproduction • Ovoviviparous • Nourished w/ yolk them histotroph • Young born w/ ability to produce electrical charge

  13. IUCN red list • Bycatch of bottom trawl fisheries • Fish meal • 2 spp. Off S. America • Discopyge tschudii – neat threatened • Narcine leoparda – near threatened • 6 spp. listed as vulnerable • Benthobatis kreffti, 4 spp. Of Diplobatis

  14. Lesser electric ray • Narcine brasiliensis • Distributed in shallow W. Atlantic; common in Gulf of Mexico • Color varies from brown to orange w/ rings or ovals on dorsal surface • Disc width 20cm, length 45 cm • 17-34 tooth rows in each jaw • Conical, and sharp

  15. Lesser electric ray

  16. Lesser electric ray

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