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Horn Shark Eggcase

Horn Shark Eggcase
Photo Information
Copyright: Manyee Desandies (manyee) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 3089 W: 230 N: 6774] (23770)
Genre: Animals
Medium: Color
Date Taken: 2005-10-22
Categories: Fish
Camera: Canon Powershot S1-IS
Photo Version: Original Version
Theme(s): Underwater Wonder World 2 [view contributor(s)]
Date Submitted: 2005-11-01 10:42
Viewed: 7833
Points: 14
[Note Guidelines] Photographer's Note
How nature devises these wonderous shapes never ceases to amaze me. What better form if you want to wedge your egg into a crevice to keep it from floating away in the ocean's swift currents?

This shot was taken at the Monterey Bay Aquarium.

Heterodontus francisci

While sleeker sharks rule the open waters, horn sharks hide out in the shadows of the seafloor. They’re not graceful swimmers and don't move around like their streamlined kin—in fact, sometimes horn sharks use their strong pectoral fins to crawl along rocks.
These small, elusive sharks prefer shallow waters less than 40 feet deep. They spend their days hiding under ledges, in caves or among kelp and other seaweeds; they hunt at night. Horn sharks feed on seafloor invertebrates, especially sea urchins and crabs, and occasionally on small fishes.
The horn shark’s average length is just over three feet, and it’s named for its large fin spines.?
Species Information
Diet: crustaceans, sea urchins, small fishes, molluscs 
Size: to 4 feet (1.2 m) 
Range: Central California to Baja California 
Relatives: bullhead sharks 
Conservation Notes
Caught by divers for sport and for their spines, horn shark populations have declined in southern California in areas with intense diver activity. Their spines are made into jewelry. Although there’s no commercial market for horn sharks, they’re accidentally caught as bycatch, usually in crab traps, gillnets or trawling nets. 
Cool Facts
Slow and sluggish, horn sharks spend their days hidden in crevices or among rocks—unseen for the most part since their coloration matches the muddy browns and greens of their surroundings.
The scientific name Heterodontus is the Greek word for "different teeth." The teeth lining the front of the horn shark’s jaws are sharp and used for grasping prey; the teeth in the back are flat and molarlike, useful for crushing shellfishes. The common name "horn" refers to the spines in front of each dorsal fin.
Females lay spiral egg cases, which they wedge into crevices—this makes the egg cases stay put. Each egg case contains one pup, which takes between six and nine months to hatch. 


marhowie, Leace, liquidsunshine, greghume, TAZ, cecilia has marked this note useful
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Critiques [Translate]

  • Great 
  • red45 Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 2636 W: 74 N: 9091] (31094)
  • [2005-11-01 10:55]

Amazing shot of amazing nature Manyee! Incredible shape. Very interesting note. Great poost.

Very interesting stuff Manyee. Your shot is very sharp & detailed. And with this great information about the horn shark an excellent post. Very well done. Thank You.

Very good shot Manyee,
Good colour, detail and sharpness.
Well composed and good exposure.
Thanks for posting. Sorry for the rushed critique, one of those busy nights!!
Had time to read notes, very interesting.

Beautiful capture of the egg casing, Manyee. The reflections almost make it appear to be metallic.

Nice clear detail, well taken shot.


  • Great 
  • TAZ Gold Star Critiquer/Silver Workshop Editor/Gold Note Writer [C: 2241 W: 47 N: 3167] (10926)
  • [2005-11-02 4:22]

I appreciate this beautiful and interesting shot ! Congratulations and thanks for sharing.

" the Life is so rare in the universe and the Nature so precious, take care of them ! " Christian...

Wonderful, fantastic texture, colour and composition...
Well taken...

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