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Nurse sharks (Ginglymostoma cirratum)
The nurse shark is a common inshore bottom-dwelling shark, found in tropical and subtropical waters on the continental and insular shelves. It is frequently found at depths of one metre or less but may occur down to 75 m. Its common habitats are reefs, channels between mangrove islands and sand flats. It occurs in the Western Atlantic from Rhode Island down to southern Brazil; in the Eastern Atlantic from Cameroon to Gabon (and possibly ranges further north and south); in the Eastern Pacific from the southern Baja California to Peru; and around the islands of the Caribbean
Nurse sharks are nocturnal animals, spending the day in large inactive groups of up to 40 individuals. Hidden under submerged ledges or in crevices within the reef, the nurse sharks seem to prefer specific resting sites and will return to them each day after the night's hunting. By night, the sharks are largely solitary; they spend most of their time rifling through the bottom sediments in search of food. Their diet consists primarily of crustaceans, molluscs, tunicates, sea snakes, and other fish, particularly stingrays.
They are thought to take advantage of dormant fish which would otherwise be too fast for the sharks to catch; although their small mouths limit the size of prey items, the sharks have large throat cavities which are used as a sort of bellows valve. In this way nurse sharks are able to suck in their prey. Nurse sharks are also known to graze algae and coral.
Nurse sharks have been observed resting on the bottom with their bodies supported on their fins, possibly providing a false shelter for crustaceans which they then ambush and eat.
Nurse sharks are able to respire while stationary by pumping water through their mouths and out gills.
Atlantis Marine World Aquarium Riverhead New York
Setting up for Saltwater etching 63/365
I have all the components needed for electric saltwater etching except, I now realize, the right size container to hold it.
I spent an hour looking through the house for something not too big, not too small and..didn't find it.
I'm not sure this is going to be any easier than just using the ferric chloride, which I've done and find it easy. But I had this art jewelry magazine article that spells it out, plus we had an aquarium pump that we never used, so the full cost of this is about $6. Thought I'd give it a try.
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