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 Post subject: SCUBAMART INDO <Bobtail Squid >
PostPosted: Fri Dec 27, 2013 4:58 pm 

Joined: Mon Aug 12, 2013 1:54 pm
Posts: 126
SCUBAMART Mangga Dua Indonesia

Hawaii Bobtail squids also known as Euprymna scolopes is a species of bobtail squid in the family Sepiolidae. It is native to the central Pacific Ocean, where it occurs in shallow coastal waters off the Hawaiian Islands and Midway Island. The type specimen was collected off the Hawaiian Islands and is deposited at the National Museum of Natural History in Washington, D.C

Bobtail Squids lives in a symbiotic relationship with the bio luminescent bacteria Vibrio fischeri, which inhabits a special light organ in the squid's mantle. The bacteria are fed a sugar and amino acid solution by the squid and in return hide the squid's silhouette when viewed from below by matching the amount of light hitting the top of the mantle (counter-illumination).

Bobtail Squids serves as a model organism for animal-bacterial symbiosis and its relationship with V. fischeri has been carefully studied.

The light organ has an electrical response when stimulated by light, which suggests that the organ functions as a photoreceptor that enables the host squid to respond to V. fischeri's luminescence.

Extra-ocular vesicles collaborate with the eyes to monitor the down-welling light and light created from counter-illumination, so as the squid moves to various depths it can maintain the proper level of output light.

Acting on this information, the squid can then adjust the intensity of the bio luminescence by modifying the ink sac, which functions as a diaphragm around the light organ. Furthermore, the light organ contains a network of unique reflector and lens tissues that help reflect and focus the light ventrally through the mantle.

The light organ of embryonic and juvenile squids has a striking anatomical similarity to an eye and expresses several genes similar to those involved in eye development in mammalian embryos (e.g. eya, dac) which indicates that squid eyes and squid light organs may be formed using the same developmental "toolkit".

As the down-welling light increases or decreases, the squid is able to adjust luminescence accordingly, even over multiple cycles of light intensity.

Hope you guys will like it.

Have a nice day and Happy New year!

< Plan your dive,dive your plan >

D'X Mike Ooi
PADI Divemaster #323232

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