Fish are Friends Not Food

Great White Sharks feed during the daytime, and have a special mechanism that allows them to sense movement of a fish. It has special sensors that pick up on the movement of its prey, also they have a keen sense of smell and eye sight. All these things determine if a shark is going to attack its prey, which it does by charging it from underneath delivering a fatal bite and either swim away letting it weaken or chomping it up right there. The sharks diet mainly consists of seals, sea lions, fish, other smaller sharks, and elephant seals. Also they will eat dolphins is they can defeat it.

Work Cited: WSWP. Great White Shark: Food&Feeding. Retrieved From: http://www.great-white-shark.com/shark-food.html

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Work Cited

Ball, C. (2012). White Shark Count.  Retrieved From: http://www.ccsa.asn.au/index.php?option=com_content&task=view&id=5542&Itemid=594

Harris. T. H. Great White Sharks and More.  Retrieved From: http://www.sealifepix.com/greatwhitesharks.html

HowStuffWorks,Inc. (2012). Threats to Sharks. Retrieved From: https://greatwhitesbio.wordpress.com/wp-admin/post-new.php

Mackay. S.M. (1/11/97). Shark Case. Retrieved From:http://www1.american.edu/ted/SHARK.HTM

MarineBio.org (June 2012) . Great White Sharks, Carcharodon carcharias. Retrieved From:http://marinebio.org/species.asp?id=38

 Martin, R.M. No Guts, No Glory. Retrieved From: http://www.elasmo-research.org/education/white_shark/digestion.htm

Ritter, B., Adam-Carr, C.,& Fraser, D. (2002). Nelson: Biology 11.

Roesch. B. R. (1997) White Shark Physiology: Warm Bodied and Ready to Go. Retreived from : http://web.ncf.ca/bz050/wsphysio.html

Sewell. T.S. Retrieved From : http://ocean.si.edu/ocean-photos/biomimicry-shark-denticles

 (2012). Shark Breathing: Buccal Pumping and Ram Ventilation. Retreived From: http://science.howstuffworks.com/environmental/life/zoology/marine-life/shark-drown1.htm

(1998-2012). Retrieved From: http://www.sharkfriends.com/sharks/greatwhite.html

Retrieved From: http://australian-animals.net/shark.htm

Retrieved from: http://www.great-white-shark.com/shark-habitat.html

What the White Shark Lives Through

Humans hunt sharks, but they also cause an unsafe environment when the fish for other fish. Sharks get caught on lines or in nets and die out that way. The natural threat is that they cannot reproduce enough young to keep a steady population rate if they die from accidental by-catch. It is also suggested that human suntanning oil or skin products entering the ocean via beaches draws the shark to hunt in grounds much closer to the shore. The mercury content in fish near the shore is great than that way out in the ocean, so these sharks are developing tumors. Since they are the top of their food chain, they do not get eaten by other animals, but it is known that Dolphins and Orcas attack sharks. They do this out of protection or the right for food since all creatures eat a lot of fish. Both the shark and orca eat sea lions and seals.

Work Cited: HowStuffWorks,Inc. (2012). Threats to Sharks. Retrieved From: https://greatwhitesbio.wordpress.com/wp-admin/post-new.php

Guts and Glory

The white sharks digestion system is similar to ours, accept here aren’t as nearly many organs. The food is torn and chewed up by the razor sharp teeth and is immediately swallowed. It travels through a short esophagus where it eventually goes into the stomach by the control of a sphincter. Once in the stomach, the rugae or folds in the lining expand, a shark can eat up to 10% of its body weight. The stomach has HCl which breaks down bones, and Mucus which protects the stomach lining from the HCl. Furthermore, the pancreas has a duct or tube that empty protein digesting enzymes which starts protein breakdown.

The White Shark has a ring valve intestine which the food enters once broken down by the stomach by another sphincter. This where all the food nutrients is absorbed. Then the food is expelled through the anus after  it is as absorbed as it can be.

Work&Image Cited: Martin, R.M. No Guts, No Glory. Retrieved From: http://www.elasmo-research.org/education/white_shark/digestion.htm

A light in a very long tunnel

Although shark finning still occurs there are laws that have put in place to ban Shark Hunting, or use of any part of the Shark in most Shark visited regions. World Organizations have put Great white sharks on their endangered species list, and awareness of shark depletion is set in the media, such as shark week. Guadalupe Island is a patrolled non-hunting island where most of the world’s different species lay, as well as the great white shark.

Image Work Cited : Typeanimal.com (26 April 2012). Great White Shark. Retrieved From: http://www.typeanimal.com/great-white-shark.html

Work Cited: Ball, C. (2012). White Shark Count.  Retrieved From: http://www.ccsa.asn.au/index.php?option=com_content&task=view&id=5542&Itemid=594

Osmosis, in a Shark?

Yes, white sharks have gills which are exterior respiratory organs, and their gas exchange is similar to Osmosis in plants, accept theirs has a bit more bodily function. Sharks have to constantly move to allow flow of water over gills. In the gills of a white shark are filaments with capillaries, deoxygenated blood on one end of the fold and oxygenated blood on the other. The filament runs on either side of the gill slit. As water flows through the gills, the blood flows through those filaments counterclockwise. This way the oxygen rich water hits the deoxygenated capillary and simple diffusion takes place and oxygen enters the white sharks blood vessels and makes its way to tissues. The idea is once the oxygen in water gets diffused, that water is now deoxygenated and flows over the oxygen rich capillary now carrying blood away from the gills and into the circulatory system. This way, the high concentration to low concentration method, like Osmosis, keeps oxygen from diffusing ot of the sharks gills and into the water.

Work Cited: Ritter, B., Adam-Carr, C.,& Fraser, D. (2002). Nelson: Biology 11.

Top of the Food Chain, or NOT.

The decreasing population of the Great White Shark, has long surpassed. This species is now on the endangered species list in many of its habitat locations. Since white sharks are at the top of the marine food chain, then the only answer for the decline of a species that has been around since before dinosaurs is one thing, humans. We constantly snare sharks in tuna nets, but the worst of them all is finning. The Sharks fin is a delicacy in China as it adds texture and flavour to soup, therefore, the Fins of a shark are marketable. This has caused the decrease in population in many sharks, including the great white shark. This action may be done by humans, but it sure is inhumane. Fisherman use the practice of live-finning which means they bait a shark in, capture it, and cut off their fins and then throw it back into the ocean. There is nothing the shark can do now but sink to the bottom and die, especially Great Whites as they need to move to breathe. There as been laws and banning finning the shark as the full carcass is not being used, but many poachers still get away with it, the price is just too much to give up.

Work Cited:      Mackay. S.M. (1/11/97). Shark Case. Retrieved From:http://www1.american.edu/ted/SHARK.HTM

Baby….SHARK!

White Sharks are interesting because they do not just lay eggs and let them hatch, nor are they just born. White Shark pups develop by a method called ovoviviparous. Ovoviviparous is where the white shark pups are developing in eggs where they receive nutrients from the yolk, the strange thing is, they are still inside their mother’s uterus when they hatch. This is also referred to as Aplacental Viviparity.  While still inside the mother, the pups survive by feeding on unfertilized eggs and embryos, this is known as oophagy. The pups are born soon after hatching in litters from 2 – 10 pups. There can be 17! They are 1-1.5 m at birth and males reach sexual maturity after 9-10 years (3.5-4.1 m in length) and females take 14-16 years (4-5m in length). Females take about a year to get pregnant again. There is little to nothing known about white shark conversation but judging by scars on the females fins, it is suggested that the male bites the females fins during insemination so that they are still.

Work Cited :  MarineBio.org (June 2012) . Great White Sharks, Carcharodon carcharias. Retrieved From:http://marinebio.org/species.asp?id=38

HowStuffWorksInc. (2012). Great White Shark Reproduction and Conversation. Retrieved From :http://science.howstuffworks.com/environmental/life/zoology/marine-life/great-white5.htm

Image Work Cited:

OceanLife4Kids. (2009). Great White Sharks. Retrieved From: http://oceanlife4kids.webs.com/greatwhitesharks.htm

How Old Can Whitey Get?

It is believed that most sharks live on average up to thirty years of age, which is pretty old for just a fish. There has been recordings of GWS reaching the age of 50 years! That’s older than my parents! Crikey!  A main reason for the the jump difference in lifespan is because the sharks take so long to reproduce, and with humans hunting them for their fins, it leaves less adult sharks ( used for largeness of fins) to reproduce, therefore it has to be the younger ones. Since gestation can be almost two years later, that makes less litters being put out there, and the pups that do survive barely stand a chance once they’re big. Great White Sharks simply do not survive in captivity as they constantly need to move to breathe and have access to high fat food (seals, sea lions, other sharks).

Work Cited:            Mackay. S.M. (1/11/97). Shark Case. Retrieved From:http://www1.american.edu/ted/SHARK.HTM