IMES

IMES

Friday, February 19, 2016

Victoria UR- "They caught A Shark, Not THE Shark"

Found in an article titled Satellite Tagging: Expanded Niche for White Sharks a study using pre-dated satellite tags set on six different white sharks. It revealed the travel paths of each shark, as well as "pressure, temperature, and light-level data taken at 2-minute intervals" giving insight into where white sharks go, what temperature ranges they can survive in, and how often they visit the shorelines, near human activity.

Boustany, A. M., Davis, S. F., Pyle, P., Anderson, S. D., Le Boeuf, B. J., & Block, B. A. (2002). Satellite   tagging: Expanded niche for white sharks. Nature, 415(6867), 35+. Retrieved from   http://go.galegroup.com.db06.linccweb.org/ps/i.doid=GALE%7CA187492037&v=2.1&u=lincclin_ccla&it=r&p
=AONE&sw=w&asid=8693647c898749299e71a216bb0e9c3a

Tagged white shark
(Great White Sharks are only called white sharks in the science community because there are not another white shark by name, so the "great" is not needed)
In another article called Vulnerability of the Oceanic Whitetip Shark to Pelagic Longline Fisheries, 11whitetips were tagged and tracked with pop-up satellelite archival tags (PAT)



Table 1.  Meta data of the oceanic whitetip sharks tagged in the western Atlantic Ocean.
Information from 8 of the 11 tagged sharks and when the tags popped up


     Tolotti MT, Bach P, Hazin F, Travassos P, Dagorn L (2015) Vulnerability of the Oceanic Whitetip Shark to          Pelagic Longline Fisheries. PLoS ONE 10(10):e0141396. doi: 10.1371/journal.pone.0141396



For many catches, the method of actually catching the specimen can vary greatly depending on the target species. For the most part, a long line is used for a great range, with many hooks, giving a greater chance of catching multiple sharks, and a variety of species. A drumline can also be used, which consists of an anchor and a buoy with a long hook centered in between the anchor and buoy, which can only catch one specimen and limits total catch. Also, a drumline is usually used in deeper waters where a longline can be short or long depending on which line length is used in the water.


Drawn longline, shows how many possiblilities as well as the chance of bycatch.

Drumline

1 comment:

  1. Victoria--I'm confused by your post. It's more like you copied portions of other's articles and pasted them into the blog. I'm also wondering about your citations--they, too, seem strangely included. I'm not even clear on what the goal of your post was; there is no 'story' here.

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