Hadal fish- Fish that are found in the Hadal Zone, about 6000m to 11,000m underwater.
Hadal trench- Hadal trenches account for the deepest 45% of the oceanic depth range and host active and diverse biological communities.
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| Figure 2. Images of liparid Pseudoliparis amblystomopsis at 7703 m in the Japan Trench taken from the baited video lander. (a) View of an aggregation of P. amblystomopsis at bait 5 hours and 30 minutes after touchdown. (b-d) Sequence of images 1.0 second apart showing a spiral swimming pattern of a small individual of P. amblystomopsis with the (b) dorsal, (c) flank, and (d) ventral sides of the fish in view (indicated in the red circle). (e-g) Typical postures when individuals were not actively feeding or swimming and presumed to be resting. In panel (g), the bait was covered by individuals of large amphipods, including Eurythenes species, sandwiched between two stationary individuals of P. amblystomopsis. All scale bars are 10 centimeters. |
Summary:
A video camera was put 1m above the ocean facing toward the bait that was recently put in, its field of view is 0.35 square meters. The bait contained approximately 0.5 kilograms of mackerel. The fishes that came to the bait were small, having a length of 10cm to 12cm long. 15 species, belonging to 6 families, were found eating the bait in the hadal depths. There was a maximum of 20 fish within 6 hours of videotaping. Most of the fish that were found in the camera's range were resting or feeding on the bait, the rest were swimming in spirals. Hadal fish are mostly reproducing in hadal trenches, which over 6000m below sea level, but it is clearly unlikely compared for the size of the fish, which is relatively small.
Discussion:
I chose this topic because it was the first topic that interested me. I was amazed that fish that are as small as 10cm can live 6000m below sea level. Also, they should improve the radius of the camera view so the scientist can improve the results so it can be more accurate. More bait can also be added to attract more fish so they can be viewed under the camera.
Questions:
What are the physical traits of the hadal fish?
What are the mental traits of the hadal fish?
What can be done to increase the accuracy the tests taken by the scientists?
Source:
Alan, Jamieson J, et al. "A Large Aggregation of Liparids at 7703 Meters and a
Reappraisal of the Abundance and Diversity of Hadal Fish." Bioscience: n.
pag. EBSCO Animals. Web. 14 Oct. 2010. <http://puffin.harker.org:2092/
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Nice job Albert! I also think its pretty cool that fish so small can live so deep underwater. However, I don't think I really understand the article. You might want to elaborate more on what caused scientists to attempt this kind of experiment and what their thoughts were behind it, like what they were trying to examine. You might also want to expand a bit more on just the general significance of this discovery. Another thing is that wouldn't it be more shocking if the Hadal fish didn't come in a group? Most fish are already known to travel within schools, and if these Hadal fish actually don't travel in schools then isn't it possible that they were all simply attracted to the bait the scientists had left? Overall, good job, but in the future you might want to elaborate just a bit more on the significance and what the data represents, because right now your blog is a little difficult to understand.
ReplyDeletei have a few questions. Are they using a microscope, or like a telescope, to see the fish at the bottom? And how big are the fish in actual size. I would really like to know more about the fish and its life. I think that you also could of included more in the summary about more things they discovered if they do. I am really interested in this article and you did a great job.
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