Tag Archives: Marine Biology

Move over, 3D Movies. 3D Printing is the New Trend.

Do you remember the quote “You wouldn’t download a car”? It was the message that accompanied the dark, serious commercial on piracy. But with the wonders of technology, something like that is actually possible as silly as that sounds. How? 3D printing.

3D printing has been around since the 1980’s but has really started to take off more recently in the 2010’s due to a reduction in price and availability of the 3D printer. Although the 3D printer shares its name with the commonly used 2D computer printer, they are fundamentally quite different as the 3D printer prints out material in layers, one over another. Due to the versatility of the 3D printer, science has been utilizing 3D printers in a wide variety of ways, and this progressive stance has made an impact on many fields.

Regular 3D Printer (Photo by: Eva Wolf, Source: WikimediaCommons)

One example of science’s venture into 3D printer comes in the form of medical science, as 3D printer allows for the creation of things like the human liver. Obviously, the 3D printer doesn’t just magically make a kidney appear out of nowhere, so how does it do it? The San Diego Company, Organovo has been making a great deal of progress on it, and they are doing this by printing out a mass of human cells which can be thought of as the ink. These human cells cluster to form structures, before adding another layer. These layers eventually fuse to form the 3D shape of the organ.  Although that description is a bit simpler than what actually happens, it gives a brief idea of how it is done.

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Another way science has been utilizing 3D printers is in a field like marine-ecology. 3D printers are capable of recreating coral reef that can be placed into damaged marine ecosystems. These artificial coral reefs provide a source of habitat and helps improves the health of marine life there. This is exactly what is happening in the region of the Persian Gulf, an area where overfishing has been negatively impacting the ecosystem there. The use of artificial reef is bringing back balance back into the area.

Coral Reef (Photo by: Nick Hobgood Source: WikimediaCommons)

Those two examples give just a quick glimpse of what 3D printing can do and although it isn’t too widespread at the moment due to the price and the tech of the 3D printer. Over time, as price decreases and tech goes up, 3-D printing will continue to make its mark on science.

– Jeffrey Chen

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Catch-and-Release rather than Catch-and-Kill!

The research team angles Tiger Shark up to the boat to begin samples.

It is obvious that any kind of living animal would respond to stress through catch-and-release fishing. Scientists at the University of Miami (UM) Abess Center for Ecosystem Science and Policy and the Rosenstiel School of Marine and Atmospheric Science investigated how several species of coastal sharks respond to these stresses as a result.

The five shark species being experimented on through catch-and-release fishing were the hammerhead, blacktip, bull, lemon and tiger sharks. This was taken place in South Florida and Bahamian waters. Researchers took blood samples to examine stress, including pH, carbon dioxide and lactate levels, conducted reflex tests, as well as used satellite tags to look at their post-release survival.

The blood lactate levels of sharks were hugely affected due to them resisting to be caught, which is similar to what happens to humans during intense or exhaustive physical exercise. This is linked to mortality in many species of fish. The study showed that the hammerhead exhibited the highest levels of lactic acid build out of all five species, followed by the blacktip, bull, lemon and tiger sharks. The study even showed that after release, hammerheads were prone to delayed mortality. Hence, the hammerhead sharks are more sensitive than the other sharks whereas tiger sharks can withstand or recover from even the minimal catch and release fishing a lot better.

This study not only shows the different effects on catch-and-release fishing on the different types of sharks but also conveys that it is not guaranteed that all of these species would survive from the encounter even if it swims away from the area. This has serious conservation implications because those fragile species might need to be managed separately, especially if we are striving for sustainability in catch and release fishing.

Many of the shark populations worldwide are declining due to overfishing. In order to conserve this population, the process of catch and killing is now slowly being switched to catch and releasing. Therefore this study helps fisherman make informed decisions on which sharks make good candidates for catch and release fishing, and which do not, such as the hammerheads.

 

Yuri Tomura

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