Southern Fried Science

Inaugural post: issues facing Puget Sound Chinook salmon

February 22, 2013November 2, 2013 Iris 7 Comments

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cat(‘Hello, world!\n’)

I’m Iris, and I used to blog over at From Alevin to Adult. An alevin is a newly-hatched salmon and, as you might guess, my current research is fairly salmon-centric. I’m studying factors that influence estuarine and early marine growth of salmon, and how growth links to overall survival.

Salmon are anadromous, meaning that they move between freshwater and saltwater at different stages of their lifecycle and, as such, they depend on a variety of habitats. Furthermore, salmon are often subject to intense size-selective mortality – meaning that a fish’s growth can determine whether or not it survives. Several studies have shown that the time spent and size gained in estuarine and early marine environments affect overall survival for salmon. Growth is largely determined by feeding success, and faster early marine growth has been associated with higher marine survival for salmon.

So, what could influence salmon feeding in these early life stages? Surely what they’re eating might play a role – where is their food, and how much food is there?

crab zoea — Most juvenile salmon eat primarily zooplankton in these early life stages and switch to a fish-based diet as they grow.

Environmental stressors may affect feeding. High temperature and low-oxygen waters can be inhospitable to salmon. This can physiologically affect the fish so that it does not get as much net energy from its prey, or it can prevent the fish from reaching its prey altogether.

Why a California great white shark scientist opposes CA Endangered Species Act protections

February 22, 2013October 27, 2013 Guest Writer 15 Comments

Conservation, Science

Dr. Chris Lowe is a Professor of Marine Biology at California State University Long Beach, and is Director of the CSULB Shark Lab. He has studied California’s great white sharks for more than 10 years, and has written more than 75 peer-reviewed scientific publications. Dr. Lowe also serves on the Board of Directors for the American Elasmobranch Society, the world’s largest professional organization of shark scientists. The following guest post was also submitted as a public comment to the California Department of Fish and Wildlife.

Comments for consideration on the petition to list white shark as threatened or endangered species:

I am a Professor of Marine Biology and the Director of the CSULB Shark Lab at California State University Long Beach and have been conducting State and Federally permitted white shark research in California since 2002. In addition, as a professional and published shark scientist who has studied a variety of shark species around the world, including white sharks in California, I would like to take this opportunity to express my personal professional opinion in regards to the petition request and the science behind it.

The most preventable shark attack of all time?

February 19, 2013February 19, 2013 David Shiffman 5 Comments

Science

I don’t often cover shark attacks here at Southern Fried Science. They get plenty of news coverage on their own, they’re usually not that relevant from a science and conservation perspective, and they are outside of my expertise and interests. However, some shark attack stories, such as this one, transcend “if it bleeds, it leads” fearmongering journalism and are interesting in their own right.

I’d like to preface this story by saying that shark attacks are extremely rare to begin with (you have a 1 in 5 chance of dying from heart disease and a 1 in 3.8 million chance of being killed by a shark in the United States). If you want to further minimize your chance of being attacked by a shark, most of the few attacks that occur can be prevented by simply swimming close to shore with lots of other people nearby during the day. Even though shark attacks are rare, I still don’t want to minimize the suffering of the few attack victims and their families. With these caveats out of the way, presented below is the fascinating story of what is probably the most preventable shark attack of all time.

Update from the Cayman Abyss

February 15, 2013February 15, 2013 Andrew Thaler 1 Comment

Science

Andrew is currently at sea exploring the world’s deepest hydrothermal vents aboard the RRS James Cook. You can follow along with the adventure at the cruise blog–Into the Cayman Abyss–and on twitter using the hashtag #DeepestVents. Below is a cross post of his first entry Confessions of a Benthic Mercenary – It’s all about connectivity.

Modern deep-sea science is built on broad international collaborations. We share resources, expertise, and ship time. These exchanges allow scientists from around the world to benefit from a global research fleet that includes dedicated oceanographic platforms like the RRS James Cook or the RV Atlantis as well as novel vessels-of-opportunity that could include Norwegian container ships, North Carolina ferries, or Papua New Guinea tug boats. There are small differences between the operation of vessels from different nations – new acronyms, different power supplies, and an enduring disagreement regarding what constitutes a proper biscuit (ask a North Carolinian to take you to Bojangles sometime) – but the rhythm of a ship at sea is dictated, above all else, by the ocean.

The international and interconnected network of deep-sea scientists is how I now find myself, as an American, sailing aboard a British ship, in a role that could best be described as a Benthic Mercenary.

50 Shades of Grey Reef Shark: A Valentine’s Day Special Report on Shark Sex (With Pictures! And Video!)

February 13, 2013February 13, 2013 David Shiffman 5 Comments

Science

As many of our readers prepare for a romantic evening with their special someone (or a Single’s Awareness Day celebration with friends), I invite you to take a few minutes and learn how our toothy friends in the ocean do it. And by “do it”, I mean “do it”. Here are 10 things you might not have known about shark sex.

1) Sharks have external reproductive organs. A male shark has reproductive organs called “claspers” (yes, there are two of them), and females have a “cloaca”. As I regularly tell the high school students who join us for shark research trips, even if you don’t have a degree in marine biology, you’ll quickly recognize what you’re looking at.

A closeup of claspers (male reproductive organs) on a spotted Wobbegong shark. Photo credit: Richard Ling, WikiMedia Commons

Shark DNA Used to Buff Up Aquacultured Fish

February 10, 2013October 28, 2013 Chuck Bangley 3 Comments

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It’s not every day that catching up on scientific literature causes you to almost do a spit-take on your laptop screen. This happened to me recently due to the weird and wild world of aquaculture. Aquaculture is the practice of growing aquatic animals such as fish and shellfish for the purpose of food, and has been held up as both a savior and destroyer of the marine ecosystem. To get an idea of what this generally looks like (at least here in the U.S.), Amy has a whole series of posts on aquaculture operations in North Carolina.

As with land-based farming, aquaculturists are motivated to find ways to increase the food value of their stock. The methods used are varied, from high-protein feed mixes to genetic manipulation. Recently, farmed salmon genetically-modified to grow larger and faster than their wild conspecifics have been approved for human consumption by the FDA, though not without debate. This man-made subspecies was created by modifying the already-existing DNA of the fish, but what if it turned out that simply injecting DNA from a different species could improve the growth and protein output of farmed fish? And what if that foreign DNA came from sharks?

Introducing ScienceOnline: Oceans!

February 1, 2013October 27, 2013 David Shiffman 10 Comments

I am thrilled to officially announce Science Online: Oceans, which will take place in Miami this October! ScienceOnline: Oceans is affiliated with the North Carolina based ScienceOnline organization and meeting, and we hope to incorporate much of what makes those meetings so special, but there is one key difference that regular ScienceOnline attendees should be aware of. ScienceOnline: Oceans will focus exclusively on ocean science and conservation (and, of course, how these topics relate to the internet and social media).

Who can attend? Anyone! Any interested scientist, journalist, student, blogger, communicator, activist, or member of the public is welcome. Due to logistical limits, we will have to cap total attendance at 200 (previously it was 150), including organizers, presenters, and attendees. Registration will open in March, stay tuned!

What to read while you’re at sea: Southern Fried Science’s favorite ebooks for a multi-month research cruise

February 1, 2013February 1, 2013 Andrew Thaler 5 Comments

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AndrewThumb Until March 9, 2013, I’ll be at sea. I love that phrase. At sea. For this expedition, we’re leaving from Jamaica, returning to Antigua, and spending several days on a research program separate from ours. I have a lot of travel and a little downtime to look forward to. When I started going to sea almost a decade ago, this meant that I carried a couple books and dozens of research papers, and traded them around with the rest of the science team, the crew, and the ship’s library.

Now, thanks to kindles and other e-readers, I can carry entire libraries with me, loading them up with all the books I want to read and stockpiling thousands of research papers. This. Is. Awesome.

So, if you find yourself with a kindle and a long stretch of travel time, consider checking out some of my favorite ebooks. I’ve read all of these over the last year and they all look great on an e-reader. This reading list should keep you occupied during the quieter moments of your travels.

Inaugural Post: Fishermen Are Not Evil

January 31, 2013October 28, 2013 Chuck Bangley 1 Comment

Conservation

Hi everyone. I’m Chuck and I used to blog primarily over at Ya Like Dags?, where my main focus was on interactions between apex predators (sharks mostly, but I also occasionally dabbled in other large fish and sea mammals) and those other top marine predators, humans. This was not in the “shark attack” sense, but in the context of fisheries management. Writing about this subject and living it as part of my research have given me valuable perspective on marine science and conservation that I really didn’t have as a freshly-minted Bachelor of Science.

Unfortunately I see more extreme versions of my old perspective show up in countless blog comments, posts, and tweets by perfectly well-meaning people whose only issue is that they’ve fallen for a simplistic, “us vs. them” attitude towards conservation. Consumptive uses of the ocean, such as fishing, are inherently evil and must be opposed. This no-compromise approach sounds cool and may bring in the TV ratings, but is it truly helpful?

Saying goodbye to an old friend: The R/V Cape Hatteras returns home from her final voyage

January 30, 2013 Andrew Thaler

Science

At 0930, January 30, 2013, the research vessel Cape Hatteras made her final voyage through the Beaufort Inlet to dock at Pivers Island. The Cape Hatteras served as the flagship of the Duke/University of North Carolina Oceanographic Consortium for 31 years. During that time she logged more than 5000 days at sea over the course … Read More “Saying goodbye to an old friend: The R/V Cape Hatteras returns home from her final voyage” »