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What are skates and how are they different from rays?

April 17, 2012 by Leave a Comment

Recently, a subscriber wanted to learn more about skates. Great question since many of us think of ‘roller’ when we think ‘skate’. Skates are a species that often get overshadowed by rays, especially considering rays tend to be boldly colored while skates tend to be rather dreary and drab in coloration. Rays are also found closer to the coast and skates prefer deep water so we may be more familiar with running into (or focused on learning to avoid) rays. However, there are exceptions to those generalizations within the 100 species of skates and 240 species of rays found worldwide.

They’re both flat diamond-shaped fish with their mouths on the underside of their body. Both of their body types can be described as dorsoventral. Skates and rays are cartilaginous fish, like sharks and chimaera, which all make up the class Chondrichthyes (Con-drick-thees). Cartilage is the material that makes up our nose and ears and is more flexible than bone. Skates and rays  have modified fins, resembling wings, and often look as though they are flying through the ocean.

Here are six general guidelines for differentiating a skates and rays.

  • The pelvic fin of skates is divided into two lobes, while the pelvic fin of rays is a single lobe.
  • The tail on skates lacks a stinging spine. Rays have a distinct, saw-edged spine found midway along their body length. (When swimming in the habitat of stingrays it is important to remember to do the ‘stingray shuffle‘.)
  • Many species of skates have bucklers (thorn-like scales along the mid-line of their back and tail. Rays typically have no bucklers.
  • The tail of skates is rather thick and compact, while rays typically have a slender and long tail.
  • Male skates have enlarged scales near their eyes and wingtips, known as ‘malar’ and ‘alar’ spines.  Male rays do not have these scales.
  • Skates live in cold waters, while rays prefer warm seas and rivers.

For more information about skates and rays, check out the ReefQuest Centre for Shark Research.

Photo (c) www.animals.howstuffworks.com

Filed Under: Fish, Skates and Rays Tagged With: , , ,

An important call for more forage fish to remain in the sea

April 16, 2012 by Leave a Comment

A report titled “Little Fish Big Impact”, written by the Lenfest Forage Fish Task Force, came out earlier this month recommending that the amount of forage fish (e.g., menhaden, herring, shad) that we take from the ocean should be cut in half. However, since forage fish have an annual value world-wide of $5.6 billion dollars and are almost 40% of the world’s commercial fish catch these suggestions might be a tough sell to get passed through many decisions makers. But, here is why it is important we do.

You may not typically think of forage fish, also know as ‘bait fish’, as being a high commodity for fishermen or as playing an imperative role in the ocean – but, they do indeed! It’s surprising how much these little fish play a role in our daily lives.

Within the marine food web we begin with the tiny microscopic phytoplankton (plants that get their energy from the sun). Phytoplankton are  then in turn grazed upon by tiny copepods and  they are then fed upon these forage fish and crustaceans that are fed on by larger fish (e.g., striped bass, bluefish) that are then fed upon by the top predators (e.g., tunas, swordfish) that then feed us. Easy, right? Well, Dr. Daniel Pauly pointed out that within fisheries what is happening today is an imbalance of ‘Fishing Down the Marine Food Web’.

Time increases toward the right along the blue arrow. Scale on the right gives the trophic level in the food web. (Pauly, 2003)

This is the concept that when top predators are removed smaller fish become more of a target. Which would mean that the average trophic level of the food web would shift (Trophic being the level an organism occupies within a food chain). Specifically, forage fish are the primary source of protein for penguins, marine mammals, cod, salmon, tuna, and even puffins. We use these species for the production of fish oil supplements, food for livestock, and food provided to the fish we’re farming via aquaculture.

The Lenfest Report provides information and recommendations to fisheries managers in a three-tiered approach that the Task Force says was lacking prior, which is why we’ve currently been able to harvest the amount of forage fish at such high levels. The three-tiered approach involves understanding the 1) dynamics of the fishery, 2)  knowledge of the status of the trends of the fishery’s predators, as well as 3) recommended management actions.

“Traditionally we have been managing fisheries for forage species in a manner that cannot sustain the food webs, or some of the industries, they support. As three-fourths of marine ecosystems in our study have predators highly dependent on forage fish, it is economically and biologically imperative that we develop smarter management for these small but significant species,” stated Dr. Ellen K. Pikitch of the Institute for Ocean Conservation Science at Stony Brook University (they led the Lenfest Forage Fish Task Force).

Most recently, managers in the Mid-Atlantic have noticed the increasing importance of forage fish and voted to reduce the annual harvest of menhaden from 183,000 metric tons to 174,000. Read more here on the report and what other measures are being done to keep menhaden levels more sustainable.

It will be interesting to see how this report impacts forage fisheries in the future. I certainly hope it does.

Check out this video from the Task Force to learn more on the importance of forage fish.

Lastly, here is a quick overview of what it means to be a sustainable fishery:

  • If we are referring to a sustainable wild fishery (one that is not farmed) it could be the measure of the abundance and resilience to fishing pressure, how well-managed the fishery is based on current research, and/or that the fishery is harvested in ways that do not harm the environment or have negative interactions with protected species as bycatch.
  • With farmed species a sustainable it is typically a measure of minimizing marine resources, preventing escapes or diseases to wild stocks, as well as ensuring that the fishery is not associated with high pollution or other ways of negatively harming the habitat.
  • For a good resource to discover what fishery is sustainable in your region,  please check out the Monterey Bay Seafood Watch.
Filed Under: Biodiversity, Birds, Bony Fishes, Fish Tagged With: , , , , , , , , , , ,

100 ways to live (and die) green

April 15, 2012 by 3 Comments

Conservation and marine science education are two primary themes on BCS. And, since I’ve been dedicating a lot of time to marine science education the past few months I indulged myself with this list 100 of ways to live (and die) green. It’s a list of fun suggestions – beyond recycling day-to-day – and is appropriate since this weekend is Earth Day and this week is National Environmental Education Week! Please don’t hesitate to email info@beachchairscientist.com with any questions or comments. Feel free to comment and add to the list. I love new ideas.

  1. Install a dual-flush conversion kit.
  2. Use  water bottle (they even come with filters!).
  3. Make sure your faucets do not leak.
  4. Plug the sink to collect water for rinsing dishes.
  5. If you do have a leak, why not make it count and use the water wisely for something else.
  6. Pre-rinse your dishes for the dishwasher with a squeegee instead of rinsing in the sink.
  7. Why not install a low-flow showerhead?
  8. Filter your water from the tap.
  9. Turn off the water when you brush. (It will save about 8 gallons of water a day!)
  10. Take shorter showers.
  11. Only do full loads of laundry.
  12. Do not dump hazardous materials (e.g., oil, grease, antifreeze, pesticides, fertilizers, paints).
  13. When it’s dirty, take the car to a professional car washer. (Doing it yourself in the driveway wastes about 150 gallons of water.)
  14. Use pet-safe deicers when it snows.
  15. When your feisty pet chews the squeaker from his toy, why not put it back in and sow it up for another round of tug-o-war?
  16. Consider natural pet products for your furry little buddy.
  17. Give the wire hangers back to the dry cleaner.
  18. If you dry clean do it less often so they can bulk up more and skip on more plastic wrap.
  19. Xeriscape (i.e., plant natives to reduce the need to water).
  20. Use a rain barrel in the garden.
  21. Consider using alternatives to pressure-treated wood in your garden.
  22. Use some elbow grease to pull weeds or use a natural herbicide to get rid of weeds.
  23. Use a library. (Here I could also suggest switch to an ebook reader, but since my mom is a librarian and I know she loves her job I’ll promote a little community citizen interaction.)
  24. Buy local produce for your dinner.
  25. Switch to fairtrade coffee or tea for the morning beverage.
  26. Use a reusable bag when shopping. (You might remember the ‘Majestic Plastic Bag‘ series from last year.)
  27. Skip the meat in the dinner for a night each week.
  28. Jazz up the garden with some illuminating beautiful solar lighting.
  29. Make sure your exfoliating facial scrub doesn’t have harmful plastic beads that do not dissolve when they go down the drain.
  30. Know what ingredients are in your beauty products.
  31. Ask your workplace to consider carbon offsetting.
  32. Go ahead and send the electronic birthday card. After all, it’s the thought that counts, right?
  33. Pack your shorty’s lunch in a reusable bag.
  34. Pack their lunch items in reusable containers, too.
  35. When you use plastic cutlery, try a biodegradable option.
  36. Choose an organic version of the fabric of our lives.
  37. Try a DEET free bug repellant.
  38. Compost!
  39. Make your own cleaning products or use some natural ones that won’t harm the local watershed.
  40. Skip the paper towel and try cellulose cloths.
  41. Make certain to maximize the way you wash dishes.
  42. Wash your clothes is cold water.
  43. Get a home energy audit.
  44. Use a non toxic paint.
  45. Install Energy Star appliances.
  46. Hang dry clothes.
  47. Wear a sweater.
  48. Generate your own energy and install a DIY solar panel kit.
  49. Generate your own energy and install a DIY wind power kit.
  50. Install ceiling fans.
  51. When you’re going to leave a room for more than 15 minutes – switch the lights off.
  52. Install efficient lighting throughout your home.
  53. Donate your electronics  properly.
  54. Pay your bills online (and, ask your boss to direct deposit that obscene paycheck you don’t really need).
  55. Ask your neighborhood association to install solar lamp post lights.
  56. Go natural with your products when you’re about to have a little one.
  57. … And, after you have a little one.
  58. Decorate with plants to increase the air quality in your home.
  59. Be a little unconventional with your online shopping.
  60. Be creative in your gift wrapping and use some newspaper or magazines!
  61. Keep your car in tip-top shape to save on gas mileage (and/or go hybrid).
  62. Try to use public transportation or carpool when possible. (Or slug, DCers!)
  63. Consider rechargeable batteries.
  64. Be conservative in what you decide to print off the computer and when you do need to print do it double-sided.
  65. Find the people to call to cancel your phone book delivery.
  66. Skip the ATM receipt.
  67. Turn off the computer monitor at night.
  68. If you’re looking to buy a new computer, purchase a laptop instead of a desktop.
  69. Use recycled paper for your creative needs.
  70. Check out your neighborhood to see if there are proper bike or walk lanes and bike or walk when possible. (Check it out – May is National Bike Month!)
  71. Stop junk mail! (Did you know that the average adult receives 41 pounds of junk mail each year?)
  72. Choose a green hotel when traveling (or, my favorite – VHBO).
  73. Buy bulk. (It’s nuts – packaging makes up more than 30% of our waste!)
  74. Rock a green hosting company for your next website.
  75. Rent, borrow, or Freecycle!
  76. Save the take out container and use it as tupperware or to hand out cupcakes at your shorty’s birthday party.
  77. Bring your own mug to the local coffee shop so you don’t have to use one of theirs.
  78. Telecommute.
  79. Skip the CD or DVD purchase and download online.
  80. Stray away from imposing balloon releases unless you know they’re latex.
  81. Stray from using 6-pack rings (or cut them).
  82. From time to time use one less napkin.
  83. When fishing always be an ethical angler.
  84. Eat sustainable seafood.
  85. Skip the produce in additional plastic wrap.
  86. Participate in local clean-ups.
  87. Rock a new TV as they’re a little more efficient.
  88. Keep the freezer at least 3/4 full.
  89. Once a month bake a loaf of your own bread.
  90. Once a month why not roast your own chicken and stock up some homemade chicken broth afterward.
  91. In winter, keep the shades drawn when you’re away.
  92. When purchasing furniture find products that are earth-friendly and organic (e.g., cotton, wool, hemp, natural rubber latex).
  93. Plant a tree.
  94. Rock some vintage jewelry.
  95. Clothe diaper.
  96. Make your own play-dough with the kids.
  97. Blow your nose green. (Ewwwww … what did she say?)
  98. Recycle toner.
  99. Stay informed and educated.
  100. Be buried green.
Filed Under: Conservation, People, Random Fun! Tagged With: , , ,

Wordless Wednesday | Shell art

April 4, 2012 by 1 Comment

For more images from Beach Chair Scientist, please visit Flickr.

Filed Under: Seashells

Spend your tax refund at United by Blue!

April 3, 2012 by Leave a Comment

United by Blue is an organization that is dedicated to making and seeing a difference in our world, with particular attention on the oceans.  Brian Linton started the company in May of 2010 and sells amazing apparel, jewelry, and bags and makes certain to remove 1 pound of trash from the world’s oceans and waterways for every product sold. So far they’ve removed over 83,380 pounds of trash from our seas. As they state on their Blue Movement page they’re, “Dedicated to preserving and protecting our world’s oceans and waterways for our own and for future generations.  We are scuba divers, fisherman, and sailors. We are educators, activists, and businesspeople. Most importantly, we are all passionate, and we all understand our dependence on the world’s oceans and waterways“.

Review the website for products and more background on topics and issues such as shark finning, sustainable fishing, and coral reefs. Check out the Lookbook for the very chic, fun, and stylish products featured this spring/summer. (You can even purchase gift cards for friends and family!)

One more thing, one of their interns, Lauren, created an attractive infographic about where our plastic bottles go after we either toss or recycle. She points out that even if a plastic bottle is recycled the tosser isn’t that altruistic as we may have once thought (water bottles are always an option). Enjoy, share, and please feel free to comment (Oh, and shop!).

Filed Under: Ocean, People, Random Fun! Tagged With:

The Bluefish by Isaac McLellan

April 2, 2012 by Leave a Comment
Bluefish

Bluefish (Photo credit: Wikipedia)

I hope you enjoy this poem about a very popular Atlantic coast recreational species, the bluefish. I have some fond childhood memories aboard my grandparents boat, Irish Eyes, learning many life lessons while seeking out bluefish.

Issac McLellan (1806 – 1899) was a New England author and poet. Coincidentally, he was born in Portland, Maine which is where we’re headed today! Enjoy.

The Bluefish by Isaac McLellan

(Pomatomus Saltatrix.)

It is a brave, a royal sport,
Trolling for bluefish o’er the seas;
Fair skies and soaring gulls above,
A steady blowing breeze;
A shapely yacht whose foaming prow
The billowy plain divides,
That like a gallant courser speeds
Far, free o’er ocean tides.

First from West India seas they came,
Haunting the Cuban coast,
Cruel as Spanish buccaneers,
A fierce, rapacious host.
But now by Northern seaboard shores
Their murderous way they take,
From Mexico Gulf to Labrador,
Wherever billows break.
The weaker tenants of the main
Flee from their rage in vain,
The vast menhaden multitudes
They massacre o’er the flood;
With lashing tail, with snapping teeth
They stain the tides with blood.

Rakish are they, like pirate craft,
All matchless to assail,
With graceful, shapely, rounded sides
And the sharp, forked tail;
And when the angler’s hook is fixed
They fight, they struggling bleed,
Now leaping high, now plunging deep,
Darting with lightning speed.

And yet these sea marauders,
These tyrants of the main,
By fiercer, mightier ruffians
Are hunted, conquered, slain;
The tumbling porpoise hunts them,
Dorado fierce pursues,
And when the shark assaileth,
Blood-stains the waves suffuse.

Filed Under: Bony Fishes, Fish, Random Fun! Tagged With: ,

Can you name the state fish of Hawai’i?

April 1, 2012 by 2 Comments

It’s “Humuhumunukunukuāpua’a” in case you missed it when the bartender mentioned it in Forgetting Sarah Marshall. As a bonus, I’ll also give you a rundown of all the other states with a state saltwater/game fish. Some you may already know, but  some might surprise you! I never would have thought that so many states have striped bass designated as a state fish or state saltwater fish. After all, there are over14,000 species of saltwater fish out there.

(If I missed one please feel free to let me know and I’ll add it to the list. All you have to do is leave a comment of email info@beachchairscientist.com.)

Alabama:
Fighting tarpon (Megalops atlanticus) – These fish can absorb oxygen and live in waters with almost no oxygen.

Alaska:
King salmon  (Oncorhynchus tshawytscha) – These fish regularly exceed 45 lbs and the largest on record was a 126 lb caught in 1949.


California:
Garibaldi (Hypsypops rubicundus) – These fish are very territorial and call kelp forests home of choice.


Connecticut:
American shad (Alosa sapidissima) – These fish only have one dorsal fin and one anal fin.


Delaware:
Weakfish (Cynoscion regalis) – These fish are not weak at all but quite strong fighters. The name refers to the easily torn part membrane in its mouth.  A fond memory of my childhood involves my grandfather always giving my folks some weakfish he caught on his boat, Irish Eyes.


Florida:
Atlantic sailfish  (Istiophorus albicans) – These fish are the fastest fish in the sea and have been observed at speeds above 65 miles per hour.

Hawai’i:
Humuhumunukunukuāpua’a (Rhinecanthus rectangulus) – This fish has blue teeth.

Maryland:
Striped bass (Morone saxatilis) – These fish are also commonly known as rockfish.

Massachusetts:
Cod (Gadus morhua) – These fish will change colors depending on where it spends its days. If it prefers the sea floor it will appear gray and if it prefers algal areas it will appear greenish.

North Carolina:
Red drum (Sciaenops ocellatus) – These fish got their name from their coloring and from the drumming sound produced by their  their swim bladder.

New Hampshire:
Striped bass (Morone saxatilis) – These fish prefer coastlines and are most active in the spring and fall. Sport fishermen love to catch them during the striper runs.

New York:
Striped bass (Morone saxatilis) – These fish are the most popular sportfish on the Atlantic coast. 

Rhode Island:
Striped bass (Morone saxatilis) – These fish prefer to eat before dawn and at dusk. 

South Carolina:
Striped bass (Morone saxatilis) – These fish do not have eyelids so when the sun is out they prefer to retreat to deeper waters.

Filed Under: Biodiversity, Bony Fishes, Fish, Places, Random Fun! Tagged With: , , , , , , , , ,

April is National Frog Month

April 1, 2012 by 2 Comments

Yes, that is correct – April is National Frog Month. However, this is not a post about the amphibian, but is all about the frogfish! Contrary to popular belief, it’s easy being green if you’re a frogfish. First of all, you can change colors from green to black, or red, or orange, or yellow, or brown, or white, or purple, or even blue! These colors help the frogfish mimic corals, sponges, algaes, or even rocks. Often a trusting fish become prey all too easily as they go to hide in the ‘coral’ or ‘rock’ only to then get eaten by the frogfish that has transformed . Frogfish gobble up their prey in 6 milliseconds. Frogfish actually have the fastest mouth in the sea. Their mouth is able to expand 12 times its size and they can easily eat prey 25 percent longer. They’re opportunistic and eat whenever possible. They tend to feast on smaller fish, crustaceans, or even other frogfish!

Another amazing mechanism of the frogfish is an antenna that dangles from their head. They’ll mimic the actions of a smaller animal (e.g., a worm or shrimp) with this antenna so that their own prey will swim right up to them. Don’t worry though, the lure will regenerate if eaten.

Frogfish do not have a swim bladder, but do have modified pectoral fins enabling them to ‘walk’ along the seafloor. See the video below to see this in action.

Frogfish live in the tropical and subtropical areas in the Atlantic, Indian, and Pacific Oceans.

It is the original footage from these hairy frog fish walking on the sand was made by Daan van Wijk in Indonesia. These scenes are from the movie Impressionesia”.

Filed Under: Algae (Seaweeds), Animal Homes, Bony Fishes, Crustaceans, Fish Tagged With: , , , ,

‘Wicked Tuna’ is food for thought

March 31, 2012 by 2 Comments

Tomorrow the National Geographic Channel (of which approximately over 50% is owned by NewsCorp, a Murdoch Company) is debuting the television show Wicked Tuna. The show is intriguing because the species itself is remarkable.

Atlantic bluefin tuna (Thunnus thynnus) can swim up to 40 miles per hour and can dive up to 3,000 feet. Their body is so remarkably streamlined for efficiently swimming through the ocean that Pentagon-funded scientists have studied the species as a model for Navy torpedoes. They’re also known to travel far and wide (actually, across entire oceans over their lifetime). This causes some challenges when coming together to manage the species.

The dilemma I have in deciding to watch the show is that NatGeo may be glorifying the bluefin tuna as a species of consumption so that people start ordering it more. But, folks need to understand the repercussions and ask one more question, “Is this bluefin tuna caught in the U.S.?”

As I mentioned, there are some challenges with managing a species that spans globe. Bluefin tuna are an internationally managed species, guided by the intergovernmental body the International Commission on Conservation of Atlantic Tunas (ICCAT). Within management plans of the ICCAT, it is irrefutable that the U.S. bluefin fishery is the most sustainably managed in the world. The bluefin tuna caught in Maine, New Hampshire, and Massachusetts is predominantly hand gear (rod and reel or harpoon). This fishery is well regulated and responsible. There is also bluefin tuna caught as bycatch from the longline fisheries targeting other types of tuna. To reduce bycatch, fisheries are now required to use circle hook and weak hooks to reduce the bluefin tuna bycatch, as well as other nontarget species (e.g., sea turtles). The species is slow to mature and catching young bluefin tuna reduces the chance they’ll have the opportunity to reproduce. That is why it is so negligent to eat the bluefin tuna from the poorly regulated European fishery. Many of the bluefin caught there are with purse seines or longlines. In fact, since industrial fishing began in the Mediterranean it is estimated that over 80 percent of bluefin stocks have been fished out.

It’s no help that there is extreme demand for this type of fishing pressure as sushi chefs will pay gobs for the fish. The ‘Wicked Tuna” fishermen can get up to $20,000 for each fish. In January 2012, a Tokyo restaurant paid $736,000 for a bluefin tuna at auction (there’s the ‘first fish phenomenon’ which can bring a lot of publicity to a restaurant for paying a high amount for the first fish). Click on https://www.altitude-sports.com/collections/footwear-men-hiking-boots to find the best quality camping equipment for you.

The Monterey Bay Seafood Guide lists bluefin tuna as a species to avoid. The Center for Biological Diversity encourages the public to boycott any restaurants serving bluefin tuna. Greenpeace has even stated that, “The world needs to see a ban on bluefin tuna fishing until stocks recover”. National Geographic claims this show’s scope includes a “solid conservation message about what’s been going on with the bluefin”. So, if you must ask for ‘Wicked Tuna’, make sure it’s at least from the U.S. Certainly, food for thought.

Filed Under: Biodiversity, Bony Fishes, Fish, Ocean Tagged With: , , , , , ,

What is oceanography?

March 30, 2012 by 3 Comments

If you take biology, physics, meteorology, chemistry, geology, geography and mix them all together (via the same concept as Ekman transport) you come up with oceanography. See this very concise infographic from the Sea Blog for a visual depiction of how it all comes together. Click here to understand the difference between a marine biologist and an oceanographer.

Filed Under: Ocean, People, Places, Test Your Knowledge Tagged With: , , , , , , , , ,