101 Uses for Shark Puke Part 2: How Much Do Sharks Eat?

The last time I wrote about the usefulness of shark puke, I discussed a few of the less obvious uses of diet studies on sharks.  As apex predators, sharks can sample a wide variety of potential prey species, and diet studies can provide just as…

101 Uses for Shark Puke

Earlier today WhySharksMatter and I had a little light-hearted smack talk about new-school (stable isotopes) vs. old-school (gastric lavage or straight-up dissection) methods of measuring the diet of sharks.  These are the things you could be privy to if you were following me on that…

Reproduction: Secret Weapon of the Dogfish?

Spiny dogfish are one of the rare success stories in the management of shark fisheries, with the U.S. Atlantic population representing one of the few shark stocks ever to fully recover from overfishing.  At first glance this doesn’t seem to make any sense: spiny dogfish…

River Herring News

This post isn’t about sharks, but I do like to give props to those working-class fish that help feed the predators of the marine world.  Here are a couple items of interest for fans of those delicious and declining fish, the river herring. First off,…

Protected Sharks Still Eat Fish

Amid the constant talk of lowered biodiversity, invasive species, habitat destruction, global climate change, and any other examples of how thoroughly we as a species have wrecked the planet, it’s always good to hear an actual success story in conservation.  Obviously it’s never good news…

Sphyrna linkwini

It’s been a rather busy weekend/week here due to catching up on grading and attempting to get my thesis done and defended sometime before the next school year, but fear not, I haven’t forgotten you.  Because other people manage to find time to blog when…

Spring Dogfish Sightings

It’s that time of year again, when spiny dogfish theoretically head out from North Carolina waters on their way back up to New England for the summer.  However, last year there were reports of dogfish sticking around Morehead City and Cape Lookout until mid-June, and…

Sharks Join the Good Fight

As some readers may be aware, lionfish are in the process of making a massive invasion into the Atlantic, dominating reefs in the Caribbean and southern U.S., and even appearing as far north as southern New England.  JohnnyScallops has been following this story quite closely. …

Spiny Dogfish Devour Pelican!

Killer whales aren’t the only hungry predators off of North Carolina right now. A former student of mine just e-mailed me these pictures from a fishing trip off of Cape Lookout.  He was looking for stripers and saw commotion in the water ahead, which usually…

Unintentional Shark Tagging

This might possibly be the most awesome paper about tagging fish ever. One of the handiest advances in telemetry, especially of large, highly-migratory oceanic species, has been the advent of PSAT tags.  These tags do it all: movement, depth, temperature, shoe size, blood type… all…