A Familiar Surprise!

Thursday, May 10th

by Laurel Zaima, RJD intern

It’s time to celebrate! Exams are finally over, and summer has officially started! What better way to kickoff summer 2012 than going on an exhilarating and action-packed shark tagging trip. After an early morning, 2 hour drive down to Islamorada, all of the RJD interns took a second to stretch and got right to work. Captain Curt notified us that we will be adding 100 foot extensions onto the already existing 100 foot long drumlines (the fishing gear that we use to catch the sharks), which means we will be going to the deep water reef (125-145 foot depth). I was extremely excited because last time we went to this fishing spot we were extremely successful!

After we brought all of the gear on the boat, all we had to do was wait for the rest of our group. We were taking out some gentlemen that were members of the bonefish and tarpon trust fishermen and conservationist group, and Joe Romeiro, a filmmaker. Susan Gerrish, the RSMAS Assistant Director of Advancement, and Rose Mann, the RSMAS Assistant Dean of Advancement, also joined us on this excursion. The water was calm and the skies were clear; the only thing that could have made this trip any better was if my mom and brother would have been able to join us. They both drove down to Miami from Michigan to help me move all my stuff back home for the summer, and they had hoped that they would be able to shark tag with me before we made our long trek back. Unfortunately, family members are not allowed on most trips because other groups are scheduled for that trip already scheduled to take out another group.

Little did I know, everyone was playing a trick on me. As we organized the gear, I turned around only to see my mom and brother start boarding the boat. I was completely shocked! Susan Gerrish and Dr. Neil Hammerschlag had secretly talked to my family and planned for them to come on the boat without telling me. I was overjoyed and extremely pumped because I could finally show my family the work and research that I do for the RJD program. It was going to be a perfect day!

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Some say nothing is perfect. I beg to differ

Saturday, May 5th by Virginia Ansaladi, RJD lab manager

It’s that time in the semester again when you can’t even remember what the ocean looks like – or the sun for that matter. 5-Hour Energys are your best friend and all nighters are like that guy from high school who just realized you’re the only one he knows in the chemical oceanography class he’s having trouble with – you can’t avoid them no matter what you do. Needless to say, I was PUMPED about spending a day on the water to get away from it all. Little did I know what a truly amazing day it was going to be.

We RJD folk like to carpool to relieve that monotonous 2 hour drive down to Islamorada where we go fishing, so I was up by 5am collecting my things before heading out to pick up my fellow RJD buddies. Turns out it had been a long week for everyone so I had a couple bobbing heads on the way down that highlighted my own tiredness. Luckily, fellow intern, James Komisarjevsky, is a grade A copilot and supplied me with energizing fruity V8 deliciousness, because as soon as w got there it was go go go. We loaded the boat, collected forms from our participants, and we were off – with quite an eclectic group might I add.

We had members from Shark Whisperers charity, Shark Savers advocacy group, and shark lovers from the community at large out with us today. A really great group to have aboard – lots of questions, lots of interesting conversation, but most of all, lots of enthusiasm.

The conditions were perfect out for sampling one of our deeper sites (a chance we don’t get often), so we attached some extension lines to our drumlines and dropped our first ten 150 feet down into the blue. And what do you know? Not only was the weather cooperating, but so were the fish.

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When life gives you lemons…

Friday, March 2nd

Today was a wonderfully lemon-y day on the water for the RJD team and our friends from Miami Dade College. Captain Curt took us out in the beautiful R/V Endsley to a site in Everglades National Park called the middle grounds. We have often had great luck at this site before, catching blacktips, bull sharks and lemon sharks, but today we were in for a special treat: four female lemon sharks, the smallest of which was 242 centimeters—or just under eight feet! The largest was 8.3 feet, and estimated by the RJD team to tip the scales at around 350 lbs.

The use of cables help RJD staff and interns bring large sharks (like this lemon shark) on board safely, preventing too much pressure from being placed on the hook in the shark’s mouth.

Though we might joke that lemon sharks take their names from their zesty flavor (not true) or sour disposition (not true), the real reason is probably that they are yellowish in color. The intensity of their color varies based on the habitat they are in—lighter and brighter in sand, darker and browner in mud or seagrass. Because of the muddy bottom in the area where we were fishing, none of our lemon sharks were very brightly colored.  Luckily, there is another easy way to identify them: although most sharks have both a dorsal and a second dorsal fin along their back, in lemon sharks the second dorsal is nearly as large as the first.

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A new RJD record: 11 nurse sharks in one day!

Sunday, February 26th

From the looks of the weather, the mast academy and the RJD interns didn’t think we were going to have a shark filled day. There were scattered clouds, choppy waters  and the group was set out to go to the edge of Hawks Channels where the waters were a bit calmer.  Captain Curt, James, David, Julia, Virginia, LeAnn, Fiona,  Laurel and set out the first drumlines. The spirits were high and everybody had one thing on their mind, sharks.

A couple drumlines were reeled in and the first nurse shark was on the line. The students and interns were able to gather data for the program by taking measurements, a fin clip, and insert a spaghetti tag. We kept rolling in the drumlines and the sharks just kept coming.

Captain Curt pulls in a beautiful nurse shark so the team and the mast academy students can gather some data.

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The pros and cons of shark ecotourism

By Stephanie Crawford, Marine Conservation Biology student

Ecotourism is one of the fastest growing sectors in the tourism industry. It encourages locals to utilize natural resources in a sustainable manner and can promote conservation.  Ecotourism enables people to interact with marine life for money, which is economically important for countries. One strategy for reducing the harvest of vulnerable populations is to use ecotourism to generate revenue from live sharks to help deter population declines. Shark diving can be found in 29 countries, with new destination and target species being established due to the recognition of the economic potential.

Shark ecotourism is popular and controversial – there has been debate based on the risks to human safety, such as associating food with humans, and perceptions of behavioral shifts. Shark diving has local economic benefits and encourages conservation by creating public awareness, but it is argued that ecotourism also has the potential to affect species by altering their natural behavior. Studies have shown that shark diving can have behavioral and ecological impacts on sharks. It is important to assess the impacts of shark ecotourism has on their natural behavior and to determine if it is detrimental to their health.

There have been studies done on the feeding behaviors, depth differences, abundance and habitat use on various species of sharks to see if shark diving has negative impacts on the health and ecology of sharks. There is still limited information on how provisioning sharks in general affects the natural behavior and health of individual sharks. The strong economic incentive to maintain, or even promote, shark related tourism may outweigh the perceived negative effects of provisioning on sharks, especially since there is a lack of strong evidence showing such effects. Studies have shown that it has not been possible yet to determine whether tourism significantly affects sharks health or long-term behavior and further research needs to be done.


ResearchBlogging.org

Orams, M. (2002). Feeding wildlife as a tourism attraction: a review of issues and impacts Tourism Management, 23 (3), 281-293 DOI: 10.1016/S0261-5177(01)00080-2

Maljković, A., & Côté, I. (2011). Effects of tourism-related provisioning on the trophic signatures and movement patterns of an apex predator, the Caribbean reef shark Biological Conservation, 144 (2), 859-865 DOI: 10.1016/j.biocon.2010.11.019

Fitzpatrick, R., Abrantes, K., Seymour, J., & Barnett, A. (2011). Variation in depth of whitetip reef sharks: does provisioning ecotourism change their behaviour? Coral Reefs, 30 (3), 569-577 DOI: 10.1007/s00338-011-0769-8

Breaking in the new boat!

2/3/12

Last weekend, students from the Archimedean Academy joined the RJ Dunlap team for the first of many voyages on Captain Curt’s new boat! This new vessel, named after Captain Curt’s soon-to-be-born daughter, is a welcome addition to RJD. It’s size, range, and cabin space will allow our team to do even more research in the Bahamas and other far-away sites.

Students from the Archimedean Academy pose on Captain Curt’s new boat!

 

We went to Middle Grounds, a site in the Everglades National Park known for having lots of sharks. Nutrient-rich runoff from the Everglades creates a rich feeding ground for many species of sharks. Some of our highest catch-per-unit-effort (a measure of shark abundance) has been at this site. Our catch didn’t disappoint- in total, we caught, tagged, and released two blacktip sharks, an Atlantic Sharpnose shark, and a blacknose shark.

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Starting the semester off strong

1/29/12

Our first weekend of trips for the semester ended with a beautiful day off the coast of Key Largo with RSMAS PhD student Rachel Silverstein and her friends and family. The day started with overcast skies but that didn’t stop the group from showing their excitement for the day of shark tagging that lay ahead. After explaining some to the group why we study sharks and some of the different aspects of RJD research, we headed offshore to set our first ten drumlines. The first set turned up two very large and feisty nurse sharks! The team and visitors got to work taking a tissue sample from the fin, measuring the animal’s length, and fitting each animal with dart tags.

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Not a Very Sharky Day

1/28/12

The University of Miami’s research team traveled to Key Largo to jump on Captain Slate’s boat for a hopeful day of shark tagging. A group of eager sophomores from MAST high school joined us on our expedition. It was a beautiful, sunny, and clear day; the water was clam, and it seemed like our odds were in our favor to catch a jubilee of sharks.

Daniela, Julia, Evan, Fiona, and I, led by our fearless leader Austin, released the first ten drumlines. After pulling in a couple lines, we got our first catch of the day! A large adult nurse shark was brought on board. The MAST high school students were delighted to conduct research, interact in the sampling process, and observe a shark so close up and personal. Everyone on the boat had high spirits and was ready to tag more sharks.

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A great start to the 2012 season!

1/27/2010

The first shark trip of the spring semester took us out onto the water near the Key Largo Dry Rocks, which are part of the Florida Keys National Marine Sanctuary. With a boat full of drumlines and eleven great students and two great adults from South Broward Marine Charter School’s Shark Club (go Reefdogs!) we headed out to sea.

The Reef Dogs and RJD team pose for a photo

On the way out we passed a wrecked barge and got to take a look at some of Florida’s beautiful seabirds, including double-crested cormorants, brown pelicans, and royal terns. Although we were lucky to have a warm and sunny day in January, it was also windy, and wind often leads to rough water: several of the students on the trip turned a little bit green over the course of the day.

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Wow. What A Way To End The Season!

Friday, December 9th 2011

For the last trip of the semester we headed out to the University of Miami’s field research station at Broad Key with members of the Board of Visitors from UM’s Rosenstiel School.  After Captain Curt, myself, Kyra, Evan and James set out the first 10 drumlines we met up with Dr. Hammerschlag, Dr. Kenny Broad, and the members of the board on the “Captain Gas” to finish our sampling.  The water was pretty rough that day, so we were happy to be on such a big, beautiful boat.

The excitement started almost immediately.  After pulling only a few lines, we had our first shark of the day: a beautiful baby tiger shark! You can easily tell a juvenile tiger shark from a full grown one by its pattern. Juveniles still show spots, while adult tiger sharks display their emblematic stripes.

Dr. Hammerschlag shows off our baby tiger shark ready for release. Click to enlarge.

Following shortly thereafter, we had a female black tip and a 6ft great hammerhead! Then, we pulled in yet another tiger shark!  This time, she was fully-grown, reaching almost 10 feet in length!  Finally, as we pulled in the very last drumline of the day, we had another incredible surprise.  This time, we had a 10ft great hammerhead shark!

By now, even those on the boat with us for the first time knew exactly what to do.  Members of the board and their family helped the interns and Dr. Hammerschlag work up the shark in record time and we released her into the water in great condition.  Two of our youngest participants of the day, Kat and Anthony, both 14 years old, had an incredible time and fearlessly helped take measurements with the help of our interns.

The team works up our first great hammerhead of the day with the help of board members and their families. Click to enlarge.

At the end of the day, Kat said that after this, she’d probably want to become a marine biologist when she grows up! This was the icing on the cake.

With five of the most beautiful sharks I’ve ever seen, this trip was a great way to wrap up the semester!  See you in the spring everyone!

Julia Wester, RJD Intern