Do you have any burning questions about fish, sharks, fishing, or fisheries? Want to ask an expert (or at least an expert-in-training)? Well, today is your lucky day! Starting at 4pm EST, myself and a bunch of other graduate students from the FSU Coastal & Marine Lab will be doing a reddit AMA and will attempt to answer all of your queries. Ask Us Anything!
Tag Archives: fishing
From Deep-Sea News:
Why is it that we now condemn the man on the left but celebrate the dudes on the right? What is fundamentally different about these two photos?
I think it is because we can readily see the impact of killing a lion but the ecological effects of removing upper level pelagic predators are practically invisible to us. What do you think?
How to sample very large fish
I spent most of the month of May traveling around Florida training fishing charter captains how to collect biological samples of goliath grouper (formerly known as jewfish). These trips were phase one of a 3-year grant that our lab was awarded to collect age structure information about the goliath grouper population in Florida. Since 1990 when a moratorium was placed on all goliath grouper landings, the population has since increased and goliath grouper are now a common sight at reefs and wrecks along the Florida coastline. Just how much the population has rebounded remains in question and information about the age-structure of the population (How many young fish are there? How many adults?) is critical to determining just how much the population has increased and what kinds of management decisions must be made to prevent another near extinction.
The typical way to age a fish is to use the otolith, or ear bone, that most fish grow inside their heads. Used for maintaining balance when the fish is alive, once removed the otolith can be used to determine how old the fish was. Otoliths grow in spurts, just like fish do, that roughly correspond to the seasons, and so the otolith grows ring by ring, much like a tree. Obviously, counting otolith rings requires killing the animal, something we would like to avoid doing to an endangered species. Instead we use the rays of the dorsal fin which also grow rings like a tree. The rays are embedded in resin, cut into thin sections, and then the rings are counted under a microscope.
In the past few years our lab has caught and sampled about 250 fish, but at least 1000 are needed to reliably estimate the population. This is where the charter captains come in. Once trained by us, they will be able to land and sample goliath grouper if they happen to catch one during a charter. We get the samples and the customers get a rare, up-close experience with a huge fish!
Check out the lab’s website for more info. And here is a video detailing the complete sampling protocol. Spoiler alert: big fish and biologists below!
How much does it cost to count fish?
So all Bob does is float around in the Florida Keys counting fish, how expensive could that be? Well, I can assure you, it ain’t cheap. Here’s a little rundown on what it costs me to do my research each summer:
- Everyday that I spend on the water costs approximately $100. This includes boat rental, gas, ice, and bait if we need to catch fish. Last summer I was down in the Keys from mid-May through June and used the boat 30 total days.
- Travel to and from the Keys, a 2600 mile round-trip from north Florida, costs about $250 each way.
- Every other day we have to refill our SCUBA tanks at $4 a pop. Last summer we filled up 95 SCUBA tanks.
- Lodging runs about $250 per week. This summer I hope to stay in the field for at least 6 weeks.
- Other miscellaneous supplies (e.g. dive gear, fishing gear, slates, jars, etc.) usually costs another $300-$400 every summer.
At the end of the day, a full field season can cost me as much as $5K! Last year I was awarded two grants to pay for my research: one from the PADI Foundation and the other from the Sigma Xi Scientific Research Society. This year I will be paying for my research trip myself, mostly from a stipend I got from a research cruise I went on last fall (you can check out pictures from that trip here) and I’ll supplement that with whatever I can raise through SciFlies. If you’d like to sponsor my research, maybe buy me some SCUBA tank fills or a day on the boat, you can do so by clicking here.
So now you know what it to do research. Even though it is expensive, and can be difficult, stressful, and even painful at times there is nothing else I’d rather be doing!
Red grouper: prairie dogs of the sea?
Currently I am involved with a very exciting new fundraising initiative called SciFlies. This group is bringing science to the people and allowing for scientific research projects to be directly funded by the general citizenry.
My project can be found here. Please take a look and consider donating.