“You could go the full route of your
shark-hunting career without ever contacting a thresher. On the other hand, you might find yourself in
an area at a time when they’re fairly numerous.
Their distribution is rather erratic and changeable. It has been our experience threshers are
seldom what could be called abundant.
“Even in one region their distribution can
be a study in contrasts. Off Montauk,
New York, for example, we’ve seen threshers breach several times as the pursued
small menhaden, and we know of five or six taken in these waters by trollers
using wire lines for striped bass. Yet
during the course of a decade we’ve seen no more than a dozen or so hung on the
docks at Montauk.”
When I moved out to Long Island a
dozen years later, little had changed.
Shark fishermen usually said that they were “going out for makos,” which were abundant back then. They landed a lot of makos between 200 and 400 pounds, with a lot more under 200 and a very, very few that went close to 1,000. The fishing held up pretty well throughout the summer.
Another, far smaller group of anglers specialized in the
big tiger sharks—fish of 500 pounds or more—that were surprisingly common
around deep structure once the water temperature rose into the 70s.
It was a completely unregulated
fishery. There were no minimum sizes, no
bag limits, and no permits needed. The
concept of “prohibited species” had not yet been born, and there were a
plethora of shark species available to fishermen. While anglers said that they were “going out
for makos” or targeting tigers, they had a good chance of catching a bunch of blue sharks, large
numbers of sandbars, dusky sharks that might weigh anywhere between 20 and
500-plus pounds, the occasional hammerhead, the even more occasional white shark and,
every now and again, a thresher.
Offshore fishing tournaments,
which either targeted sharks exclusively or included a shark category among others for tuna and billfish, were ubiqutous. From my dock in Babylon, New York, which lies
just inside Fire Island Inlet, I could have fished a tournament every weekend
from mid-June through the beginning of August, had I chosen to do so, without having to go very far from home.
While multiple shark species might be brought to the scales, when a tournament boat weighed a
thresher, it always drew the biggest crowd, for it was
often the first time that most of the folks on the dock had ever seen one.
Fifty years later, things are
very different.
The shortfin mako population has
crashed, due primarily to too many being caught and killed by the pelagic
swordfish longline fleet. In 2022, the
United States, along with all of the other signatories to the International
Convention for the Conservation of Atlantic Tunas (which applies not only to
tuna, but to “tuna-like species,” which in the inscrutable language of
diplomats includes things like swordfish, marlin and, of course, sharks)
imposed a complete landings ban on shortfin makos In 2022, theUnited States, along with all of the other signatories to the InternationalConvention for the Conservation of Atlantic Tunas (which applies not only totuna, but to “tuna-like species,” which in the inscrutable language ofdiplomats includes things like swordfish, marlin and, of course, sharks)imposed a complete landings ban on shortfin makos which, because they were
valued both for their fight and as food, were the most popular shark caught by
recreational fishermen. With the closure
in place, scientists believe that the mako population has a better than even
chance to rebuild in about 45 years.
Longliners also crashed the dusky
shark population, which is in even worse shape than the makos, and probably
won’t reach sustainable levels for at least another century. They, too, may not be legally landed. The same is true of sandbar and white sharks
which, although showing strong signs of recovery, are still in the rebuilding
stage.
Because of the prohibition on
mako landings, many shark tournaments, as well as the fishing clubs that
depended on them for much of their annual revenue, have shut down, while tackle
shop owners and folks manning local gas docks tell me that, for the same
reason, far fewer fishermen have been targeting sharks over the past few
seasons.
Yet some tournaments, and some
recreational shark fishermen, remain.
And their new favorite target,
which is both legal to harvest and good to eat, is the common thresher.
That might not have been an issue
if local ports still saw very few threshers each year. But at the same time that other sharks were
no longer available to anglers, catches of threshers began to spike. Where, in the past, I might go a decade or
more without having a thresher swim into my chum slick, in recent years, I’ve
hooked as many as three in a single day.
That might sound like a good
thing, and a sign of increasing abundance, but that’s not necessarily so. The increase in encounters could be a sign of
a growing population, but it could just as easily mean that the fish haven’t
grown more abundant, but are merely more catchable, and there’s reason to
believe that the latter is true.
With their small mouth and a
whiplike tail that can be nearly as long as their body, thresher sharks have
evolved to feed on densely schooling fish.
And in the past half-decade or so, the inshore waters off southern New
England and the upper mid-Atlantic have seen a sharp increase in both menhaden
and chub mackerel, exactly the sort of fish that threshers evolved to feed on.
As a result, anglers have found thresher sharks right on their doorsteps. Plenty of fishermen livelining menhaden just outside Long Island inlets, trying to tempt a striped bass, have gotten the shock of their lives after a 200 pound thresher, rather than a 20 pound striper, made off with their bait.
Savvy shark fishermen have taken advantage of
the situation, drifting along in the same menhaden schools as the anglers
seeking striped bass, but with tackle designed to battle a big thresher. I know of such anglers catching threshers
weighing more than 400 pounds, while fishing in less than 40 feet of water.
And most of the thresher sharks
caught by recreational fishermen are killed. The
Final Atlantic Stark Fishery Reveiw, released last year, notes that
“Common thresher sharks are unique among
sharks in the recreational fishery in that they may be the only commonly caught
species that is more likely to be harvested than released, with harvested
thresher sharks accounting for 60 percent of the total catch. Harvest estimates from 2014 to 2016 were
approximately double or more relative to estimated releases. The number of thresher sharks released increased
significantly between 2017 and 2019 while the number harvested increased
slightly after 2016…The bulk of the length distribution ranges from 55-96
inches [fork length] with a median size of 74 inches [fork length]”
The Final Review also notes that
“Prior to the implementation of new
management measures in 2018 [that initially substantially restricted, and in
2022 completely prohibited, landing shortfin makos], shortfin mako sharks made
up the majority of harvested pelagic sharks.
After that, there was a distinct shift to the common thresher shark,
however annual harvest of common thresher shark increased only slightly…The
pelagic shark fishery is largely driven by tournament fishing during the early
summer months.”
If the thresher stock remains healthy, such catches pose no threat, but they could clearly be a big problem if the stock is in decline. And the biggest problem of all is that no one knows whether the stock is healthy, because it has never been assessed.
So at the May Advisory Panel
meeting, I brought up the issue of thresher sharks, suggesting the need for
both a stock assessment and, very probably, more restrictive regulations in the
face of their growing importance in the recreational fishery. In particular, I noted that the current
54-inch (fork length) minimum size probably isn’t appropriate for a
species that doesn't see 50% of females mature until they are at least 216 centimeters—about 85 inches,
or a little over 7 feet—in length.
That’s nearly a foot larger than
the average thresher landed by recreational fishermen today.
My suggestion that NMFS consider
additional restrictions on thresher harvest, including a substantial increase in the size
limit, received
favorable comments from others in the room, and no one seemed to oppose it.
After all, in the end it makes
sense.
I love shortfin makos for their
beauty, their speed, and their magnificent jumps. But I have always been a big thresher shark fan,
admiring both their strength and their refusal to quit. I’ve had threshers that died on the line
rather than give up the fight.
Such fish deserve our respect.
We have already lost much of the
mako fishery, although catch-and-release angling is still going on. Right now, the thresher fishery still seems to
be doing OK. Which makes now the right time to lend
it a hand, before it goes the same way as the mako.