Showing posts with label Shark Research. Show all posts
Showing posts with label Shark Research. Show all posts

Thursday, July 30, 2020

Fiji's Sharks in Peril - Paper!

Remember? It is still happening!

Well well - watch.


And this is the paper.
Shame that it's hidden behind a paywall, the more as it is being hailed as a major achievement which it quite possibly is - but I will leave that determination to others.

What however irritates me is the characterization of Fiji.
The press release has quite obviously been re-worded as the initial version stated that Fiji's Sharks are functionally extinct which is a load of horse manure -  but even after the redaction, we are still being flagged as being particularly problematic which is just not true.
Here's the corresponding graph - click for detail.


Seriously, WTF?
Fiji down at the bottom - and then e.g. Tonga of all places near the top? Lemme tell 'ya that having extensively dived, and lived in both countries, this is just wrong wrong wrong in so many ways - which obviously begs the question, may other data sets be equally faulty?

So what exactly happened?
Having consulted the relevant map for Fiji, I learn that having dropped 382 BRUVs on 14 sites, they only recorded 5 Shark and 7 Ray species, and this only on 28.7% of the videos which is perplexing to say the least. But having asked, it turns out that instead of tapping the available local capacity and know how, they decided to parachute in some dude from New Zealand who I hear may have only sampled the sites of a particular NGO and not a representative cross-section of Fiji's reef ecosystems - and if so I can certainly leave it at that. *

Now compare that fiasco to the data of the GFSC.
Or to the fact that in our little region alone, we harbor at least 10 frequently encountered Sharks = GHH and Zebra, plus our usual Bull, Tiger, Sicklefin Lemon, Tawny, Silvertip, plus Grey, Whitetip and Blacktip Reefies, with several other diving operators and also research papers reporting the same and even more, equally ubiquitous reef-associated species like Scalloped Hammers or Blacktips from many other locations.
And then there's the simply massive data set from the hundreds of  BRUV drops by Projects Abroad that had incidentally been initiated in collaboration with the very same Demian Chapman who is one of the paper's leading authors - surely one should have added those sightings, too?

And the data from Tonga?
They are from a grand total of 24 drops on two sites... see what I mean?

Anyway - it is what it is.
Whereas the situation here is most certainly not remotely as bad as depicted, there is equally clearly room for improvement, see e.g.this old assessment, Kerstin's papers here and especially here, and also the description of Fiji's Elasmobranch fishery here at page 188 ff.
In brief and despite of the reduction in the Asian demand for their fins, our Reef Sharks and the juvenile Sharks in the riverine nurseries are now increasingly being targeted as an alternative source of protein as many of the traditional food Fish stocks are being depleted.
And to top it off, we're now witnessing a massive Covid-19- induced increase of indiscriminate fishing and poaching that is  threatening years of conservation efforts and also indirectly threatening our Shark populations by obliterating their prey.
Talking of which, I really did like reading that
Without an absolute estimate of the abundance of sharks, it is difficult to know how effective the estimated levels of conservation potential might be in restoring shark populations in reef ecosystems that have been degraded by overfishing.
Although research has shown that fully recovered reef fish communities have biomasses between 1,000 kg ha−1 (ref. 27) and 1,500 kg ha−1 (ref. 12), we have no current estimate of the size of the forage base that is required by a recovered shark population, or how the bottom-up effects of prey biomass might influence the recovery potential of reef sharks.
A key question remains as to whether management strategies that only pursue shark conservation can make substantial or limited gains, relative to those that include the restoration of the wider reef ecosystem.
If the restoration of the whole ecosystem is necessary to fully restore shark populations, our results underscore the need for managers to engage with the wider social, economic and cultural drivers of marine exploitation.
Could not agree more!

Long story short, the paper is certainly welcome.
Far from being defeatist, the authors suggest several pathways for improvement that I can only second, albeit with the usual general caveats (= e.g. follow the links here).
The good news is that here in Fiji, there is already some progress, namely the fin ban, the CMM for Sharks by the WCPFC  (incidentally once again courtesy of the simply unequaled Shelley) and an upcoming, WWF-sponsored, long overdue NPOA (Sharks) that will provide a framework for subsequent regulations and pacify the FAO.

And then, hopefully, we will get The Big One.
No, likely not a Shark Sanctuary but instead this comprehensive regulation - and having checked, all appears to be on track for the December deadline at the end of this year!

In any case, we stand ready.
Thanks to Tashi Blue's boundless and also, infinitely endearing passion and commitment, her My Fiji Shark project has been able to accumulate a nice little war chest that will greatly help us assist with the implementation of the regulation.
So fingers crossed and yes, very much to be continued!

But I'm digressing as always.
Enjoy the Shark paper!


* PS - Demian informs me that there was no parachute science as the vast majority of drops was effected over several years by that local NGO - which obviously begs the question, what went wrong?
Wrong habitat/site selection? Lousy bait?
Anyway, it is what it is.

Sunday, February 16, 2020

Great Fiji Shark Count - Paper!



Yeah I know I know.
39 dive operators doing 30,668 dives and making 146,304 shark observations on 592 dive sites, and then collating, triaging and analyzing those data is a lot of effort - and the concrete results are comparatively lean. BUT, it was always meant to be long term monitoring in order to detect trends and not a population census, and 5 years are really not that long - so there. 
In any case, thank you and congratulations to everybody involved, be it the participating dive ops, the tourists = citizen scientists, the donors, the project management and finally, the scientists: this has been quite impressive.

The good news?
Compared to other places, our Sharks populations appear to be faring OK - but despite of the recent fin export- and import ban, there is equally still ample room for improvement, especially when it comes to the continued fishing in the Shark nurseries.

As always we shall see.
Fiji's Shark Commitments are due by the end of this year..
Having looked, I notice that last year's mandated progress report is overdue which is not good - but methinks that as always, there will be some frantic last-minute activity to push matters over the finish line, the more as there is simply no way that Frank will accept any failures in an initiative he very much personally and publicly chaired.
So, our fingers are crossed and we continue to be hopeful - at least for now.

But back to the paper.
We have terminated the GFSC as it is just too much work and the management team was frankly getting increasingly frustrated at the lack and quality of participation and data. Also, this is merely a pre-print pending the tedious peer review process - but the raw data will not change, and this is now a great baseline from which one will be able to measure any future developments, be it progress or lack of.

So consider this an important intermediary step.
Should we get the feeling that matters have changed be it for the better or the worse, we will most certainly organize a recount and report about developments. And in the meantime, we here have already initiated new efforts to monitor some important sub-populations about which we shall be reporting shortly.

In the meantime, enjoy the paper.
To be continued no doubt.

Friday, August 30, 2019

High Seas: Sharks vs Fishing - Epic Paper!

Posted with kind permission - thank you! Click for detail!

Story here, here and here!

This is really beyond phenomenal - especially the tracks!
Just look at the GIF at the top - I mean, seriously, how bloody awesome is that!
Philopatry anybody? 

And the overlap with the fishing fleets?
Having spent countless hours looking for birds when trolling offshore, I know all too well that the prey is not distributed evenly but instead comes in patches, and that consequently, predators converge - and it only stands to reason that as we are supplanting the Sharks as the top predators on the high seas, their footprints will increasingly overlap with that of our commercial fleets, leading to high mortality rates both due to targeted Shark fishing but very much also due to (more or less) unvoluntary bycatch - see this rather recent report about the status of pelagic Elasmobranchs in the SoPac.
Earlier papers e.g. here and here - and here is also an important paper describing the grotesque irony of those fisheries being increasingly unprofitable, story here.
Anyway, huge kudos to Nuno and David - this has truly been a titatic endeavor!

Solutions?
Possibly the postulated well-placed (and well-enforced!) pelagic MPAs but that sure ain't gonna be easy (and here!) - and read this about the need to better identify, and then include those few remaining marine predator refuges! And what about the continued Climate Change-induced poleward shifts (and here!): shift accordingly?
Detail detail! :)

Yeah I know I know.
That's a lot of links - but they are simply a must as things are complicated!

Enjoy the paper and the links!
 

Wednesday, July 31, 2019

GWS and Kelp - Video!

Click for detail.

Bingo - watch.




A while back, yours truly raised concerns about what I saw as questionable research supporting the asserted effectiveness of the infamous, kelp-bio-mimicking Shark Safe Barrier.

Well, so much for that - paper here.
I'm probably just just being my usual unscientific, badmouthing and party pooping ignoramus self - but if the original premise of the whole exercise in mimicking is essentially being shown to be a load of BS, then...?
But then again, when I read about wanting to deploy 5 rows, maybe that's irrelevant as the whole thing may ultimately just act as nothing more (but also nothing less!) than an effective physical barrier that contrary to the Shark nets and drumlines would however not be killing any sea life - and if so, it would be a good thing.

Anyway.
Considering the breathy (and liability-attracting!) claims of having a 100% success rate of keeping highly motivated sharks out, this is most definitely going to be continued.

Keep watching this space!

Friday, July 26, 2019

TGIF: Cousteau - Sharks!


Behold!

This is 1968.
Epic stuff, even featuring early tagging, and behavioral experiments with the unforgotten Shark Lady, Genie Clark.
Enjoy!



Tuesday, July 02, 2019

Saving Our Sharks - Video!

Obviously don't fully agree but still, quite good - click for detail. Source.

This is great and important work.
Huge kudos to Chino and Luis, and also to all the other people, dive shops and sponsors of Saving Our Sharks who have contributed to this success.

Enjoy!




Tuesday, June 18, 2019

Essential Waters - Paper!

Intrepid and indefatigable - co-authors Kerstin and Gauthier, and Tom! Source.


All I can say is, at long last!
This has taken three interminable years of braving the weather very much including the historic TC Winston and navigating a myriad of  imponderabilia very much including plenty of the usual indigenous shenanigans and squillions of always famished namus, both of the flying and bipedal kind - not to mention the desperate advances of the infamous desperate expate housewives, let alone the even desperater expat singles!
So first and foremost, a big BRAVO, I'm mighty impressed for having stayed the course in the face of all those never-ending adversities - and I can most certainly leave it at that, the more as I trust that anybody with even the slightest knowledge of life in the SoPac will most definitely understand! :)

So there you have it.
This is the result of three years of mostly incredibly tedious fishing for juvenile Bull Sharks in the Rewa, Navua and Sigatoka. Taken in isolation, it once again confirms that Fiji's rivers harbor juvenile Bull Sharks, and that the likely parturition season coincides with when we observe that our big pregnant Bull Shark mommas leave the SRMR. 
Talking of which: so far the most likely candidates for 2019 are Shark Icon Tip and our usual Shark Superstar Brenda who will never forego the chance of some hanky panky with Whitenose - so what are you waiting for!

But that's just part of the story.
Our Bull Shark research is definitely coming full circle, and as time goes by and more data are being acquired and analyzed, you can expect more revelations about the nurseries but also likely population size, kinship, paternity and eventually, even philopatry - so keep watching this space! 

Great blog post by Kerstin here.
Enjoy!

Sunday, May 26, 2019

Haitourismus und Wissenschaft!


Für undere deutschsprachigen Freunde!

Danke Tom!
Dieses ist mal wieder saubere Arbeit: interessant, informativ, schön bebildert und vor allem wissenschaflich korrekt! 

Viel Spass beim lesen!
 

Friday, April 05, 2019

15 Years of BAD - Pictures!

Rusi the man with the yellow hood and Whitenose, the first Shark we've ever named - click for detail!


I really got nothing to add to what I said here and here.
Only, that there obviously has been more progress, foremost of which the designation of the SRMR as Fiji's first National Marine Park; quite a few more research papers, with several more already in the pipeline; and last but not least, our newest conservation initiative, My Fiji Shark.

So in lieu of yet another boring self-congratulatory tribute.
Behold 15 years of BADness - and should this or that picture intrigue you, you can click on it for detail, and also click on the dates for the relevant blog posts!
Enjoy!

The unforgotten Scarface - this pic is from 2003!

Two icons: Rusi and Scarface, 2005

October, 2006

Rusi and Doris, June10,2007
 
June 17, 2008

June 27, 2008

September 15, 2008

 

August 28, 2009
 
December 22, 2009

April 21, 2010

June 25, 2011
 
August 14, 2012

August 28, 2012

March 21, 2012

May 21, 2012

May 29, 2013 

July 26, 2013 

 August 13, 2013
 
February 14, 2014
 
April 4, 2014 

January 29, 2015
 
March 28, 2015 

September 9, 2015

February 28, 2016 


September 27, 2016

March 25, 2017

May 3, 2018 

May 15, 2018

January 1, 2019

February 2, 2019 

And finally, here we are!

To be continued - and that's a promise!

Thursday, April 04, 2019

Wednesday, March 27, 2019

Biopixel - Happy Birthday!

Source.

Behold!



Huge congratulations, and best wishes to our pals Richard, Adam, Kátya, Christian and the rest of the team - may the future bring many more exciting common projects!

Godspeed and hopefully, see you soon in Fiji!
 

Thursday, February 14, 2019

White Sharks vs Sevengills - Paper!

First image of Sevengills on this blog = as always, great pic by Peter! Source.

Just in case you've missed it.
Watch.



I must say that I really like it.
Obviously, correlation is not causation so we'll never know 100% - but as somebody who has been equally documenting long-term changes in abundance that are likely partially due to competitive exclusion, I can only applaud the authors for advancing an astute and I believe highly plausible hypothesis.

But go see for yourselves.
Paper here, synopses here and e.g. here.

Enjoy!

Sunday, February 03, 2019

Reef Shark Science - the Compendium!

One of our protected Blacktip Reefies. Great pic by Allen!

Wow.

This is just simply brilliant.
Quite the erudite tour de force, and penned by some of the very best minds in the field, it recapitulates the current scientific insights about Reef Sharks, and  charts the way for future research.

No need for synopses as it is thankfully open source.
Just this: among a plethora of valuable information, it also addresses the topic of Reef Shark - mediated trophic cascades along with those infamous postulated inverted pyramids where I also discover this equally unequivocal statement in the cited literature. 
Long story short: both are nothing but breathy myths that need to be binned once-and-for-all! And yes, it's all very much q.e.d (!!!) - and no, I'm not going to repeat myself; instead, please do re-read the part about using spurious garbage when advocating conservation right here!

But I'm obviously digressing as always.
What I really wanted to say is that this is a great paper- and big kudos to the authors!

Required reading - enjoy!

Wednesday, January 02, 2019

Elusive White Sharks - Paper!

Still one of the very best: iconic image by Terry Goss - click for detail. Source.

Great stuff!

If you're into GWS, this is a must read.
Great job by Charlie in getting feedback from the quasi-totality of GWS researchers, which sure makes for an interesting assortment of names; great questions that  obviously also pertain, mutatis mutandis, to other Shark species;  and last but not least, great bibliography for further reading!
So well done folks, and thank you!
 
Enjoy!

Sunday, December 23, 2018

Fishing for Sharks in Fiji - Paper!

Click for detail! 

How times change!

Remember Kerstin's master thesis and subsequent paper about coastal fishing in Fiji? 
Back then when she did her survey a mere five years ago, the data revealed that most caught Sharks were primarily being kept in order to sell the fins to the local bêche-de-mer traders who in turn would export them to Asia.

Not so nowadays.
Kerstin has once again interviewed dozens of fishermen all across Fiji and the news is not good. On top of discovering that indiscriminate overfishing and poaching have very unfortunately become ubiquitous, Shark fishing has fundamentally changed.
As the Asian demand, and thus the prices for the fins have crept ever lower, and as most middlemen have vanished due to the closure of the local bêche-de-mer trade, most caught Sharks are now being caught incidentally and consumed directly by the fishermen themselves. This is very much in line with international developments (and here! and here!) where as the prized Fish are being fished away, the once-eschewed Shark meat is increasingly being consumed as an alternate source of protein.
And where Sharks are still being targeted by small-scale commercial fishermen, it is for the local trade in the Fish markets where Shark meat is being sold as a cheap alternative to chicken and where you can buy a bundle of neonate Sharks for a fistful of dollars, but also in order to sell the fins directly to the local Asian restaurants.

This is obviously of concern.
Whereas trying to manage the fishery by monitoring the trade is comparatively easy, trying to monitor thousands of subsistence fishermen is not; and it is also of particular concern to us to discover that the fishermen are targeting the juveniles of Scalloped Hammerheads and especially Bull Sharks in the river nurseries, see the graph at the top.

Solutions?
Look no further than this commitment by Fiji at the 2017 UN Ocean Conference where I'm highly confident that good things will happen sooner rather than later. And when that eventuates, we will be standing ready to assist with the monitoring and enforcement like announced.
And yes: please Adopt Your Shark Now!

But I'm digressing as always.
 

Tuesday, June 26, 2018

Sharks in the Ba Estuary - Paper!

Love love love this pic - source!


Nice job by Tom et al.
From what I gather, whereas the field research has been challenging, the paper has been a rather traumatic experience - and no, no need to elaborate, the more as the good news is that this finally completes Tom's master thesis and that consequently, he can now fully concentrate on his already impressive career as a conservation photographer and filmmaker
So big congrats Tom - in every sense!

And the Ba estuary?
Our own ongoing research suggests that it may well be more than a mere aggregation and parturition site, and confirms that it is certainly a place of great interest warranting protection - but  these things are complicated and take a lot of time, and bycatch mitigation and enforcement will always be a huge challenge, meaning that at present, I'm alas not terribly hopeful for the short term.  
But hope springs eternal, and we're certainly going to stay on it.

In the meantime, enjoy Tom's paper.
To be continued no doubt!