Showing posts with label BRUV. Show all posts
Showing posts with label BRUV. 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, March 11, 2018

Recovery of Sharks within a well enforced MPA - Paper!


Very nice - watch!



Paper here, synopsis here.
I must say that contrary to other papers looking at different aspects of those reefs off Western Australia where I am weary of some of the conclusions, I am quite impressed by this one as the evidence for the rapid recovery of those Sharks appears to be rock solid as e.g. evidenced by the video below.



This is good news indeed.
Provided that there is strict enforcement, MPAs appear to be an effective tool in the protection of at least those comparatively less migratory coastal Sharks - and if so, there is certainly reason for hope.

Of course for us this is nothing new.
But good to see our data (and here!) confirmed by research from other parts of the word.

Enjoy the paper!

Saturday, October 28, 2017

GWS vs BRUV - Video!


Watch.
That sure is a lot of effort for a tiny canister of Sardines!
Story here - enjoy!



Monday, June 06, 2016

Fin Focus Research!


Behold - and here!

This is really good stuff.
The Ningaloo/Exmouth area is obviously the epicenter of Australia's Whale Shark tourism and research, but the other Shark populations of that area are much more poorly documented. With that in mind, this project will help filling the data gap between Mike's stellar Shark research in Shark Bay further up North and the government's GWS research (and you must read this!) further in the South.

Obviously this is still in its infancy.
But knowing Rebecca, I am very optimistic indeed - especially if she gets the required support by both donors and the local community.
So please, do consider lending a helping hand!

To be continued no doubt!

Wednesday, July 15, 2015

Global Fin Print - epic!


Great stuff!

Read this and this announcement.
I've heard whispers about a meeting of seriously wealthy people wanting to contribute serious money to Shark conservation - and although this is pure speculation, this may well be strike one! Be it as it may, the lead team is just simply awesome and above all, it is finally (!) showing the kind of productive cooperation I've been publicly advocating for so long.
So congrats, and godspeed!

And have you noticed the videos?
Compare to this, showcasing the work by Projects Abroad's science supremos El Diego and Gauthier under the leadership of Demian and Mark - remember?



Great to see it embedded in such a prestigious project!
Just goes to show that once you stop the blathering and start the doing, good things will follow!

To be continued no doubt!

Thursday, September 11, 2014

It's not only Overfishing - one more Paper!

A baited remote underwater video station showing details of the removable bait arm, plastic camera housing and pegs for placement of ballast on the frame (a). Images of Carcharhinus amblyrhynchos (b), C. albimarginatus (c) and Galeocerdo cuvier (d) in the BRUVS field of view.

Remember this post? :)

For Sharks, the principal threat is overfishing.
But of course it only stands to reason that no Shark can survive if we destroy its habitat. We often talk about how healthy Shark populations preserve habitat, e.g. via those trophic cascades - but of course the principal effect is not top down but bottom up, which is actually so trivial that most researchers and conservationists don't even bother to mention it. Methinks that both effects are linked via feedback loops, meaning that negative effects at either side of the equation can quickly lead to a self-reinforcing downward spiral, but of course I'm speculating.

Long story short?
Species protection alone does not work - you need to also protect critical habitats.
That's why we protect the whole of Shark Reef and not only the Sharks, and that's why we continue to investigate the nurseries in the rivers!

The above is obviously particularly evident in those Reefies.
Several species like the Whitetip, Blacktip and Grey Reef Shark are highly associated with and resident in coral reefs, meaning that their dependency on the health of those reefs is likely very high. Other more transient species with a wider range of habitats like the Tigers, Bulls and Great Hammers, likely less so.

This appears to be one of the findings of this paper.
It really is fantastic stuff, the result of ten years of data collection via BRUVS, much like what the volunteers of Projects Abroad are currently doing in Beqa Lagoon. The paper is thankfully open access, meaning that there's no need for citations.
Plus, you can find a great synopsis here - inclusive of highly complimentary comments by other researchers which is really nice to see.

Well done - very impressive indeed!

Monday, August 11, 2014

BRUVS' in Beqa Lagoon - cool!

Baby Silvertips are the cutest Sharks, ever - iconic pic by Mark!

El Diego has posted another one!

After the teenage Tiger on steroids, now this.
Last week did yield one big Tiger overhead, one small nosy one, one whopping Lemon, a beautiful Zebra and the cutest tiny Silvertip, ever! All of course part of Projects Abroad's stellar Fiji Shark program.

Enjoy!



Friday, July 04, 2014

Feisty Tiger in Fiji!

Equally feisty: Andi, still tiny, 10 years ago - now she's 3m+!

Epic!

This is from three days ago.
El Diego decided to do someting different and instead of performing one of Project Abroad's usual standardized BRUV drops, he tied a whole Tuna carcass to a cinder block.
Talk about a teenage Tiger on steroids!

Enjoy!



Tuesday, April 02, 2013

Love not Loss - great Videos from SA!

Source.

Very nice!
Lauren is of course absolutely correct - please re-read this and this!
And this - very interesting!

Enjoy!



And in keeping with that spirit.
Here's a nice video about her project!



Thursday, October 04, 2012

Really cool BRUVS Footage!

 Typical BRUVS - Source

I've just received the newest SOSF newsletter .
Among many other things, it informs me that
This year, Save Our Seas Foundation received over 200 grant applications, requesting a total of over US$ 5.5 Million in grant aid for the 2013-2014 funding year. 53 of these applications were invited to submit Stage 2 applications. These figures do not take into account projects that are already receiving funds from the Foundation; some of these Principal Investigators will be invited to apply for continued funding next year.
Pretty darn impressive!
One of those endeavors is an innovative pilot project that aims at exploring the viability of using  Baited Remote Underwater Video Stations, or BRUVS to document the underwater fauna of False Bay, South Africa. As the project synopsis explains, BRUVS may be a cost effective, non extractive way for census and long-term monitoring of MPAs. Should you be interested, you can always check on the project's progress here
As always, there are challenges, as documented in this great little video about a thieving octopus.


As far as I know, BRUVS were first developed by AIMS.
Be it as it may, here's a very cool compilation of what appears to be some of their "best of", including a rather devastating intervention by a Tiger Shark that aptly demonstrates the effectiveness of its very special dentition which appears specially geared towards sawing through solid objects, foremost of which Turtle carapaces - remember those basic can openers?

Anyway: enjoy!


More info about AIMS's BRUVS research here.