PhD Highlight | An Amazonian Journey – Naturally Talking

We journey to Brazil, canoe by way of the Amazon, and go on a quest to seek out the cardinal tetra.

After a two-day journey we arrived in Manaus the place we met up with our collaborator Daiani Kochhann on the Nationwide Institute for Amazonian Analysis (INPA). From there, we headed to our first subject website in a protected space of the Amazon, the place we had been hosted by the Naked neighborhood, who had been extraordinarily welcoming. Right here, we met our professional information and fisherman, Lindoso, who navigated our boat by way of the igarapes (forest streams) and led us on our enterprise to seek out the cardinal tetra. On this explicit area, fish populations should not fished for the aquarium commerce. Whereas we had been hoping to make use of the fish from this space as a type of “non-fished” management inhabitants, we weren’t fully positive of what we would discover right here.

The environments we noticed had been extremely dynamic, and with water ranges quickly declining as a result of dry season, our subject websites had been beneath a continuing state of flux.

Regardless of our greatest efforts, we didn’t discover any cardinal tetra on this first space, however we did see an abundance of different decorative species, from varied tetra species, to angelfish and different cichlids, and even stingrays. Seeing aquarium fishes of their pure habitat was unimaginable and in addition allowed us to realize extra perception into the situations that they stay in, with many fishes residing in extraordinarily hypoxic (5% oxygen saturation) and low pH (4.0) water with seemingly no in poor health results. We had been additionally in a position to take many underwater movies displaying fascinating shows of fish behaviour, in addition to footage of fish getting into artisanal traps. We hope to make use of this footage to supply a number of the first recorded behaviours of decorative fish interacting with artisanal fishing gears. We additionally managed to do an thrilling challenge utilizing the noticed tetra (Copella nattereri), the place we filmed fish being trapped by a cacuri, a standard fishing entice, and introduced them again to a makeshift lab to bear behavioural and physiological trials to check fish that had been captured utilizing completely different strategies. Keep tuned to seek out out extra about this.

After a 30-hour boat journey (and a bout of meals poisoning), Shaun and I then arrived at our subsequent vacation spot alongside the Rio Negro, Barcelos, which has been the hub of the decorative fishing trade in Brazil for many years. The historic significance and legacy of the aquarium commerce was evident right here, with many murals devoted to the trade, in addition to a yearly carnival that celebrates its most iconic species, the cardinal tetra, and the blue and inexperienced discus. All through our journey, the significance of fishing, and the way in which fishing was ingrained into Amazonian tradition grew to become obvious, however we had by no means seen a dedication to the decorative commerce like we had right here. That is maybe not shocking, on condition that at its peak, the export of cardinal tetra alone supplied as much as 60% yearly earnings for native communities in and round Barcelos.

It was in Barcelos that we partnered up with Deco, an area fisher with over 30 years of expertise fishing for the decorative commerce, a transparent love of the atmosphere that he grew up in, and one of many quickest boat drivers we’ve got ever met. He navigated our boat by way of distant jungle for hours and knew the labyrinth-like streams inside and outside. After a few days of looking out we struck gold and eventually discovered cardinal tetra. We discovered them clustered collectively within the drying igarapes in each small and huge group sizes. We collected them utilizing cacuris in addition to rapiches (a specialised artisanal internet), recording the method underwater.

Whereas in Barcelos we had been additionally in a position to get additional perception into the seize of wild-caught fishes for the aquarium commerce. By means of conversations, we gained perception into which fish had been most respected, adjustments in abundance, attitudes in direction of native conservation applications, and adjustments in fishing practices over time. Just a few issues grew to become obvious. Fishing for the aquarium commerce has occurred in Barcelos for many years, with native information and methods being handed down by way of a number of generations. Sustaining the environments that tetra and different aquarium species stay in is essential to making sure the commerce can proceed and is subsequently an incentive for environments being protected. We noticed this in particular person throughout our seek for tetra, the place websites that had been not used for the aquarium commerce had been remodeled for agriculture. There was a stark distinction between these two environments.

Following our profitable hunt for the tetra, we then transported tons of of fish again to the labs in Manaus. Right here, Daiani and I did a number of assessments to discover whether or not mode of seize could goal completely different traits. This concerned many assessments together with the usage of swim tunnels for swimming efficiency, mazes for exploratory behaviour, and arenas for social behaviour. We’re excited to see the place this takes us subsequent over the course of my PhD.

This was an enormous enterprise, and wouldn’t have been attainable with out Daiani (our logistical powerhouse), our native guides and companion fishers (with out whom we might actually be misplaced), and the Naked neighborhood, who welcomed us into their properties, made us unimaginable meals, and allowed us to make use of their restaurant as a makeshift Lab. I’m additionally grateful to the British Society of the British Isles for funding this challenge. The work would have been not possible with out all of those companions and I’m extraordinarily grateful.

Banner Picture by LiChieh Pan out there beneath the inventive commons license CC BY-NC-SA 2.0

Mar Pineda (she/her) is a second 12 months PhD pupil at SBOHVM whose analysis focuses on fisheries and environmental change. Alongside her PhD, she additionally has a terrific curiosity in Science Communication and Educating.