Author Archives: fishthinkers

About fishthinkers

fishthinkers.wordpress.com Instagram: @fish_thinkers

Vote 1 in FlyLife Photo Comp

Voting is now open for the Fly Life Magazine‘s photo competition and all of the finalists have some cracking entries.

Big congrats to our mate Angus Kennedy for reaching the finals with his shot of Matt guiding his canoe down the rapids of a remote south coast Bass stream.

Please give him your vote to help his chances of reaching a top 3 placing so he can win some much needed fly fishing gear!

Voting  only takes a couple of seconds and closes this Friday the 10th at 6pm!

Vote here : https://flylife.com.au/flylife-photo-competition-2017

More of Gus’ pics from the trip below…

12628435_10153534409064811_2652334965489078011_o

12493987_10153534414864811_7416333006652588792_o

12605328_10153534417549811_5319061348703363008_o

12594001_10153537445019811_1298888214789959819_o

12622046_10153537445014811_3670839465906027247_o (1)

Top shelf bottom feeders

1

If you are in Jervis Bay and see someone knee deep surrounded by rays or alternatively sitting staring at rays for hours on end then chances are you are looking at the “mother of rays”  otherwise known as  Joni  – the driving force behind the Stingray Diaries. She’s studying smooth stingrays throughout the Jervis Bay Marine park, in conjunction with Fisheries NSW and gives us a rundown on her research in her guest blog below…

Top shelf bottom feeders

Learning to swim by getting thrown off the end of a busy public wharf on the Hawkesbury River in nothing but a pair of hot pink floaties… Living in a swimsuit and covered in sand every single day of the year… Chucking tantrums when told to come inside after playing on the beach all day because it was dark… At the age of 4, saying with great certainty, “Mum, when I grow up I’m going to be a Marine Biologist.” Continue reading

Backyard Habitat Ponds 101

OLYMPUS DIGITAL CAMERA

Damien Vella is Senior Horticulturist at the Botanic Gardens and does a great job of sharing natural history moments he encounters throughout his life on his instagram account. He has a particular skill for taking events from the backyard and telling a story that weaves in the underlying ecology in a fascinating way. He also shares one of my deep interests-that is creating habitat in backyards (Even better that it is the aquatic type).

Below is his guest blog discussing backyard habitat ponds… Continue reading

Tagging along with the Coastal Carolina University Shark team

 

Caroline (from over at CCU Shark Research Team) stopped by the Fish Thinkers blog to give us a run down on where her research is headed and a sneak peak into the world of grad student shark research in the United States. Continue reading

Why Salmon can’t be on the menu anymore

We as consumers, particularly in western countries, are pretty boring when it comes to our seafood. Given the diversity of fish in our oceans this seems pretty strange. It’s like our taste buds are only fond of a handful of species such as tuna, cod, salmon, flake etc. But our obsession for these fish (majority of which are apex predators), has resulted in many of their stocks becoming overfished and deterioration of the ecosystems in which they live in. So it’s time we started mixing things up in terms of what seafood we catch, order, buy and cook!! This leads me to today’s guest post by Lauren Yates of Ponytail Journal. Lauren runs a super successfully blog covering all things from fashion, food and travel. When it comes to cooking, Lauren is a huge advocate of using sustainable seafood, regularly encouraging her followers to steer clear of the ‘trendy’ species that are overexploited and explore more sustainable options. Read her post below on why salmon can’t be on the menu anymore… Continue reading

Eat or be eaten: invasive fish forces shrimp to make tough life decisions

This guest post by Laura Lopez, a PhD candidate from the University of Wollongong who is looking at the behavioural interactions between the introduced Eastern Mosquito fish and native fauna. Below is a summary of her awesome work on glass shrimp. Laura is also assessing the impact of Eastern Mosquito fish on Australian Bass so hopefully we can get an update on this work later in the year!


Eat or be eaten: invasive fish forces shrimp to make tough life decisions

by Laura Lopez

Predation is often presented as a rather simple, albeit dramatic sequence. We might think of a cheetah chasing down a lone gazelle, or the aerial aerobics of a great white shark ambushing a rather unfortunate sea lion. While it’s true that the immediate impact of predation is one less prey animal and one satisfied predator, there is a whole other side to this interaction that we can’t easily see.

In reality, predation is actually a complex interaction, the outcome of which depends on predator behaviour and motivation, prey behaviour and the environment. Fear of a predator itself has a powerful effect on prey animals and can be both a blessing and a curse. For example, while hanging out on the beach might help a sea lion avoid a shark attack, it also prevents it from feeding. Therefore, while avoiding exposure to predators might help prevent being eaten (known as a consumptive effect) it also leads to a loss of fitness in the long term (known as a non-consumptive effect).

For prey to make the most of this trade-off, they need to be able to tell when it’s a good time to go out, or a good time to stay home. A further complication is the fact that predator density and therefore behaviour can vary, as can the time of day. I’ve been researching this conundrum by observing how different densities of the invasive freshwater Eastern Mosquito fish, Gambusia holbrooki, predate upon and alter the behaviour of a native glass shrimp, Paratya australis, during the day and at night. The Eastern Mosquito fish is a tiny but devastating introduced species which has been very successful in Australia. However, we don’t know much about how it’s interacts with native species as a predator.

Shrimp

Female (berried) glass shrimp. Elastomer tag injected into the tail to allow individuals to be identified.

 

Continue reading