SUNDAY SCIENCE 👨🔬🦈👩🔬 Did you know that finding bull sharks (Carcharhinus leucas) in freshwater systems can be a good indication for the health of the surrounding ecosystems?
C. leucas has a high euryhaline tolerance, meaning they are able to adapt to a wide range of salinities. They have been found in 0 ppt (freshwater), 35 ppt (seawater) and even in hyperhaline (>40ppt) waters (that can be 50% saltier than normal seawater) (Nicholls 2017). Taking advantage of these ecological niches means that they are one of the only apex predators in freshwater systems.
However, this also puts them at a very high risk of anthropogenic threats such as fishing pressure and habitat destruction or modification.
C. leucas can only make use of estuaries when these are not damaged by siltation, pollution, sewerage or the lack of water from upper inland areas (Olbers 2012). Let's all take care of our ecosystems by using environmentally friendly products and only consuming sustainably caught seafood!
You can learn more about C. leucas and other sharks in our FREE online courses! Or come and join an internship, bull sharks are not a rare sighting here in Sodwana Bay 😊
#sharks #bullshark #sharkconservation #marineinternship #marinebiology #sharklife #southafrica #freedivinginternship - 1 month ago