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The Port Jackson shark is a nocturnal species which peaks in activity during the late evening hours before midnight and decreases in activity before sunrise. [2] A study showed that captive and wild individuals displayed similar movement patterns and the sharks' movements were affected by time of day, sex, and sex-specific migrational behaviour.
This results in blood coming from the body losing its heat so that by the time it interacts with cold water from the gills, it is about the same temperature, so no heat is lost from the body to the water. Blood coming towards the body regains its heat, allowing the shark to maintain its body temperature.
Having the ability to keep their warmth helps them as predators as well. Another group of sharks, known as the mackerel sharks are able to warm their blood. These mackerel sharks retain their blood by using a heat exchange system called rete mirabile. The body temperature of mackerel sharks can be up to 10 o higher than the surrounding water. [10]
Sharks are colorblind, but attracted to contrasting color. These colors are your best bet for ocean waters. How to avoid sharks visiting Washington state waters.
Sharks are more likely to attack when there is only one person in the water. Avoid activity in areas with poor water visibility, such as near river mouths or after periods of heavy rainfall.
The bigeye thresher does possess a highly developed rete system around its brain and eyes. This is thought to function in buffering those sensitive organs against temperature changes during the shark's daily migrations up and down the water column, which can be as much as 15–16 °C (59–61 °F). [11]
"Similar to encountering a wild animal on land, you want to remain calm, make yourself appear as large as possible, keep sight of the shark, and slowly move away, exiting the water calmly as soon ...