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Scaring Nemo

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A pair of anemonefish hiding from divers in
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How do clownfish on coral reefs react to an encounter with humans underwater for few species of anemone,” Trnski explains.
encounters with humans? a limited time due to the small size and “In order to find a suitable host anemone, AJ Park, Level 22, Aon Centre, 1 Willis Street, Wellington 6011, New Zealand
Human intervention is putting marine localization of their anemone. the dusky anemonefish can benefit from
ecosystems under increasing pressure. On During their investigations in Vanuatu, fearlessly searching the reef - even if
coral reefs, rising water temperatures, the researchers focused on two species of this behaviour also makes them more
ocean acidification, pollution from plastic clownfish - the Clark’s anemonefish and susceptible to predators. But it is precisely
waste or overfishing threaten the organisms the dusky anemonefish. They wanted to this fearlessness that is also revealed by the
living there - be they fish, sea cucumbers know whether these species changed their fact that they do not flee from humans.
or corals. But how does the direct physical behavior when encountering humans.
presence of humans under water change the Lead author Lena Trnski snorkeled out Courage pays off
behaviour and ecology of animals on coral to the reefs off Efate island and videoed Their observations led the researchers to
reefs? the reactions of clownfish. To simulate conclude that in regions with a high level of
Researchers from AUT’s School of the presence of an observer, she hovered tourism, ‘courageous’ clownfish species such
120 AMY STREET, TOORAK, SUVA, FIJI ISLANDS
Science and the Leibniz Centre for Tropical one to three meters above the anemone. as the dusky anemonefish could displace 120 Amy Street, Toorak, Suva, Fiji Islands • +679 3303404 / +679 9991268
3303404 / 9991268
Marine Research (ZMT) in Bremen However, she was not present during the more fearful species. “Species that retreat 5404/5405 (Vodafone & Inkk users only in Fiji) • info@ohpl.com.fj • www.ohpl.com.fj
5404 / 5405 (VODAFONE & INKK USER’S ONLY)
studied the behaviour of anemone fish video recordings recorded as control for into their anemones for protection under info@ohpl.com.fj
during encounters with humans off the comparison. She noted the behavior of each stress spend a lot of energy and time on this Your largest private hospital in Fiji and the South Pacific providing the following services and facilities:
coast of Vanuatu in the South Pacific. The fish in the anemone at 15-second intervals. A one escape behaviour and are therefore less
team, consisting of marine biologist Dr total of 60 behavioural events were recorded able to engage in foraging or reproduction,” • 24/7 General Medical Centre with 6 Consulting rooms * Ophthalmology
Armagan Sabetian (AUT), AUT marine for each anemone fish, both in Lena’s says Lilkendey. “Intrepid species have an • 2 Fully Equipped Operating Theatres * Paediatric
biology student Lena Trnski and fish presence and in her absence. advantage over them.” • 50 bed inpatient ward - (High Dependent Unit Ward/ * Physiotherapy (Inpatient)
ecologist Dr Julian Lilkendey (ZMT, came When confronted with human presence, “The resulting displacement process CICU Ward / General Wards ranging from Private * Internal Medicine
to some surprising results which have been the two species showed very different would ultimately lead to a loss of species Rooms to Shared 2/3/4 Bed wards and VIP Suite) * CT Scan Services
published in the Journal of Fish Biology. behavioural patterns. “While Clark’s diversity,” Trnski adds. • Specialist Services • Interventional cardiology (angiogram and angioplasty)
Anemonefish, also known as clownfish, anemonefish were frightened by encounters “The ecological consequences of * General Medical & General Surgical emergency • Diagnostic Radiology services comprise of X-ray,
are not only the cute protagonists in the with humans and often hid deep within behavioural changes caused by human services ultrasound, mammogram, Doppler, guided fine-needle
hit movie “Finding Nemo”, they are also the tentacles of the anemone, the dusky presence are still largely unexplored,” says * Cardiac emergencies aspiration, guided biopsies, CT scan (plain, contrast,
model organisms for behavioral studies anemonefish reacted less to the presence of Lilkendey. “We suspect that differences in * Clinical cardiology - ECG, Echocardiogram, Treadmill CT-Angio)
on fish. Clownfish live in symbiosis with a human,” reports study leader Dr. Julian the behaviour of individual animals could test • Laboratory services such as biochemistry,
sea anemones; the anemone offers the fish Lilkendey. “We actually expected that the have an impact on interactions between
protection from attackers in its tentacles dusky anemone fish would also hide from species, such as predator-prey relationships * Interventional cardiology (angiogram and angioplasty) haematology, microbiology, molecular testing for
while the clownfish defends it from invaders Lena or even attempt to chase her away, but or symbioses, which in turn affect * Nephrology (excluding dialysis at this stage) certain infectious organisms, transfusion services
and provide it with nutrition through they usually did not let her disturb them. community structures and the functioning * General Surgery • Histopathology and cytology - routine histopathology,
its food remains and excrements. When Individuals were often up to a metre outside of the entire ecosystem”. * Gynaecology fine-needle aspiration cytology, conventional PAP
guarding their host anemone, the fish show the tentacles of their anemone. * Orthopaedics smears, fluid (including cerebrospinal fluid and urine)
easily distinguishable behaviours. The close “We suspect that dusky anemonefish Trnski, L., Sabetian, A., Lilkendey, J. (2020) * Urology cytology, sputum cytology
connection to their fixed-in-place anemone display a rather bolder behaviour in the Scaring Nemo – Contrasting effects of observer * Anaesthesiology • Full Pharmacy Services
presence on two anemonefish species. Journal of
makes clownfish particularly susceptible to presence of humans, as they are a highly
Fish Biology. https://onlinelibrary.wiley.com/doi/
human presence because they can only avoid specialised species that can only inhabit a full/10.1111/jfb.14492?af=R
Islands Business, September/October 2020 41