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Kamis, 09 Agustus 2012

Ikan Plectropomus leopardus Juga Sakit Kanker

News KeSimpulan.com - Ikan juga sakit kanker kulit. Mungkin sudah waktunya ikan menggunakan sunblock. Laporan pertama ditemukan kanker kulit pada ikan liar.

Ikan Coral Trout Plectropomus leopardus yang berenang di Great Barrier Reef Australia memiliki Lesi dan patch gelap versi melanoma seperti pada manusia. Kanker kulit pertama yang dilaporkan ditemukan pada ikan liar.

Plectropomus leopardus masuk ke dalam daftar hewan liar baru yang telah dikenal menderita kanker termasuk Tasmania Cevil dan Paus Beluga.

Berawal ketika sebuah tim biogeografer Australian Institute of Marine Science di Townsville, Australian, sedang menyelidiki hiu di Great Barrier Reef.

Seekor ikan karang yang dimakan hiu memiliki patch hitam di kulit. Pada awalnya, peneliti berpikir patch disebabkan jamur.

Tapi ketika mereka mengirim sampel jaringan ke Newcastle University di Inggris tidak ditemukan bukti infeksi mikroba. Terlebih lagi tidak ditemukan polutan di Barrier Reef yang sangat terlindung.

Great Barrier Reef terletak tepat di bawah lubang terbesar di lapisan ozon yang berarti wilayah terpapar radiasi UV secara signifikan lebih kuat dibanding tempat lain di muka Bumi. Hanya tinggal satu tersangka utama yaitu kanker kulit.

Sel-sel kulit dari lesi dipajang di bawah mikroskop. Tidak seperti sel-sel kulit ikan normal, sel kanker berkerumun erat dan menghasilkan pigmen di situs yang biasanya tidak ada.

"Ada kemungkinan melanoma lebih cepat," kata Michael Sweet, mickobiolog Newcastle University

Tiga spesies terkait mungkin kawin silang satu sama lain sehingga keturunan lebih rentan karena hilangnya mutasi gen tertentu. Tidak jelas apakah kualitas ikan kanker menimbulkan bahaya bagi manusia yang memakan. Untuk saat ini kanker kulit hanya ikan dari ujung selatan Great Barrier Reef.

"Mereka meneliti ikan trout karang untuk waktu yang lama dan menarik bahwa pengamatan terbaru mungkin memiliki komponen genetik," kata Christopher Lowe, biogeografer California State University.

Namun, Lowe memperingatkan meskipun radiasi UV tampaknya mungkinan terbesar pelakunya, masih mungkin polutan yang tidak terdeteksi juga menjadi faktor penyebab.
Evidence of Melanoma in Wild Marine Fish Populations

Michael Sweet1, Nigel Kirkham2, Mark Bendall1, Leanne Currey3, John Bythell1,4, Michelle Heupel5,6
  1. Coral Health and Disease Laboratory, School of Biology, Newcastle Institute for Research on Sustainability, Newcastle University, Newcastle upon Tyne, United Kingdom
  2. Cellular Pathology, Royal Victoria Infirmary, Newcastle upon Tyne, United Kingdom
  3. AIMS@JCU, Australian Institute of Marine Science, School of Earth and Environmental Sciences, Fishing and Fisheries Research Centre, James Cook University, Townsville, Australia
  4. Research Office, University of the South Pacific, Suva, Fiji
  5. Australian Institute of Marine Science, Townsville, Australia
  6. Fishing and Fisheries Research Centre, School of Earth and Environmental Sciences, James Cook University, Townsville, Australia
PLoS ONE 7(8): e41989, August 1, 2012

Akses : DOI:10.1371/journal.pone.0041989
Gambar : Michelle Heupel

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