Abstract
Nusa Dua is a popular tourist resort in Bali, where many hotels and other tourist facilities were built. In this resort, the sewage is centralized processed in a Sewage Treatment Ponds called “Unit Pengolahan Air Limbah PT ITDC” which is also often called Lagoon Nusa Dua. Nusa Dua sewage treatment ponds have 5 units of ponds, namely Pond 1A, 1B, 2A, 2B, and Pond 3. In ponds 2B and 3, tilapia fish (Oreochromis mossambicus Linn.) was raised as a water quality bio-indicator. The aim of this research was to determine the histology condition of the gill of tilapia fish that raised in the Nusa Dua sewage tretment ponds which were then used as an indicator of water quality in these ponds. The research employed a complete randomized design in which 16 samples were taken from two sampling sites with eight replications. Results of this research showed that histologic changes of the gill that were observed including edemas, fusions, and hyperplasias of secondary lamellas as well as telangiectases.
 
 Keywords: Nusa Dua sewage, Oreochromis mossambicus L., gills, histology, bioindicator
Highlights
Nusa Dua is a popular tourist resort in Bali, where many hotels and other tourist facilities were built
the sewage is centralized processed in a Sewage Treatment Ponds called
determine the histology condition of the gill of tilapia fish that raised in the Nusa Dua sewage tretment ponds
Summary
Pengembangan Pariwisata Bali (PERSERO) untuk menciptakan suatu kawasan perhotelan dengan luas 320 Ha dan kawasan tersebut diberi nama Nusa Dua-ITDC (Indonesia Tourism Development Corporation). Selanjutnya air mengalir ke kolam 3, pada kolam 2B dan 3 sengaja ditebar ikan mujair (Oreochromis mossambicus Linn.) untuk memantau kualitas perubahan air (Wijaya dan Putra, 2013). Masuknya bahan pencemar di perairan dapat menurunkan kualitas air dan kerusakan struktur histologi beberapa organ pada ikan (Mandia dkk., 2013). Pihak lagoon setiap tahun rutin mengadakan uji kualitas air, tetapi hingga saat ini belum pernah dilakukan pengujian kualitas air dengan menggunakan indikator ikan yang ditebar di lagoon tersebut, terutama aspek histologinya. Berdasarkan permasalahan tersebut, maka perlu dilakukan penelitian mengenai gambaran histologi insang ikan Mujair (Oreochromis mossambicus Linn.) yang hidup di air lagoon Nusa Dua, Bali
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