Bagus Dwi Hari Setyono
Program Studi Budidaya Perairan, Jurusan Perikanan dan Ilmu Kelautan, Fakultas Pertanian, Universitas Mataram

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Struktur Komunitas Lamun di Perairan Ketapang, Lombok Barat Muh Fahruddin; Adi Suriyadin; Heri Murtawan; Muhammad Haikal Abdurachman; Bagus Dwi Hari Setyono; Ardyen Saputra; Anita Prihatini Ilyas
Journal of Marine Research Vol 12, No 1 (2023): Journal of Marine Research
Publisher : Departemen Ilmu Kelautan, Fakultas PerikanJurusan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jmr.v12i1.34537

Abstract

Ekosistem lamun adalah salah satu ekosistem laut dangkal yang mempunyai peranan penting dalam kehidupan biota laut dan merupakan salah satu ekosistem bahari yang paling produktif. Ekosistem lamun saat ini kurang mendapat perhatian dikarenakan kurangnya pengetahuan masyarakat tentang fungsi ekosistem lamun. Akibatnya, upaya masyarakat dalam menjaga kelestarian ekosistem ini sangat minim bahkan terkadang dianggap sebagai tanaman pengganggu, sehingga akhirnya diabaikan atau dimusnahkan. Penelitian in bertujuan menjabarkan kajian ekologi struktur komunitas lamun di perairan Dusun Ketapang, Kecamatan Sekotong Barat, Kabupaten Lombok Barat. Metode yang digunakan dalam penelitian ini adalah percobaan langsung di lapangan dengan mengguanakan teknik pengambilan contoh secara purposive sampling Pengamatan struktur komunitas lamun menggunakan transek kuadran berukuran 50x50 cm dengan jumlah stasiun yang ditetapkan sebanyak 3 (tiga) stasiun. Jarak dan tata letak stasiun berdasarkan pendekatan habitat mangrove, lamun, dan terumbu karang dengan pengulangan sebanyak tiga kail, sehingga dalam penelitian ini terdapat 9 (sembilan) transek kuadran. Adapun terkait pengukuran kualitas air dilakukan secara in situ. Hasil penelitian menunjukkan bahwa terdapat 4 jenis lamun, yaitu Enhalus acoroides, Thalassia hemprichii, Cymodocea rotundata, dan Halophila ovalis. Struktur komunitas lamun seperti kerapatan, frekuensi, dan penutupan maupun kontribusinya di perairan Dusun Ketapang didominasi oleh jenis Cymodocea rotundata.  The seagrass ecosystem is one of the shallow marine ecosystems that has an important role in the life of marine life and is one of the most productive marine ecosystems. Seagrass ecosystems are currently receiving less attention due to the lack of public knowledge about their functions of seagrass ecosystems. As a result, the community's efforts to preserve this ecosystem are minimal, and sometimes they are considered nuisance plants, so they are eventually ignored or destroyed. This study aims to describe an ecological study of the structure of the seagrass community in the waters of Ketapang Hamlet, West Sekotong District, West Lombok Regency. The method used in this research is a direct experiment in the field by using a sampling technique using purposive sampling. Observation of the structure of the seagrass community using a quadrant transect measuring 50x50 cm with a set number of 3 (three) stations. The distance and layout of the station are based on the approach of mangrove, seagrass, and coral reef habitats with three hooks repeating so that in this study there were 9 (nine) quadrant transects. As for the measurement of water quality carried out in situ. The results showed that there were 4 types of seagrass, namely Enhalus acoroides, Thalassia hemprichii, Cymodocea rotundata, and Halophila ovalis. The seagrass community structure such as density, frequency, and cover as well as its contribution 
Paparan Subletal Mikroplastik Polistirena pada Media Pemeliharaan Menurunkan Pertumbuhan dan Efisiensi Pemanfaatan Pakan Udang Vaname (Litopenaeus vannamei) Bagus Dwi Hari Setyono; Nurbaiti Saptatriani; Laily Fitriani Mulyani
Jurnal Akuakultur Rawa Indonesia Vol. 14 No. 1 (2026): JARI: JURNAL AKUAKULTUR RAWA INDONESIA
Publisher : Program Studi Budidaya Perairan, Fakultas Pertanian, Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jari.v14i1.132

Abstract

Microplastic contamination is increasingly relevant in shrimp farming because plastic particles may originate from water, feed, equipment, packaging, and polystyrene-based foam materials commonly used throughout aquaculture supply chains. This study evaluated the effects of sublethal exposure to polystyrene microplastics (PS-MPs) in the rearing medium on growth performance and feed utilization efficiency of whiteleg shrimp (Litopenaeus vannamei). A completely randomized design was applied using four nominal concentrations of PS-MPs (0, 10, 20, and 30 mg/L), each with three replicates. PL-30 shrimp were reared for 45 days at a density of 20 individuals per 20-L container. The assessed parameters were absolute length growth, absolute weight growth, specific length growth rate, specific weight growth rate, feed conversion ratio (FCR), and feed utilization efficiency (EPP). Analysis of variance showed that all production parameters were significantly affected by treatment (p<0.001). The control consistently produced the highest values for growth-related traits and EPP, whereas the lowest values were generally observed at 30 mg/L. In contrast, FCR increased markedly in all exposed groups relative to the control. From the control to 30 mg/L, absolute length declined by 31.8%, absolute weight by 53.4%, specific weight growth by 54.0%, and EPP by 65.4%, while FCR increased by 141.4%. These findings indicate that PS microplastics in the culture medium are strongly associated with reduced production performance of whiteleg shrimp, especially through poorer growth and less efficient feed utilization.