Abstract. Hasani Q, Yusup MW, Caesario R, Julian D, Muhtadi A. 2022. Autoecology of Ceratium furca and Chaetoceros didymus as potential harmful algal blooms in tourism and aquaculture sites at Teluk Pandan Bay, Lampung, Indonesia. Biodiversitas 23: 5670-5680. Harmful algal blooms (HABs) phenomenon has been observed around tourism and aquaculture sites in Teluk Pandan Waters, Lampung Bay. The dominant potential HABs found in Teluk Pandan waters were Ceratium furca and Chaetoceros didymus. This study aimed to analyze the relationship between the environmental physicochemical factors and the abundance of C. furca and C. didymus as potential HABs. Phytoplankton samples were collected from four stations (Hurun Bay, Sidodadi Coastal Waters, Sari Ringgung Beach and Cikunyinyi Bay) during May-August 2022. Physical parameters (temperature, depth, brightness, current velocity and salinity), as well as chemical parameters (dissolved oxygen, pH, phosphate, nitrite, nitrate and ammonia) were all measured in conjunction with phytoplankton sampling. Canonical correlation analysis and multiple regression were used to predict the effect of environmental parameters on phytoplankton density. Blooms of C. furca were found with the highest density at 5.417×106 cells/L in Cikunyiyi Bay, while C. didymus predominated in Hurun Bay (2.890×104 cells/L), Sidodadi Coastal Waters (3.923×104 cells/L) and Sari Ringgung Beach (3.531×104 cells/L). The main factors influencing the increase in C. furca population at Cikunyinyi Bay were pH, phosphate and nitrate. The increase in C. didymus population at Sidodadi Coastal Waters was affected by phosphate, nitrate and nitrite, while phosphate and nitrate influenced the increase in C. didymus population at Sari Ringgung Beach. Potentially HABs density was found to be higher near intensive shrimp farming sites. The use of fertilizer and artificial feed in high quantities is thought to be responsible for increased water eutrophication. Periodic monitoring and consistent determination of environmental carrying capacity for intensive shrimp farming activities are required to control HABs and ensure the sustainability of aquaculture and tourism activities in Teluk Pandan Waters.

Sand mining activities in Pasir Sakti District, East Lampung Regency, have changed the landscape and the allotment of land around it. The former sand mining area now becomes large puddles that are not utilized. This study aimed to analyze the suitability of water quality in ex-sand mining areas for tilapia (Oreochromis niloticus) culture. Observations were carried out at three stations in January-October 2019. Water quality measurements were performed to check water depth, clarity, temperature, current, dissolved oxygen, pH, salinity, nitrate, phosphate, iron, sulfate, and phytoplankton density. Analysis of suitability for aquaculture was carried out using weighting and scoring methods. Based on the results of the suitability analysis, the scoring result of the sand mining land for O.niloticus culture was in the range of 64% -68%. This score is classified as marginally suitable. The parameters with low scores are clarity, dissolved oxygen, temperature, pH, ammonia, phosphate, and iron (Fe) concentration parameters. Meanwhile, salinity, nitrate, sulfate, and phytoplankton density indicate conditions that are suitable for aquaculture. Therefore, severe treatment is needed to improve water quality to make it ideal for O.niloticus culture.

One of the important factor which determine the success of handline fishing operation is bait. Normally, fishermen use natural bait, goldstripe sardinella and Indian mackerel, to catch hairtail. However, those fish has a high price and not always availabe. This study aims 1) to analyze the composition of the catch, 2) to analyse the weight-length distribution of the catch 3) to measure the productivity of catch based on bait type. The research was conducted by using experimental fishing. The obtained catch was small-head hairtail (Lepturacanthus savala) with a total of 1.148 individuals, weighing of 235.58 kg. Length-weight relationship of small-head hairtail (Lepturacanthus savala) is y=0.0008x 3.0113 , which is positive allometric. The productivity of handline using natural bait was 5.95 kg per trip while the productivity of handline with artificial bait was 5.26 kg per trip. However, artificial bait can be used as an alternative to substitude natural bait for catching small-head hairtail when natural bait is not available or in a season when hairtail is hard to catch.Keyword: artificial bait, handline, Lepturacanthus savala,, small-head hairtail ABSTRAKSalah satu faktor penting yang menentukan tingkat kesuksesan operasi penangkapan pancing ulur adalah umpan. Nelayan biasanya menggunakan umpan alami, tembang dan kembung, untuk menangkap layur. Namun, ikan tersebut memiliki harga yang cukup tinggi dan ketersediaannya tidak kontinyu. Penelitian ini bertujuan untuk 1) menganalisis komposisi hasil tangkapan pancing ulur, 2) menganalisis sebaran panjang-berat, 3) mengukur produktivitas hasil tangkapan pancing ulur berdasarkan jenis umpan yang digunakan. Penelitian dilakukan dengan metode experimental fishing di perairan Teluk Palabuhanratu pada bulan Desember 2015-Januari 2016. Hasil tangkapan yang diperoleh adalah layur sirip kuning (Lepturacanthus savala) sebanyak 1.148 ekor, dengan berat 235.58 kg. Persamaan hubungan panjang -berat layur (Lepturacanthus savala) adalah y=0.0008x 3.0113 yang berarti allometrik positif. Produktivitas pancing ulur menggunakan umpan alami sebesar 5.95 kg/trip, lebih besar dibandingkan produktivitas umpan tiruan sebesar 5.26 kg/trip, namun umpan tiruan dapat digunakan sebagai alternatif substitusi umpan alami untuk menangkap layur ketika umpan alami sedang tidak tersedia atau saat musim paceklik.Kata kunci: layur sirip kuning, Lepturacanthus savala, pancing ulur, umpan tiruan

Teluk Kiluan memiliki keindahan alam dan sumberdaya alam yang beragam sehingga kawasan ini menjadi destinasi wisata. Selain terdapat kegiatan wisata di Teluk Kiluan juga terdapat aktivitas perikanan tangkap. Aktivitas wisata dan perikanan ini berada dalam satu zona pemanfaatan yang sama. Peningkatan aktivitas wisata dan perikanan tangkap di Teluk Kiluan akan berakibat terjadi degradasi sumberdaya yang ada di sekitar Teluk Kiluan apabila tidak dikelola dengan baik. Aktivitas perikanan tangkap yang ada di Teluk Kiluan yaitu menggunakan alat tangkap longline. Maka aktivitas penangkapan perlu diatur seperti mengetahui tingkat ramah lingkungan alat tangkap longline. Penelitian ini dilaksanakan pada bulan Desember 2022 di Teluk Kiluan. Metode yang digunkan yaitu dengan snowball sampling dengan analisis data berdasarkan sembilan kriteria alat tangkap ramah lingkungan yang ditetapkan oleh FAO. Hasil penelitian yang diperoleh yaitu alat tangkap longline tergolong alat tangkap yang sangat ramah lingkungan dengan total skor 30,4 sehingga dalam aktifitas penangkapan ikan menggunakan longline dapat mendukung pengembangan ekowisata di Teluk Kiluan.

Ekosistem mangrove di Pesisir Kabupaten Tangerang memiliki fungsi secara ekologi, ekonomi, serta sosial yang harus dikelola dengan tepat agar menjamin keberlanjutannya. Tujuan dari penelitian ini, yaitu: (1) Menganalisis aspek pendukung dalam pengelolaan ekosistem mangrove di Kabupaten Tangerang dan (2) Mendeskripsikan status keberlanjutan dari berbagai aspek dalam pengelolaan ekosistem mangrove di Kabupaten Tangerang. Penelitian ini dilaksanakan pada Bulan Maret 2021 berlokasi di 6 desa (Kronjo, Patra Manggala, Ketapang, Margamulya, Tanjung Burung dan Tanjung Pasir) di Pesisir Kabupaten Tangerang. Responden sebagai sumber informasi berasal dari pemerintah, masyarakat dan Lembaga Swadaya Masyarakat terkait penelolaan mangrove yang dipilih menggunakan purposive sampling. Analisa data penentuan status keberlanjutan dan atribut pengungkit menggunakan metode Rapfish dengan pendekatan multidimensional scaling (MDS). Hasil penelitian menunjukkan bahwa pengelolaan ekosistem mangrove pada 4 dimensi termasuk dalam kategori cukup berkelanjutan. Atribut penunjang yang digunakan untuk meningkatkan status keberlanjutan pengelolaan ekosistem mangrove yaitu, rehabilitasi sebagai upaya pemulihan ekosistem mangrove, rerata penghasilan terhadap upah minimum masyarakat, anggaran pemerintah untuk pengelolaan mangrove, konflik sosial, akses masyarakat lokal terhadap ekosistem mangrove, penegakan hukum dan keterlibatan lembaga masyarakat