Pulau Tanakeke terletak di Kecamatan Kepulauan Tanakeke Kabupaten Takalar merupakan salah satu wilayah yang memiliki keanekaragaman ekosistem mangrove yang cukup tinggi. Daerah pesisir pulau tersebut sebagian besar dikelilingi oleh ekosistem mangrove, namun dalam lima (5) tahun terakhir mengalami penurunan luasan. Penelitian ini bertujuan untuk mengetahui perubahan tutupan dan kerapatan mangrove di Pulau Tanakeke antara tahun 2017 sampai tahun 2022. Pengambilan data pada penelitian ini dilaksanakan pada bulan Januari-Agustus 2022 yang berlokasi di Pulau Tanakeke Kabupaten Takalar Provinsi Sulawesi Selatan. Penelitian ini menggunakan metode Normalized Difference Vegetation Index (NDVI) dengan analisis citra satelit landsat 8 dan dioverlay dengan hasil groundchek ekosistem mangrove. Berdasarkan hasil penelitian menunjukkan ada 11 jenis mangrove ditemukan di Pulau Tanakeke yaitu: Rhizophora stylosa, Rhizopohora mucronata, Sonneratia alba, Excoecaria ahallocha, Bruguiera gymnorrhiza, Lumnitzera racemosa, Rhizophora apiculata, Avicennia alba, Heritiera littoralis, Gymnanthera paludosa, Pemphis acidula. Analisis GIS mendapatkan luasan hutan mangrove di Pulau Tanakeke yaitu tahun 2017 seluas 1792,76 ha, tahun 2018 seluas 1778,27 ha, tahun 2019 seluas 1768,42 ha, tahun 2020 seluas 1712,25 ha, tahun 2021 seluas 1686,43 ha dan tahun 2022 seluas 1678,66 ha.
Siganus sp is one of the leading commodities that have high economic value. Until now, the market demand for Siganus sp continues to increase so that the prospect of its cultivation is very promising. The problem that arises specifically for fishermen in the coastal sub-district of Maros Regency is that there is no data and knowledge about suitable locations for the cultivation of Siganus sp. This study aims to determine the area that is suitable for cultivation of Siganus sp in the coastal district of Maros Regency. Data collection techniques were carried out by literature studies and direct field observations by taking coordinates and measuring oceanographic parameters (temperature, salinity, pH, brightness, dissolved oxygen, depth, current velocity). Water quality data were analyzed by weighting, overlaying and layout using GIS analysis. This research was conducted in the waters of the coastal sub-district of Maros Regency in January-August 2021. The results showed that the location of the suitability of Siganus sp aquaculture waters in the coastal sub-district of Maros Regency obtained suitable waters (S) for the development of Siganus sp cultivation covering an area of 630.36 ha and waters that are not suitable (N) for the development of cultivation Siganus sp covering an area of 681.2 ha.
Embryonic development of Asian seabass, Lates calcarifer is a critical phase in the success of larval rearing production in a hatchery. Low production of larvae has been the drawback of the Asian seabass aquaculture owing to diseases and microbial infection to the eggs, causing low egg viability. This study aims to evaluate the effect of different doses of papaya leaf extracts during embryonic development to improve egg hatchability and larval survival. Six different doses of papaya leaf extracts of 2, 4, 6, 10, 20, and 25 mL were used as treatments arranged triplicates in five liter aquaria. The newly fertilized eggs (99 eggs) were immersed in each treatment for five minutes and fifteen seconds. Subsequently, the eggs were moved into 10 L incubation tanks, and samples were collected for embryogenesis observation. The hatchability of eggs was significantly different among treatments. The hatchability of larvae in group with dose of 4 mL was the best treatment (93.94 ± 0.1%) followed by 2 mL (93.88 ± 3%), and 6 mL (90.91 ± 3.0%). The different doses of papaya leaf extract significantly affected larval survival. The highest survival rate of larvae was 2 mL (93%) followed by 4 mL (90%) and 6 mL (70%). There was no significant difference in the hatching time of larvae. The fastest hatching time occurred at the dose of 6 mL about 13 hours and 30 minutes, followed by 2 mL and 4 mL treatment for about 14 hours. This study recommends that the doses of 2 mL or 4 mL of papaya leaf extracts have potential impacts on the improvement of larval rearing production for Asian seabass hatchery.
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