The aim of this study was to determine hard coral cover at the time before (2015), during (2016) and after coral bleaching (2017) in Krueng Raya, Aceh besar. This study was conducted on April 2017 in Krueng Raya, Aceh Besar. Data collection was carried out at 3 observation stations using the PIT (Point Intercept Transect) method which included : Fort Inong Balee, Ahmad Rhang Manyang, and Lhok Mee. The results showed that the average percentage of hard coral cover in 2017 was 22.90% (bad category), it was lower than in 2016 32.43% (medium category) and in 2015 was 52.83% (good category). There were found 16 genera of coral (2015), 18 genera of coral (2016), and 8 genera of coral (2017). Mortality Index (MI) in 2015 ranged between 0.02-0.20 (low coral mortality rate), in 2016 ranged between 0.13-0.49 (low coral mortality rate), in 2017 ranged between 0.63-0.79 (high coral mortality rate). The results of this study indicate that the percentage of hard coral cover has decreased to reach 50% due to coral bleaching in the waters of Krueng Raya Aceh Besar. ABSTRAKPenelitian ini bertujuan untuk mengetahui tutupan karang keras pada waktu sebelum (tahun 2015) saat (2016) dan sesudah pemutihan karang (2017) di Krueng Raya, Aceh Besar. Penelitian ini dilakukan pada bulan April 2017 di Krueng Raya, Aceh Besar. Pengambilan data dilakukan di 3 stasiun pengamatan menggunakan metode PIT (Point Intercept Transect) yang meliputi: Benteng Inong Balee, Ahmad Rhang Manyang, dan Lhok Mee. Hasil penelitian menunjukkan persentase rata -rata tutupan karang keras tahun 2015 sebesar 52,83% berkategori baik, tahun 2016 sebesar 32,43% berkategori sedang dan tahun pada tahun 2017 persentase tutupan karang keras menjadi 22,90% dan masuk ke dalam kategori rusak. Terdapat sebanyak 16 genus karang (2015), 18 genus karang (2016) dan 8 genus karang 8 (2017). Indeks Mortalitas (IM) tahun 2015 berkisar antara 0,02-0,20 (tingkat kematian karang yang rendah), tahun 2016 berkisar antara 0,13-0,49 (kematian karang rendah), tahun 2017 berkisar antara 0,63-0,79 (tingkat kematian karang tinggi). Hasil penelitian ini menunjukkan bahwa persentase tutupan karang keras mengalami penurunan hingga mencapai ±50% yang diakibatkan oleh pemutihan karang pada Perairan Krueng Raya Aceh Besar.Kata kunci : indeks mortalitas, pemutihan karang, tutupan karang keras

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Coal spill in Lampuuk waters in July 2018 had released some heavy metals into the waters in form of dissolved ions. They werethen partially absorbed in the bed and affected the fluvial sediments. The objective of the research was to analyse the heavy metals; Mn, Pb, Cu and Cd content in fluvial sediments affected by coal spill water in Lampuuk, Aceh Province, Indonesia.The fluvial sediments from five stations of Lampuuk beach were collected in December 2018 and analyzed using Atomic Absorption Spectrophotometer (AAS), then resulted that lead (Pb) and manganese (Mn) contained in the samples, ranged from 10.14 to 15.91 and 60.25 to 98.78 mg/Kg, respectively, while copper (Cu) and Cadmium (Cd) were undetected. Based on the regulation of ANZECC (2000), lead content in the sediment was still under the threshold, but manganese was exceeded the threshold.

Identification of sea cucumbers from Benteng Inong Balee, Aceh Besar and their phytochemistry screening were conducted in December 2020 to January 2021 at Laboratory of Marine Chemistry and Fisheries Biotechnology, Universitas Syiah Kuala. The purpose of this study was to identify the species of sea cucumbers and its secondary metabolite content using phytochemistry screening and column chromatography. The species of sea cucumbers that were identified was Holothuria atra. The extraction method used in sea cucumber extraction was maceration method, while the separation of secondary metabolites used column-chromatography with eluent of n-hexane : ethyl acetate (8:4). The results showed that secondary metabolites obtained from phytochemical tests were flavonoids, saponins and triterpenoids.

The STORET method is one of the methods commonly used to determine water quality. This water quality status can indicate the waters are in a polluted condition or in good condition referring to the predetermined water quality standard. This study aims to obtain an overview of the status of water quality in the northern waters of Banda Aceh. Activities in the area such as the transportation route of ships, port activities, tourism, aquaculture and disposal of household waste are source of pollutan in the waters. Water sampling was carried out at 10 points (stations) around the waters of Ulee Lheu, Krueng Aceh and Alue Naga. The parameters used are: ammonia content, sulfide, cyanide, phenol, surfactant, and fatty oil. The results showed that the water quality in Ulee Lheu classify into Class C (score –16), which was medium polluted, with ammonia and phenol content 1.1 mg/L and 0.014 mg/L, respectively. Meanwhile, the estuary of Krueng Aceh and the waters around of Alue Naga are categorized in Class A (score 0), that means both are still in accordance with water quality standards.