Research on the characteristics of Mangrove Crab Habit (Scylla sp) in Silang Cadek Mangrove Ecosystem, Baitussalam Subdistrict, Aceh Besar District, Aceh Province. This study aims to determine the habitat characteristics of Mangrove Crab (Scylla sp) in the Mangrove Ecosystem of Silang Cadek. The research method is survey with purposive sampling technique. The results of the survey are described. The results of the research showed that the water temperature data ranged from 22 s.d 25°C, the pH ranged from 7.5 to 7.7, the water salinity ranged from 30‰ -34‰. Substrate loamy sand, sandy loam, sandy clay loam. There are 4 constituent species of mangrove plants namely Bruguiera gymnorrhiza, Rhizopora stylosa, Rhizopora apiculata, Avicennia marina. Macrozoobenthos found were Nerita lineata, Uca crassipes, Terebralia palustris, Terebralia sulcata, Isognomon ephippium, Saccostrea cucculata, Uca demani, Scylla serrata, Scylla olivacea, Scylla paramamosain.

The purposes of this study are to determine daily amount of land transported by the Thalassina anomala species in the mangrove ecosystem at Sungai Reuleung Leupung and determine the characteristics of bioturbation, the correlation between body size and the amount of soil transported by T. anomala and also to see the characteristics of microhabitat. The research was conducted from July 2017 until August 2017. The observation was carried out by dividing into five stations through survey methods with purposive sampling technique. The Pearson Correlation formula was applied to analyzing the effect of biosturbation activities on the environment. Environmental factors in Mud Lobster habitat are water temperature around 25°C31°C, air temperature 25°C-33°C, salinity around 17-22 %o, and soil pH ranges from 5-7,2, and water pH ranges from 5-7,4. The results show that bioturbation activities were influenced by body size, soil density and the effect of microhabitat. The average of land transported by T. anomala was 163, 82 grams from a total of 95 excreted soils with a moderate correlation of 0,535. Based on the results, it can be revealed that the capacity of land transported by T. anomala has the potential to affect surface of the mangrove ecosystem.

Abstract. The objective of this research was to find out the effectiveness of henna leaf extract (Lawsonia inermis L.) on A. hydrophila in vitro and its effect on the survival rate of Clarias gariepinus that infected by those bacterias in vivo. The research was conducted at chemistry laboratory of Teacher Training and Education 1, 2, 3, 4, and 5% extract were 5.45; 5.7; 6.5; 7.5; and 9.6 mm, respectively. The result of ANOVA test showed that henna leaf extract has a significant effect on the survival rate of catfish (P<0.05). The best survival rate was obtained at 4% of extract concentration. Keywords: Aeromonas hydrophila; henna leaf extract; catfishAbstrak. Penelitian ini bertujuan untuk mengetahui efektivitas ekstrak daun inai (Lawsonia inermis L.) terhadap A. hydrophila secara in vitro dan pengaruhnya secara in vivo terhadap kelangsungan hidup ikan lele sangkuriang (Clarias gariepinus) yang terinfeksi bakteri ini dengan cara perendaman. Penelitian ini dilakukan di Laboratorium kimia, FKIP Unsyiah dan Laboratorium Mikrobiologi Balai Budidaya Perikanan Air Payau (BBAP) Ujong Batee pada dari bulan April hingga bulan September 2015. Penelitian ini meliputi uji in vitro dengan parameter uji berupa zona hambat ekstrak terhadap bakteri dan uji in vivo dengan parameter uji berupa nilai kelangsungan hidup ikan lele sangkuriang pasca perlakuan dengan ekstrak. Konsentrasi perlakuan yang dilakukan adalah 1, 2, 3, 4, dan 5%. Hasil uji in vitro menunjukkan bahwa ekstrak daun inai (Lawsonia inermis L.) terbukti efektif terhadap Aeromonas hydrophila dengan nilai zona hambat secara berturut-turut terhadap konsentrasi 1, 2, 3, 4 dan 5% adalah 5,45; 5,7; 6,5; 7,5; dan 9,6 mm. Hasil uji ANOVA menunjukkan bahwa ekstrak daun inai berpengaruh nyata (P<0,05) terhadap kelangsungan hidup ikan lele sangkuriang. Tingkat kelangsungan hidup ikan terbaik diperoleh pada konsentrasi ekstrak 4%. Kata kunci : Aeromonas hydrophila; ekstrak daun inai; ikan lele sangkuriang PendahuluanSalah satu komoditi budidaya perikanan yang jumlah peminatnya cukup tinggi di Indonesia khususnya di Aceh adalah ikan lele, hal tersebut berdasarkan data dari KKP (2012) yang menyatakan bahwa produksi ikan lele di Aceh pada tahun 2003 sebanyak 550 ton menjadi 7.466 ton pada tahun 2010. Dari data tersebut dapat diketahui bahwa budidaya ikan lele terus mengalami peningkatan setiap tahun.Peningkatan budidaya ikan lele dilakukan dengan penerapan budidaya secara intensif. Budidaya secara intensif umumnya dilakukan dengan memelihara ikan dengan padat tebar yang tinggi. Menurut Sukenda et al. (2008), padat tebar yang tinggi dapat meningkatkan resiko penyebaran penyakit, pengendalian terhadap penyebaran penyakit harus dilakukan secepat mungkin untuk mencegah wabah penyakit yang menyebabkan kerugian bagi pembudidaya. Salah satu penyakit yang menyebabkan kematian pada ikan lele adalah MAS (Motile Aeromonads Septicaemia) yang disebabkan oleh bakteri Aeromonas hydrophila.

Bivalves Infauna is a Bivalve that lives in the bottom of the waters, including in the waters of the Rigaih mangrove ecosystem in Setia Bakti District, Aceh Jaya Regency, Aceh Province. The aim of the study was to analyze the population of Bivalve Infauna, analyze the dominance of the Bivalvia Infauna population and analyze the bottom substrate of each Bivalvia Infauna population in the waters of the Mangrove Ecosystem in Setia Bakti District, Aceh Jaya Regency, Aceh Province. The research activity was carried out in April and May 2019. The population of Bivalves Infauna used a destructive sampling method. Bivalves infauna dominance data were analyzed by dominance index, while population and environmental conditions were analyzed descriptively. The results of the study indicated that the population of Bivalves infauna in the waters of the mangrove ecosystem in the study area was Anadaragranosa, Geloinaerosa, and Dosinia sp. The dominance index of the population of Anadaragranosa.67, Geloinaerosa is 0.22, and the index of dominance of Dosiniasp is 0.11. The results also show that the environmental conditions of the substrate are sand, mud and clay. Correspondingly, the study shows that there are three populations of Bivalve Infauna that dominate the ecosystem, namely Anadara granosa and found three bottom substrates in the ecosystem studied.

Provinsi Aceh memiliki kawasan pesisir yang sangat luas, mulai dari Kabupaten Aceh Tamiang di kawasan Timur, Kabupaten Aceh Besar di kawasan Utara dan sampai ke Kabupaten Aceh Singkil di kawasan Selatan. Luasnya kawasan pesisir dengan berbagai ragam sumber daya alam yang terdapat di kawasan ini memerlukan adanya pembukuan, sehingga masyarakat dapat mengenalnya dan dapat dijadikan sebagai bahan bacaan bagi generasi penerus. Buku ini merupakan saduran dari berbagai literatur, yang membahas tentang kawasan pesisir.

Plankton has a very important role, especially from the feed chain (the main producer) and as a bioindicator of fertility levels, on the Krueng Daroy River. This study aims to determine the air quality of Krueng Daroy based on the level of information and to find out information in Krueng Daroy, Aceh Province. This research method is a survey with a purposive sampling technique with quantitative and qualitative approaches. Data collection was conducted for 3 sampling times, with an interval of 3 days for 9 days in 3 research locations with each location consisting of 3 stations. The usability level was analyzed by calculating the Shannon-Wiener Diversity Index, and determining the quality descriptively. The results obtained a plankton diversity index in Krueng Daroy between 2,274 to 2,565 with moderate polluted air quality. The results of the plankton process in the Krueng Daroy River are moderate, with moderate polluted air quality.

Di daerah Tambak Lorok terdapat banyak aktivitas manusia, baik di daratan maupun perairan yang dapat menyebabkan peningkatan konsentrasi logam berat, salah satunya logam Fe. Salah satu organisme yang hidup di Perairan Tambak Lorok dan mampu mengakumulasi logam Fe adalah kerang hijau (Perna viridis). Penelitian ini bertujuan untuk mengetahui kandungan konsentrasi logam berat Fe dalam air, sedimen, dan jaringan lunak daging kerang hijau (P. viridis) serta untuk mengetahui tingkat keamanan konsumsi kerang hijau (P. viridis) harian terhadap logam Fe dari Tambak Lorok, Semarang. Penelitian dilakukan pada bulan Maret dan April 2021 dengan menggunakan metode eksploratif kuantitatif. Kadar logam Fe dianalisis dengan AAS (Atomic Absorption Spectrophotometer). Hasil analisis kandungan logam Fe dalam air berkisar antara 0,16-1,69 mg/L; sedimen 4,39-88,07 mg/kg; dan jaringan lunak kerang hijau (P. viridis) 0,19-2,76 mg/kg. Kandungan logam Fe dalam air menunjukkan peningkatan, sedangkan kandungan Fe dalam sedimen dan jaringan lunak kerang hijau (P. viridis) mengalami penurunan pada bulan April. Nilai BCF (Bioconcentration Factor) < 100 yang menunjukkan akumulasi kerang hijau (P. viridis) terhadap logam Fe rendah. Untuk mengetahui batas aman konsumsi daging kerang hijau per minggu dilakukan penghitungan MTI (Maximum Tolerable Intake). Batas aman konsumsi kerang hijau untuk wanita dengan berat badan 45 kg adalah 657,96 kg/minggu dan 877,28 kg/minggu bagi laki-laki dengan berat badan 60 kg.    Many human activities seen in Tambak Lorok, both on land and in waters, may cause an increase in the concentration of heavy metals, such as Fe. One of the organisms that live in Tambak Lorok Waters and are able to accumulate Fe is the green mussels (Perna viridis). This study aims to determine the concentration of Fe in water, sediment, and soft tissue of green mussel (P. viridis) and to determine the safety level of daily consumption of green mussels (P. viridis) against Fe from Tambak Lorok, Semarang. This study was conducted on March and April 2021 using quantitative exploratory methods. The metal content of Fe was analyzed by AAS (Atomic Absorption Spectrophotometer). Fe content in water ranged from 0.16 to 1.69 mg/L; sediment 4.39-88.07 mg/kg; and soft tissue of green mussels (P. viridis) 0.19-2.76 mg/kg. Fe content in water showed an increase, while the Fe content in sediment and soft tissue of green mussels (P. viridis) decreased in April. The BCF (Bio Concentration Factor) value is < 100, which indicates accumulation of green mussels (P. viridis) against Fe metal is low. To determine the safety limit of green mussel consumption per week, MTI (Maximum Tolerable Intake) was calculated. The safety limit for green mussel consumption for women weighing 45 kg is 657,96 kg/week and 877.28 kg/week for men weighing 60 kg.

This study measured the concentrations of Hg, As, Ni, Cd, and Pb in six fish species commonly consumed in Kendari. Samples were bought within local markets from 2012 to 2017 at the end of the dry season. Results showed that mercury concentrations fluctuated between years and within species, except in the Caranx sexfasciatus, which showed no significant differences (Kruskall–Wallis, p-value > 0.05, df = 5) and an average concentration of 0.371 ± 0.162 µg g−1 DW. Arsenic was found in high concentrations across species and years and varied widely in C. sexfasciatus, the lowest value being 0.32 ± 0.01 µg g−1 DW in 2012 and the highest was 5.63 ± 1.89 µg g−1 DW in 2017. The highest nickel concentrations were found in 2016 across four of the six species. The fish samples displayed very low cadmium and lead concentrations throughout the study. In addition, the potential human health risk due to fish consumption was assessed. This showed that mercury is the only one of the five metals present in concentrations high enough to individually pose a potential hazard, the only metal likely to be accumulated beyond a safe concentration in Kendari. Chanos chanos never posed a toxicological risk based on the results of this research.