Jurnal Ilmiah PLATAX
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Macroalgae Biodiversity in Ondong Coastal Waters.
Get PDFThis research was conducted in the coastal waters of Ondong, West Siau District, Siau Islands Regency Tagulandang Biaro with the aim of knowing the composition of macroalgae taxa through a morphological approach. Data retrieval is done by using the Line Transect quadratic method. The results of the study found 15 species consisting of 3 divisions, 3 classes, 10 orders, 12 families, and 12 genera.AbstrakPenelitian ini dilakukan di perairan pesisir pantai Ondong, Kecamatan Siau Barat, Kabupaten Kepulauan Siau Tagulandang Biaro dengan tujuan untuk mengetahui komposisi taksa makroalga melalui pendekatan morfologi. Pengambilan data dilakukan dengan menggunakan metode Line Transect kuadrat. Hasil penelitian menemukan 15 spesies yang terdiri dari 3 divisi, 3 kelas, 10 ordo, 12 famili, dan 12 genera
Molecular Identification And Conservation Status Of Sharks From The Fins Trade In Manado City North Sulawesi
Get PDFSharks are a group of cartilaginous fish that are vulnerable to overfishing. Genetics approaches play an important role in shark conservation. Shark fishing has become the main activity of fishermen in several areas, including in North Sulawesi. This research is focused on the molecular aspects and conservation status of shark species obtained from the shark fin trade in Manado, North Sulawesi. COI gene was amplified using Fish BCL5 (for) and HCO219 (rev) primers. Nucleotide sequences of each sample were aligned with the closest sequences in the GenBank database using the BLAST (Basic Local Alignment and Search Tool) method. The conservation status of the shark species is carried through the IUCN (International Union for the conservation of nature red list) Red list website. Molecular identification results showed that the shark’s fins from Manado had high similarity with Carcharhinus falciformis (HM1 and HM2) and Carcharhinus melanopterus (HM3). According to IUCN red list data, the C. falciformis and C. melanopterus were categorized as vulnerable to extinction (VU).Keywords: Molekuler; COI; Shark; Manado and IUCN Red list . AbstrakHiu merupakan kelompok ikan bertulang rawan yang sangat rentan terhadap dampak penangkapan secara berlebihan. Informasi terkait genetik hiu yang semakin terancam populasinya sangat berperan penting dalam upaya konservasi hiu. Penangkapan hiu telah menjadi aktivitas utama nelayan di beberapa daerah, termasuk di Sulawesi Utara. Penelitian ini difokuskan pada aspek  molekuler dan penentuan status konservasi spesies hiu menggunakan sampel sirip yang di dapatkan dari perdagangan sirip hiu, di kota Manado. Amplifikasi gen COI dilakukan dengan menggunakan primer Fish BCL5 (for) dan HCO219 (rev). Sekuens nukleotida masing-masing sampel disejajarkan dengan nukleotida terdekat yang ada dalam database genbank menggunakan metode BLAST (Basic Local Aligment and Search Tool) Penentuan status konservasi dilakukan melalui penelusuran spesies rujukan di situs IUCN (International Union for the Conservation of Nature) Red list. Hasil identifikasi molekuler menunjukan bahwa sampel sirip hiu dari  kota Manado  memiliki kemiripan yang tinggi dengan spesies : Carcharhinus falciformis  (HM1 dan HM2) dan C. melanopterus (HM3).  Menurut data IUCN Red list, C. falciformis dan C. Melanopterus merupakan jenis hiu dalam status konservasi rentan punah (VU). Kata Kunci: Molekuler; COI; hiu; Manado dan IUCN Red lis
Histological Observation Of Milkfish Organs With Stunting Phenomenon
Get PDFMilkfish (Chanos chanos) is an important economic fish. Milkfish is widely consumed because it has high nutritional value. Milkfish is also used as live bait for fishing. In the milkfish cultivation system, increasing production is a very important factor. One of the efforts to increase production in fish farming systems is the application of high stocking density. Constraints to the application of the high stocking density cause the growth of milkfish to be non-uniform, some of them even experience stunting, which is a condition in which the fish experience slow growth. This study aims to observe the condition of the milkfish tissue with normal growth and stunted fish. Milkfish (Chanos chanos) used are fish that have been reared for 6 months. Fish organs that were sampled for observation were stunted and normal (non-stunting) fish. The organs observed were the gills, muscles, and intestines. The results showed that stunted milkfish (Chanos chanos) affected the condition of the gill tissue, muscles, and intestines. The gills are edema and necrosis. Muscles undergo edema, degeneration of muscle fibers, and necrosis. The intestine experiences necrosis or cell death.Keywords: Milkfish; Stunting; Histology.AbstrakIkan Bandeng (Chanos chanos) merupakan ikan bernilai ekonomis penting. Ikan Bandeng banyak dikonsumsi karena mempunyai nilai gizi yang tinggi. Ikan bandeng juga dimanfaatkan sebagai umpan hidup untuk penangkapan ikan. Pada sistem budidaya ikan Bandeng peningkatan produksi menjadi faktor yang sangat penting. Salah satu upaya peningkatan produksi pada sistem budidaya ikan adalah dengan aplikasi padat tebar yang tinggi. Kendala penerapan padat penebaran yang tinggi menyebabkan pertumbuhan ikan Bandeng tidak seragam, bahkan beberapa diantaranya mengalami stunting yang merupakan suatu kondisi dimana ikan mengalami lambatnya pertumbuhan. Penelitian ini, bertujuan untuk mengamati kondisi jaringan ikan bandeng dengan pertumbuhan normal dan ikan yang mengalami stunting. Ikan Bandeng (Chanos chanos) yang digunakan adalah ikan yang telah dipelihara selama 6 bulan. Organ ikan yang menjadi sampel pengamatan adalah ikan yang mengalami stunting dan normal (non-stunting). Organ yang diamati adalah insang, otot, dan usus. Hasil penelitian menunjukan ikan Bandeng (Chanos chanos) yang mengalami stunting mempengaruhi kondisi jaringan insang, otot dan usus. Insang mengalami edema dan necrosis. Otot mengamali edema, degenerasi serabut otot, dan necrosis. Usus mengalami necrosis atau kematian sel.Kata kunci: Ikan Bandeng, Stunting, Histolog
Species of Fish in rivers in the Northern Peninsula of Sulawesi Island
Get PDFThis study aims to determine the species of fish found in the Poigar River, Ranoyapo River, Maruasey River, Talawaan River, and Likupang River in the northern peninsula of Sulawesi Island. These five rivers empty into the Sulawesi Sea. Sampling was carried out in the upstream, middle and downstream parts of the river, all sampling areas were freshwater areas, estuary areas with brackish water types were not included in this study. Sampling was carried out using cast nets and electric shocks. There are 58 species (16 orders, 21 families, 40 genera). Families Gobidae (9 genera, 19 species) and Eleotridae (8 genera 13 species), 19 other families have only 3 or 2 or 1 species. There are 28 species of Ranoyapo River, 25 species of Maruasey River, 23 species of Poigar River, 15 species of Likupang River, and 9 species of Talawaan River. Eel Anguilla marmorata widely distributed in five rivers, and Eleotris melanosoma (Eleotridae) Osteochilus hasseltii (Cyprinidae) in four rivers. The other species are only found in 3, 2, and 1 rivers. There are 27 species found in only one river.Keywords: Freshwater; River; Species; Fish.AbstrakPenelitian ini bertujuan untuk mengetahui spesies ikan yang terdapat di Sungai Poigar, Sungai Ranoyapo, Sungai Maruasey, Sungai Talawaan dan Sungai Likupang di semenanjung utara Pulau Sulawesi. Lima sungai ini bermuara di Laut Sulawesi. Pengambilan sampel dilakukan pada bagian hulu, tengah dan bagian hilir sungai, seluruh wilayah pengambilan sampel adalah wilayah air tawar, daerah muara dengan tipe air payau tidak termasuk dalam penelitian ini. Pengambilan sampel dilakukan dengan menggunakan jaring lempar dan kejutan listrik. Terdapat 58 spesies (16 ordo, 21 famili, 40 genus). Famili Gobidae (9 genus, 19 spesiies) dan Eleotridae (8 genus 13 spesies), 19 Famili yang lain hanya memiliki 3 atau 2 atau 1 spesies. Sungai Ranoyapo terdapat 28 spesies, Sungai Maruasey 25 spesies, Sungai Poigar 23 spesies, Sungai Likupang 15 spesies dan Sungai Talawaan 9 spesies. Ikan sidat Anguilla marmorata menyebar luas pada lima sungai, dan Eleotris melanosoma (Eleotridae) Osteochilus hasseltii (Cyprinidae) pada empat sungai. Spesies yang lain hanya ditemukan pada 3, 2 dan 1 sungai. Terdapat 27 spesies yang ditemukan hanya pada satu sungai.Keywords: Freshwater; River; Species; Fish
Persentage of Coral Cover and Megabenthos Diversity in “Tanjung Jahaâ€, Tanjung Pulisan Waters, North Minahasa Regency
Get PDFTanjung Pulisan waters, especially the “Tanjung Jaha†are one of the diving tourism areas and have been designated as part of Likupang Special Economic Zone (SEZ), which has also been included in one of five super-priority tourist destinations in Indonesia. Based on the assumptions that tourism activities in the area would be very massive, it is presumed that the “Pantai Kecil†area will be affected by those activities. Therefore, this study aims to provide data on coral cover and megabenthic diversity, as a basis data for further research and or for policy decisions in the region. This study used the Benthos Belt Transect (BBT) method and the Underwater Photo Transect (UPT) method and they were analyzed with CPCE (Coral Point Count with Excel Extensions) and Microsoft Excel. The results showed that the percentage of coral cover in “Tanjung Jaha†was categorized as “Good†with a value of 55.92% which included 41.36% hard corals and 15.31% soft corals. At this location, 26 megabenthos were found which consisted of 5 different taxa and the diversity index was categorized as “Medium†with the value of H’=1.36.Keywords:    Coral Cover; Diversity; Pantai Kecil; Tanjung PulisanAbstrakPerairan Tanjung Pulisan, khususnya “Tanjung Jaha†merupakan salah satu daerah wisata penyelaman dan telah ditetapkan menjadi bagian dari Kawasan Ekonomi Khusus (KEK) Likupang dan juga masuk dalam salah satu dari lima destinasi wisata super prioritas di Indonesia. Dengan aktivitas pariwisata yang akan sangat masif, diperkirakan wilayah “Tanjung Jaha†akan terdampak oleh aktivitas pariwisata. Maka dari itu penelitian ini bertujuan untuk menyediakan data tutupan karang dan keanekaragaman megabentos, sebagai data awal sebagai informasi bagi riset selanjutnya maupun pada kebijakan yang akan berlaku di daerah tersebut. Penelitian ini menggunakan metode Benthos Belt Transect (BBT) dan metode Underwater Photo Transect (UPT) dengan analisa menggunakan CPCe (Coral Point Count with Excel extensions) dan Microsoft Excel. Hasil analisis menunjukan persentase tutupan karang di “Tanjung Jaha†terkategorikan “Baik†dengan nilai 55.92% yang terdiri dari 41.36% karang keras dan 15.31% karang lunak. Di lokasi ini ditemukan 26 megabentos dari 5 taksa berbeda dengan indeks keanekaragaman terkategorikan “Sedang†dengan nilai H’=1.36.Kata kunci: Keanekaragaman; Pantai Kecil; Tutupan Karang; Tanjung Pulisa
Lactococcus garvieae Isolates from Rainbow Trout (Oncorhynchus mykiss, W.) Compared by PLG and SA1B10 PCR Primer Pairs
Get PDFThe aim of this study was to identify and compare Lactococcus garvieae strains using the PLG primer pair and SA1B10 primer pair. Also, the antibiotic resistance of the strains was investigated in the study. For this aim, commercial trout farms at Kemer, Korkuteli, and Manavgat, Antalya Province, Turkey were visited every month from June to September 2018. Thirty sick fish were sampled in the study. Lethargy, anorexia, darkening of skin color, unilateral or bilateral exophthalmos, opacification and hemorrhages in the eyes of the sick fish, and abdominal dropsy were observed. At necropsy, hemorrhages in the internal organs, splenomegaly, and darkening of the spleen and ascites were present. Seventy-five strains from sick fish samples verified on the basis of the biochemical characterization and PCR studies. The strains showed homogeneity in terms of phenotypic characteristics and all strains were identified as Lactococcus garvieae. The PCR technique was applied to 50 of 75 strains using PLG primer pair. While 47 of 50 strains gave positive results, amplification was not observed in 3 strains. When the PCR technique using SA1B10 primer pair was applied to a total of 25 strains, 3 of which were negative, 22 of which gave positive amplification, and 25 strains gave positive results. Resistance was determined by the disk diffusion method. All seventy-five strains were resistant to ampicillin and all strains were susceptible to bacitracin and tetracycline. It was found that the resistance and susceptibility of the strains showed variation to other antibiotics used in the study.Keywords: Lactococcus garvieae; Rainbow Trout; PCR; Antibioti
Community Structure of Zooplankton in the waters of Kampung Ambong Likupang, North Minahasa
Get PDFZooplankton has an important role as a linking chain between primary producers and biota at higher trophic levels. This organism is a component in the food chain that has a dual role as both the first consumer and the second consumer. They are intermediaries between plankton and nekton groups. This research was conducted at the field station of Fisheries and Marine Sciences Faculty of Sam Ratulangi University, which is located in Kampung Ambong, Likupang, North Minahasa Regency, to identify the species and to determine the structure of the Zooplankton community through: Density, Relative Density, Diversity (H '), Dominance (e ), and Uniformity (C). Based on the results of species identification, 20 species from 15 genera in 3 classes were obtained, namely Hexanauplia (13 genus 18 species), Crustacea (1 genus 1 species), and Malacostraca (1 genus 1 species). The results of the community structure analysis obtained moderate uniformity values at points 1, 2, and 3. The dominance index shows low values at all three points, where point 2 C = 0.17 and at points 1 and 3 C = 0.20 This means that there is no types of plankton that dominate the area. Temperature 28 ° C, Salinity 300/00, and pH = 7 indicate conditions that are still in a good range as a place to live and grow Zooplankton.Keywords: Zooplankton; Diversity; Community Structure; LikupangAbstrakZooplankton mempunyai peran penting sebagai rantai penghubung produser primer dengan biota pada tingkat trofik yang lebih tinggi, juga merupakan salah satu komponen dalam rantai makanan yang berperan ganda baik sebagai konsumen tingkat pertama maupun konsumen tingkat ke dua, selanjutnya merupakan penghubung antara plankton dan nekton. Penelitian ini dilakukan di Laboratorium Basah Fakultas Perikanan dan Ilmu Kelautan Universitas Sam Ratulangi, Kampung Ambong, Likupang, Kabupaten Minahasa Utara, untuk mengetahui jenis dan struktur komunitas Zooplankton melalui: Kepadatan, Kepadatan Relatif, Keanekaragaman (H’), Dominansi (e), dan Keseragaman (C). Berdasarkan hasil Identifikasi jenis, diperoleh 20 spesies dari 15 genus dalam 3 klas, yaitu Hexanauplia (13 genus 18 spesies), Crustacea (1 genus 1 spesies), dan Malacostraca (1 genus 1 spesies). Hasil analisis struktur komunitas diperoleh nilai keseragaman yang sedang pada titik 1, 2, dan 3. Indeks Dominansi menunjukkan nilai yang rendah pada ketiga titik, dimana titik 2 C = 0,17 dan pada titik 1 dan 3 C = 0,20 Artinya tidak terdapat jenis plankton yang mendominsi daerah tersebut. Suhu 28°C, Salinitas 300/00, dan pH= 7 menunjukkan kondisi yang masih dalam kisaran baik sebagai tempat hidup dan bertumbuhnya Zooplankton.Kata kunci: Zooplankton; Keanekaragaman; Struktur Komunitas; Likupan
Rekruitment Tropical Box Mussels, Septifer Bilocularis In Tiwoho Coastal Area
Get PDFThe purpose of this study was to determine 1) the types of substrates on which Septiver attached, and 2) the number of tropical boxes mussel recruits at different size aggregation. The meter was placed on one side of the mussel aggregation, and it was pulled up to the other side through the middle of the mussel aggregation. There were two different sizes of aggregation, namely small aggregation with a diameter of 5-25 cm, and large aggregation with a diameter > 1 meter. Aggregation samples were carried out by placing a core with a diameter of 10 cm in the center of the small mussel aggregation, then at the edge and the middle position of the large aggregation. All aggregation in the core was removed and inserted into the labeled sample plastic. The sampling was applied 4 times on different mussel aggregations, as replication. The results show that young mussels (recruiters) are attached to algae stems, mussel byssus, and dead hard coral. The number of mussel recruits was square-root transformed to obtain homogeneity data, before being tested using One-Way Analysis of Variance. The results showed that the recruitment of Septifer was influenced by the size of the aggregation (P<0.05, 1-way ANOVA). The average recruitment of Septiver in the middle position has a higher number of recruits than to the edge position (SNK test, P < 0.05), as well as the average recruitment in the middle position was higher than to the small aggregations (SNK-Test, P < 0.05). However, no recruits differ among edge position of large aggregation and small aggregation occurs (SNK test, P > 0.05). Discussion of different factors affecting attachment occurs.Keywords: box mussel; Septifer; recruit; aggregation; larva; TiwohoAbstrakTujuan penelitian ini adalah untuk mengetahui 1) jenis-jenis substrat yang menjadi tempat menempel kerang mudah Septiver, dan 2) jumlah rekruit kerang kotak tropis pada ukuran aggregasi kerang yang berbeda. Pengukuran ukuran aggregasi kerang dilakukan dengan meletakkan meteran pada salah satu sisi aggregasi kerang, selanjutnya meteran ditarik sampai ke sisi yang lain melewati bagian tengah aggregasi kerang. Ada 2 jenis ukuran aggregasi, yaitu aggregasi kecil dengan ukuran diameter aggregasi 5 – 25 cm, dan aggregasi besar, yaitu dengan ukuran diameter aggregasi kerang > 1 meter.  Pengukuran diameter aggregasi dilakukan 4 kali, masing-masing dengan aggregasi berbeda, sebagai ulangan. Sampel aggregasi kerang dilakukan dengan meletakkan kor (‘cor’) dengan diameter 10 cm di bagian tengah pada aggregasi kerang kecil, posisi pinggir dan tengah aggregasi besar. Sampel diambil juga sebanyak 4 kali (ulangan) pada masing aggregasi yang berbeda, sebagai ulangan. Kerang disortir dengan bantuan mikroskop, di mana kerang dengan ukuran < 3 mm adalah yang disebut sebagai rekruitmen, dipisahkan dari substrat yang menjadi tempat menempel, selanjutnya kerang diukur panjangnya dengan menggunakan mistar, dengan ketelitian 1 mm. Hasil penelitian teridentifikasi bahwa kerang muda menempel pada substrat alga, rambut (byssus), dan substrat keras karang mati. Data jumlah rerkuit telah ditransform dengan menggunakan akar, sebelum diuji dengan Analisa Varians 1 Arah (One-Way ANOVA). Hasil menunjukkan bahwa rekruit kerang Septifer adalah dipengaruhi oleh ukuran aggregasi (P<0.05, 1 Arah ANOVA). Rata-rata rekruit kerang yang berada di posisi tengah memiliki jumlah rekruit yang lebih besar dibandingkan dengan rata-rata rekruit yang menempel pada posisi pinggir (Uji SNK, P < 0.05). Sama halnya dengan rata rekruit yang ada di posisi tengah aggregasi besar adalah lebih besar dibandingkan dengan jumlah rekruit dari aggregasi kecil (Uji-SNK, P < 0.05). Hal yang berbeda, di mana tidak ada perbedaan rata-rata rekruit yang ada di posisi pinggir aggregasi besar dibandingkan dengan yang ada di aggregasi kecil (uji SNK, P>0.05). Faktor yang mempengaruhi penempelan dan rekruit dari agrregasi dengan ukuran berbeda didiskusikan.Kata kunci: Kerang Kotak; Septifer; recruit; aggregate; larva; Tiwoh
Gastropod Community Structure in Seagrass Ecosystems in North Minahasa Ganges Waters
Get PDFThe purpose of this study was to determine the types of gastropods in the seagrass ecosystem in the waters of Gangga I Village, North Minahasa Regency through Species Density, Relative Density, Diversity and Dominance in the waters of Gangga I Village, North Minahasa Regency. The results of the study obtained 126 individuals consisting of 13 species (7 genera) from 7 families (3 orders). The results of the analysis of the gastropod community structure showed that the highest species density value was at point 1 of 1.67 ind/m², followed by point 2 of 1.43 ind/m² and the lowest was at point 3 of 1.20 ind/m². The low density of gastropods at the 3 points is assumed to be caused by the environmental conditions in which they live, food sources, and fishing activities carried out by the local community. The relative density value of species with the highest percentage is at point 3, namely, the species Nassarius albescens 0.167% and the species with the lowest percentage is at point 1, namely the species Xenoturris millepunctata 0.020%. The diversity index value which includes the high criteria is at point 1 of 3.25, while the diversity value which includes the medium criteria is at point 2 of 2.87 and point 3 of 2.42. The dominance value obtained from the analysis ranges from C = 0.09 to 0.12 which is classified as low. while the value of diversity which includes the medium criteria is at point 2 of 2.87 and point 3 of 2.42. The dominance value obtained from the analysis ranges from C = 0.09 to 0.12 which is classified as low. while the value of diversity which includes the medium criteria is at point 2 of 2.87 and point 3 of 2.42. The dominance value obtained from the analysis ranges from C = 0.09 to 0.12 which is classified as low.Keywords; Density; Diversity; Dominance; Environmental. AbstrakTujuan dari penelitian ini adalah untuk mengetahui jenis-jenis Gastropda di Ekosistem lamun perairan desa Gangga I, Kabupaten Minahasa Utara melalui: Kepadatan Spesies, Kepadatan Relatif, Keanekaragaman dan Dominansi di perairan Desa Gangga I Kabupaten Minahasa Utara. Dari hasil penelitian, diperoleh 126 individu yang terdiri atas 13 spesies (7 genera) dari 7 famili (3 ordo). Hasil analisis struktur komunitas gastropoda diperoleh nilai kepadatan spesies tertinggi pada titik 1 sebesar 1,67 ind/m², diikuti titik 2 sebesar 1,43 ind/m² dan yang terendah ada pada titik 3 sebesar 1,20 ind/m². Rendahnya kepadatan gastropoda pada ke 3 titik diasumsikan disebabkan oleh kondisi lingkungan tempat hidupnya, sumber makanan dan aktivitas perikanan yang dilakukan masyarakat setempat. Adapun Nilai kepadatan relatif jenis dengan persentase tertinggi ada pada titik 3, yaitu spesies Nassarius albescens 0,167% dan spesies dengan persentase terendah ada pada titik 1, yaitu spesies Xenoturris millepunctata 0,020%. Nilai indeks keanekaragaman yang termasuk kriteria tinggi terdapat pada titik 1 sebesar 3,25, sedangkan nilai keanekaragaman yang termasuk kriteria sedang terdapat pada titik 2 sebesar 2,87 dan titik 3 sebesar 2,42. Nilai dominansi yang diperoleh dari analisis berkisar C = 0,09 sampai dengan 0,12 yang tergolong rendah.Kata kunci; Kepadatan; Keanekaragaman; Dominansi; Lingkunga
Sediment Granulometry of the Beach at the Kalasey’s Groynes
Get PDFCoastal areas have the potential to be developed and utilized for various purposes. However, the intensity of coastal use can result in the degradation of the coastal environment. Therefore, management of the coastal areas is often carried out by building shore protective structures, including groynes. The placement of a structure in the form of a groynes is primarily intended to block littoral flow in moving sediment out of certain places in the shore. Therefore, the placement of groynes on the shore needs to be followed by a study to find out the effectiveness of the groynes. The effectiveness of groynes can be determined, among others, by a study on the granulometry of sediments on the beach. This study was conducted to describe the composition of the sediment and to analyze granulometry distribution in several places at the beach around the groynes on the shore of Kalasey. The study of the physical sediments around the Kalasey groynes was carried out through a study of the sediment samples from October 30, 2020, to April 27, 2021. Sediment sampling was carried out at 6 stations which have been determined on the surface of the beach formed around the groynes. The results obtained through this research showed that the composition of the sediments in the beach around the Kalasey groynes consisted of size classes as follows: very fine sand, fine sand, medium sand, coarse sand, very coarse sand, granule, and pebble. Fine-sized materials at the beach which is located in the groynes on further east have increased in composition. Based on the granulometric analysis of the sediment, it is indicated that the erosion and deposition processes occur alternately in the beaches formed around the groynes.Keywords: Beach; Kalasey Groynes; Sediment Composition; Granulometric AnalysisAbstrakWilayah pantai memiliki potensi untuk dikembangkan dan dimanfaatkan untuk berbagai kepentingan. Walaupun demikian, intensivitas pemanfaatan pantai dapat mengakibatkan terjadinya degradasi lingkungan pantai. Oleh karena itu, dalam rangka pengelolaan pantai seringkali dilakukan dengan cara membangun struktur pelindung pantai, diantaranya berupa groin. Penempatan struktur berupa groin di kawasan pantai, dimaksudkan utamanya untuk menghadang aliran litoral dalam memindahkan sedimen keluar dari tempat tertentu di kawasan pantai. Oleh karena itu, penempatan groin di pantai perlu diikuti dengan kajian untuk melihat efektivitas fungsi groin pada kawasan pantai tersebut. Salah satu cara untuk melihat efektivitas kerja groin di pantai adalah melalui kajian menyangkut granulometri sedimen gisik yang terhampar di sekitar groin yang ditempatkan. Penelitian ini dilakukan dengan tujuan mendeskripsikan komposisi sedimen dan menganalisis distribusi granulometri di beberapa tempat pada gisik sekitar groin di pantai Kalasey. Kajian terhadap sedimen gisik sekitar groin Kalasey dilakukan melalui telaah terhadap sampel sedimen yang dicuplik mulai 30 Oktober 2020 sampai dengan 27 April 2021. Pencuplikan sedimen dilaksanakan di 6 stasiun yang ditetapkan pada permukaan gisik yang terbentuk di sekitar groin Kalasey. Hasil yang diperoleh melalui penelitian ini adalah komposisi sedimen pada gisik di sekitar groin Kalasey terdiri dari kelas ukuran berupa pasir sangat halus, pasir halus, pasir sedang, pasir kasar, pasir sangat kasar, granul, dan kerakal. Gisik yang terletak pada kawasan groin semakin ke arah Timur pada kawasan ini, komposisi sedimennya mengalami peningkatan jumlah material sedimen yang berukuran halus. Berdasarkan analisis granulometri sedimen terindikasi bahwa proses erosi dan deposisi terjadi secara bergantian pada gisik-gisik yang terbentuk di sekitar groin.Kata kunci: Gisik; Groin Kalasey; Komposisi Sedimen; Analisis Granulometr