The purpose of this study is to analyze the conflict in Bengkalis waters and contributing factors. Analysis of the conflict is descriptive and the factors that cause conflict with the approach of analyzed Fisher et al. (2000). The study was conducted in the waters Bengkalis Regency. The results showed that the conflict in Bengkalis waters began in 1983 to the present. This conflict started when hunting for kurau (Eleutheronema tetradactylum) in the waters of District Bantan began to rise. Primary factors driving the conflict has not received much attention and as basis for conflict resolution that remains in progress. These factors are identified into three parts: 1) cultural background, 2) social factors, and 3) juridical factor.

Pola pertumbuhan ikan yang ditentukan melalui hubungan panjang-bobotnya merupakan suatu pendekatan yang banyak diterapkan dalam pengelolaan perikanan dan dapat digunakan dalam menentukan kondisi ikan. Hubungan panjang-bobot dan faktor kondisi ikan selangat dianalisis dari ikan contoh yang dikumpulkan dari nelayan pada Juni hingga Agustus 2022 di Pantai Senggarang, Tanjungpinang. Penelitian bertujuan untuk menentukan pola pertumbuhan dan faktor kondisi ikan selangat. Sebanyak 422 ekor ikan contoh diukur panjang baku (mm) dan ditimbang bobotnya (g). Hasil penelitian menunujukkan bahwa nilai b sebesar 3,04 yang mengindikasikan pola pertumbuhannya isometrik. Nilai faktor kondisi berkisar pada 0,84 hingga 1,04. Pola pertumbuhan dan faktor kondisi tidak konstan, bervariasi musiman, berkait dengan banyak faktor seperti siklus reproduksi, ketersediaan makanan, dan faktor lingkungan dan habitatnya.

Mapping can be used as an alternative solution to find out the distribution map of the mangrove ecosystem by utilizing remote sensing technology and can provide value to the mangrove ecosystem. The purpose of this study was to map the distribution of mangrove ecosystems on Mapur Island. Sentinel-2b image is one of the satellite imageries had performance used to analyze the distribution of mangrove ecosystems. The mapping of the distribution of mangroves on Mapur Island shows that the mangrove ecosystem is distributed from the east to the northwest of Mapur Island. The northern part of Mapur Island has a sandy substrate classification that does not allow the growth of mangroves in the area. The distribution of mangrove classification results using Sentinel Citra-2b has a high pixel value classified of 88%, the comparison the accuracy of in situ data classification of 80%. The largest mangrove density is on Mapur Island, with a value of density of 156,729 ha. Pemetaan dapat dijadikan salah satu solusi alternatif untuk mengetahui peta sebaran luasan ekosistem mangrove dengan memanfaatkan teknologi penginderaan jauh dan dapat memberikan nilai luasan ekosistem mangrove. Tujuan dari penelitian ini adalah melakukan pemetaan sebaran luasan ekosistem mangrove di Pulau Mapur. Citra Sentinel-2b merupakan salah satu citra yang dapat digunakan untuk menganalisis sebaran luasan ekosistem mangrove. Hasil dari pemetaan sebaran mangrove di Pulau Mapur dapat dilihat bahwa ekosistem mangrove tersebar di bagian timur hingga barat laut Pulau Mapur. Bagian utara Pulau Mapur mempunyai tipe substrat yang berpasir sehingga tidak memungkinkan tumbuhan mangrove dapat tumbuh di daerah tersebut. Sebaran mangrove hasil klasifikasi dengan menggunakan Citra Sentinel-2b memiliki nilai piksel terklasifikasi hamper sempurna adalah 88%, sedangkan akurasi klasifikasi terhadap lapangan 80%. Kerapatan mangrove di Pulau Mapur yang paling luas dengan tingkat kerapatan padat dengan luas 156.729 ha.

Kepiting soka adalah kepiting bakau yang dibudidayakan dan dilakukan pemanen disaat molting sehingga cangkangnya menjadi lunak dan mudah untuk dikonsumsi. Tujuan dari pengabdian ini adalah untuk meningkatkan pendapatan masyarakat Desa Pulau Cawan, Kecamatan Mandah, Kabupaten Indragiri Hilir melalui budidaya kepiting soka dengan memperkenalkan teknik budidaya yang ramah lingkungan, namun dapat menghasilkan nilai tambah dari segi peningkatan ekonomi keluarga melalui budidaya kepiting soka. Pelatihan teknik-teknik budidaya kepiting soka dan pelatihan pembangunan konstruksi wahana budidaya (crabs box). Kegiatan pengabdian ini dilaksanakan dengan menggunakan beberapa metoda pendekatan yaitu memberikan pemahaman kepada masyarakat yang dilaksanakan dalam bentuk FGD (Focus Group Discussion). Serta melakukan diskusi dan praktek budidaya kepiting untuk menggali informasi tentang pemahaman budidaya yang ramah lingkungan, menjaga ekosistem mangrove, peningkatan pendapatan rumah tangga melalui penambahan nilai terhadap hasil tangkapan dan solusi mengenai adanya nelayan dari luar desa yang melakukan cara-cara penangkapan yang merusak, yaitu dengan memberi racun. Serangkaian kegiatan penyuluhan yang dilakukan mengenai teknik budidaya kepiting cangkang lunak (soka) dapat diterima dengan baik oleh nelayan penangkap kepiting yang ada di Desa Pulau Cawan. Peningkatan pengetahuan dan keterampilan nelayan penangkap kepiting dalam budidaya kepiting cangkang lunak yang di letakkan dalam kotak kepiting (crab box) dapat menjadi bekal agar kegiatan budidaya ini dapat terus berlanjut, dan Desa Pulau Cawan dapat menjadi desa percontohan teknik budidaya kepiting cangkang lunak (soka) untuk beberapa tahun ke depan.

Turmeric is commonly used as stimulant and it is an important ingredient in tradisional herbal medication. A study aims to understand the blood condition of Pangasius hypophthalmus fed on turmeric enriched pellets and were infected with Aeromonas hydrophila has been conducted from August to October 2018. There were 3 treatments applied; namely P1: Fishes were fed with turmeric enriched pellets of 0.5 g/Kg feed, P2 (0.7 g/Kg feed) and P3 (0.9 g/Kg feed). The negative control (Pn) were the fish that was not receive any treatment, while the positive control (Pp) was the fish that was infected with A. hydrophila, and was not given turmeric powder. Fourteen days after being fed on turmeric enriched pellets, the fishes were infected with Aeromonas hydrophila (0.1 ml of 108 of A. hydrophila culture). Totally 15 fishes from each treatments were studied. Blood were taken from vena caudalis using 1 ml syringe wet with 10% EDTA and then were checked using binocular microscope for erythrocyte and leucocyte number. Haematocrite and leukocrite levels and types of leucocyte were also studied. Results shown that the blood condition of turmeric treated fishes were different. The total erythrocyte of the negative control (Pn) fishes was 2.136.670 cells/mm3, the positive control (Pp) was 1.423.300 cells/mm3 and that of the treated fishes ranged from 1.520.000 to 2.886.700 cells/mm3. While the number of the leucocytes of the negative control fishes was 153.200 cells/mm3, the postive control (Pp) showing infectious condition with 726.000 leucocyte cells/mm3. The leucocyte number of the turmeric treated fishes (P1, P2 and P3) showing normal values, ranged from 107.000 to 2.069.000 cells/mm3. Based on data obtained, it can be concluded that the turmeric enriched pellets improved the ability of the fish to cope the problems caused by A. hydrophila infection

A study on the histological structure of kedney of Pangasius hypopthalmus that were fed with turmeric supplementation and were infected with Aeromonas hydrophila has been conducted in the Laboratory of Parasites and Fish Disease, the Fishery and Marine Science Faculty, Riau University from February to July 2019. There were 3 treatments applied. The first group (P1) was given diet supplemented by 0.5g of turmeric powder. The second group (P2) was given diet supplemented by 0.7g of turmeric powder. The third group (P3) was given diet supplemented of 0.9g of turmeric powder. After 14 days, the fishes were infected with Aeromonas hydrophila (0.1 ml of 109 of A. hydrophila culture). The negative control were fishes that were not receive any treatment, while the positive control were fishes that were infected with A. hydrophila, and were not given diet any supplementation of turmeric powder. Fishes were reared for 14 days and than kedney organ were obtained for histological study. Tissue sample were processed by standard histological method (formalin fixed, alcohol series, HE stained and 6 sliced). The result indicated that there were differences in the tissue of treated fishes and that of the control. Kidney tissue of the positive control shown badly damage, there were many necrotic spots, congestion, hyperplasia, hypertropy and haemorrhage. Kedney tissue of the treated fishes of P2 (0.7g of turmeric extract) shown less abnormalities such as necrotic spots and haemorrhage. It can be concluded that the turmeric supplementation in Fish feeding is able to cure A. hydrophila infection on fish.

No abstract

In river mouths and coastal areas, sediment carried by water flows often clogs the estuaries and causes silting lagoons, impacting the prevalence of coral disease. Ten sediment traps were installed in the river 25 cm from the bottom to record the data for 21 days in Kawal River. Oceanographic and current flow data were collected using CTD and a Current meter using the Eulerian method with a depth interval installation of 0.25 to 0.75 from the river surface. The Underwater Photo Transect (UPT) is a method to analyze the condition of coral reefs and coral disease. CTD the temperature data ranged from 30.471 ± 0.001 °C to 31,609. ±0.001°C, salinity value ranges from 29.643 ± 0.001 PSU to 32.336 ± 0.001 PSU and current flow ranged from 0.063 ± 0.010 m/s to 0.281 ± 0.012 m/s. The results of the sediment trap, the dry weight value of sediment deposited in the sediment traps ranges from 0.89 grams, and for the largest of 48.45 grams, the turbidity ranged from 0.77 NTU to 4.22 NTU. The prevalence of coral disease was 56.40%. The conclusion indicates that excessive sedimentation rates at river mouths can result in a high incidence of coral disease.