22 research outputs found
Spatio-Temporal Variability of Sea Surface Temperature, Salinity, and Chlorophyll-a on Large Pelagic Fish Catch in West Sumatra Waters
No full textThe Fisheries Management Area of the Republic of Indonesia (FMA) 572, particularly the waters of West Sumatra, has significant potential for the capture of large pelagic fish such as tuna, skipjack, and mackerel. However, this potential has not been fully utilized by local fishermen, likely due to limited knowledge of potential fishing grounds. This study aims to map and identify potential fishing areas in FMA 572 using oceanographic parameters, including Sea Surface Temperature (SST), Chlorophyll-a, and Salinity. The research employed a survey method using secondary data. Oceanographic data were obtained from the Copernicus Marine Service website (https://data.marine.copernicus.eu), while fishing logbook data were collected from the Bungus Oceanic Fishing Port (PPS Bungus). Multiple regression and correlation analyses were used to examine the relationship between oceanographic variables and fish catch data.The results indicate that areas with SST ranging from 28–30°C, chlorophyll-a concentrations between 0.3–2.5 mg/m³, and salinity levels of 30–34 ppt are the most potential zones for fishing activities. The regression analysis revealed a strong relationship between oceanographic parameters and fish catch, with a coefficient of determination (R²) of 99.69%. Salinity showed the strongest correlation (r = 0.963), followed by SST (r = 0.998) and chlorophyll-a (r = 0.993). These findings highlight that oceanographic conditions play a vital role in determining the distribution and abundance of large pelagic fish. Therefore, integrating oceanographic data into fishing practices can improve fishing efficiency and support sustainable fisheries management in the waters of West Sumatra
Pengaruh Variasi Suhu Permukaan Laut terhadap Kelimpahan Ikan Cakalang (Katsuwonus pelamis) di Perairan Padang melalui Pemanfaatan Satelit Landsat 9
No full textSuhu Permukaan Laut (SPL) sangat berpengaruh terhadap metabolisme ikan secara biologis. Penelitian ini bertujuan untuk mengetahui pengaruh suhu permukaan laut terhadap potensi kelimpahan ikan cakalang, memetakan sebaran suhu permukaan laut di Perairan Padang menggunakan Satelit Landsat 9 Oli dan mengetahui hubungan suhu permukaan laut terhadap potensi kelimpahan ikan cakalang. Penelitian ini dilaksanakan di (PPS) Bungus Sumatera Barat tanggal 1 Mei - 20 Mei 2023. Materi yang digunakan dalam penelitian ini yaitu berupa data data logbook penangkapan dan data suhu permukaan laut. Metode yang digunakan yaitu analisis secara deskriptif dan analisis regresi linier sederhana. Hasil penelitian menunjukan tangkapan tertinggi terjadi pada Musim Peralihan I dengan sebaran SPL sebesar 32.13℃ dengan kecepatan angin sebesar 1.25 m/s dan kecepatan arus sebesar 0.3 m/s. Kemudian untuk hasil tangkapan terendah terjadi pada musim Timur dan Peralihan II dengan sebaran SPL sebesar 28.29 dan 25.01 ℃ dengan kecepatan angin sebesar 1.85 dan 1.21 m/s dan kecepatan arus sebesar 0.15 m/s dan 0.25 m/s. Hasil Analisis menunjukan bahwa suhu permukaan laut tidak berpengaruh secara signifikan terhadap kelimpahan ikan cakalang.
ASSESSMENT OF THREE-DIMENSIONAL BAROCLINIC CIRCULATION MODEL FOR THE MUSI COASTAL AREA
No full textThe hydrodynamics of the Musi estuary ecosystem is influenced by the flow of water discharge from the river, tidal circulation within the estuary, and complex bathymetry. Numerical modeling is one of the best ways to explain the characteristics and processes occurring in the estuary. However, the obtained model requires validation to ensure its accuracy despite the complexity added by variability in tidal and bathymetric conditions, making the validation process more challenging. This difficulty can be overcome by using high-resolution data, which provides a refined understanding of the river-to-sea estuary flow and its variability. The validation process involves the use of conductivity-temperature-depth (CTD) instruments and mooring tidal stations. The validated model is considered capable of accurately simulating tidal propagation as it represents the temperature-salinity-density properties within the estuarine environment. The development of this model demonstrates the effective implementation of these parameters within the Musi estuary ecosystem domain. The 3D model simulation is used to consider the vertical discretization in the river-estuary-sea channel, which enhances the representation of temperature-salinity-density in the water column. The obtained results suggest that the 3D-MIKE modeling is well-suited for operational purposes, including the prediction of hydrodynamics and the management of estuarine areas, specifically in the Musi estuary ecosystem
SUITABILITY OF SPATIAL-TEMPORAL HABITAT OF YELLOWFIN TUNA (Thunnus albacares) USING MAXIMUM ENTROPY MODEL IN WEST SUMATRA
No full textYellowfin tuna is one of the main catches in West Sumatera waters and has a high economic value. Fishing optimization can be improved through spatial and temporal predictions of fishing areas for effective fisheries management. This research aims to predict fishing areas using an oceanographic data approach through maximum entropy (MaxEnt) modelling. Data collection incorporating sea surface temperature and chlorophyll-a were obtained from the Aqua-Modis satellite in 2022 as well as fishing point data from Ocean Fishing Port (OFP) Bungus. The MaxEnt model shows a good level of accuracy in the West season (AUC 0,860), 1st Transitional season (AUC 0,918), East season (AUC 0,918), and 2nd Transitional season (0,920) The contribution of chlorophyll for one year is more significant, accounted for 75,3%, compared to sea surface temperature, constituted 24,7%. The Sea Surface Temperature (SST) values in West Sumatera waters vary on each season, ranging from 26,4 to 34.5 ℃ and the chlorophyll-a fluctuate between 0,03 and 5,45 mg/m3. The distribution of yellowfin tuna habitat on the map shows that most fishing vessel coordinates are in the Habitat Suitability Index (HSI) HSI value of 0,6 – 0,9. Potential areas for catching yellowfin tuna are around the Mentawai Islands.
Keywords: Chlorophyll-a, HSI, Maximum Entropy Model, Sea Surface Temperature, Yellowfin Tun
Assessment of Seine Net Selectivity in Lake Maninjau, Agam Regency, West Sumatra - Indonesia
No full textUsing small mesh sizes on sein net in Lake Maninjau may lead to overexploitation. Research assessing selectivity of this fishing gear in this area is not conducted yet. Thus, this research aims to determine selectivity of seine net fishing gear operated in Lake Maninjau, Tanjung Raya District, Agam Regency, West Sumatra Province. There were seven units of seine net with 5 mesh sizes connected mesh sizes measuring 1.5 inches, 2 inches, 2.5 inches, 3 inches, to 3.5 inches that were assessed in this study. The results revealed that more than five species of fish were caught with various sizes, namely Tilapia (Orheochromis niloticus), Betutu (Oxyeleotris marmorata), Louhan (Amphilophus trimaculatus), Patin (Pangasius sp), and Sapu-sapu (Hypostomus plecostomus). Considering minimum landing size, 1,021 (82%) catch of Tilapia are suitable for catching meanwhile 231 (18%) are under minimum size for catch
Spatial Distribution of Mantis Shrimp (Harpiosquilla raphidea) in Small-Scale Gillnet Fishery: A Case Study in Kuala Tungkal, Tanjung Jabung Barat Regency, Jambi
No full textMantis Shrimp is one of economically important species due to its high value for export commodities. Mantis shrimp fishing in Kuala Tungkal is categorized as small-scale fisheries. This study aims to investigate the spatial distribution of mantis shrimp catches, both the number (individuals) and body length (BL) (cm) based on the distance from the shoreline to the fishing ground. A survey method was conducted in Kuala Tungkal, Tanjung Jabung Barat Regency, Jambi Province in December 2018. The observation covered 23 fishing trips by gillnet within 437 km2. The results revealed that the spatial distribution of the average number (individuals) of mantis shrimp in various stratifications reached 28-31 individuals. However, the farther fishing ground with higher salinity levels obtained a larger average size of mantis shrimp body length (BL). In the 0-4 mile stratification, it was found that the average catch size is 17.3 cm under the first maturity size which should be 19 cm. Meanwhile, in average the observed water condition as follow temperature is 28.2oC, DO = 7.4 mg/L, pH = 7, brightness = 1.1 m, and salinity is 20.9 ppt. At the end, the result of this spatial distribution may become an input for coastal resource management strategies and can support sustainable mantis shrimp fishing efforts
KEANEKARAGAMAN JENIS HASIL TANGKAPAN PADA ALAT TANGKAP GILLNET DI PERAIRAN HINAKO KABUPETAN NIAS BARAT PROVINSI SUMATRA UTARA
No full textProvinsi Sumatra Utara terletak di bagian barat Indonesia, dan memiliki wilayah laut yang sangat luas sehingga potensi kelautan dan perikanannya sangat besar. Perairan Hinako yang merupakan salah satu pulau di Provinsi Sumatra Utara memiliki potensi perikanan yang tinggi, namun belum banyak diketahui komposisi keanekaragaman jenis hasil tangkapan pada alat tangkap yang digunakan nelayan tradisional seperti gillnet. Tujuan dari penelitian ini adalah untuk mengetahui keanekaragaman jenis hasil tangkapan jaring insang di Perairan Hinako, Kabupaten Nias Barat, Provinsi Sumatra Utara, untuk merencanakan strategi penangkapan yang tepat. Alat tangkap yang digunakan dalam penelitian ini adalah alat tangkap jaring insang. Metode yang digunakan adalah metode survei dengan analisis indeks komposisi, indeks keanekaragaman Shannon-Wiener (H'), indeks keseragaman (E), dan indeks dominansi (C). Hasil penelitian menunjukkan terdapat 16 spesies ikan, dengan tangkapan utama tertinggi adalah ikan tongkol (Euthynnus affinis) sebanyak 31 ekor dan indeks keanekaragaman tergolong sedang (H'=2,45), keseragaman tinggi (E=0,88), dan dominansi rendah (C=0,10). Temuan ini menunjukkan kondisi ekosistem perairan yang stabil dan beragam. North Sumatra Province is located in the western part of Indonesia and has a very large sea area, so its marine and fisheries potential is very large. Hinako waters, which is one of the islands in North Sumatra Province, have high fisheries potential, but not much is known about the composition of the diversity of catch species in fishing gear used by traditional fishermen such as gillnets. The purpose of this study was to determine the diversity of gillnet catch species in Hinako Waters, West Nias Regency, North Sumatra Province. The fishing gear used in this study was gillnet fishing gear. The method used was a survey method with analysis of the composition index, Shannon-Wiener diversity index (H'), uniformity index (E), and dominance index (C). The results showed that there were 16 fish species, with the highest main catch being tuna (Euthynnus affinis) with 31 individuals and a diversity index classified as moderate (H'=2.45), high uniformity (E=0.88), and low dominance (C=0.10). These findings indicate a stable and diverse aquatic ecosystem.
Species diversity and size distribution of lift net catches in the coastal waters of Carocok Tarusan
No full textBoat seine gear is a fishing gear is classified as a purse seine that has high productivity, resulting in a high composition of catches. The composition of fish species in the body of water is used to predict species diversity to show the number of individuals or different types of fish due to differences in size, shape, and quantity. In addition to diversity, size distribution also functions to show the growth rate of fish based on length frequency in a body of water. The purpose of this study was to analyze the diversity and size distribution of catches from boat seines in the Carocok Tarusan Coastal Waters. A survei method was used in this study. A purposive sampling method was used for the sampling. The study showed that the total catch of boat seine was 433.904 fish weighing 899,86 kg, which was divided into main catch (HTU) and bycatch (HTS). The number of HTU catches of payang was higher (92.51%) than that bycatch of 7,49%. The diversity index value in the Carocok Tarusan Coastal Waters was 0,37, the uniformity index was 0,12 and the dominance index was 0,86. It can be concluded that the results of the diversity and uniformity index are relatively low while the dominance index value is relatively high. The distribution of anchovy size as the main result of payang, which is 64,74% is considered worthy of being caugh
Pengaruh Penurunan Kualitas Perairan Sungai Siak Kota Pekanbaru Terhadap Kebiasaan Makan Ikan Juaro (Pangasius polyuranodon)
No full textPangasius polyuranodon adalah salah salah satu ikan yang hidup di Sungai Siak Provinsi Riau. Dimana kualitas perairan di Sungai Siak termasuk dalam kategori tercemar berat. Ketersediaan makanan, kesuksesan reproduksi dan pola pertumbuhan ikan merupakan faktor penting dalam kelangsungan hidup ikan Pangasius polyuranodon. Untuk mengetahui pengaruh penurunan kualitas perairan terhadap ikan tersebut maka dilakukan penelitian pada bulan Desember 2016. Pengambilan sampel dilakukan sekali/minggu yang ditangkap di empat stasiun di Kota Pekanbaru. Sebanyak 42 ikan yang tertangkap dengan jumlah ikan betina 18 ekor dan ikan jantan 24 ekor. Pengamatan isi lambung dilakukan menggunakan metode gravimetrik. Isi lambung yang sudah dianalisis digunakan sebagai dasar untuk, menghitung Preponderance Index (PI). Hasil pengamatan menunjukan bahwa makanan utama ikan Pangasius polyuranodon adalah tumbuhan (PI 56,19), makanan pelengkap serangga (PI 18.04) dan sawit (PI 16,45), makanan tambahan berupa gastropoda (PI 2,97) dan Ikan (PI 0,20). Berdasarkan tingkat kematangan gonad hasil pengamatan memperlihatkan bahwa ikan lebih banyak memakan serangga dan sawit untuk perkembangan gonad. Berdasarkan data yang diperoleh dari penelitian ikan ini termasuk omnivore dimana penurunan kualitas perairan Sungai Siak tidak berpengaruh secara signifikan terhadap kebiasaan makan ikan juaro.
Pangasius polyuranodon is one of the fish that lives in the Siak River, Riau Province. Where the water quality in the Siak River is included in the heavily polluted category. Availability of food, reproductive success, and growth patterns of fish are important factors in fish survival Pangasius polyuranodon. To determine the effect of decreasing water quality on these fish, a study was conducted in December 2016. Sampling was carried out once / a week and was caught at four stations in Pekanbaru City. A total of 42 fish were caught with 18 female fish and 24 male fish. Observation of gastric contents was carried out using the gravimetric method. The gastric contents that have been analyzed are used as a basis for, counting Preponderance Index (PI). Observations showed that the main food of fish Pangasius polyuranodon are plants (PI 56.19), insect complementary foods (PI 18.04) and oil palm (PI 16.45), additional foods in the form of gastropods (PI 2.97) and fish (PI 0.20). Based on the level of maturity of the gonads, the results showed that fish eat more insects and oil palm for gonad development. Based on the data obtained from this research, this fish is an omnivore and the decrease in the quality of the Siak River waters does not significantly affect the eating habits of the juaro fish.
Effect of Time Difference in Catching Wire Bubu on Catch Results in the Waters of the Musi Tributary, Terusan Village, Musi Banyuasin Regency
No full textThis study aims to determine the effect of the difference in fishing time of wire bubu on the catch. This research was carried out for 30 arrests in the waters of the Musi tributary of the Musi River in Terusan Village, Musi Banyuasin Regency from January 4, 2024 to February 3, 2024. The method used in this study uses the experimental fishing method which is carried out during the day (11.00-17.00) and at night (18.00-24.00). The data obtained was then analyzed using the mean difference test (t-test). The results showed that the catch of sepat fish and snakehead fish during the day and night was significantly different (P0.05). The conclusion of this study is that there is a difference in fish catches during the day and at night where the catch using bubu fishing gear at night is higher than during the day
