24 research outputs found
Population dynamics of horse mussels Modiolus modulaides (Röding, 1798) in Kendari Bay, Southeast Sulawesi, Indonesia
No full textHorse mussels are bivalves found in Kendari Bay and are frequently consumed by the people in the surrounding coastal communities. The population dynamic of this mussel species in Kendari Bay is not yet fully understood. This study aims to determine the size structure, growth, mortality, and exploitation rate of horse mussels in Kendari Bay. This research was carried out in Kendari Bay on the outskirts of Southeast Sulawesi, Indonesia, from January to December 2019. Horse mussel samples of all different sizes were randomly collected from different points of the area of the mussel habitat. The collected samples were counted in total, and their shell length was measured using a caliper with an accuracy of 0.05 mm. The size, growth, mortality, and exploitation rate data were analyzed using the Bhattacharya method, inverse von Bertalanffy, Pauly empirical, and length-converted catch curve accommodated in the FiSAT II. The results showed that the horse mussels comprised two dominant size groups, with one dominating most of the months. The asymptotic length (L?) of the mussels was 9.7 cm, with a growth coefficient (K) of 1.1 yr-1. Moreover, the growth performance index of the mussels was (Ø)'=2.01 yr-1, and the maximum age (Tmax) was 2.73 years. The generated inverse von Bertalanffy equation for the horse mussels was Lt = 9.7-(9.7-0.025)e-1.1t. The natural mortality (M), fishing mortality (F), and total mortality (Z) of the horse mussels were 2.73 yr-1, 1.17 yr-1, and 3.90 yr-1, respectively. The horse mussels in Kendari Bay were well within the underexploited category, with an exploitation rate of 0.30
Length-weight relationships and condition index of Pokea clams (Batissa violacea var. celebensis, von Martens 1897) in the Laeya River, Southeast Sulawesi, Indonesia
No full textThe length-weight relationship and condition index of pokea clams in the Laeya River are not fully known. This study was aimed to determine the length-weight relationship and condition index of pokea clams in the Laeya River, Southeast Sulawesi. This research was conducted 10 months from May 2016 to February 2017 in the Laeya River, Southeast Sulawesi. Pokea clams are collected using a shovel. The length and weight of each clam was using calipers and analytical scales with accuracy of 0.05 mm and 0.01 g, respectively. The weight of the shell and dried meat was obtained by drying the shells first using an oven and weighing using an analytical balance with an accuracy of 0.01 g and 0.0001 g, respectively. The results showed that the relationship between length and weight of pokea clams in males and females were 2.61 and 2.78, respectively; with R2 values of 0.89 and 0.93, respectively. The highest b values for males and females were found in July with values of 3.03 and 2.94, respectively. The lowest b value was found in November with values of 2.45 and 2.46, respectively. The condition index values for males and females were 4.7 ± 2.2 and 5.17 ± 2.32, respectively. The highest condition index was found in May with values of 6.00 ± 3.07 and 7.83 ± 2.55, respectively. The condition index values for males and females increased with increasing shell size. Male and female at the largest size (6.01-6.05 cm) had the highest index with values of 8.05 ± 6.41 and 9.12 ± 3.38, respectively. In conclusions, the growth was negative allometric pattern, condition index was in fat category, and had peak spawning in July and experienced partial spawning in September-February
PERENCANAAN STRATEGI PEMASARAN PADA PENJUALAN KOPI DENGAN MENGGUNAKAN METODE SWOT DAN QSPM DI BYCOFFEE MALANG
No full textJika membutuhkan abstrak atau isi jurnal silahkan menghubungi author melalui email [email protected] atau [email protected] Dipublikasikan tanggal: 27 Agustus 202
Estimasi Biomassa Mangrove Menggunakan NDVI (Normalized Difference Vegetation Index) di Desa Soligi, Kabupaten Halmahera Selatan
No full textMangrove merupakan tumbuhan tingkat tinggi yang tumbuh pada habitat intertidal antara daratan dan laut di daerah tropis serta subtropis. Keberadaan mangrove sangat penting dalam mengurangi risiko bencana akibat perubahan iklim karena kemampuannya yang signifikan dalam menyimpan karbon pada biomassa dan sedimen. Penelitian ini bertujuan untuk menganalisis biomassa ekosistem mangrove berdasarkan kategori NDVI (Normalized Difference Vegetation Index) di pesisir Desa Soligi, Kecamatan Obi Selatan, Kabupaten Halmahera Selatan dengan total luas area 12,12 hektar dan total biomasa mencapai 899,78 ton. Kategori NDVI dibagi menjadi empat kelas yaitu: Sangat Rendah, Rendah, Sedang, dan Tinggi. Hasil analisis menunjukkan bahwa kategori Tinggi berkontribusi terbesar terhadap total biomasa dengan 639,94 ton/ha, terdiri dari 499,97 ton/ha untuk biomassa di atas tanah (AGB) dan 139,98 ton/ha untuk biomassa di bawah tanah (BGB). Sebaliknya, kategori Sangat Rendah menunjukkan nilai biomasa yang sangat rendah, yaitu 0,32 ton/ha. Temuan ini menekankan pentingnya pengelolaan dan konservasi ekosistem mangrove untuk meningkatkan kapasitas penyimpanan karbon dan mendukung keberlanjutannya
Density, Water Quality Suitability and Size Distribution of Pokea Clams (Batissa violacea var. celebensis, von Martens 1897) at Lasolo River Southeast Sulawesi
No full textKepadatan dan distribusi ukuran kerang pokea relatif berbeda-beda disetiap tempat dan waktu yang dipengaruhi oleh kualitas lingkungan perairan. Penelitian ini bertujuan untuk mengetahui kepadatan kesesuaian kualitas perairan, dan distribusi ukuran kerang pokea di Sungai Lasolo Sulawesi Tenggara. Sampel kerang pokea dikumpulkan secara acak di seluruh bagian perairan setiap bulan selama 1 tahun di Sungai Lasolo Konawe Utara. Sampel kerang dikumpulkan menggunakan luas sapuan alat tangkap tangge (alat tradisional) sebanyak 6 kali tarikan. Pengambilan sampel kualitas air dilakukan bersamaan dengan pengambilan sampel kerang. Kepadatan kerang antar tempat dan waktu pengamatan dianalisis menggunakan uji Mann-Whitney. Preferensi pokea pada kualitas perairan dianalisis menggunakan Analisis Komponen Utama (PCA) dan Analisis Kelompok (CA) pada paket program statistik multivariat (XLSTAT). Hasil analisis menunjukkan kepadatan daerah tengah muara sungai berbeda nyata (lebih tinggi) dengan pada daerah awal dan akhir ditemukan ke arah hulu (kepadatan terendah) dan ke arah muara, sedangkan kepadatan kerang pokea tidak nyata berbeda di setiap bulan pengamatan. Kerang pokea dominan ditemukan pada ukuran kecil (1,62-2,10-3,09-3,57 cm). Ukuran kerang pokea terdistribusi pada seluruh bagian perairan dan ditemukan melimpah pada bulan Mei dan Juni. Kerang pokea cenderung menyenangi kualitas perairan yang berarus lambat, kecerahan tinggi dan perairan dalam.The pokea density and its size distribution are different in every place and time which influenced by water quality. This study aimed to determine the density and suitability of water quality, and size distribution of pokea at Lasolo River, Southeast Sulawesi. Pokea samples were collected randomly in all water segment every month for 1 year in the area of Lasolo River, North Konawe. Some samples of pokea were collected using the wide range of tangge fishing gear (traditional tool/ traditional fishing gear) as much as 6 pull times. In the process of collecting the sample of water quality, it was done simultaneously with the samples of shell. The shell density in every place and time was analyzed using the Mann-Whitney test. The preferences of pokea in water quality were analyzed using Principal Component Analysis (PCA) and Group Analysis (CA) in the package of multivariate statistical program (XLSTAT). The results of this analysis showed that the density of the middle of estuary was significantly different (higher) than its density in the initial and final regions which found upstream (lowest density) and in the estuary area, while the density of pokea was not significantly different in each month of observation. The pokea were dominantly found in small size (1.62-2.10-3.09-3.57 cm). The size of the pokea were distributed in all water segment, which were so many in May and June. The preferences habitat of pokea were the slow-flowing, high-brightness, and deep water
Reproduction of Meretrix meretrix Clams in The Kambu River Estuary, Southeast Sulawesi: Reproduksi Kerang Tahu (Meretrix meretrix) di Muara Sungai Kambu, Sulawesi Tenggara
No full textMeretrix meretrix is a degraded resource in Kendari Bay waters, but its reproductive pattern is not fully known.. This study aims to determine the level of gonad maturity, gonadal maturity index, fecundity and the size of the first gonad maturity of M. meretrix at the Kambu River estuary, Kendari Bay, Southeast Sulawesi. This research was carried out at the Kambu River estuary for 6 months from August 2021-January 2022. These clams were taken randomly representing all size classes as many as 300 birds during the study. M. meretrix were observed for gonad color and gonad development microscopically, then the length and weight of the gonads were measured using a caliper and analytical balance with an accuracy of 0.5 mm and 0.0001g, respectively. The results showed that the development of male and female gonads was relatively simultaneous, which was dominated by mature gonads (III-IV) in each month of observation. TKG I-V was found in every month of observation. The gonad maturity index of males and females were 4.92-6.00 and 5.53-6.32, respectively. The fecundity of M. meretrix ranged from 4882-85677 grains. The first mature size of the gonads of male and female M. meretrix is 20 mm.Meretrix meretrix is a degraded resource in Kendari Bay waters, but its reproductive pattern is not fully known.. This study aims to determine the level of gonad maturity, gonadal maturity index, fecundity and the size of the first gonad maturity of M. meretrix at the Kambu River estuary, Kendari Bay, Southeast Sulawesi. This research was carried out at the Kambu River estuary for 6 months from August 2021-January 2022. These clams were taken randomly representing all size classes as many as 300 birds during the study. M. meretrix were observed for gonad color and gonad development microscopically, then the length and weight of the gonads were measured using a caliper and analytical balance with an accuracy of 0.5 mm and 0.0001g, respectively. The results showed that the development of male and female gonads was relatively simultaneous, which was dominated by mature gonads (III-IV) in each month of observation. TKG I-V was found in every month of observation. The gonad maturity index of males and females were 4.92-6.00 and 5.53-6.32, respectively. The fecundity of M. meretrix ranged from 4882-85677 grains. The first mature size of the gonads of male and female M. meretrix is 20 mm
Waste Water Reduction Using Four Densities of Seaweed to Improve Water Quality for White Leg Shrimp (Litopenaeus white leg) Culture: Laboratory Scale
No full textThe low environmental quality of pond water is caused, among other things, by the large amount of organic waste and nutrients (feed components) in pond water outflow. The remaining feed and feces (feces) decompose in pond water before being dumped into the nearby rivers, resulting in the discharge of high levels of nutrients and organic waste. One method for enhancing the effluent quality from aquaculture is a biofilter. In order to reduce and absorb dissolved organic contaminants, biofilters are used. It is possible to employ Gracilaria sp. as a biofilter, which is an efficient technique to increase sanitation. The study' goals were to determine how well Gracilaria sp. developed and how well seaweed absorbed N and P elements from vaname shrimp culture waste, specifically ammonia (NH3), nitrite (NO2), and nitrate (NO3). Three different treatments for the weights of the seaweed were employed in the study: 50, 75, and 100 grams. The analysis showed that the 100 g of Gracilaria sp. was very effective in absorbing N and P waste. It was discovered that N and P component absorption was, respectively, 75.10% and 75.15% effective
PERPINDAHAN ONTOGENETIK HABITAT IKAN DI PERAIRAN EKOSISTEM HUTAN MANGROVE
No full textOntogenetic of fish is a term used to study the development of the behavior of an individual throughout its life (life-span) from hatched to death. The mangrove ecosystem is a potential habitat for fish, especially the juvenile stage. Juvenile found in this habitat is an important economically fish. In various types of fish, the phenomenon of increasing the size of the fish body followed by changes in the types of food causing ontogenetic habitat of fish. It is evident in yellow snapper Lutjanus argentiventris. The juveniles live in mangrove habitat to approximately 100 mm or 300 days old, after which the fish move to deeper surrounding habitat. Mangrove forest that has a high complexity is to serve as an adaptation of fish to avoid predators and foraging. Several different habitats, both the mangrove ecosystem and other ecosystems provide different foods according to the needs at each phase-change of fish life. Animals that undergo ontogenetic habitat drift has management consequences that are more sensitive than animals inhabiting on single habitat. Hence, particularly habitat conservation resource management is needed. Not only conservation of the habitat, but also other habitats related to the migration of fish. Keyword: conservation, diet, growth, mangrove, ontogenetic </p
Production, biomass, and turnover of exploited mangrove clams (
No full textGeloina expansa is a front-runner commodity of the mangrove ecosystem. This species is notably experiencing ecological pressures in Kendari Bay. Accordingly, this study aims to determine their production, biomass, and turnover in the mangrove ecosystem. This research is hoped to provide empirical information that will aid in the formulation of the management strategy of mangrove clam resources in Southeast Sulawesi. Clam samples were collected at random in three selected sampling areas using a 1x1 m2 quadrat-transect sampling approach. The clams were measured for their shell length, total weight and weight of fresh meat. The clam meat was dried to obtain a shell-free dry mass. The production, biomass, and turnover of the clams were calculated using standard formulas. The population density of the clams ranged from 23.78 ind/m2 (October) to 77.44 ind/m2 (February), where the remaining months of observations showed similar values throughout. The clams biomass population in each size class ranged from 0.04 to 4.95 g/m2. The somatic production, as per the dry weight showed the highest value at 6.9 cm shell length (2.01g/m2/year). The lowest individual somatic production was found in the shell width of 9.7 cm (0.55 g/m2/year). The turnover rate (P/B) of the mangrove clam was 1.73/year. The density of the mangrove clams in the mangrove forest in Kendari Bay was found to be high. This was accompanied by high productions in the young or small-sized groups, peaking at a size smaller than the size where peak biomass was found
Growth pattern and condition index of exploited Meretrix meretrix (Linnaeus, 1758) at Kambu River estuary, Southeast Sulawesi, Indonesia
No full textMeretrix meretrix is one of the economical shellfish that has been exploited in Kendari Bay, Indonesia. Several studies have been done, but its growth pattern and condition index are not fully known. This study aims to determine its growth pattern and condition index at the Kambu River estuary, Kendari Bay. This research was conducted for 6 months from August 2021 to January 2022. Clams were collected using a rake, cleaned, and brought to the laboratory to be measured for length and weight using calipers and scales with an accuracy of 0.1 mm and 0.01g, respectively. Furthermore, the clam meat was dried using an oven and weighed. Data on growth and condition index were analyzed using simple regression and the Mann-Whitney test, respectively. The results showed that the growth of M. meretrix was in negative allometric conditions, with b values in males and females in the range of 2.20-3.00 and 1.86-2.73, respectively. The condition index of male and female clam ranged from 1.86-2.62 and 1.66-2.41, respectively, and differed significantly by month. The results of the Mann-Whitney test on clam showed that there was no significant difference between August-November and December-January. In conclusion, male and female clam had relatively different patterns based on the observation period, while the condition index was in the skinny and medium categor
