Potensi ikan sidat (Anguilla marmorata Quoy & Gaimard, 1824) di Indonesia cukup tinggi. Keberadaan potensi benih ikan sidat dari alam belum dimanfaatkan secara optimum untuk dibesarkan sampai ukuran konsumsi, sehingga perlu dikembangkan teknologi pembesaran. Diharapkan teknologi yang diterapkan dan dikembangan dapat dilakukan baik pada skala kecil maupun skala besar. Permasalahan dalam budidaya ikan adalah mempertahankan kualitas air agar tetap baik. Salah satu eknologi yang dapat diterapkan adalah teknologi Recirculating Aquaculture System (RAS) atau sistem budidaya dengan resirkulasi menggunakan filter alami berasal dari tanaman biofilter. Tujuan penelitian untuk mengetahui penggunaan biofilter berbeda pada sistem resirkulasi terhadap pertumbuhan dan kelangsungan hidup (sintasan) ikan sidat (A. marmorata). Penelitian dilaksanakan di Laboratorium Kualitas Air dan Biologi Akuatik, Program Studi Akuakultur Fakultas Peternakan dan Perikanan Universitas Tadulako, Palu. Penelitian didesain menggunakan Rancangan Acak Lengkap (RAL) 4 perlakuan dan 5 ulangan. Perlakuan diterapkan berupa penggunaan biofilter, terdiri dari: perlakuan A = Biofilter Selada, perlakuan B = Biofilter Seledri, perlakuan C = Biofilter Pakcoy, perlakuan D = Biofilter kangkung. Hasil penelitian menunjukkan bahwa penggunaan biofilter tanaman berbeda berpengaruh nyata terhadap pertumbuhan bobot mutlak ikan sidat. Penggunaan biofilter kangkung diproleh nilai tertinggi pada pertumbuhan bobot mutlak (0,29±0,05 g), pertumbuhan bobot spesifik (1,83±0,28%); nilai terendah pertumbuhan bobot mutlak pada penggunaan biofilter selada (0,19±0,03 g) dan pertumbuhan bobot spesifik pada perlakuan biofilter packcoy (1,38±0,21%). Kelangsungan hidup tertinggi pada perlakuan biofilter kangkung (76±8,94%), sedangkan terendah pada perlakuan biofilter seledri (60±14,14%). Hasil penelitian disimpulkan bahwa penggunaan biofilter tanaman kangkung merupakan perlakuan terbaik untuk pembesaran ikan sidat (Anguilla marmorata Quoy & Gaimard).

Introduction: Freshwater ecosystems play a crucial role in supporting human life, providing many ecosystem services. Species diversity is a valuable indicator for evaluating ecosystem health, gaining a broader perspective on ecological richness and ecosystem functions, but data are lacking for many rivers. Objectives: To obtain baseline data on the upstream and downstream ichthyofauna of the Balantak River, Banggai Regency, using environmental DNA (eDNA) with a focus on diadromous species. Methods: We collected, filtered and preserved water samples from upstream and downstream sites on the Balantak River followed by eDNA analysis (DNA extraction, PCR with MiFish 12S rRNA primers, Illumina sequencing, MitoFish bioinformatic analysis at 97 and 99 % identity thresholds) to produce taxonomically assigned Actinopteri amplicon sequence variants (ASVs). Results: Our data are consonant with the expected dominance of diadromous and euryhaline taxa (75 %), high Gobiiformes biodiversity, and differences between upstream and downstream ichthyofaunal communities. Reads were assigned to Actinopteri ASVs from 12 orders, predominantly Gobiiformes, Anguilliformes, and Centrarchiformes. The 15 assigned families included Anguillidae, Eleotridae, Gobiidae, Rhyacichthydae, Kuhliidae, and Terapontidae. Of the assigned genera (17 at 97 % and 25 at 99 %), Anguilla had the most reads (39.9 %), and Sicyopterus had the most ASVs (8). Conclusions: These baseline data demonstrate the usefulness of eDNA metabarcoding for exploring ichthyofaunal biodiversity in small tropical watersheds while highlighting gaps in 12S rRNA sequence databases, reinforcing the need for integrative taxonomic research in Sulawesi watersheds and reliable reference databases. Most assigned taxa are vulnerable to exploitation for food and/or the ornamental fish trade. Four non-native taxa from Cichlidae, Cyprinidae and Clariidae are considered invasive. Implications for conservation include the need to address the unregulated and largely unreported freshwater ornamental trade and introduction of non-native invasive species.

Aquaponic technology is an aquaculture method using a combination of plants and fish, where fish feces provide nutrients for plants and plants act as filters to maintain water quality. This technology can be easy and practical to use, with advantages in terms of land use and limited water resources. This study used a combination of lettuce plants and tilapia (Oreochromis niloticus) given feed containing water hyacinth flour. The aim was to examine the effect of tilapia stocking density on fish growth and survival, and on water quality. A Completely Randomized Design (CRD) was used with 4 treatments and 5 replicates. The tilapia stocking density treatments tested were 10, 15, 20 and 25 fish in 10 L of water. The variables measured were net weight gain, specific growth rate in weight, survival, and water quality. The results showed that stocking density had a significant effect on the specific growth of tilapia. The treatment with a density of 20 fish/10L gave the best results, with a net weight gain of 35.50 g, a specific growth rate in weight of 0.0756%/day, and 100% survival. Overall, the stocking density treatment of 20 fish/10L was the best treatment. The water quality parameters measured during the research remained within ranges considered suitable to support tilapia growth and met the Indonesian National Standards (SNI) for tilapia cultivation (SNI 6139:2009).

Limited urban land and women's low technical capacity in integrated agriculture necessitate an adaptive, technology-based empowerment strategy. This study examines the level of understanding of aquaponics cultivation among members of the Dasawisma Melati PKK group in Tanamodindi Urban Village, Palu City. It identifies development constraints, opportunities, and strategic formulations. The novelty of this research lies in integrating a mixed-methods approach with SWOT-AHP analysis to empower urban PKK women's groups. This area remains under-investigated empirically in Indonesia. The study involved 13 active group members over eight weeks (October–December 2025). It used Focus Group Discussions (FGDs), Likert-scale questionnaires, in-depth interviews, field observations, and pre-tests and post-tests. Despite the small sample size (This approach is representative as it encompasses all active members directly involved in managing the Green Farm House facility. The cultivated commodities consisted of 350 African catfish (Clarias gariepinus) with a 6% feeding rate and 48 heads of lettuce (Lactuca sativa L.). The cultivation results showed that catfish biomass increased from 37 grams to 667 grams over eight weeks, with an 83.71% survival rate. The lettuce plants grew from 2 cm to 17–23 cm, with an average harvest weight of 156.3 grams per plant. Water quality remained stable at temperatures of 30–31 °C and a pH of 7. Although an increase in ammonia from 2.3 mg/L to 8.2 mg/L was observed—which theoretically approaches the toxicity threshold—it did not correlate with the high survival rate (; moderate positive correlation), thereby indicating potential fish adaptation or the effectiveness of the biofiltration system. Participants' understanding increased significantly from 54.02% to 85.13%. All variables, including program quality, participation, and socio-environmental benefits, shifted to the "very high" category. The Public Satisfaction Survey recorded an index of 101.25 (89.91% satisfaction level). The SWOT analysis placed the group in Quadrant I (IFAS 3.9; EFAS 3.8). Through AHP with a Consistency Ratio of 1.9%, four priority strategies were established, with routine training at the Green Farm House designated as the primary program (62% weight). This study demonstrates that aquaponics, grounded in the empowerment of PKK women, is effective at sustainably strengthening urban food security and holds potential as a replicable model for other cities. However, further research with larger sample sizes and longer observation periods is required.

Tilapia (Oreochromis niloticus) is a cultivated fishery commodity that has undergone strain development. Among them, red tilapia (Oreochromis sp.) is now an important export product. Red tilapia cultivation faces several major challenges, including limited land availability, insufficient water availability, and poor or suboptimal water quality in the cultivation media. However, these problems can be overcome by applying environmentally friendly aquaponic cultivation methods. The aquaponic system is an integrated cultivation method that combines fish and plants. The system used in this aquaponic cultivation method is the Nutrient Film Technique (NFT), which uses horizontal PVC pipes through which water flows thinly beneath the plant roots. This system is highly efficient for leafy vegetables. This method is efficient in land and water use, and utilizes fish waste as a natural fertilizer for plants. The purpose of this study was to examine the effect of stocking density levels on the growth performance of red tilapia cultivated using the aquaponic method. The research location was the Water Quality and Aquatic Biology Laboratory, Faculty of Animal Husbandry and Fisheries, Tadulako University, Palu. The study used a Completely Randomized Design (CRD) experimental design method, in which the treatment was repeated four times. The treatments tested were variations in the stocking density of red tilapia in an aquaponic system, which were divided into four different levels: A (stocking density of 15 fish/30 L), B (stocking density of 20 fish/30 L), C (stocking density of 25 fish/30 L), and D (stocking density of 30 fish/30 L). The fish were maintained for 52 days. The variables observed in this study included absolute growth, specific growth rate, and survival rate. The observation data were tabulated and then analyzed using the analysis of variance (ANOVA) method with a 95% confidence level. The results of the study concluded that the stocking density of 20 fish/30 L was the best because it produced the largest weight gain 3.63 g, length 1.69 cm, specific growth rate 2.03%/day. However, the best survival rate (85%) was found in the treatment with a stocking density of 15 fish/30 L.

Kegiatan Pengabdian kepada Masyarakat (PKM) bertujuan untuk memanfaatkan potensi kerang air tawar dari Perairan Danau Dampelas. Permasalahan utama yang dihadapi mitra saat ini rendahnya pengetahuan masyarakat sekitar terkait teknologi pengolahan kerang air tawar menjadi produk olahan siap konsumsi maupun menjadi produk yang bisa disimpan dalam jangka panjang. Tidak adanya nilai ekonomis dan keterampilan dalam pengolahan, sehingga menyebabkan masyarakat sekitar membiarkan kerang tersebut begitu saja dipinggiran danau hingga mati. Tujuan pelaksanaan PkM membantu masyarakat dalam hal manajemen produksi kerang air tawar sehingga produk yang dihasilkan dapat dimanfaatkan masyarakat dan Menghasilkan calon-calon wirausaha (sebagai embrio dimulai dari kelompok ibu- ibu PPK Desa Talaga). Metode yang digunakan dalam kegiatan pengabdian ini adalah pendekatan partisipatif dengan melibatkan masyarakat sebagai mitra. Kegiatan berupa sosialisasi, ceramah dan demonstrasi pembuatan produk. Hasil PkM telah memberikan wawasan dan pengetahuan kepada kelompok mitra tentang manajemen usaha, pengetahuan tentang nilai gizi dan manfaat kerang air tawar bagi kesehatan. Oleh karena itu, pengabdian kepada masyarakat ini dapat menjadi acuan dalam memberikan penyuluhan dan pelatihan untuk meningkatkan pengetahuan dan keterampilan kelompok mitra dalam menghasilkan makanan berasal dari potensi lokal bernilai gizi tinggi untuk meningkatkan kesehatan ketahanan pangan keluarga. Kemampuan kelompok mitra akan diaplikasikan pada masyarakat Desa Talaga secara umum bahkan kedepannya berpeluang untuk dijadikan sebagai usaha untuk meningkatkan ekonomi keluarga.

The Banggai cardinalfish (Pterapogon kauderni Koumans, 1933) is an endemic species that inhabits a limited habitat in shallow waters. This species is a widely traded marine ornamental fish. However, since late 2007, the International Union for Conservation of Nature (IUCN) has classified P. kauderni as an endangered species. Changes in P. kauderni habitat in Palu Bay have been reported, particularly in the waters of Mamboro Village Beach. According to local community information, this species has been introduced to Kayumalue Pajeko Village Beach, also within the Palu Bay area. Daily human activities and environmental changes caused by natural disasters and post-tsunami recovery necessitate annual updates on population development data and habitat conditions. This study aimed to reassess the habitat conditions of P. kauderni in the waters of Kayumalue Village, Palu Bay. Observation results showed that P. kauderni was only found in the macrohabitat of sea urchins. Meanwhile, along the observed transect, no recruit-sized P. kauderni were found. This is suspected to be due to the limited availability of macro habitat types such as anemones or other soft corals.

The Banggai MPA is one of many Indonesian MPAs established or reestablished as a result of the shift from regency to provincial level governance over waters 0–4 NM from shore under Act 23/2014. The MPA covers a substantial proportion of Banggai Archipelago coastal ecosystems and around 90% of endangered Banggai cardinalfish (Pterapogon kauderni) endemic habitat. An expedition in 1998 reported high fish biodiversity; however, logistics and taxonomic expertise requirements mean that similar methods are not realistic for collecting baseline or monitoring biodiversity data to support MPA management. A pilot project in 2018 collected water samples (four shallow-water coastal sites, three replicates per site) around Banggai Island for environmental DNA (eDNA) metabarcoding using two molecular markers: COI mtDNA and 12S rRNA. COI data were overwhelmingly dominated by a few phytoplankton species, reflecting challenges using this marker in areas with dense phytoplankton, and could not be analyzed further. The 12S rRNA sequences were processed and aggregated into amplicon sequence variants (ASVs) using the Anacapa Toolkit. These data provide a snapshot of fish diversity by site, although accumulation curves indicate three samples per site is insufficient to provide a comprehensive record. Identified taxa overlapped and exceeded in number those detected in 1998. The percentage of ASVs unassigned at species and genus level (e.g., gobies and cardinalfishes) and taxonomic ambiguities indicate a need for combined classical taxonomic and barcoding studies to enhance nucleotide databases (GenBank/BOLD), ideally with regional voucher specimen repositories. Furthermore, the study revealed the need for further capacity building in metabarcoding data analysis.

Sulawesi and its satellite archipelagos lie within the Wallacea region and Coral Triangle biodiversity “hotspots”. Environmental DNA (eDNA) metabarcoding can help detect easily missed or challenging to identify groups such as blennies (Blenniiformes). A pilot eDNA study within the recently established Banggai MPA aimed to provide fine-scale data. Seawater samples were collected at four sites (3 replicates/site) around Banggai Island. DNA extraction (Bionesia, Bali), metabarcoding (MiFish 12S rRNA primers) and sequence library preparation (Barber Lab, University of California Los Angeles), Nextseq High-throughput sequencing, and Anacapa Toolkit analysis produced 254,847 teleost reads aggregated into amplicon sequence variants (ASVs). At 60%, 90% and 100% Bayesian confidence levels, respectively, 1612, 1610 and 1573 reads were assigned to Blenniiformes, while 15 of 20, 12 of 20 and 11 of 18 ASVs were assigned to species level. Blenniiformes ASVs comprised two families: Blenniidae (genera Atrosalarias , Cirripectes , Ecsenius , Exallias , Meiacanthus , Omobranchus , Salarias ) and Tripterygiidae (genus Enneapterygius ). Assigned genera overlapped with 1998 visual survey data. Phylogenetic analysis (MEGA 11) incorporated NCBI GenBank accessions (BLASTn tool). Blenniiformes community composition differed between sites. This study contributes baseline biodiversity data for Blenniiformes in the Banggai MPA; however, unassigned ASVs and phylogenetic analyses highlight the gaps in 12S rRNA reference databases.

This work was conducted to determine the heavy metal concentrations in sediments; assess the level of contamination using a contamination index and identify potential sources of heavy metal contamination using multivariate analysis. This work employed contamination indices to evaluate sediment pollution levels. Heavy metal concentrations were analyzed statistically by determining the minimum, maximum, mean, and Standard Deviation (SD) values. According to the contamination factor (Cf), Cd showed very high contamination levels, whereas Sn, Ni, and Pb showed moderate contamination. Hg, As, Cr, and Cu were classified as having low contamination levels. The degree of contamination (Cdeg) ranged from low to high across the sampled sites, reflecting varied levels of pollution severity. Multivariate statistical analyses, including Principal Component Analysis (PCA), Pearson correlation matrix, and Cluster Analysis (CA), were used to identify the potential sources of heavy metal contamination; Cu, Sn, Ni, Hg, and Cr are attributed to natural geological processes, whereas Pb, Cd, and As are linked to anthropogenic activities, likely originating from the nickel mining industry. In conclusion, this work underscores the complex environmental impact of nickel mining in Morowali, highlighting the need for stringent environmental management practices to mitigate further degradation and safeguard coastal ecosystems in Central Sulawesi.

Banggai Cardinalfish (BCF) habitat is found in protected waters, such as Lalong Bay, Banggai Regency. Banggai cardinalfish are associated with various biota such as sea urchins (especially Diadema setosum) which live close to coral reef, seagrass and mangrove ecosystems. The aim of this research was to analyze marine debris contamination in Banggai cardinalfish habitat in Lalong Bay. This research used a quadrat sampling method (2m x 2m) along 20 m-30 m line transects at 4 research stations. Based on the analysis, organic marine debris types comprised: medium-sized pieces of wood, wood chips, coconuts, coconut husks, leaves and fish carcasses. Inorganic marine debris types comprised glass bottles, tin cans, light bulbs, baby diapers, cooking oil bottles, mineral water bottles, plastic cups, plastic spoons, toothbrushes, buoys, plastic packaging, plastic baskets, lighters, ropes, fishing nets, styrofoam, rubber sandals, tires and other plastic debris. The average amount of debris was 17 items/m2, volume 0.13 m3, weight 1,251 gr/m2 at Station 1; 16.75 items/m2, volume 0.10 m3, weight 1,157 gr/m2; at Station 2; 20.5 items/m2, volume 0.04 m3, weight 2,341 gr/m2 at Station 3 26.3 items/m2, volume 0.07 m3, weight 1,895 gr/m2 at Station 4. Based on observations at these stations in the port, much of the BCF fish habitat was found to be exposed to marine debris due to high levels of human activity and a lack of waste management capacity.

Sulawesi Island in the Wallacea bioregion, Indonesia, has a rich aquatic fauna, with many endemic species including freshwater snail radiations. Variations in shell morphometry can reflect diversity, distribution, interactions with other species and their environment. The purpose of this study was to identify and describe morphometric characters of gastropods from the Pattunuang Maros River, South Sulawesi. Samples were collected using a belt transect method and environmental parameters were recorded during sampling. The 87 snails collected comprised three morphotypes; two were identified as members of the Sulawesi endemic genus Tylomelania : T. wallacei (density 0.183 ind/m 2 ) and T. perfecta (density 0.178 ind/m 2 ). Morphomeristic characters measured were shell length, shell width, shell aperture length and width, body whorl length, numbers of axial and spiral ribs and whorls in the spire, and the spire angle. Regression analyses showed moderate to strong (R 2 0.73 − 0.95) allometric negative correlation between wet weight (W) and shell length, and between W and spire angle. Condition factor analyses indicate that, under the environmental conditions in the Pattunuang River, T. perfecta shell weight increased faster with length and with spire angle compared to T. wallacei , likely due to the greater shell thickness in T. perfecta .

The striped snakehead (Channa striata Bloch, 1793) is a freshwater fish which has long been popular as a food fish. Commonly found in freshwater bodies such as rivers, swamps and lakes, striped snakeheads have a high albumin protein content which can help to accelerate wound healing, facilitate the circulation of body fluids and maintain osmotic pressure in the body. Salinity is one of the limiting factors that can affect fish growth and survival. Changes in salinity could directly affect striped snakehead growth and metabolism. The purpose of this study was to determine the effect of different salinity treatments on the growth and albumin content of juvenile striped snakeheads. The research was conducted in November-December 2021 at the Water Quality and Aquatic Biology Laboratory, Faculty of Animal Husbandry and Fisheries, Tadulako University, Indonesia. The study applied 5 salinity treatments (2 ppt, 4 ppt, 6 ppt, 8 ppt and 10 ppt) with 8 replicates for 30 days. Net weight gain, specific growth rate (weight and length) and survival rate did not differ significantly between treatments (ANOVA, P>0.05). The Tukey post-hoc test indicated significantly higher growth under the 8 ppt salinity treatment (1.04±0,19 cm) with 100% survival rate. Albumin content increased linearly with salinity from 2 ppt (3.6-4.0%) to 10 ppt (4.9-5.3 %).

Lake Poso is one of the world’s ancient lakes and is home to several endemic fish. One of these is the Sarasin’s goby Mugilogobius sarasinorum, local name bungu masiwu. For a long time, the community around Lake Poso, predominantly of the Pamona ethnic group, have used a traditional fishing gear called inanco. The objective of this study was to describe inanco fishing gear and evaluate the catch composition. The research location in Bo'e Village River (inlet Lake Poso). Research was conducted in March-June 2020. The result showed inanco is made from Arenga pinnata leaves, with 20 leaves used for each unit. The inanco is weighted with stones so the leaves won't drift away. The fish will hide between the leaves in the inanco structure, and can be harvested on the following day. The inanco is highly selective with minimal environmental impact and has potential as a conservation and sustainable fishing gear.

This study investigated the impact of varying stocking densities and plant species interactions within an aquaponic framework. Conducted over a 45-day period (August-October 2023) at the Experimental Farm of Tadulako University, Palu, Central Sulawesi, the research utilized juvenile Sangkuriang catfish (Clarias gariepinus var. Sangkuriang) as the focal organism. Employing a factorial design, with stocking densities 12, 20, and 28 fish per 40 liters of water and three distinct plant species (Ipomoea aquatica, Brassica rapa subsp. chinensis, and Lactuca sativa), the study aimed to elucidate optimal growth conditions. Key findings revealed that the stocking density of 12 fish per 40 liters of water, coupled with pakchoi plants, yielded the most significant growth enhancements. Specifically, this configuration demonstrated a specific growth rate of 6.66±0.7% and absolute weight growth of 14.06±1.0, along with a specific length growth rate of 2.10±0.6% and absolute length growth of 4.48±0.6%. Notably, water quality parameters remained within acceptable limits across all treatments, ensuring an environment conducive to catfish growth. In conclusion, this research underscores the critical role of stocking density and plant selection in optimizing aquaponic systems. The findings offer valuable insights into enhancing both fish and plant growth dynamics within integrated aquaponic frameworks. Keywords: Catfish farming, aquaponics, growth rate, survival rate.

Pengabdian kepada masyarakat bertujuan untuk meningkatkan konsumsi ikan sebagai sumber protein hewani berkualitas melalui pembuatan dimsum berbahan dasar ikan. Kegiatan ini dilaksanakan di Kelurahan Tondo, Kecamatan Mantikulore, Kota Palu Sulawesi Tengah pada tahun 2024 dengan melibatkan 30 peserta dari berbagai latar belakang, termasuk ibu rumah tangga dan remaja. Metode yang digunakan meliputi penyuluhan terkait dengan pemenuhan gizi, demonstrasi pembuatan dimsum ikan, dan praktek langsung oleh peserta. Hasil kegiatan menunjukkan peningkatan pengetahuan dan keterampilan peserta dalam mengolah ikan, serta penerimaan yang baik terhadap produk dimsum ikan dari segi rasa dan gizi. Selain memenuhi kebutuhan gizi keluarga, kegiatan ini membuka peluang usaha kecil berbasis olahan ikan. Diharapkan, kegiatan ini dapat berkontribusi dalam peningkatan konsumsi ikan dan kesejahteraan masyarakat secara berkelanjutan.

Introduction: Tilapia (Oreochromis niloticus) is one of the leading commodities of freshwater aquaculture in Indonesia. The problem that is often experienced by farmers is the absorption of fish feed nutrients that are less than optimal, due to the low quality of feed raw materials. The study aims to determine the effect of adding probiotics to feed on growth and survival, in tilapia (O. Niloticus) fry. Method: The test organisms used in this study were tilapia (O. niloticus) as many as 200 fish with an initial weight of 1.09-1.28 g/head. Tilapia seeds were obtained from UPR Saluyu, Dolo sub-district, Sigi district, Central Sulawesi. The design used was a complete randomized design (CRD). Results and Discussion: Variables observed were daily weight growth rate (LPBH), absolute weight growth (PBM), survival rate, feed conversion ratio (CTR), and water quality. Conclusion: The results showed that the highest absolute weight growth in tilapia was found in treatment D (8 mL probiotics) which was 2.04 g, the specific growth rate was (2.86% / day), and the feed conversion ratio produced (1.57), while the survival rate of tilapia obtained during maintenance was (80.00-84.00%).

Abstract The seaweed market opportunity is very promising, this condition is in line with the national plan which positions Indonesia as the largest seaweed producer in the world. Seaweed production in Central Sulawesi, especially in Morowali district, has continued to decline since 2012-2021. The aim of the research was to examine the distribution of nitrates and phosphates in sea water, sediment and seaweed at seaweed cultivation sites around mining sites in Morowali District which is suspected to be the cause of this situation. Observation stations include South Bungku Waters, Bahodopi Waters, Witaponda Waters and Bumi Raya Waters. The results showed different nitrate and phosphate contents in sea water, sediment and seaweed. The nitrate content in waters throughout Morowali district ranged from 0.071 to 0.202 ppm, and phosphate from 0.001 to 0.013 ppm. The nitrate content in the sediment was in the range of 2.67-8.15 ppm and phosphate was in the range of 0.001-3.03 ppm. Meanwhile, the nitrate and phosphate content in seaweed was from 20.36 to 40.68 ppm and 1.39 to 8.37 ppm respectively. The data showed that the highest nitrate and phosphate content was in seaweed tallus, followed by sediment and the lowest nitrate and phosphate content in sea water. This indicates that the nitrate content of seawater, sediment and seaweed has exceeded the tolerance threshold for seaweed growth. However, the phosphate content in seawater was still relatively low, while in sediment and seaweed tallus has exceeded the threshold.

Dampelas Lake, also known as Talaga Lake, in Central Sulawesi Indonesia, lacks data on fish communities, especially biological aspects, including a wild population of bonylip barb Osteochilus vittatus (Valenciennes, 1842). Locally known as ikan nilem, this freshwater fish commodity is not native to Sulawesi. The purpose of this research was to analyze the length-weight relationship, condition factor and DNA barcode of the bonylip barb population in Dampelas Lake. Bonylip barb specimens (101 males and 78 females) were collected from Lake Dampelas during July 2023 using fish traps. The total length and weight ranges were 57-211 mm and 3-107 g. Length-weight relationships were W = 3×10-5 L2,8219 (males); W = 3×10-6 L3,2574 (females); and W = 1,1×10-5 L3,0176 (both sexes combined), indicating an isometric growth pattern. Condition factor ranged from 0.471-1.652 with similar mean values for males (1.01) and females (1.02). DNA barcodes for Lake Dampelas bonylip barbs nested in one of four O. vittatus clades, indicating a need for reviewing Osteochilus taxonomy. Most adult females had spent gonads, indicating seasonal spawning, with implications for developing an economically viable fishery which could also help control this non-native species in Dampelas Lake.Keywords: Cyprinidae, freshwater fisheries, growth pattern, introduced fish, mitochondrial DNA