AQUASAINS

Analisis Mikroplastik pada Saluran Pencernaan dan Insang Ikan Petek (Leiognathus splendens) di Sungai Remu Papua Barat Daya

Nurfitri Rahim, Siti Hajaria Kilwo

Mikroplastik merupakan salah satu polutan yang menjadi perhatian global karena berdampak buruk terhadap organisme akuatik dan kesehatan manusia. Penelitian ini bertujuan untuk menganalisis keberadaan mikroplastik pada saluran pencernaan dan insang ikan petek (Leiognathus splendens) yang ditangkap di Sungai Remu, Kota Sorong, Papua Barat Daya. Pengambilan sampel dilakukan di tiga stasiun berbeda menggunakan metode purposive sampling. Identifikasi mikroplastik dilakukan dengan metode digesti menggunakan larutan KOH 10%, kemudian diamati di bawah mikroskop stereo. Hasil penelitian menunjukkan bahwa total mikroplastik yang ditemukan terdiri atas empat jenis, yaitu fiber, film, fragmen, dan pellet. Fiber merupakan jenis yang paling dominan dengan jumlah 11 partikel, diikuti oleh film (10 partikel), fragmen (2 partikel), dan pellet (1 partikel). Distribusi mikroplastik pada organ menunjukkan bahwa usus lebih banyak mengandung mikroplastik dibandingkan insang, terutama di stasiun hilir. Pola spasial mengindikasikan bahwa jumlah mikroplastik meningkat dari hulu ke hilir, sejalan dengan meningkatnya aktivitas antropogenik di sekitar sungai. Hasil ini memperkuat bukti bahwa Sungai Remu telah mengalami pencemaran mikroplastik yang cukup serius, yang dapat menimbulkan risiko ekologis bagi biota perairan maupun kesehatan manusia yang mengonsumsi ikan dari perairan tersebut.

PENENTUAN KUALITAS BENIH BERDASARKAN HUBUNGAN PANJANG DAN BERAT YUWANA IKAN KERAPU CANTANG DALAM FASE PENDEDERAN RECIRCULATING AQUACULTURE SYSTEM (RAS

Jeremy Saut Raya Tuah Saragih

This study aimed to analyze the length-weight relationship and identify the growth pattern of juvenile hybrid grouper (Epinephelus fuscoguttatus × Epinephelus lanceolatus) during the nursery phase in a Recirculating Aquaculture System (RAS).The research employed a sample size of 95 juveniles for each of the two size groups (10 cm and 11 cm). The 10 cm group exhibited a mean total length of 107.10 mm and a mean weight of 20.77 g, while the 11 cm group had a mean total length of 117.44 mm and a mean weight of 30.31 g. Linear regression analysis demonstrated a negative allometric growth pattern in both groups, indicating that length growth was more pronounced than weight gain. The coefficients of determination (R2) were 0.420 for the 10 cm group and 0.642 for the 11 cm group, suggesting that 42% and 64.2% of the variation in body weight, respectively, was attributable to changes in body length. Throughout the study, environmental water quality parameters were maintained within the optimal range as specified by the Indonesian National Standard (SNI). In conclusion, although the juveniles demonstrated negative allometric growth, the RAS proved effective in sustaining a favorable rearing environment. Further research encompassing different developmental stages is recommended to achieve a more comprehensive understanding of the species' growth dynamics.

Analisis Kelayakan Finansial Udang Vaname di Desa Bratasena Adiwarna Kecamatan Dente Teladas Kabupaten Tulang Bawang

Rafiqah Amany Rele

Udang vaname dari sudut pandang ekonomi memiliki prospek dan laba yang menguntungkan meskipun seringkali mengalami tantangan finansial dan teknis yang lebih besar. Penelitian ini bertujuan mengidentifikasi dan mengkaji alasan petambak masih bertahan dan tetap melakukan budidaya udang vaname serta menganalisis kelayakan finansial dan sensitivitas usaha budidaya udang vaname. Penelitian ini menggunakan metode studi kasus yang dilakukan di Desa Bratasena Adiwarna, Kecamatan Dente Teladas, Kabupaten Tulang Bawang pada Bulan Januari sampai Februari 2025. Responden dalam penelitian ini berjumlah 70 orang petambak menggunakan metode proportional random sampling. Penelitian ini menggunakan metode analisis kelayakan finansial meliputi NPV, Net B/C, Gross B/C, Payback Period, IRR, dan analisis sensitivitas, serta analisis deskriptif kualitatif meliputi faktor internal dan eksternal. Hasil penelitian menunjukkan bahwa alasan terbanyak yang mendasari petambak masih membudidayakan udang vaname karena komitmen pada usaha. Penelitian ini menunjukkan bahwa budidaya udang vaname memberikan nilai NPV sebesar Rp828.872,784, IRR sebesar 74,85 persen, Gross B/C sebesar 1,57, Net B/C sebesar 9,24, Payback Period sebesar 4,78. Budidaya udang vaname masih layak diusahakan apabila terjadi penurunan harga jual udang vaname sebesar 15 persen, kenaikan biaya pakan sebesar 20 persen, dan penurunan produksi sebesar 28 persen.

STUDY ON WATER QUALITY AND POLLUTION CAPACITY OF SILANDAK RIVER, SEMARANG

Berliana Putri Debora, Siti Mira Rahayu, Ratna Suharti, Iya Purnama Sari

The Silandak River has a function as a water supplier in agricultural irrigation and drainage systems to reduce flood risk. The water quality of the Silandak River is declining due to household waste, factory waste, fish pond activities, and fishing boats that disrupt the ecosystem. This study aims to analyze the level of pollution and the carrying capacity of the pollution load in the Silandak River. This research was conducted in July-September. Sampling was carried out at six stations that are suspected of having the potential to experience pollution. The results of the water quality analysis of the Silandak River show that the values of TSS, nitrite, total phosphate, BOD, COD, and DO are not under the class II water quality standards of Government Regulation No. 22 of 2021, while the values of TDS, nitrate, and ammonia still meet the quality standards. The results of the Pollution Index (IP) analysis at Stations I, II, III, and VI are in moderate pollution conditions while Stations IV and V are in heavy pollution conditions. The river capacity for TSS, nitrite, phosphate, BOD, COD, and DO parameters has exceeded the pollutant quota at each observation station. Meanwhile, for the parameters of TDS, nitrate, and ammonia, it is still in the pollutant quota so it is still in the safe category. Pollution that occurs in the Silandak River is associated with high COD and BOD parameters. This is caused by domestic waste and factory industry inputs to the river.

A Performance Evaluation of Vannamei Shrimp (Litopenaeus vannamei) Cultivation in Intensive Fermentation-Based Systems CV 58 in Bali Utara

Vetricia Monalisa Manurung, Ni Nyoman Dian Martini, Gede Ari Yudasmara

Intensive vannamei shrimp (Litopenaeus vannamei) farming using a fermentation-based system offers an innovative solution to environmental management and production efficiency. This study was conducted over one cultivation cycle (80 days) in six ponds operated by CV Tambak 58, North Bali, integrating periodic probiotic fermentation. Key parameters evaluated included growth (ABW, ADG), feed efficiency (FCR), survival rate (SR), water quality, and microbiological stability. Results showed high productivity (up to 2.53 kg/m2), low FCR (1.13–1.40), and SR >85%, accompanied by stable planktonic and microbial communities. These findings indicate that fermentation-based systems reduce environmental stress and disease risks while enhancing the sustainability of intensive shrimp aquaculture.

EVALUASI KINERJA BUDIDAYA UDANG VANAME (LITOPENAEUS VANNAMEI) PADA SISTEM INTENSIF BERBASIS FERMENTASI CV 58 DI BALI UTARA

Vetricia Monalisa Manurung

Intensive vannamei shrimp (Litopenaeus vannamei) farming using a fermentation-based system offers an innovative solution to environmental management and production efficiency. This study was conducted over one cultivation cycle (80 days) in six ponds operated by CV Tambak 58, North Bali, integrating periodic probiotic fermentation. Key parameters evaluated included growth (ABW, ADG), feed efficiency (FCR), survival rate (SR), water quality, and microbiological stability. Results showed high productivity (up to 2.53 kg/m²), low FCR (1.13–1.40), and SR >85%, accompanied by stable planktonic and microbial communities. These findings indicate that fermentation-based systems reduce environmental stress and disease risks while enhancing the sustainability of intensive shrimp aquaculture.

THE EFFECT OF ADDING VITAMIN C TO COMMERCIAL FEED ON THE GROWTH AND SURVIVAL OF CANTANG GROUPER FISH

Nyoman Trisna Wahyu Maria Dewi

This study was conducted to scientifically evaluate the effect of vitamin C supplementation in commercial feed on the growth performance and survival rate of cantang grouper (Epinephelus fuscoguttatus × E. lanceolatus), a high-value aquaculture commodity in Indonesia. The experimental design employed was a Completely Randomized Design (CRD) with three treatments: commercial feed without vitamin C (control), feed supplemented with 20,000 ppm of vitamin C, and feed supplemented with 40,000 ppm of vitamin C, each with three replicates. The key parameters observed included weight gain, specific growth rate (SGR), and survival rate (SR) of the fish during a 30-day rearing period. The results revealed that the addition of vitamin C to the commercial feed had a statistically significant effect on both weight gain and SGR (p < 0.05), where the 40,000 ppm treatment produced the highest mean weight gain (7.12 grams) and SGR value (0.0765%). Although survival rate did not differ significantly among treatments (p > 0.05), the group receiving 40,000 ppm of vitamin C still achieved the highest survival rate of 100%. Water quality parameters, including temperature, pH, salinity, dissolved oxygen, and ammonia, remained within optimal ranges throughout the experiment in accordance with marine aquaculture standards. Based on these findings, it can be concluded that vitamin C supplementation, particularly at a concentration of 40,000 ppm, is highly effective in promoting growth performance and maintaining high survival rates of cantang grouper under controlled aquaculture conditions.

A REVIEW OF PHYTOPLANKTON AS A GLOBAL CLIMATE CONTROLLER

Gede Agus Surya Pratama

Climate change and global warming are currently major topics being tackled in international forums. This paper was written using a literature review methodology. A literature review is a national or worldwide literature search that is conducted with multiple sources of information to bolster the writing that is being done. The process involves reading through, summarizing, and considering the author's perspective on a number of library resources (books, articles, the internet, and other sources). Findings: The marine and fisheries industry is particularly affected by climate change, with fishermen suffering the most as a result of unpredictable weather and waves that prevent them from going to sea. Coastal towns are also susceptible to climate change-related disasters. The main benefit of phytoplankton is that it helps mitigate the severe effects of climate change. The availability of an enormous amount of O2, which may have a favorable effect, is the advantage we can sense

ANALISIS RESIDU PADA BUDIDAYA UDANG VANNAMEI (Litopenaeus vannamei) DI KABUPATEN TUBAN

Ardiani Utomo Putri

Food safety is a crucial aspect of vannamei shrimp (Litopenaeus vannamei) aquaculture, particularly regarding the use of chemicals that may leave harmful residues. This study aims to analyze the compliance of chemical usage in vannamei shrimp farming in Tuban Regency with food safety standards. Data were collected through interviews with farmers and fish health analysts, as well as laboratory testing of shrimp samples from several pond locations. The analysis results showed that all samples from the tested sites were compliant, meaning they met the permitted residue limits. Therefore, it can be concluded that shrimp farming practices in this region have been carried out responsibly and in accordance with prevailing safety standards. This study may serve as a reference for the development of guidance and monitoring efforts toward sustainable shrimp farming in other regions.

ANALISIS PENGARUH PEMBERIAN PROBIOTIK Bacillus sp. DENGAN DOSIS YANG BERBEDA TERHADAP KELANGSUNGAN HIDUP LARVA IKAN KAKAP PUTIH (Lates calcarifer)

Ida Ayu Sawitri Dewita Sari, Ida Bagus Jelantik Swasta, Jasmine Masyitha Amelia

This study aims to analyze the effect doses of Bacillus sp. Probiotics on the survival rate of white snapper (Lates calcarifer) larvae. The research was conducted at the Gondol Research Institute for Mariculture, Bali, over a 20-day period using a Completely Randomized Design (CRD) with three treatments and three replications: P0 (control, without probiotics), P1 (3 mg/L), and P2 (5 mg/L). Observed parameters included water quality (nitrate, nitrite, ammonia, phosphate, temperature, pH, salinity, DO), total bacterial count (TBC), survival rate (SR), larval length, and hatching rate (HR). The results showed that the administration of Bacillus sp. probiotics had a significant effect on the survival rate of white snapper larvae (p < 0.05). Based on ANOVA, there were significant differences in SR between treatments. The Bonferroni post hoc test revealed that treatment P2 (5 mg/L) was significantly different from both the control (P0) and P1 (3 mg/L), with P2 producing the highest average SR of 84%, compared to P1 at 70.3% and the control at 50.3%. Meanwhile, probiotic administration did not have a significant effect (p > 0.05) on water quality parameters or larval length. The highest larval length was also recorded in treatment P2, with an average of 1.5 cm on day 20. The use of probiotics contributed to the reduction of toxic compounds such as nitrate, nitrite, and ammonia, and helped stabilize the rearing water environment. Based on these results, it can be concluded that the administration of Bacillus sp. probiotics at a dose of 5 mg/L is the optimal dosage for improving the survival rate of white snapper larvae and maintaining the quality of the aquaculture environment.

Keywords Bacillus sp., probiotics, survival rate, larvae, white snapper, water quality