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Laju Pertumbuhan dan Kelulushidupan Ikan Lele Dumbo (Clarias gariepinus) dengan Padat Tebar Berbeda dalam Sistem Bioflok Dian Kharisma Ginting; Pande Gde Sasmita Julyantoro; Ni Putu Putri Wijayanti
Current Trends in Aquatic Science Vol 5 No 1 (2022)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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Biofloc technology is used to overcome the increase in organic matter, improve the quality of aquaculture water, and increase production yields. This study aims to determine the growth rate and survival rate of African catfish with different stocking densities in the biofloc system. This study used a completely randomized design (CRD) with 3 treatments and 5 replications. The test animals used African catfish measuring 7-9 cm with a stocking density of A (15 ind/15L), B (20 ind/15L) and C (25 ind/15L). The results showed that the use of a biofloc system in African catfish culture with different stocking densities resulted in no significant difference in growth rate, survival rate (SR) and feed conversion ratio (FCR). The average weight growth value of African catfish in treatment A, B, and C was 14,13 ± 2,26 g, 13,37±0,46 g, and 12,04±0,48 g, respectively. The average length growth in treatments A, B, and C was 6,27±0,54 cm, 6,09±0,31 cm, and 5,69±0,34 cm, respectively. The survival value (SR) of African catfish in treatment A, B, and C was 85,33±5,58%, 83±2,73%, and 82,40±2,19%, respectively. The value of the feed conversion ratio (FCR) in treatment A, B, and C was 0,72±0,08, 0,75±0,06, and 0,79±0,03, respectively. The range of values for the water quality parameters of the culture media is categorized as suitable for the growth of African catfish, resulting in temperature, DO, and pH value of 27,5-30,8°C, 3,9-5,9 mg/L, pH 6,20-6,45, respectively. The content of ammonia is 0,26-0,44 mg/L, nitrite is 0,08-0,18 mg/L and nitrate is 0,18-0,29 mg/L.

Tingkat Dekomposisi Bahan Organik pada Sedimen di Tukad Daya Desa Bungkulan Kabupaten Buleleng, Provinsi Bali Dresti Ngurah Dwi Saputra; Ima Yudha Perwira; Alfi Hermawati Waskita Sari
Current Trends in Aquatic Science Vol 5 No 1 (2022)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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The purpose of this study were to know decomposition rate in the sediment, the ratio of C/N, and the supporting parameters (Ammonia, Nitrate and pH) in the sediment in Daya River. Sediment samples were taken from 6 points in Daya River by purposive sampling. Sediment samples were analyzed for organic carbon, total nitrogen, total bacterial number, ammonia, nitrate, and pH. The results showed that organic carbon content in the sediment was 27.96%, total nitrogen content was 1.12%, and total bacterial number was 7.1 x105 CFU/ml. Based on this result, the C/N ratio is around 28.71 indicating balance condition of decomposition. The average value of ammonia, nitrate and pH were: were 1.21 mg/L, 0.92 mg/L, 7.39, respectively. The supporting parameters in Daya River are pH and Nitrate in the sediment in Tukad Daya in optimal conditions to support the decomposition of organic matter in Daya River. Ammonia in the sediment in Daya River exceeds the optimal limit for living organisms during the decomposition process of organic matter.

Penilaian Kondisi Teknik Penangkapan Ikan Lemuru (Sardinella lemuru) Berdasarkan Pendekatan EAFM di PPI Kedonganan, Bali Atanasius Jenarut; Nyoman Dati Pertami; Made Ayu Pratiwi
Current Trends in Aquatic Science Vol 5 No 1 (2022)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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Ecosystem Approach to Fisheries Management (EAFM) is a management concept through an integrated and ecosystem-based approach. This study aimed to describe the condition of Bali Sardinella (Sardinella lemuru) at Kedonganan Fish Port and assess the management of this species based on the EAFM fishing technique domain. The assessment method refers to the methodology used by the National Working Group on EAFM, Directorate of Fish Resources, Ministry of Marine Affairs and Fisheries of Republic Indonesia, 2014. Data analysis used a Likert score based on ordinal 1, 2, 3 against indicators such as destructive/illegal fishing methods, modification of fishing gear, fishery capacity and fishing effort, fishing selectivity. Then, function suitability indicators and size of the ship is fishing boat crew certification adjusted to the status of Kedonganan fish port. Kedonganan fish port was a small- scale fishery. The scores obtained for each indicator was destructive/illegal fishing methods get a score of 2, modification of fishing gear get a score of 1, while indicators of fishery capacity and fishing effort and fishing selectivity get a score of 3. Lemuru fisheries management at Kedonganan fish port technical classified as good with the composite value of 69.

Jumlah Total Bakteri dan Nutrien Nitrogen Pada Sedimen Mangrove Taman Hutan Raya (TAHURA) Ngurah Rai, Bali Hanna Santika Tinambunan; Ima Yudha Perwira; Ni Made Ernawati
Current Trends in Aquatic Science Vol 5 No 1 (2022)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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This research aims to find out the total amount of bacteria and nitrogen nutrients found in mangrove sediments in Ngurah Rai Forest Park (TAHURA), Bali. Sampling was conducted in 4 locations, namely from estuary Mertasari, estuary Tukad Mati, estuary Jimbaran, and Nuda Dua, where 1 location consists of 3 sampling points. The research was conducted at the Fisheries Laboratory of the Faculty of Marine and Fisheries of Udayana University in December 2020. The research phase is to prepare research materials, take measurements of ammonia, nitrates, total bacteria, pH, TDS, and electrical conductivity (EC). Measuring pH and TDS/EC using a pH meter and TDS/EC meter. Determining the total number of bacteria using the Total Plate Count. The results showed that the total number of bacteria by 33 × 107 CFU / g and while in nitrogen nutrients obtained from several parameters that have a result in nitrates of 2.8 mg / L, ammonia of 21.5 mg/L, dissolved solids (TDS) of 2100 mg/L,acidity (pH) of 6.6,electrical conductivity (EC) of 4259 ?S/cm. The fertility of mangrove ecosystem in Ngurah Rai Bali Forest Park (TAHURA) can be known from the measurement of physical and chemical parameters in sediment that has been done. Where the content of nitrogen nutrients, such as in the parameters of ammonia and nitrate content contained in mangrove sediment is not classified as polluting the waters because it is still in the category of safe, where the material of organik in sediment can be a source of fertility for mangrove growth.

Aspek Biologi Reproduksi Ikan Tongkol Krai (Auxis thazard Laceoede, 1800) di Perairan Kedonganan, Badung Bali Ni Luh Kade Putri Purwaningsih; Nyoman Dati Pertami; Made Ayu Pratiwi
Current Trends in Aquatic Science Vol 5 No 1 (2022)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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Frigate tuna is one type of small pelagic fish that belongs to the neritic tuna (15-30 mil). This study aimed to determine the reproductive biology aspects of frigate tuna (Auxis thazard). Reproductive biology aspects can be identified by observing the sex ratio, gonad maturity level gonadal maturity index, fecundity and the size of the first gonadal maturity. Sampling was carried out in January – March 2021 with a span of 14 days at the Kedonganan Fish Landing Base. Samples were obtained from local fishermen who do one day fishing. The total fish samples observed during the study were 161 males and 174 females (335 individuals). The sex ratio of male and female tuna is 1:0.9 and is stated to be in a balanced condition. Furthermore, the gonad maturity level, during the study was dominated by levels II and III, with the gonad maturity index of male fish ranging from 6.25 to 8.31 and female fish 6.26 to 8.91. The spawning period for tuna krai in Kedonganan waters occurs in January-March and the peak of spawning occurs in March. The fecundity of krai cobs ranged from 75107 to 750470 grains (average 201.463 grains). The size of the gonads at first maturity of male krai tuna was slower than that of female tuna (321 and 336 in mm).

Pemberian Pelet FF-999 dengan Dosis Berbeda terhadap Pertumbuhan, Rasio Konversi Pakan dan Kelulushidupan Benih Ikan Nila (Oreochromis Niloticus) pada Sistem Batch Jefri Boy Pratama; Pande Gde Sasmita Julyantoro; Ni Putu Putri Wijayanti
Current Trends in Aquatic Science Vol 5 No 1 (2022)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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The purpose of this study was to determine the effect of giving FF-999 pellets with different doses on growth, feed conversion ratio (FCR), survival rate (SR) and water quality of tilapia seeds. This research was conducted at the Fisheries Laboratory, Faculty of Marine Affairs and Fisheries, Udayana University from January-February 2021. Fish samples tested were tilapia seeds (Oreochromis niloticus) obtained from UD. Mina Karya Jaya, Karangasem, Bali. Feed used in this study was FF-999 pellets. Method used is an experimental using a completely randomized design with 5 treatments and 3 repetitions. Doses of feed given in this study were in treatment A was 1%, treatment B was 2%, treatment C was 3%, treatment D was 4%, and treatment E was 5%. Results of observations for 8 weeks showed the highest absolute length and weight growth was found in treatment E, was 4.50 cm and 4.34 g. Lowest feed conversion ratio was found in treatment C was 0.81. Highest survival rate was found in treatments C and D, was 73.33%. Results of statistical analysis One-Way ANOVAwith Duncan's follow-up test showed different treatments had significant effect on absolute length and absolute weight growth, survival rate tilapia (P<0.05) and had no significant effect on feed conversion ratio tilapia (P>0, 05). Water quality parameters measured include temperature, pH, Dissolved Oxygen (DO), ammonia, nitrate, nitrite, and phosphate in all treatments was still considered feasible for growth and survival of tilapia seeds (O. niloticus).

Keanekaragaman dan Asosiasi Antarspesies Lamun di Perairan Pantai Samuh, Nusa Dua, Bali Ayu Padma Sari; Nyoman Dati Pertami; Made Ayu Pratiwi
Current Trends in Aquatic Science Vol 5 No 1 (2022)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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Seagrass are flowering plants which have rhizomes, leaves and true roots. Most types of seagrass in Indonesia are found in Bali. One of the distributions of seagrass in Bali is Samuh Beach. This study aimed to determine the diversity of seagrass and association patterns between seagrass in Samuh Beach. This research conducted on January-February 2021. There were three observation stations, namely station I (fishing boat landing sites), station II (tourist activities), and station III (hotel area locations). The method used in this research was descriptive method Observation of seagrass samples using a 50×50 cm quadratic transect. Data analysis was carried out by calculating density, cover percentage, diversity index, uniformity index, dominance index, and associations between seagrass species. There were eight types of seagrass in Samuh Beach (Enhalus acoroides, Cymodocea rotundata, Cymodocea serrulata, Halodule pinifolia, Halodule uninervis, Halophila ovalis, Syringodium isoetifolium, and Thalassodendron ciliatum). The diversity of seagrass in Samuh Beach from observations at stations I and II in balanced conditions with a value of 1.42 and 1.52. Station III was a low category (0.79). There were 14 association pairs species of seagrass in Samuh Beach. The 12 association pairs were not related and 2 association pairs were related at the 5% level, (3.48, ?2 count> ?2 table). The related association pairs have positive association types, namely Syringodium isoetifolium with Halophila ovalis and negative associations, and Syringodium isoetifolium with Halodule pinifolia.

Pengaruh Derajat Keasaman (pH) terhadap Pertumbuhan Bakteri Toleran Kromium Heksavalen dari Sedimen Mangrove di Muara Tukad Mati, Bali Ibnu Fajar; Ima Yudha Perwira; Ni Made Ernawati
Current Trends in Aquatic Science Vol 5 No 1 (2022)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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The acidity (pH) is an important factor in bacterial growth, this affects the high and low density of the bacteria produced. The minimum and maximum pH values for bacterial growth are generally 4-9, but the optimal pH ranges from 6.5-7.5. This research aims to determine the effect of pH on the growth of hexavalent chromium or Cr(VI) tolerant bacterial isolates from mangrove sediments in Muara Tukad Mati. This research was conducted at the Laboratory of Fisheries, Faculty of Marine Affairs and Fisheries, Udayana University in March 2021. The method used in the research was the experimental method by giving four different pH treatments, namely pH 3, 5, 7, and 9. The stages of the study included preparation of the research sample, creation of growth media, preparation of inoculum, and measurement of growth of bacterial isolates, then analyzed descriptively in the form of pictures and graphics. It is known that the five bacterial isolates can grow well in a pH range of 5-7. Bacterial isolate A reached the optimal value at pH 7, while bacterial isolate B, C, D, and E reached the optimal value in the pH range 5-7. Based on the range of pH values in the growth media, the five bacterial isolates were included as acidophilic microbes that were able to live at pH 5 and mesophilic microbes that were able to live at pH 5.5-8.0.

Perbandingan Kandungan Logam Berat pada Sedimen di Kawasan Hutan Mangrove Perancak dan Tahura Ngurah Rai Yosua Febriyanto; Ima Yudha Perwira; Alfi Hermawati Waskita Sari
Current Trends in Aquatic Science Vol 5 No 1 (2022)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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Mangrove ecosystem is one of the coastal ecosystems which is greatly influenced by human activities around it. The Perancak mangrove forest area has unique characteristics with the condition of its water bodies being influenced by the tides of the Bali Strait. In addition, the Tahura Ngurah Rai mangrove forest area is a mangrove area located in the city center where there are many human activities that can produce household waste, industrial waste and so on. This study aims to determine the heavy metal content of mangrove sediments and the comparison of heavy metal content of mangrove sediments. The method used in this research is descriptive method. Meanwhile, the data collection process was carried out using purposive sampling method. Samples were measured using the spectrophotometric method with the IPC tool. The results of heavy metal measurements in Perancak Mangrove sediments for Pb ranged from 30.3 mg/L and in Tahura Ngurah Rai Mangrove sediments for Pb ranged from 59,9 mg/L. While the heavy metal content of Cd not detecded. Then the heavy metal measurements in Perancak Mangrove sediments for Hg ranges from 11 mg/L and in Tahura Ngurah Rai Mangrove sediments for Pb ranged from 22,1 mg/L . The heavy metal content in the Perancak Mangrove sediment is lower than the heavy metal content in the Ngurah Rai Mangrove sediment.

Studi Perubahan Kandungan Histamin Ikan Lemuru (Sardinella lemuru) Pada Kondisi Suhu Ruang/Terbuka Wafi Ayodhya Satyadharma; Ima Yudha Perwira; I Wayan Darya Kartika
Current Trends in Aquatic Science Vol 5 No 1 (2022)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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Examination the quality of freshness of fish is important to increase the level of fish consumption (protein consumption) of Indonesian society. If the handling is not correct, the protein contained in fish will be used by microorganisms to reproduce and reduce the quality of the fish and the formation of histamine content. The purpose of this study is to determine the histamine content in sardine fish and the relationship between the histamine content in sardine fish that were left at room temperature. This research is conducted by taking sardine fish samples at PPN Kedonganan, then leaving them on a 2 hour time scale. After settling the sardine fish, the histamine content testing using the ELISA method. Histamine content in sardines (Sardinella lemuru) left for 2 hours ranges from 3.1-39.9 ppm, histamine content in sardines (Sardinella lemuru) which is left for 4 hours ranges from 30,0-40,5 ppm, and histamine content in sardines (Sardinella lemuru) which were left for 6 hours ranged from 42.1-100 ppm.The increase in histamine content in sardine fish (Sardinella lemuru) can be affected by room temperature, the longer the sardine fish is left at room temperature, the histamine content in sardine fish can increase.

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Journal Mail Official
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Kota denpasar,

Bali

INDONESIA