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Strategi Pengelolaan Ekowisata Mangrove Berbasis Konservasi pada Objek Wisata Alam Trekking di Tahura Ngurah Rai, Bali Atsna Qi Doma T. Manihuruk; I Wayan Restu; I Wayan Darya Kartika
Current Trends in Aquatic Science Vol 4 No 2 (2021)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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The aim of this research was to explain the legal aspects of trekking nature tourism object, to determined the zones of this place existence and to explain the strategies management of mangrove ecotourism in trekking nature tourism object. The methods of this research were using survey, purposive sampling and accidental sampling. The data were analized using a content analysis and SWOT analysis. The results indicates that the development of that place has already been legal as the tourist attraction. This statement is according to the decree of the Minister of Forest Number 544/Kpts-II/1993 on September 25, 1993. The development of this place is also on the right zone, the place is located in the utilization zone. And, this research resulted 6 strategies namely; improved the infrastructure and providing dustbins, toilet revitalitation and reconstruction the bridges, conduct waste management with an integrated system which is based on community management that involved people around the place, increasing the diversification of tourist attraction objects, increasing the promotion by joining the tourism developers. The last but not least, is about issuance of PERDA (Peraturan Daerah) to control and made an ideal price for tickets, and improved the human resource management.

Profil Nutrien Nitrat dan Fosfat pada Air di Sungai Jangga, Karangasem, Bali Syahriyani Purba; Ima Yudha Perwira; Dewa Ayu Angga Pebriani
Current Trends in Aquatic Science Vol 4 No 2 (2021)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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Jangga river is one of the rivers in the Bali and has important ecological function. On the other hand, the jangga also became a waste-disposal of anthropogenic activities surround the river. That could an affect to increase content of nitrate and phosphate was found in Jangga river. This study was aimed to identify the concentration of nitrate and phosphate in the water of Jangga river. This study was conducted in a descriptive method by taking samples five stations from January to February 2020. The main parameters measured are Nitrate, phosphate and other water quality parameters (turbidity, temperature, pH, TDS, TSS, DO, COD and chromium). The result of this study showed that nitrate levels were high. The value of nitrate ranged from 5.3 mg/L to 7.6 mg/L. Parameter of phosphate was found in the Jangga river is also high. The value of phosphate ranged from 0.7 mg/L to 1.3 mg/L These are affected by the sewage from anthropogenic activities was found around the Jangga river including detergent and waste from agricultural and fisheries activity around the Jangga river.

Profil Kandungan Fosfat pada Air di Daerah Aliran Sungai (DAS) Tukad Ayung, Bali Novita Wulandari; Ima Yudha Perwira; Ni Made Ernawati
Current Trends in Aquatic Science Vol 4 No 2 (2021)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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Ayung River is the longest river in the Bali Island. There are a lot of antropogenic activities around this area. However, there is lack information about the nutrient (Phosphate) level in the water of this river. This study was aimed to observe the amount of nutrient (Phosphate) in the water of Ayung River. Water sampling was carried out in the upstream, middle stream, and downstream of Ayung River from December 2019 to January 2020. The phosphate amount was measured using Hanna HI713 reagent, Dissolved Oxygen (DO) of water was measured using Winkler method, pH of water was measured using digital pH meter, and water temperature was measured using Thermometer. The result showed that phosphate of the water was ranging from 0.3 to 0.9 mg/L. The amount of phosphate tends to be higher in the evening (0.9 mg/L) compared to that in the morning time (0.4 mg/L). The phosphate increase rate of middle stream to the downstream was higher (0.011 mg/L.km) compared to that of upstream to the middle stream (0.009 mg/L.km).

Kandungan Nitrat dan Fosfat pada Air di Sungai Telagawaja Kabupaten Karangasem, Bali Deta Miriam Br Sitepu; Ima Yudha Perwira; I Wayan Darya Kartika
Current Trends in Aquatic Science Vol 4 No 2 (2021)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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This study measured the amount of nitrates and phosphates in thewater of Telagawaja river. The water of this river is used for hygiene sanitation necessity of the people living in the surrounding area. Many antropogenic activities are exists in this area, such as: rafting and hotel, farming, and animal husbandry. This study aimed to know the status of nitrate and phosphate nutrient in the water based on the Indonesia Government Regulation Number 82 of 2001. The amount of nitrate was measured using Salifert Nitrate KIT, while phosphate was measured using Hanna HI 713 KIT. Measurement was also carried out on the total organic matter, dissolved solid, suspended solid, turbidity, dissolved oxygen, water acidity (pH), and temperature. The results showed that amount of nitrate (0.2-0.9 mg/L) and phosphate (0.1-0.4 mg/L) in the water of Telagawaja River was below the tolerance limit for all of usage class. The water of the center and the downstream might be used for fish culture, animal husbandry, irrigation water, and other usages in this standard.

Produksi dan Pertumbuhan Ikan Lemuru (Sardinella lemuru) yang Didaratkan di PPI Kedonganan, Bali Indah Nurtira; I Wayan Restu; Made Ayu Pratiwi
Current Trends in Aquatic Science Vol 4 No 2 (2021)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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Lemuru fish resource is one of the fish resources which has important economic value and is of interest to the wider community. Therefore, this resource has been exploited intensively in the Bali Strait and has become the backbone of fishery business activities in the waters. This research was conducted in November-February 2021 at PPI Kedonganan, Bali. This study aims to analyzed the production and growth of Lemuru fish which includes trend analysis and catch composition, growth patterns, length frequency distribution, age groups, and growth parameters of Lemuru Fish. This study found that lemuru fish in PPI Kedonganan had trend an increasing of 99%. Primary data collection in this study, such as measurement of length and weight, was carried out with time intervals of ± 14 days. Lemuru fish that were measured were 600 fish which had a range of 100.2-158.3 mm. Fork lengths ranged from 114.2 to 120.2 mm, consisting of 3 age groups separated by the NORMSEP method using software FISAT II. The shift of the age group to the right 2 times showed that there is growth in the Lemuru fish stock. Based on the length and weight analysis, the results of the analysis of the growth pattern of Lemuru Fish are negative allometric, where the length gain is faster than the weight gain. Lemuru fish has an asymptotic length of 179.6312. This showed that the asymptotic length of Lemuru Fish continues to decrease every year, presumably due topressure overfishing which causes the fish caught to be smaller.

Evaluasi Kualitas Air dan Kondisi Lingkungan pada Lokasi Budidaya Rumput Laut (Eucheuma cottonii) di Perairan Pantai Pandawa, Bali Devita Eka Saputri; Ima Yudha Perwira; Ayu Putu Wiweka Krisna Dewi
Current Trends in Aquatic Science Vol 4 No 2 (2021)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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This research aimed to observe water quality and environmental conditions in the location of seaweed (Eucheuma cottonii) cultivation area in Pandawa Beach Waters. The research was conducted from December 2019 to January 2020. Water sampling was carried out at 3 different stations in the west side of Pandawa Beach Waters. Measuring temperature using a thermometer, salinity using a refractometer, water pH using a pH meter, and Dissolved Oxigen (DO) of water were measured using the Winkler method. Nitrate and phosphate in the water was measured using Salifert KIT. The result showed that water temperature was raning from 28.7 to 30oC, salinity was from 30 to 31 ppt, pH was from 7.5 to 7.66, and DO was from 5.60 to 6.03 mg/L. Analysis of nitrate showed range from 1.52 to 1.77 mg/L, while phosphate was ranging from 0.22 to 0.32 mg/L. These results showed that water quality in the location is suitable for the cultivation of seaweed.

Profil Kandungan dan Kelimpahan Mikroplastik pada Ikan Kakap Merah (Lutjanus sp.) yang Didaratkan di PPI Kedonganan, Bali Gebi Gresi Martina Panjaitan; Ima Yudha Perwira; Ni Putu Putri Wijayanti
Current Trends in Aquatic Science Vol 4 No 2 (2021)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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This study aimed to determine the microplastic content and abundance on the stomach of Red Snapper (Lutjanus sp.) landed at Kedonganan Fishery Port (PPI), Bali. This study was conducted at The Kedonganan Fishery Port (PPI), Bali from November to December 2019. The fish samples used were: Lutjanus Malabaricus and Lutjanus Gibbus. The microplastic particles were extracted from the gut of the fish before analysis (type and amount of particles). The result showed that 77% of Red Snapper (Lutjanus sp.) landed at the PPI Kedonganan were contaminated by microplastics particles. The abundance of microplastics in Lutjanus malabaricus species was 7.86 particle/fish, while in the Lutjanus gibbus species was 4.46 particle/fish. The advances analysis showed that there were 3 types of microplastic particles found in this study: fragments (75 particles), film (45 particles), and fiber (65 particles).

Rasio Konversi Pakan, Pertumbuhan dan Kelulushidupan Ikan Lele (Clarias Sp.) yang Diberi Pelet Komersial dan Maggot BSF Black Soldier Fly (Hermetia Illucens) I Kadek Alamsta Suarjuniarta; Pande Gde Sasmita Julyantoro; I Wayan Darya Kartika
Current Trends in Aquatic Science Vol 4 No 2 (2021)
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 feed conversion ratio, weight growth and survival rate of Catfish (Clarias sp.) fed with commercial feed and the black soldier fly larvae (Hermetia illucens). The study was conducted from February-March 2021 located at PT Bala Biotech Indonesia, Karangasem, Bali. This study used an experimental method with a completely randomized design consisting of 3 treatments and 3 repetitions. The treatment A used 100% commercial feed, treatment B used 50% commercial feed + 50% BSF larvae and the treatment C used 100% BSF larvae. The result showed that the fish survival was 33±2.89%, weight growth 35.0±1.89g and FCR 0.67 in the treatment A, while treatment B resulted in 35±5.00% of survival, weight growth 33.6±0.85g and FCR 0.82, treatment C had 47±2.89% survival 18.7±1.89 g weight growth and FCR 1.12. The water quality parameters measured such as DO was ranged at 6.6-7.4 mg/l, temperature 25.8-25.9 oC, pH 6.9-7.0, ammonia level 0.7-1.4 mg/l, nitrite level 0.1-0.6 mg/l and nitrate level 3.0-5.3 mg/l. This study concluded that fish fed with 100% maggot BSF resulted in highest fish survival but the fish growth was lower compared to other treatments. Finally FCR in all treatments were not significantly different (P>0.05).

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.

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Journal Mail Official
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Location
Kota denpasar,

Bali

INDONESIA