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INDONESIA
Current Trends in Aquatic Science
Published by Universitas Udayana
ISSN : 26217368     EISSN : 26217473     DOI : -
Core Subject : Education,
Other
Arjuna Subject : -
Articles 10 Documents
 1 
Search results for , issue "Vol 6 No 2 (2023)" : 10 Documents clear
Optimasi Suhu terhadap Pertumbuhan dan Kelulushidupan Ikan Heckel Discus (Symphysodon discus) Fiko Triajiatma; Pande Gde Sasmita Julyantoro; Alfi Hermawati Waskitasari
Current Trends in Aquatic Science Vol 6 No 2 (2023)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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Abstract

This study aims to determine the optimization of temperature on the growth and survival of discus fish. The treatments used were different temperatures at 25°C, 28°C, and 31°C. Discus fish maintenance is carried out in 3 aquariums with a size of 120 × 40 × 40 cm which have been given a filter, aeration and heater. The water used is 120 liters, which has been aerated for 24 hours with a predetermined temperature using a heater (50W) and a water change of about 25% every week. Feeding is done by the satiation method, given 3 times a day with frozen worms where after 1 hour of feeding will be done to clean the remaining feed. Sampling of water quality (pH) using manual sampling method as a supporting parameter. The test fish used in this study were 5 cm discus fish. The number of fish used was 27 fish, and measurements were taken every 15 days with 3 repetitions. Length and weight growth of discus fish increased during the study. The growth of discus fish (Symphysodon sp.) treated at 31°C was the most optimum growth with absolute length reaching 1,56 cm and absolute weight of 3,55 g compared to the 25°C and 28°C temperature treatments. The survival rate of discus fish in the 25° C, 28° C, and 31° C temperature treatments has a survival rate value of 100% and water quality that remains stable due to optimum temperature vulnerability.
Studi Kelimpahan Bintang Mengular (Ophiuroidea) di Pesisir Pantai Nyang-Nyang, Bali Yusuf Arifianto Purnomo; Devi Ulinuha; I Wayan Darya Kartika
Current Trends in Aquatic Science Vol 6 No 2 (2023)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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Abstract

The goal of this study was to determine the habitat characteristics and population density of brittle stars in coastal area of Nyang-Nyang Beach, Bali. To facilitate the process, observations were made between November and January from 3:00 p.m. to 6:00 p.m., when the tide was at its lowest. The methodology of survey and descriptive comparative approach research was used. Purposive sampling was used to determine observation and sampling locations: two stations known to be brittle star habitats were chosen as research sites. The variables observed were two: biota community structure observations of brittle star variables at the genus level, such as abundance, diversity, evenness, and dominance, which were measured using 1 x 1 m plots. Environmental water quality variables such as beach characteristics, pH, salinity, water temperature, Dyssolved Oxygen, and current velocity are observed. Microsoft Excel was used to perform data analysis calculations. According to habitat analysis, the coast of Nyang-Nyang Beach provides an ideal habitat environment for Echinodermata, particularly the Ophiuroidea class, includes brittle stars. Nyang-Nyang beach had the brittle stars density, with 24 ind/m2 recorded. With an H' value of 0.514, but it was classified as having low diversity. The evenness index value on Nyang-Nyang Beach is 0,468, and there is no dominant genus along the coast of Nyang-Nyang beach because the dominance index value on this beach is close to 0.
Kondisi Sosial Ekonomi dan Nilai Tukar Nelayan di Desa Sanur Kaja, Denpasar, Bali Ika Setiarini; I Wayan Restu; I Wayan Darya Kartika
Current Trends in Aquatic Science Vol 6 No 2 (2023)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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Abstract

Important aspects that affect the level of welfare and the economy of fishermen are the socio-economic conditions and exchange rates of fishermen. The purpose of this study was to determine the socio-economic conditions and exchange rates of fishermen in the Sanur Kaja Village. Primary data was obtained based on observations, interviews, and questionnaires on respondents (samples) by purposive sampling, which includes data on social aspects (age, education, number of family dependents, and variety of jobs) and data on economic aspects (fishery income, expenses, and non-fishery income). All data were analyzed using a qualitative and quantitative approach, namely data analysis for calculating Fishermen's Exchange Rates (NTN). Based on the data obtained, the age range of fishermen is 28 years to 61 years, with varying levels of education ranging from not having finished elementary school, elementary school, junior high school, high school, and Diploma to Bachelor with the number of family dependents ranging from 1 to 6 people. The income earned varies from < IDR. 200,000 to IDR. 750,000 with expenses starting from IDR. 100,000 to IDR. 200,000 on 1 time went to sea. Based on the calculation results, the NTN is above 1, which is 1.59. With NTN above 1, this means that fishermen are said to be able to fulfill their basic needs.
Analisis Total Suspended Solid (TSS) Perairan Danau Toba di Kecamatan Girsang Sipangan Bolon, Sumatera Utara Angelina Juniarta Panjaitan; Devi Ulinuha; Ni Made Ernawati
Current Trends in Aquatic Science Vol 6 No 2 (2023)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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Abstract

Lake Toba, one of the largest lakes in Indonesia, is located in the province of North Sumatera, which has a significant tourism sector. Increased human activity can place the aquatic ecosystem of Lake Toba under great ecological pressure. Total Suspended Solids (TSS) are an important water quality indicator. Various human activities are carried out on Lake Toba, including fish farming in floating net cages (KJA), tourism, and water transportation. This activity produces organic and inorganic substances that have the potential to reduce water quality. Based on the research results, the concentration of total suspended solids (TSS) at five sampling locations exceeded class II water quality standards. The TSS concentration has different variations from the other 4 water sampling points because the 4 water sampling points are not passed by shipping lanes. The large TSS values at the 5 water sampling points can be caused by domestic waste generated from port activities, water transportation, tourism activities, hotels, and offices.
Aplikasi Probiotik Probio One dengan Dosis yang Berbeda pada Pakan Ikan Nila Ni Made Ayuk Suardani; Gde Raka Angga Kartika; Hardiansyah Bama Saputra
Current Trends in Aquatic Science Vol 6 No 2 (2023)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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Abstract

Various efforts have been made by the community to improve the quality and further accelerate the growth of nile fish. One of them is by mixing probiotics into fish feed. The probiotic used is probio one probiotic which is usually given to koi fish. This study was conducted to find out how the growth of tilapia given feed mixed with probiotics with different doses. The study was conducted with treatment A as a control, treatment B using a probiotic dose of 2,5 g/kg feed, treatment C using a probiotic dose of 5 g/kg feed, treatment D using a dose of 7,5 g/kg feed and treatment E of 10 g/kg feed. This research was conducted over a period of 40 days. Water quality parameters measured in this study included pH, temperature and DO as well as observations of fish growth in the form of absolute weight, specific growth rate (SGR), survival rate and feed conversion ratio. Growth observations were analyzed using One Way Analysis of Variance (ANOVA) and a follow-up test in the form of Duncan's Test. The results showed that the treatment using a dose of 7,5 g/kg feed gave a significantly different effect on absolute weight, specific growth rate and survival rate of tilapia. The water quality parameters measured included pH in the range of 7,98-8,20 while DO in the range of 6,8 – 8,4 mg/L and temperature in the range of 26,64 -26,90°C.
Intensitas dan Prevalensi Parasit Pada Insang Ikan Nila yang dibudidayakan di Balai Benih Ikan (BBI) Sentral Sangeh I Gusti Ayu Agung Purnama Sari; Pande Gde Sasmita Julyantoro; Dewa Ayu Angga Pebriani; Endang Wulandari Suryaningtyas
Current Trends in Aquatic Science Vol 6 No 2 (2023)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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Abstract

Parasites in the body of cultivated fish will cause harm to the fish, because the parasites take nutrients from their hosts, it is necessary to study the intensity and prevalence of parasites in tilapia (Oreochomis niloticus) in order to determine the density of parasite attacks and the percentage of parasites in tilapia. Samples of tilapia (Oreochomis niloticus) were taken from the Central Sangeh Fish Seed Center (BBI). The research was conducted for 3 months from October 4th 2022 to December 13 2022 randomly sampling. Samples of tilapia (Oreochomis niloticus) examined were 36 samples of Nila Nirwana fish. The parasites found in the external organs (ectoparasites) were only found in the tilapia gills, while for the internal organs (endoparasites) parasites were not found in both the stomach and intestines of the fish. The ectoparasites found were Dactylogyrus sp. (2181 ind) and Gyrodactylus sp. (157 ind). The highest intensity was in the genus Dactylogyrus of 60.6 ind/fish including the severe category, while for the genus Gyrodactylus of 4.4 ind/head including the low category. The highest prevalence value was in the genus Dactylogyrus with 92% in the always category while in the genus Gyrodactylus it was 78% in the usual category. This study’s supporting data for water quality includes temperature, pH, DO, and ammonia. Where temperature during the study ranged from 28-30oC, pH or acidity ranged from 7.6-8.5, and DO or dissolved oxygen ranged from 7.3-8.4 mg/L. The water quality result in this study were normal for fish farming.
Pendekatan Ekosistem pada Pengelolaan Perikanan Lemuru Skala Besar Melalui Penilaian Domain Teknik Penangkapan Ikan di Perairan Selat Bali Arip Arip; I Wayan Restu; Made Ayu Pratiwi
Current Trends in Aquatic Science Vol 6 No 2 (2023)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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Fishery activities Sardinella lemuru in the waters of the Bali Strait are the largest source of economy for fishermen in Pengambengan, Jembrana Regency, Bali. The purpose of this study was to determine the condition of the lemuru fishery in the Pengambengan Fishing Port by assessing the domain of fishing techniques in fisheries management using an ecosystem approach (EAFM). The results of the assessment of the indicators of destructive and/or illegal fishing methods get a score of 3, the indicator of modification and fishing aids gets a score of 1, the indicator of fishing capacity and fishing effort gets a score of 3, the selectivity of fishing gets a score of 3, the suitability of functions and the size of the vessel according to legal documents get a score of 1 and fishing boat crew certification following regulations gets a score of 1. Based on the results of the composite score, the value obtained is 73.33 which means that the lemuru fishery in Pengambengan Fishing Port based on the fishing technique domain is good with a colored flag model light green.
Identifikasi Sampah Laut (Marine Debris) di Pantai Petitenget, Bali Cindy Claudya Br Sembiring; Devi Ulinuha; Ni Luh Gede Rai Ayu Saraswati
Current Trends in Aquatic Science Vol 6 No 2 (2023)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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Abstract

Marine debris has caused various problems to the environment, including transporting contaminants and invasive species. Moreover, it also, has an impact on socio-economic of coastal community and on the sustainability of marine biota and its cosystem. The aim of this research is to identify the characteristics and quantity of waste generation (weight, composition, and density) in Petitenget Beach. The study was conducted from October to December 2022. The data collection method was carried out by purposive sampling based on Ministry of Environment and Forestry 2020 Beach Waste Monitoring Guidelines. The results showed that the majority types of macro-inorganic waste found on Petitenget Beach were plastics, which was categorized as foamed plastic, glass, rubber, cloth, metal, and other materials. For this type of inorganic waste, meso-inorganic waste consists of plastic and foamed plastic. Plastic has the highest mass, waste composition and density of inorganic waste found on Petitenget Beach, 0.2017 gr/m², 93,5% and 0.0733 items/m², respectively. Overall, this study shows that plastic waste has polluted both beaches with high mass, amount, type composition, and density. The oceanographic conditions during the study, namely the highest current speed occurred in November, namely 0.7 m/s, the wave height of the sea water at Petitenget Beach during the study period ranged from 1.1 m-2.5 m. The highest water movement at high tide reaches 2.17 m and at low tide reaches 0.25 m.
Keseragaman dan Kondisi Karang Family Acroporidae di Kukusan Besar, Labuan Bajo, Flores, Nusa Tenggara Timur Johannes Lumban Tobing; I Wayan Arthana; I Wayan Darya Kartika
Current Trends in Aquatic Science Vol 6 No 2 (2023)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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Kukusan Besar, Labuan Bajo, which is located in East Nusa Tenggara is one of the fertile waters that was a diversity of marine biota in the form of coral reefs. The purpose of this study was to determine the uniformity and condition of corals, especially the corals of the Acroporidae Family. This research was carried out from November 2021–April 2022. Determination of coral data collection points used a purposive sampling method. Retrieval of coral data using the underwater photo transect (UPT) method, with the transect spread along 50 meters in the direction of the coastline at every point of depth of 3, 5 and 7 meters. Underwater photos were analyzed using CPCe software. Coral cover at a depth of 3 meters is 29.12%. The depth of 5 meters is 36.54% and at a depth of 7 meters is 42.18%. At depths of 3 and 5 meters the corals of the Acroporidae family are dominated. The highest diversity index is found at a depth of 7 meters with a value of 2.20. The highest uniformity index was found at a depth of 5 meters with a value of 0.69. Family Acroporidae at a depth of 3 and 5 meters found 4 genera namely Acropora, Montipora, Astreopora and Anacropora, while at a depth of 7 meters there were only 2 genera namely Acropora and Montipora.
Pengaruh Penggunaan Poly Aluminium Chloride (PAC) terhadap Air Limbah Budidaya Ikan Nila Ima Yudha Perwira; Devi Ulinuha
Current Trends in Aquatic Science Vol 6 No 2 (2023)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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Abstract

Nile Tilapia culture is potential to provide waste containing high organic matter and turbidity. Therefore, it is important to perform waste water treatment on this culture to reduce the environmental polution risk caused by this activity. This study aimed to reduce the organic material amount and other substances in the waste water of Nile Tilapia culture by using Poly Aluminium Chloride (PAC). The study was performed experimentally by using 4 treatments: PAC 0 mg/L (control), PAC 10 mg/L, PAC 15 mg/L, and PAC 20 mg/L. Total organic matter (BOT) was measured using permanganate method, water turbidity was measures using Turbidimeter, total suspended solids (TSS) was measured using Gravoimetric method, ammonia was measured using Nessler method, nitrite was measured using NED dihydrochloride-Sulfanilamide method, nitrate was measured using cadmium-reduction method, and phosphate was measured using Ascorbic acid method. The study showed that PAC 15 and 20 mg/L drastically reduced the BOT and turbidity (>30%), while the reduction of TSS was not more than 25%. Ammonia, nitrite, nitrate, and phosphate were not influenced by the application of PAC.

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