Asian Journal of Aquatic Sciences

EFFECTIVENESS OF Daphnia sp ENRICHMENT WITH DIFFERENT LEVELS OF Spirulina platensis FLOUR ON COLOR BRIGHTNESS AND GROWTH OF KOI CARP (Cyprinus rubrofuscus)

Dela Puspita Buhang, Juliana Juliana, Mulis Mulis (Author) — Tue, 06 Aug 2024 13:50:38 +0000

Koi (Cyprinus rubrofuscus) is one of the freshwater fish farming commodities that has an attractive color. Cultivators are trying to improve the quality of the color of this fish by adding a source of pigment. One is Spirulina, a source of natural pigments added to feed. Spirulina platensis has a content of B-carotene (28%) and Zeaxanthin (17%). This study aims to enrich Daphnia sp by using S.platensis flour to increase koi fish's color brightness and growth. This research was carried out for ±40 days at the Tatelu Freshwater Aquaculture Fisheries Center (BPBAT) Tatelu. The research method is experimental by applying a Complete Random Design (CRD) consisting of 4 treatments and three replicates. Treatment A (Control), B (3 g/L), C (5 g/L), D (7 g/L) S.platensis flour. The test fish used were 96 koi carp seeds with a length of 57 mm and a body weight of 5.47 g. The containers used are 12 glass aquariums measuring 30×40×40 cm3 with a volume of 48 L and fish stocking density of 8 fish. The data analysis used was Analysis of Variance, and a further test of the Smallest Real Difference (BNT) was carried out using the SPSS version 26.0 application. The results showed that the application of Daphnia sp enriched with S.platensis flour could have a real effect on the color brightness and specific growth rate of koi carp (p<0.05). The best treatment in this study was the administration of S.platensis flour as much as 7 g/L.

ANALYSIS OF THE CONDITION AND AREA OF CORAL REEF COVER IN THE WATERS OF PANDAN ISLAND, WEST SUMATRA PROVINCE

Dina Harven Clara, Thamrin Thamrin, Bintal Amin (Author) — Tue, 06 Aug 2024 13:55:23 +0000

This research was carried out in January 2024 in the Pandan Island Conservation Area, Padang City, West Sumatra Province. The aim was to determine the condition and the extent of coral reef cover in this area. The method used in this research is a survey method with quantitative analysis using coral reef observation data. Data was collected at three stations using the UPT (Underwater Photo Transect) method, namely by diving using Scuba diving equipment and taking underwater photos using a digital camera. The percentage of coral reef cover at the three stations includes Station I (Pandan Island to the south), which has a coral cover of 67.60% categorized as good, and Station II (Pandan Island to the east), which has a cover of 69.07%, which is classified as good. Station III (Pandan Island to the north) has a cover of 63.04%, categorized as good. The types of growth of living coral reefs (life form) found at Station I are dominated by Coral Foliose (CF) at 44.13%, at Station II, it is dominated by Coral Foliose (CF) at 38.13%, and Coral Encrusting (CE) amounting to 14.73%. In comparison, Station III was dominated by Coral Encrusting (CE), amounting to 20.86%, and Coral Massive (CM), amounting to 15.90%. Based on the image classification results, it can be concluded that the area of living coral reefs in the research area is 14.65 ha

POPULATION STRUCTURE OF THE Meretrix meretrix IN THE INTERTIDAL ZONE OF SRI TANJUNG VILLAGE RUPAT SUB-DISTRICT BENGKALIS DISTRICT

Latifatul Khoiriyah, Afrizal Tanjung, Elizal Elizal (Author) — Tue, 06 Aug 2024 15:16:18 +0000

This study aims to determine the population structure of Meretrix meretrix in the intertidal zone in Sri Tanjung Village, including abundance, distribution patterns, and size distribution. This research was conducted in February 2024 in Sri Tanjung Village, Rupat District, Bengkalis Regency. The research method used was the survey method. M. meretrix is one of the biota that lives in tidal areas where the subzone that experiences tides is divided into 3 (three) subzones (upper, middle, and lower). The research site is divided into two research stations. Each station is divided into 3 (three) transects, each consisting of 3 (three) plots with a size of 1 x 1 m². Environmental parameters include temperature, salinity, pH, substrate type, and organic matter. The results showed that the highest abundance was found in the Lower subzone at station I, with an average abundance of 8.66 ind/m², and at station II, with an average abundance of 4.33 ind/m². In comparison, the lowest abundance is found in the upper subzone at station I with an average value of 3 ind/m^2, and the lowest abundance at station II with an average of 1 ind/m². The size distribution of M. meretrix at station 1 obtained seven classes, with the highest number of individuals in the 3rd class (2.33 - 2.92 cm), while at station 2, there were six classes where the highest number of individuals was in the 3rd class (1.47 - 1.81 cm). The distribution pattern of M. meretrix found is random and uniform. The analysis results of M. meretrix abundance between stations and M. meretrix abundance between intertidal subzones differed significantly

MINERAL CONTENT PROFILE OF CARAPACE FLOUR, CHITIN, AND CHITOSAN SLIPPER LOBSTER (Thenus orientalis)

Wed, 07 Aug 2024 16:14:59 +0000

Slipper lobster live on the bottom of sandy and muddy waters at a depth of 10-200 m and are found throughout Indonesian waters. The carapace is the most significant part of its body, of which approximately 50% is a source of waste, but it can be utilized as functional food in the form of chitin and chitosan. One of the determinations of chitin and chitosan quality depends on the demineralization process. The potential of this shrimp has not been fully utilized due to the lack of information on mineral content after the demineralization process. This study aims to obtain information on flour, chitin, and chitosan mineral content. This research used a descriptive method. The parameters observed were yield, water, ash, and mineral content (K, Mg, Ca, Na, Fe, and P). The results showed that slipper lobster weighed about 80-240 g with a length of 15-25 cm with the yield and mineral content of flour, chitin and chitosan of slipper lobster carapace as follows: yield 29.04%, 41.02%, 33.42%, water 2.36%, 3.96%, 3.25%, ash 52.89%, 8.27%, 3.16%, potassium 55.73 mg/L, 9.09 mg/L, 4.55 mg/L, magnesium 37.23 mg/L, 5.59 mg/L, 5.95 mg/L, calcium 766.87 mg/L, 137.62 mg/L, 126.91 mg/L, sodium 146.62 mg/L, 17.82 mg/L, 10.73 mg/L, iron 12.82 mg/L, 1.89 mg/L, 1.72 mg/L, phosphorus 0.17 mg/L, 0.06 mg/L, 0.05 mg/L

CONDITION OF THE MANGROVE FOREST AT UNIVERSITAS RIAU MARINE STATION, DUMAI

Rifaa Ghina Aulia Siregar, Efriyeldi Efriyeldi, Aras Mulyadi (Author) — Mon, 12 Aug 2024 17:29:33 +0000

Mangrove plant communities grow well in tropical regions and adapt to extreme environmental conditions. The coastal area of Dumai is filled with various activities in the form of industry, ports, agriculture, and settlements. The complexity of activities on the beach greatly affects the balance of the ecosystem. This study aimed to determine the composition of mangrove forest species and conditions based on density value, importance index, percentage of canopy cover, and mangrove stand height. The survey method used in this study, where the data collected is primary data. There are four species of mangroves, including Rhizophora apiculata, Bruguiera gymnorriza, Xylocarpus granatum, and Sonneratia alba. The density of mangroves is in good condition, with dense densities ranging from 2067-3266.67 ind/ha. Canopy closure in good condition ranges from 76.12-80.45%. The highest important value index is R. apiculata, with a value of 159.64%, and the lowest is B. gymnorriza, 13.77%. The highest stand was S. alba, with a value of 18.84 m, and the lowest was X. granatum, with a value of 10.60 m

IDENTIFICATION OF TYPES AND ABUNDANCE OF MICROPLASTICS IN BEACH SEDIMENTS IN PADANG CITY, WEST SUMATRA

Sabrina Nur Fitri, Bintal Amin, Dessy Yoswaty (Author) — Tue, 13 Aug 2024 15:52:19 +0000

The presence of plastic waste in the ocean significantly impacts pollution. Lightweight plastic is transported by currents and waves, eventually accumulating in sediment. Its slow decomposition is influenced by composition and environmental conditions. Using a survey method at three stations in Padang City’s coastal waters, this study aims to investigate the composition and quantity of microplastics in sediment. Variations in microplastic levels across stations were analyzed using One-Way ANOVA, and differences between dry and wet zones and depths of 0-10 cm and 10-20 cm were examined with Independent Samples T-tests. Three microplastic categories were identified: fibers, fragments, and films, with an average concentration of 100.55 particles/kg. The Ulak Karang Beach estuary exhibited the highest particle concentration (129.16 particles/kg), whereas Banana Beach, characterized by minimal human activity, displayed the lowest concentration. There were significant differences (p<0.05) in the abundance of microplastics between stations. It was observed that the dry zone exhibited a higher concentration of particles (125.00 particles/kg) in contrast to the wet zone (76.66 particles/kg). In the 0-10 cm depth range, there was a higher abundance of microplastics (111.66 particles/kg) compared to the 10-20 cm depth range (89.44 particles/kg). The abundance of microplastics was significantly different (p<0.05) between the two coastal zones but not significantly different (p>0.05) between depths. Several possible causes of these differences were examined, but further research is needed to investigate other oceanographic factors and gain a more comprehensive understanding

VERTICAL DIVERSITY OF EPIPHYTIC DIATOMS ON STEMS OF Rhizophora sp AND FRONDS OF Nypa sp IN KUNDUR WATERS KARIMUN REGENCY, RIAU ISLANDS PROVINCE

Yulia Sapta Rini, Efriyeldi Efriyeldi, Sofyan Husein Siregar (Author) — Wed, 14 Aug 2024 14:12:15 +0000

This study was conducted in the waters of Kundur Island, Karimun Regency, Riau Islands Province, to assess the type, abundance, and diversity of epiphytic diatoms on Rhizophora sp stems and Nypa sp fronds using a survey method and purposive sampling for station selection. One-way ANOVA, LSD tests, and the Independent Samples T-test were employed for data analysis. The research identified 11 species of epiphytic diatoms: 9 from the Bacillariophyceae class (including Navicula sp, Pleurosigma sp, Pinnularia sp, and Skeletonema costatum); Isthmia sp from the Coscinodiscophycidae class, and Chaetoceros sp from the Bacillariophyceae class. The results indicated a higher abundance of diatoms on Nypa sp fronds (17,822.94 ind/cm²) than on Rhizophora sp stems (13,884.16 ind/cm²). Significant differences in diatom abundance were observed between stations on Rhizophora sp. stems, particularly between stations II and III. In contrast, no significant differences were found between stations I and II or stations I and III. No significant differences in diatom abundance were observed between stations on Nypa sp fronds. The T-test results revealed significant vertical differences in diatom abundance between Rhizophora sp stems and Nypa sp fronds. Overall, the diversity of epiphytic diatoms was categorized as medium on both Rhizophora sp stems and Nypa sp fronds in the waters of Kundur Island, Karimun Regency, Riau Islands Province. This study contributes valuable insights into the ecological dynamics of epiphytic diatoms in mangrove and nipa palm habitats

THE RELATIONSHIP BETWEEN NITRATE AND PHOSPHATE CONTENT AND DIATOM ABUNDANCE IN THE WATERS OF PANDAN ISLAND, WEST SUMATRA

Candri Moulidia, Syahril Nedi, Elizal Elizal (Author) — Wed, 14 Aug 2024 15:51:40 +0000

This research was conducted in the waters of Pandan Island, West Sumatra, to determine the content of nitrates, phosphates, and diatom abundance and the relationship between nitrate and phosphate concentrations and diatom abundance. The method used is the survey method. The sampling station is determined by purposive sampling based on cardinality. Define the relationship between nitrate and phosphate content content and diatom abundance using simple linear regression. The results showed that there were eight species of diatoms with the class Bacillariophyceae, including Isthmia sp, Amphora sp, Closterium sp, Nitzschia sp, Hemiaulus sp, Asterionella formosa, Leptocylindrus sp. The highest diatom abundance was at station IV, with an average abundance value of 14.092,09 ind/L, and the lowest abundance was at station I, with an average of 5.317,77 ind/L. The relationship between nitrate concentration and diatom productivity was obtained with the value of y = 31.184x-15.082 and the correlation coefficient (r) = 0.711. Meanwhile, the phosphate concentration on diatom productivity was obtained with a value of y = 51.543x-32.477 and a relational (r) coefficient value = 0.738. There is a strong relationship between nitrate and phosphate content and diatom abundance in the waters of Pandan Island, West Sumatra

POTENTIAL FOR MARINE ECOTOURISM DEVELOPMENT AT SUNUA BEACH PARIAMAN CITY WEST SUMATERA PROVINCE

Miftahul Ikhsan, Joko Samiaji, Syafruddin Nasution (Author) — Thu, 15 Aug 2024 13:41:45 +0000

Marine ecotourism activities can increase income for nature conservation, which can be used as a tourist attraction that produces economic benefits for the lives of people in the area and the surrounding area. The tourism potential of Sunua Beach is not yet known from scientific studies. The lack of information regarding this research location means that many foreign tourists need to learn about this tourist location. The research was conducted in February-March 2024 at Sunua Beach, Pariaman City, West Sumatra Province. The study aims to identify the potential and objects that need to be developed at Sunua Beach as a marine ecotourism area, to determine public perceptions, and to formulate a strategy for developing marine ecotourism to support sustainable tourism. The method used in research is a survey method. The placement of station points was carried out using the purposive sampling method. The water quality measurements were observed by temperature, brightness, salinity, pH, current speed, water depth, and beach slope. The selection of respondents each consisted of 15 tourists, 15 local communities, 10 business actors, and 10 policymakers. Based on the Tourism Suitability Index, Sunua Beach is included in the S1 category (very suitable) with tourist suitability index values of 83.97%, 86.53%, and 83.97%, respectively, on SWOT analysis through observation and identification of various factors in the field, the results obtained a member of Strengths, Weaknesses, Opportunities and Threats at Sunua Beach. The results of the analysis will be used to develop strategies for developing ecotourism at Sunua Beach

POPULATION STRUCTURE OF Cerithidea obtusa (GASTROPODA) IN THE INTERTIDAL ZONE OF THE EASTERN COAST BENGKALIS ISLAND RIAU PROVINCE

Nely Fitriani, Syafruddin Nasution, Aras Mulyadi (Author) — Thu, 15 Aug 2024 14:42:41 +0000

This research investigates the population dynamics of the gastropod Cerithidea obtusa along the eastern intertidal zones of Bengkalis Island, focusing on species abundance, spatial distribution, and size variation. Conducted over the span from December 2023 to January 2024, this investigation took place at two specific locales on the east coast of Bengkalis Island: Sekodi Village (Station I) and Teluk Lancar Village (Station II), employing a comprehensive survey methodology. The intertidal zones were segmented into upper, middle, and lower subzones, each with three transects containing one m² plot. Temperature, salinity, pH levels, substrate composition, and organic matter content were measured as indicators of the quality of the environment. The results revealed a significant difference in population density between the stations, with Station I showing the highest abundance at 240.000 ind/Ha and Station II the lowest at 33.300 ind/Ha. The middle subzone at Station I was the most populated, with 93.300 ind/ha. Shell size analysis revealed three categories: small (<3,35 mm), medium (3,35-4,05 mm), and large (≥4,05 mm), with medium-sized shells being the most prevalent. The distribution pattern of C. obtusa exhibited both uniform and clustered arrangements. A significant disparity in abundance was noted between Station I and Station II, with a p-value of 0,000, underscoring the considerable variation in population density between the two locations

POTENTIAL OF CORAL REEF ECOSYSTEMS FOR DEVELOPING MARINE TOURISM ON PASIR PUTIH BEACH, SUKABUMI DISTRICT

Fri, 16 Aug 2024 04:31:44 +0000

The coral reef ecosystem is one of the main ecosystems in coastal areas. Physically, it has a role as a protector of the coast from currents and waves, and ecologically, it has a role as a habitat for various marine biota for shelter and foraging. Besides that, with their elegance and beauty, coral reefs can become an attraction for marine tourism. This research aims to describe the condition of the coral reef ecosystem and analyze the suitability of coral reef conditions to determine the potential for marine tourism on Pasir Putih Beach, Sukabumi Regency. The method used is direct observation and measurement of parameters needed to determine the potential for marine tourism. Data processing and analysis were performed using CPCe 4.1 software and Microsoft Excel. The observations and data analysis results show that the potential for marine tourism in Pasir Putih Geopark Ciletuh can be considered reasonable according to the tourism suitability index criteria

HISTOPATHOLOGICAL OVERVIEW ASIAN REDTAIL CATFISH (Hemibagrus nemurus) SKIN AND GILLS INFECTED WITH ECTOPARASITES

Nada Hanifah, Sri Hidayati, Muhammad Tri Aji (Author) — Fri, 16 Aug 2024 06:10:58 +0000

Frequent problems faced in fish farming are possible parasites that cause a declining level of fish production. The study's objective is to know the damage to the skin and gills of Asian redtail catfish in a manner that infects histopathology ectoparasites. The sample used three fish in each pool: Freshwater Fish Hatchery and Cultivation (PBIAT) Ngrajek and Regional Technical Implementation Unit (UPTD) Freshwater Fish Hatchery Sawangan in July 2022. Results data analysis inspection histopathology skin found necrosis and infiltration cell inflammation, for gill found exists infection parasite Dactylogyrus sp and Ichthyophthirius multifiliis as well as secondary lamellae adhesions, congestion, and cartilage hyperplasia hyaline

INVENTORY OF FISH SPECIES IN OXBOW TELUK BENDERAS, RANTAU BARU VILLAGE, PANGKALAN KERINCI DISTRICT PELALAWAN REGENCY RIAU PROVINCE

Khoirunisyah Khoirunisyah, Ridwan Manda Putra, Efawani Efawani (Author) — Fri, 16 Aug 2024 07:03:35 +0000

Teluk Benderas Lake is an oxbow lake formed because the Kampar River's flow was cut off. This lake is a habitat for various types of fish. However, information on fish species in the area is still limited. To find out the kinds of fish in Teluk Benderas Lake, a study was conducted in March-May 2023 using the survey method. Fish sampling was performed once a week for two months. The fish were caught using a trawl measuring 150 m long and 4,5 m wide with 1-inch mesh size. Water quality parameters measured were temperature, brightness, depth, pH, DO, and CO_2.The results showed that 1.398 fish were caught, consisting of 4 orders, 13 families, 25 genera, and 32 species. Based on the results of water quality measurements, it was concluded that Teluk Benderas Lake can still support fish life in the waters

POPULATION STRUCTURE Nerita articulata (GASTROPODA) IN THE INTERTIDAL ZONE OF TELUK LANCAR VILLAGE BENGKALIS DISTRICT RIAU PROVINCE

Hana Ramadila, Syafruddin Nasution, Zulkifli Zulkifli (Author) — Sat, 17 Aug 2024 14:50:46 +0000

The population structure is a collection of organisms living in a particular area at a specific time and originating from the same species. The intertidal zone is between the sea's high and low tide lines, which have extreme ecological conditions. Several groups of organisms, including gastropods, can adapt to this environment. One type of gastropod that inhabits this area is Nerita articulata. This research was conducted in December 2023 in the intertidal zone of Teluk Lancar Village. The study aimed to analyze the population structure of N. articulata in the intertidal zone of Teluk Lancar Village, including population abundance, shell size frequency distribution, and distribution patterns. The research used a survey method. The intertidal zone is divided into three subzones: upper, middle, and lower. In each subzone, three quadrat plots measuring 1x1 m are placed. Environmental parameters measured include water quality, such as temperature, salinity, pH, substrate type, and organic matter. The research results indicate that the population abundance of this species varies, ranging from high to moderate to low. The highest abundance is found in the upper subzone, while the lowest is in the lower subzone. The shell sizes of this species are grouped into 3 size classes: <18.3 mm, 18.3-24.4 mm, and >24.4 mm. The largest and smallest shell sizes are commonly found in the upper subzone. The distribution pattern is uniform with a Morisita index value (Id < 1). The abundance of N. articulata among subzones differs significantly (p < 0,05), while the size among subzones does not differ significantly (p > 0,05)

EFFECT OF THE COMBINATION OF SALINITY AND WALNE FERTILIZER ON THE POPULATION GROWTH OF Nannochloropsis sp ON LABORATORY SCALE

Atthoriq Habib Harry Aslam, Syafruddin Nasution, Irvina Nurrachmi (Author) — Sat, 17 Aug 2024 16:08:26 +0000

Activities of phytoplankton culture needed to be supported by physical and chemical parameters. This study aimed to analyze the effect of a combination of salinity and Walne fertilizer on the population growth of Nannochloropsis sp on the laboratory scale. The method used in this study is an experimental method using CRD (Completely Randomized Design) experimental design with 2 factors, namely salinity and Walne fertilizer, and each factor is given 3 levels of treatment. The level value of each factor is combined to obtain 9 combinations with 3 replications to obtain a total of 27 experimental units. The results of measuring the water quality parameters show that the media conditions were in good condition: an average temperature of 21℃, an average pH of 7.6, and the LED light used is ±2,000 lux. The results showed no significant effect of the combination of salinity and Walne fertilizer on the population growth of Nannochloropsis sp. The best combination value was obtained in the S1W1 treatment with a combination of 15 ppt salinity and 0.5 mL Walne fertilizer dose, resulting in cell population density (4125x10³cells/mL). The second best was obtained in the S1W2 combination with 15 ppt salinity and 1 mL Walne fertilizer dose (3775x10³cells/mL).

THE EFFECT OF POWDERED NONI FRUIT (Morinda citrifolia) AS A FEED SUPPLEMENT ON THE GROWTH AND SURVIVAL RATE OF SILVER BARB (Barbonymus gonionotus)

Mutiara Putri, Sri Hidayati, Eric Armando (Author) — Sun, 18 Aug 2024 07:16:25 +0000

Silver barb is one of the fish that can be cultivated year-round due to their excellent ability to adapt to Indonesian climate. One of the problems that cultivators often face is feeding; long-term commercial feeding or pelleting will negatively impact the fish’s body. Therefore, a natural admixture of feed can become an alternative solution. This study used powdered noni fruit as a feed supplement for silver barb (Barbonymus gonionotus) because of its content of antioxidant compounds that can reduce oxidative stress due to free radicals. This study aims to determine the best practice of feeding powdered noni fruit as a feed supplement and its influences on silver barb's growth and survival rate during the fingerling phase. The study was conducted in November – December 2022 using a complete randomized design experiment consisting of four treatments and four retries. Random sampling took five fish sized 2 – 3 cm as samples. The cultivation container used in this study has a volume of 30 L, with each container containing ten samples. This study uses one-way ANOVA and is continued with a DMRT test to find the best doses of powdered noni fruit. The result shows that the best addition of noni powder was 15% of the total feed. This addition of noni powder demonstrates an increase of growth yield by 1.62 cm, absolute weight of 2.11 g, 87.5% survival rate, and feed conversion ratio of 0.0535. Moreover, the percentage of fish weight increases by 1.1% for every 1% increase in height.

POTENTIAL OF VARIOUS INDONESIAN MEDICINAL PLANTS TO INHIBIT THE GROWTH OF Aeromonas hydrophila BACTERIA

Sun, 18 Aug 2024 14:41:44 +0000

Aeromonas hydrophila is a gram-negative bacterium that can infect fish and is zoonotic to humans. Efforts to prevent this bacterial infection can be made using herbal plants due to the content of secondary metabolite compounds. This study aims to explore plants that have the potential as antibacterials, especially A. hydrophila bacteria. This research was conducted in February 2024 at the Marine Biotechnology Laboratory, Faculty of Fisheries and Marine Sciences, Universitas Riau. The experimental method used included the stages of preparation of plant leaf samples and antibacterial tests using Kirby-Bauer discs. The plants used were the leaves of senduduk (Melastoma malabathricum), kantong semar (Nepenthes sp), lime (Citrus aurantifolia), belimbing bukit (Acetosella barreligeri), sirsak (Annona muricata), mucuna (Mucuna bracteata), Israel grass (Asystasia gangetica), and miana (Coleus scutellariodes). The results showed that the leaves of kantong semar, senduduk, and belimbing bukit could inhibit bacterial growth in a strong category. In contrast, the leaves of sirsak, mucuna, Israel grass, miana, and lime were classified as moderately inhibiting the growth of A. hydrophila bacteria. In conclusion, these herbal plants can potentially prevent A. hydrophila bacterial infection

EVALUATION OF WATER QUALITY AND GROWTH PERFORMANCE OF RED TILAPIA (Oreochromis sp) IN CULTURE USING BIOFLOCK TECHNOLOGY

Sun, 08 Sep 2024 02:15:17 +0000

Water quality plays an important role in maintaining and increasing fish production. Tilapia (Oreochromis niloticus) is one of Indonesia's freshwater fish that has economic value. To increase production, tilapia cultivation is carried out intensively, characterized by high stocking density and provision of protein-rich feed. Good water quality control and feeding are key to the success of this intensive culture. Biofloc technology is one of the appropriate technologies for intensive tilapia rearing since fish can live at high densities and have a wide environmental tolerance. biofloc technology is an alternative solution to problems in overcoming cultivation waste such as ammonia and nitrite. Based on the above, this study was conducted to determine the effectiveness of the biofloc system in converting ammonia compounds, improving water quality in the aquaculture environment, and understanding the relationship between water quality and tilapia growth. The research was conducted for 60 days to measure several water quality parameters, namely temperature, dissolved oxygen, acidity (pH), and ammonia, and to observe the growth parameters of tilapia. The treatment applied in this study was the addition of probiotics in feed with four treatments and three replications. The results showed that the biofloc system's water quality is tolerant to tilapia growth. The best growth results in treatment A with each value of absolute weight 14.70±0.10^d, absolute length 6.70 ± 0.10^d, specific growth rate 3.87±0.01^c, and survival rate 100±0.00^b

ANALYSIS OF TYPES AND ABUNDANCE OF SOLID DOMESTIC WASTE IN THE COASTAL TOURIST AREA OF DUMAI CITY

Masdhuki Pramukti, Syahril Nedi, Bintal Amin (Author) — Fri, 27 Sep 2024 07:36:09 +0000

The coastal areas of Dumai City in Riau Province are rapidly developing regions, especially in the tourism sector. This city offers several attractive beach destinations, such as Pasir Koneng Beach, Beringin Indah Beach, and Purnama Beach, attracting many local and international tourists. However, tourism growth in Dumai City also leads to an increase in solid domestic waste, which can threaten the coastal environment and the sustainability of marine ecosystems. This research aims to analyze the types and abundance of solid domestic waste in the coastal tourism areas of Dumai City. Through direct survey methods and descriptive analysis, samples of solid domestic waste were collected from three different beach locations: Purnama Beach, Koneng Beach, and Beringin Indah Beach. The results show that plastic waste is the most dominant type in all research locations, followed by wood and Styrofoam. Analysis of solid domestic waste's mass density and abundance indicates no significant difference between sampling stations or sampling times. This study provides a better understanding of the solid domestic waste issue in the coastal areas of Dumai City. It emphasizes the need for more effective management actions to maintain the sustainability of coastal tourism environments and prevent negative impacts on marine ecosystems and human well-being

CORAL REEF DISTRIBUTION MAPPING CASE STUDY OF SETAN ISLAND WATERS, WEST SUMATRA

Bagas Ariya Pambudi, Thamrin Thamrin, Elizal Elizal (Author) — Fri, 27 Sep 2024 17:44:35 +0000

The research was conducted in May 2023 in Setan Island, West Sumatra. The study aimed to map the distribution of coral reefs, test the accuracy of the resulting map, and determine the condition of coral reef cover on Setan Island. The methods used are remote sensing methods using Sentinel-2 satellite imagery and field survey methods to validate the distribution of coral reefs resulting from image data processing (Groundcheck) and to observe the condition of coral reefs using the Underwater Photo Transect (UPT) method. Determination of sampling locations to ground check the distribution of coral reefs using a Stratified random sampling method while determining sampling locations for observations of coral reef cover using a purposive sampling method. The study results obtained a coral reef distribution map with a reef distribution area of 13.18 ha or 47.55% of the total shallow water area. The accuracy test found an accuracy value of 80% with a kappa coefficient 0.7, where the category is good and the level of trust is moderate. The condition of coral reef cover based on live corals in the waters of Setan Island is in the Fair and Poor categories. Percentages range from 0.33% to 31.36%. The dominating lifeform types are coral massive and coral submassive