DEPIK Jurnal Ilmu-Ilmu Perairan, Pesisir dan Perikanan
Not a member yet
571 research outputs found
Sort by
Assessment of shark catches landed at PPI Ujung Serangga, Southwest Aceh
Full text linkThis study aimed to assess shark catches at PPI Ujung Serangga, Southwest Aceh, focusing on species composition, size and conservation status. Data were collected through field surveys and direct measurements of sharks landed by fishers. Results showed that bottom longlines were the most widely used fishing gear and produced the highest shark catches. A total of 643 individual sharks from 16 species were identified, with the family Carcharhinidae dominating the catch. Most of the sharks caught were below gonad length (Lm), indicating the potential for juvenile shark fishing. The conservation status of sharks evaluated based on IUCN showed that most species were categorized as Near Threatened (NT) and Vulnerable (VU), with some species categorized as Critically Endangered (CR) and Endangered (EN). Almost all identified shark species are listed in CITES Appendix II. This research highlights the importance of sustainable shark fisheries management to maintain populations and biodiversity in the Southwest Aceh region.Keywords:SharkConservation StatusCITESSouthwest Ace
Composition and distribution of Lutjanus johnii and other species using wire traps in the waters of Rigaih, Aceh Jaya Regency
Full text linkThe catch results show that wire traps are an effective and selective fishing gear for Lutjanus johnii, with a total catch of 244.1 kg. The bycatch, consisting of 10 species, amounted to 208.1 kg, also caught using wire traps in the waters of Rigaih. This study aimed to identify the composition of the bycatch, the ratio between the target catches and the bycatch, and the size range of the dominant bycatch species caught during L. johnii fishing operations in Rigaih waters. The research was conducted in the waters of Rigaih during NovemberDecember 2024 using wire traps (dimensions: length x width x height = 120 x 100 x 75 cm). The results showed that the primary catch using wire traps was dominated by L. johnii, with a total of 135 individuals (48.7%) weighing 244.1 kg. The bycatch amounted to 208.1 kg (46.1%). The bycatch species included Caranx sexfasciatus with 42 individuals (15.2%) weighing 18.4 kg (4.1%), Lutjanus gibbus with 24 individuals (8.7%) weighing 31.9 kg (8.7%), and Epinephelus malabaricus with 24 individuals (8.7%) weighing 114.5 kg (25.3%). The dominant bycatch size classes caught in the wire traps included L. campechanus with a total length range of 1820 cm, L. campechanus with a total length range of 3045 cm, and Epinephelus malabaricus with a total length range of 4075 cm. The proportion of the target catch to bycatch by weight was 53.9% to 46.1%. This means that for every 1 kg of L. johnii caught, approximately 0.85 kg of bycatch was also captured.KeywordsLutjanus johniiwire trapAceh Jayasex ratiofish compositio
Population structure and morphometry of Carsinoscorpius rotundicauda in Mempawah Mangrove Park, West Kalimantan
Full text linkThe development of infrastructure could be one of a threat to habitat of horseshoe crabs. Regarding that, constructing of an international port at Kijing Beach in Mempawah could also become a menace to crabss habitat. Carcinoscorpius rotundicauda is known to be the most commonly found in Mempawah Mangrove Park (MMP) coastal area. This study aim is to analyze population structure and morphometry of Carsinoscorpius rotundicauda in MMP coastal area. Research was conducted on April-September 2022. Fishers collected horseshoe crab samples using trammel net. This study observed 14 characters and four ratios of morphometric, i.e. total length (TL), prosoma length (PL), opisthosoma length (OL), telson length, prosoma width (PW), carapace length (CL), compound eyes distance (CED), anal angle length (AAL), posterior angle distance (PAD), telson width (TW), median ridge length (MRL), anterior occeli length (AOL), process marginal length (PML), body weight, PL/OL, PW/PL, CL/TL, and CL/PW. The number of individuals of horseshoe crabs found high on September. The sex ratio of males to females was 1,95:1. The highest frequency relative of prosoma width was found in the range around 1214 cm (adult size). The ratio of PW/PL of female crab was significantly bigger than male. This difference could be used for determining sex of this species crabs. The growth pattern of mangrove horseshoe crabs bot males and females were negative allometry
Risk assessment of invasive species freshwater crayfish (Cherax quadricarinatus) in Lake Laut Tawar, Aceh
Full text linkThis study aims to assess the distribution of Cherax quadricarinatus based on depth and evaluate its invasiveness using a risk assessment in Lake Laut Tawar, Central Aceh. The study was conducted at five stations representing various lake activities: Station 1 (One-One), Station 2 (Bewang), Station 3 (Gegarang), Station 4 (Mendale), and Station 5 (Dedalu). The methodology involved direct observation in the field followed by laboratory analysis. The results showed that 284 individuals were caught, consisting of 138 females and 146 males, with carapace lengths ranging from 20 to 76 mm. No consistent distribution of male and female carapace lengths was observed across all stations. The abundance of Cherax quadricarinatus in Lake Laut Tawar was classified as very abundant (20%) at One-One and Bewang stations, both at a depth of 5 meters. In conclusion, Cherax quadricarinatus significantly dominates the lake ecosystem, as indicated by its relative abundance at different depths across the study sites. This species also shows a high potential for invasion in freshwater lakes, highlighting the need for effective management strategies.Keywords:Cherax quadricarinatusInvasive spesiesLake Laut Tawar, Ace
Size distribution of Haliotis asinina and abundance of periphyton in tapulaga waters
Full text linkThe Tapulaga waters, located in Soropia, Southeast Sulawesi, are among the coastal waters with significant potential for the seven-eyed abalone (Haliotis asinina). This species is a herbivorous gastropod that primarily consumes natural food sources such as periphyton and macroalgae. This study aims to determine the size distribution of H. asinina and analyze the presence of periphyton on seagrass leaves and macroalgal thalli. Sampling was conducted over six months in the Tapulaga waters of Soropia, Konawe Regency, Southeast Sulawesi, using a simple random sampling technique. The collected data were analyzed using descriptive statistical methods. The results indicate that the highest percentage of size distribution was observed in the range of 37.544.5 mm, comprising 34% of the total population. The population was categorized into two size groups: juveniles ( 49 mm) and adults ( 50 mm). Juveniles accounted for 75% of the total H. asinina population, while adults comprised 25%. A total of 11 periphyton species from three taxonomic classes Bacillariophyceae, Cyanophyceae, and Trebouxiophyceaewere identified on the seagrass species Enhalus acoroides and the macroalgae Gracilaria salicornia, Padina sp., Halimeda sp., Galaxaura sp., and Gelidium sp. The identified periphyton species included Aulacoseira sp., Nitzschia sp., Synedra sp., Diatoma sp., Fragilaria sp., Navicula sp., Pinnularia sp., Melosira sp., Lyngbya sp., Planctonema sp., and Cocconeis sp. Six of these periphyton species were present on both seagrass and macroalgal thalli. Synedra sp. was the most dominant species, exhibiting the highest abundance at 88,876 individuals/cm. The presence of periphyton as a natural food source attached to seagrass leaves and macroalgal thalli plays a crucial role in supporting the juvenile H. asinina population.Keywords:H. asininaMacroalgaePeriphytonTapulag
Optimizing juvenile sea bass (Lates calcarifer) survival during simulated transport using propack tablets and varying densities
Full text linkSea bass (Lates calcarifer) is a commercially important species with high economic value in both domestic and international markets. However, a major challenge in its aquaculture lies in the high mortality rate of fry during transport, primarily due to water quality deterioration and stress-induced responses. To mitigate these effects, the use of water-conditioning agents such as Propack tabletscomprising calcium oxide, zeolite, and clayhas been proposed. This study aimed to evaluate the effect of varying stocking densities on the survival and behavioral response of sea bass fry during 30-hour closed-system transport with Propack tablet supplementation. The experiment was conducted on May 17, 2024, at the Faculty of Marine and Fisheries, Syiah Kuala University, employing a completely randomized design (CRD) with five treatments and four replicates: P0 (50 fish, no Propack), P1 (50 fish + 50 ppm Propack), P2 (65 fish + 50 ppm), P3 (80 fish + 50 ppm), and P4 (95 fish + 50 ppm). The fry used were 56 cm in length. ANOVA results indicated that Propack tablets significantly influenced (P 0.05) the survival rate across densities. The highest survival rate (78.5%) and best behavioral response were observed in P1, indicating the efficacy of Propack tablets at lower densities in maintaining physiological stability during transport.Keywords:Sea bassPropack tabletsDensitySurvival rat
Utilization of domestic wastewater for the growth of microalgae Chlorella sp.
Full text linkThis study investigates the potential of using domestic wastewater as a growth medium for Chlorella sp. and examines how it affects water quality over a period of 24 days. The experiment was conducted using a Completely Randomized Design (CRD) with a single factor: four levels of domestic wastewater concentration0%, 25%, 50%, and 75%each tested in three replicates.The results showed that the highest biomass production occurred on day 8, reaching 0.337 mg/L in the 75% wastewater treatment (TR3), while the lowest was observed in the control group (C) at 0.210 mg/L. Statistical analysis using ANOVA followed by the Tukey test confirmed that the differences between treatments were significant (p 0.05). Correlation analysis showed a strong positive correlation between biomass and dissolved oxygen (DO, 0.949) and temperature (0.626), indicating that optimal light intensity and nutrient availability promote photosynthesis and biomass growth. In contrast, phosphate was negatively correlated with temperature (-0.738), suggesting that higher temperatures accelerate phosphate uptake by Chlorella sp. The study concludes that cultivating Chlorella sp. using domestic wastewater presents a sustainable solution for both biomass production and wastewater treatment. The microalgae help remove excess nutrients like nitrogen and phosphorus, enhancing water quality. However, as the algae decompose, they can also contribute to higher biological oxygen demand (BOD). This dual role underscores the promising potential of microalgae in promoting ecological wastewater management while supporting sustainable biomass production.Keywords:BiomassChlorella sp.Photobioreactorwastewate
Water pollution status of Deli River Medan, North Sumatra, based on Pollution Index (IP) and CCME WQI
Full text linkDeli River has been designated as a national river that has made a major contribution to the economic growth and development in the Medan city of North Sumatra. However, rapid urbanization and human population growth have caused degradation of the quality of Deli River due to increasing pollution. This study aims to analyze the level of pollution of the Deli River using the Pollution Index (PI) and CCME Water Quality Index (WQI) methods with reference to Government Regulation Number 22 of 2021. The research location was divided into 4 stations from upstream to downstream of the Deli River. Based on PI method, stations 1, 2, and 3 were classified as lightly polluted, while station 4 experienced moderate pollution. The results were different when using the CCME WQI method, which showed that stations 1, 2, and 3 were classified as having fairly good waters, while station 4 was poor waters. Water quality analysis was carried out on 13 parameters, 5 of which exceeded the river water quality standard threshold, namely BOD, ammonia, Pb, Zn, and Cd.Keywords:Deli riverRiver pollutionWater qualityPollution Index (IP)CCME WQ
Biodegradation activities of microplastic polymers by Agelas conifera sponge-symbiotic bacteria
Full text linkResearch on microplastic (MP) accumulation in marine organisms' tissue have been widely conducted, as well as research on microplastic biodegradation by microbial organisms from the environment.Agelas coniferasponge is proven to accumulate MP in its tissue as well as having bacteria as symbiotic organism. This research aims to screen and study biodegradation activities ofA. coniferasymbiotic bacteria on MP polymers, alsoto identify the species of those bacteria isolates. Bacterial Isolation ofA. coniferasponge tissue was using Zobell 2216E agar media. Screening and biodegradation assay of the bacteria isolates was conducted on Marine Salt Media agar that was added with 0,5 g of MP polymers, using Kroc-Boral method. Diameter of clear (bacterial growth) zone surrounding Kroc-Boral indicated the biodegradation activity of the bacterial isolates. Statistical analysis on the activity was using Two Way ANOVA. Results showed that there were 9 bacterial isolates of 53 that could degrade several MP polymers, with different activities (ANOVA, p value 0.05). High and low-density polymers (Linear- Low Density PolyEthylene/ LLDPE, Polyethylene/PE, and Polyvinyl Chloride/ PVC) were found to be degraded by all 9 isolates. Meanwhile, Polyethylen Taraphtalene (PET) and Polystyrene (PS) only degraded by 8 and 3 isolates, respectively. There are only 5 isolates that have high biodegradation index (1.5) on different polymers, which mostly on PET polymer. Isolate Ac8MP found to be the most bacteria that have degradation index on all polymers more than 1.This research proves that symbiotic bacteria could have a biodegradation mechanism on MP polymers that accumulates by sponge-host. However, further study needs to be done to understand the mechanisms and effectiveness of sponge-bacterial biodegradation activity
The analysis of density and types of mangroves on the coast of Aceh Tamiang district
Full text linkMangrove plants have the capacity to protect coastlines and inland areas from natural disasters such as hurricanes, cyclones, and tsunamis. Mangroves are one of the most productive marine ecosystems on earth, providing unique habitat for many species, as well as important goods and services for humans. Mangroves are also a spawning ground and nursery ground for various types of marine biota. The mangrove area in the Aceh Tamiang area is currently in trouble because of the many activities such as changing the function of land as ponds, housing, infrastructure development and making charcoal kitchens, which can change the function of the mangroves. For this reason, it is necessary to carry out research with the aim of mapping the distribution of mangrove ecosystems using multi-temporal satellite imagery, classifying mangroves based on their density classes and finding out the type of mangrove that is dominant in the mangrove density. This research uses the Purposive Random Sampling method as a technique for taking several scientific considerations. This research also uses the NDVI (Normalized Difference Vegetation Index) method by categorizing 3 classes in density in the Seruway, Bendahara, Banda Mulia and Manyak Payed Subdistricts in five different periods, namely 2002, 2007, 2012, 2017 and 2022. The results obtained the highest NDVI value was in 2002 at 0.98 with an area of 2152.61 ha (16.52%) and the lowest value was in 2007 at -0.23 with an area of 474.15 ha (4.47%). The total type of mangrove found in Aceh Tamiang District is 27 types. Seruway Subdistrict found the most types of mangroves, around 23 types, and in Banda Mulia Subdistrict, the fewest types of mangroves were found, around 12 types.Keywords:Mangrove ecosystemNDVI methodMangrove densityCoastal LULCMangrove typ