DEPIK Jurnal Ilmu-Ilmu Perairan, Pesisir dan Perikanan
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Estimation of mangrove sedimentary carbon stock in Deah Raya, Banda Aceh
No full textMangrove ecosystems are important blue carbon sinks, particularly through long-term carbon storage in their sediments. This study examined sediment bulk density, organic carbon content, and sediment carbon stock in the mangrove ecosystem of Deah Raya Village, Banda Aceh, Indonesia, which has regenerated following the 2004 Indian Ocean tsunami. Sediment samples were collected at three depth intervals (030 cm, 3060 cm, and 60100 cm) across three stations. Organic carbon content was determined using the Loss on Ignition (LOI) method, and carbon stock was estimated based on bulk density and carbon concentration.Bulk density ranged from 0.52 to 0.93 g cm and increased with depth, reflecting greater sediment compaction and lower organic matter accumulation. Organic carbon content varied across depths and stations, with the highest value (4.77%) recorded at Station 3 at 3060 cm, likely due to fine root biomass and reduced decomposition in anoxic layers. Sediment carbon stock ranged from 14.81 to 29.20 Mg C/ha, which is lower than national and global averages for mature mangrove systems, indicating limited carbon accumulation in this recovering ecosystem. These findings highlight the influence of vegetation structure and sediment characteristics on blue carbon storage and underscore the need for continued protection to enhance future carbon sequestration capacity.Keywords:MangroveSedimentCarbonBanda Ace
Use of mimosa (Mimosa pudica) leaf extract as an antibacterial for koi fish frys infected with Aeromonas hydrophila
No full textThis study evaluates the antibacterial potential of Mimosa pudica leaf extract for koi fry (Cyprinus carpio) infected with Aeromonas hydrophila. Specifically, it investigates the effects of immersion treatments at different concentrations, determines the optimal dose, and analyzes hematological responses. The research was conducted from December 2023 to January 2024 at the Fish Hatchery and Breeding Laboratory, Faculty of Marine and Fisheries, Syiah Kuala University. A Completely Randomized Design (CRD) was applied with six treatments A (negative control), B (positive control), C (Mimosa leaf extract 6%), D (Mimosa leaf extract 7%), E (Mimosa leaf extract 8%), and F (Mimosa leaf extract 9%) each with three replications. The results showed notable improvements in clinical symptoms of koi fry, including active swimming behavior, better feeding response, fading of red spots, reduced mucus production, normalized scales, absence of abdominal swelling, and restoration of normal eye color. ANOVA analysis of survival rate revealed a significant effect (P 0.05), with the highest survival observed in treatment F (86%) compared to treatment B (46%). In conclusion, Mimosa pudica leaf extract at a concentration of 9% (treatment F) provided the best results and can be recommended as a potential natural antibacterial for koi fry.Keywords:MimosaAeromonas hydrophilaKoi fishclinical symptom
Elevated temperatures increase chlorpyrifos toxicity in nile tilapia (Oreochromis niloticus) larvae
Full text linkGlobal warming and the extensive use of chlorpyrifos pose serious threats to the hatching success, growth, and survival of Nile tilapia larvae (Oreochromis niloticus). This study aimed to evaluate the combined effect of chlorpyrifos toxicity and elevated temperatures on tilapia larvae. A completely randomized design (CRD) was used with three temperature levels (28C, 31C, and 34C) and two chlorpyrifos concentrations (0 g/L and 32 g/L), totaling six treatments with three replicates each. Parameters observed included hatching rate, daily growth rate (DGR), specific growth rate (SGR), absolute growth rate (AGR), and malformation rate.Measurements were conducted daily from the first day of hatching until the end of the larval phase (Day 8). Results showed the highest hatching rate (85.33%) was achieved at 34C without chlorpyrifos, while the lowest rate (20%) occurred at 28C with chlorpyrifos exposure on Day 2. DGR and SGR significantly decreased at 34C with chlorpyrifos exposure, reaching 0.0003 g/day and 3.73%/day, respectively, compared to 28C without chlorpyrifos (0.0011 g/day and 10.78%/day). AGR remained stable across all temperatures, showing no significant differences with or without chlorpyrifos. The malformation rate, including abnormalities such as lordosis and kyphosis, increased with higher temperatures and chlorpyrifos exposure, with the highest rate (25%) recorded at 34C with 32 g/L chlorpyrifosKeywords:ChlorpyrifosNile TilapiaHatching RateLarval Growt
Identification of environmentally friendly of technology fishing gears in Bireuen District
Full text linkBireuen District has significant potential in fisheries resources. However, the high potential of marine fisheries comes with various threats, such as overfishing and destructive fishing, which can disrupt the sustainability of marine ecosystems. The use of environmentally friendly fishing gear is a crucial aspect of sustainability. This study aims to identify environmentally friendly fishing technologies in Bireuen District. Data collection was conducted using a descriptive method with survey techniques, observations, and structured interviews with respondents. The sampling method employed purposive sampling, selecting respondents based on specific criteria or considerations relevant to the research objectives, with a total of 50 respondents directly involved in capture fisheries in Bireuen District. Data analysis was carried out using a scoring analysis based on nine criteria for environmentally friendly fishing gear, following the guidelines of the Code of Conduct for Responsible Fisheries.The results of the study indicate that fishing gears with very environmentally friendly technology include purse seines, trolling lines, set longlines, pots, and gillnets. Meanwhile, beach seines and trammel nets are categorized as less environmentally friendly.Keywords:Fishing gearEnvironmentally FriendlyCapture fisheriesCCRFBireuen Distric
Investigation of anisakis infection and allergic potential on largehead hairtail (Trichiurus lepturus) from south coast of Yogyakarta Indonesia
Full text linkAnisakis spp. are parasites distributed worldwide that often infect marine fish species. This study investigated the prevalence, mean intensity, and Anisakis larvae species, and identified the allergenic potential of T. lepturus caught in the southern coasts of Yogyakarta, Indonesia. In total, 50 fish that were caught by the fishermen were measured for length and weight and examined for Anisakis larvae infection. The results showed that larvae were found in the abdominal cavity (87.03%), organs (7.95%), gonads (2.93%), and digestive systems (2.09%). The prevalence of Anisakis infection was high (64%), with a mean intensity of 7.47 larvae/fish. Molecular analysis revealed that the nematode was Anisakis typica. Therefore, it poses a potential health risk to humans. Consuming fish infected with Anisakis can cause allergic reactions even after the fish has been cooked. The identification was done through protein profile antigen detection of fish flesh, both infected and non-infected, using SDS-PAGE. In this study, the heating process was applied (60, 90, and 120) for 15 minutes. The result of allergenic potential detection from T. lepturus infected by Anisakis showed four protein bands correlated with Anisakis allergens Ani s 1 (24 kDa), Ani s 2 (97 kDa), Ani s 3 (41 kDa), and Ani s 7 (139 kDa) in all the infected fish, both fresh and processed.Keywords:AnisakisAllergenInfectionIntensityPrevalenc
Preliminary detection of marine debris pollution in mangrove ecosystem on Moti Island as a conservation area in North Maluku, Indonesia
Full text linkMangrove ecosystem have been recognized as a paramount area in terms of marine debris traps despite of their essential role in carbon sequestration and coastal protected. This study collected marine debris and observed mangrove conditions on Moti Island as one of the conservation area in North Moluccas. The results of this study showed that R. apiculata had the highest species composition at both stations. The mangrove density at Station 2 (622 ind.h-1) which was higher than Station 1 (589 ind.h-1). The total number of marine debris was 214 items, with the highest composition of plastic debris (96% - 97%) and the lowest was metals. Most of the marine debris was classified as macro debris. The total weight of marine debris was higher at Station 2 (1812.79 g) than at Station 1 (1727.69 g) Furthermore, the density and accumulation values of marine debris at Station 2 were higher (0.12 items.m-2 and 6.043 g.m-2) than those at Station 1 (0.063 items.m-2 and 2.879 g.m-2). The mangrove beach cleanliness index at both research stations was categorized as very clean (Station 1) and clean (Station 2). The relationship between marine debris and mangrove density showed a positive correlation despite low correlation with an r2 value of 0.24. Meanwhile, according to single way ANOVA, there was no significant difference in marine debris abundance between the two stations. Polymer identification through commercial labels implied the dominance of PET, LDPE and PP types at both stations.Keywords:Marine debrisMangrove ecosystemConservation areaMoti islandNorth Molucca
Investigation of environmental factors impact on fish catch in East Java Waters
Full text linkThis study explores the relationship between environmental parameters and fish catch rates for scad, skipjack, and yellowfin tuna in East Java waters from 2019 to 2022. The environmental factors considered include sea surface temperature (SST), chlorophyll-a concentration, and Ekman pumping velocity (EPV) as indicators of upwelling. SST and chlorophyll-a data were obtained from Aqua MODIS satellite observations, while wind and seawater density data for EPV calculations were sourced from ERA5 and SMOS-OI, respectively. Fish catch data were provided by the Department of Marine and Fisheries of East Java. Cross-correlation analysis revealed a negative correlation between SST and fish catch, with time lags of 2, 4, and 5 months for scad, skipjack, and yellowfin tuna, respectively. Chlorophyll-a concentration showed a positive correlation with fish catch, particularly for scad (0.6 with a one-month lag) and for skipjack and yellowfin tuna (0.62 with a four-month lag). Additionally, EPV exhibited a positive correlation (0.3 to 0.6) with fish catch. These findings emphasize the significance of SST and chlorophyll-a as indicators of fish population dynamics and offer valuable insights for fisheries management.Keywords:East Java WatersSea surface temperatureChlorophyll-aFishcatchUpwellin
Diversity of macroalgae in the intertidal zone of Iboih Beach, Sabang, Indonesia
Full text linkThe intertidal zone of Iboih Beach in Sukakarya District, Sabang, has significant macroalgae diversity with different substrate variations. This study examined the diversity, distribution, and ecological significance of macroalgae using the quadrat method with purposive sampling technique on three plots measuring 2 2 m (coral, sand, and rock substrates), each replicated three times. Measurements of environmental parameters including temperature (using a thermometer), salinity (refractometer), and depth (Secchi disk) were carried out prior to sampling to ensure that environmental conditions were recorded. The results showed Galaxaura rugosa as the dominant species (INP 63.22), followed by Halimeda opuntia (38.42) and Chaetomorpha crassa (35.27), which showed a preference for hard substrates rich in nutrients. In contrast, Caulerpa sp. had the lowest INP (9.33), indicating specific habitat adaptation. The Shannon-Wiener diversity index (H=1.57) was in the moderate category, with an average INP of 28.575 reflecting a diverse community occupying different ecological niches. The coral substrate supported the highest abundance due to its stability and nutrient availability. This finding confirms the crucial role of substrate characteristics in the structure of intertidal macroalgal communities.Keywords:DiversityMacroalgaeIntertidal zoneSubstrateIboih Beac
Analysis of clean water demand at the Kutaraja Fishing Port (PPS Kutaraja) Lampulo Banda Aceh
Full text linkThe Kutaraja Fishing Port (PPS Kutaraja) serves as a central hub for the fisheries sector in Aceh Province. Clean water is one of the essential facilities that plays a vital role in supporting port activities. If issues related to clean water supply are not addressed, they are predicted to affect fish quality, reduce user confidence in PPS services, and hinder operations at the port.This study aims to determine the level of clean water demand at PPS Kutaraja, Lampulo, Banda Aceh. The research was conducted from October to November 2024. The method used was a survey approach with purposive sampling techniques. Data analysis employed a quantitative descriptive method by calculating the total clean water demand, which includes clean water needs for fishing activities at sea, for ice factories, and for office use. The results of the analysis showed that the total clean water demand at PPS Kutaraja is 163,522 liters/day, clean water demand for fishing activity is 18,142 liters/day, ice plant requirement is 144,000 liters/day, and office use is 1,380 liters/day. Based on interviews and field observations, fishermen individualy need to purchase clean water from tank trucks agents. Therefore, a strategic policy is needed for clean water management at PPS Kutaraja.Keywords:Fishing PortClean Water DemandClean Water SupplyPPS KutarajaLampuloRasakan keseruan bermain di om88 dengan peluang menang yang lebih besar. Nikmati pengalaman bermain yang seru, aman, dan penuh tantangan. Segera coba dan raih kemenangan besarmu
Reproductive biology of mackerel scad (Decapterus macarellus Cuvier, 1833) in The North Halmahera waters
Full text linkStudying the biological reproduction of fish is important for determining the spawning season and providing several management options to protect the fisheries. The study conducted length and biology reproduction sampling of Mackerel scad (Decapterus macarellus) caught by mini purse seine landed in Tobelo coastal fishing port during 20152016. The total sample consisted of 1228 individuals, 526 males and 671 females with size distributions ranging from 12.50 to 29.90 cmFL. Results showed that there were 432 immature and 94 mature male fish and 582 immature and 89 mature female fish. The growth pattern for male fish is negative allometric (b3) while for females is isometric (b=3). The highest GSI value for male was recorded during May and November, while for females it was in May and October. Based on this result, the spawning season of mackerel scad in the North Halmahera waters is predicted to occur in March-May and August-October, by the first and second transition seasons. The study found that the length at first maturity (Lm) was 24.90 cmFL for male fish and 26.41 cmFL for female fish, the Lm bigger than Length at first capture (Lc) of 21.93 cmFL. This means the fish was caught before mature gonads and had a chance to spawn.Keywords:Mackerel scadSmall pelagic fishHalmahera watersGonadosomatic indexSpawning seaso