DEPIK Jurnal Ilmu-Ilmu Perairan, Pesisir dan Perikanan
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Marine debris in tourism area of Dodola Island Beach, Morotai Island District
Get PDFCoastal and marine areas are very vulnerable to various pollution threats from human domestic activities (marine debris), industry (fishery management) and other activities. One of the the problems faced in the management of Dodola island tourism was marine debris. This study aims to determine the composition of marine debris generated from tourism activities. Futhermore this study was necessary as basic information to formulate appropriate strategies in managing marine debris. This research was conducted from August to September 2021. Observations were made by visual observation at porposive area. Analysis of the type and weight taken from the observed waste such as the number of pieces, weight, composition and density of solid waste and separated according to the type of organic and inorganic. This result showed inorganic waste such as plastic bottles and cups, plastic packages, Styrofoam, sandals/shoes, glass bottles, diapers, cardboard and aluminum cans with a total of 664 items or 58% pieces, while for organic waste consisting of wood, bamboo, coconut and nipa fruit and banana leaves, with the number of pieces as much as 473 items or 42%. Organic waste has a weight of 203,422 grams or 85% and organic marine waste is 35,915 grams or 15%. The types of organic waste with the highest and heaviest amounts were bamboo 70.51% and 73.77%. Meanwhile, the type of inorganic waste with the highest amount was plastic bottles/cups 79.17% and the heaviest type of waste was glass bottles 55.08%.Keywords:Marine debrisGPSOrganicInorgani
Biological aspects of squid (Loligo edulis) in the waters of Eastern North Sumatra, Indonesia
Get PDFSquid is one of the non-fish resources that have economic value and is a target species in demersal fisheries activities with squid fishing gear and stick-held deep net. This research aims to determine the biological aspects of squid (Loligo edulis) such as length frequency distribution, length-weight relationship, sex ratio, gonadal maturity level, gonadal maturity index, size at first caught, and size at first maturity of the gonads. The method used in this research was a descriptive survey. The sample collection method used systematic random sampling and purposive sampling techniques. This observation was carried out on March 7 to July 30, 2022, at the Belawan Ocean Fishing Port and Tanjung Balai Port. The results showed that the average length distribution of squid was 17.73 cm. The relationship between the length and weight of squid is negative allometric. The sex ratio is 1:1.05. The negative allometric growth pattern is dominated by Gonadal Maturity Level (GML) I and GML II. The highest GML value for male squid was 2.06% at GML III, and the highest GML value for female squid was 1.92% at GML III. The average size of the caught squid length (Lc) is 10.42 cm. The size of the first gonad maturity (Lc) was 13.32 cm.Keywords:SquidBiological aspectsFisheries aspectManagement effor
Impact of ocean noise on mammalian life (case study: Samarinda waters)
Get PDFNoise pollution, or unwanted sounds in the ocean, can have a negative impact on marine mammals, especially on their biological behaviour when hunting for prey and changes in diving habits when leaving their habitat. This noise study was carried out in the waters of Samarinda with the help of a passive system acoustic instrument, which captures the range of sound intensity in the water column and supporting data in the form of sound range and activity above sea level. The sound range of 38.10-78.60 dB (A) above the water surface is safe for both everyday activities and as a habitat for mammals. Similarly, the underwater sound intensity between 0.84 and 138.47 dB re 1 Pa falls within this range. The noise condition in the study area is still expected. It can be used as an initial reference for the tolerance of sound intensity that applies to living things around the research location. The noise of the sea in Samarinda's waters has no effect on the lives of animals.Keywords:NoiseSound intensityMarine mammalHydrophoneSmartNois
Feasibility of using fish visceral trash in a polyculture system for enhancing the growth performances of giant gourami (Osphronemus gouramy) and redclaw crayfish (Cherax quadricarinatus)
Get PDFGiant gouramiand redclaw crayfish are among popular freshwater organisms with significant potential for aquaculture due to their ease of cultivation, resistance to diseases, and high economic value. Therefore, this study aimed to evaluate the feasibility of using fish visceral trash (FVT) in artificial diets to enhance the growthperformancesofgiant gourami(Osphronemus gouramy)andredclaw crayfish(Cheraxquadricarinatus)inapolyculture system.Giant gouramijuveniles (3.620.86cmand3.741.15g)andredclawcrayfish(3.050.35 cm and 6.410.29 g)were dividedinto four groups and cultured in100 L aquarium.Eachgroup was fed twice daily withdiets containing 0%, 10%,20%, and30%FVT/kgdiet. Furthermore, growth performances were assessed in all samples at14days intervals over a period of eight weeks. The resultsshowedthat diets prepared with30%FVTsignificantly affected the growth rateofgiant gourami juveniles,while those comprising20%enhanced the growth of redclaw crayfish.Total length,body weight,specific growth rate, and weight gain significantly increased in samples fed with theexperimentalcompoundeddiets. Based on the observations, it issuggestedthat using FVTcompounded diets tends to improvegrowth performancesinapolyculturesystem.Keywords:Giant gouramiGrowth performanceRedclaw crayfishPolycultureTrash fis
Estimation fish stock and composition using mark recapture studies in floodplain lake, Jambi City
Get PDFFish stock assessment can be estimated by dependent and independent sampling; Mark-recapture studies is a part of independent sampling method that can be used for it. This study was conducted in 2018 using purposive sampling methods. The purpose of this study was to determine the current status of fish stocks and the composition of fish species in the floodplain/oxbow lake, Jambi city. Interviews were conducted to determine the types of fish in this area as a reference, and then, the composition of fish species, modification of fishing gear and combine with mark-recapture sampling. The total catch was 66.5 Kg, with the dominant compositions were Hemibagrus nemurus (42%), Pangasius sp (20%), Channa lucius (12%) and the others were 26% (Osteochilus haseselti, Osteochilus bornensis, Barbonymus schwanenfeldi, Labiobarbus festivus, Thynnichthys polylepis, Mystus sp, Cryptopterus spp, Bothia macrocanthus, Labeo chrysophekadion, Barbycthys loevis and Macrobrachium rosenbergii). The conversion result of fish catches with the total area, which has been assessed using Mark-recapture studies, was 558.6 kg/ha. Finally, the total area of the floodplain was estimated at 60137 ha, and the fish stock was 66.4151.7 tons. Its showed that, allowable catch should be under this value, and Mark-recapture studies is one simple methods can be used to predict fish stock in floodplain areas.Keywords:Fish stockfloodplain lakeMark recapturemanagemen
Growth performance and survival rate of vannamei shrimp (Litopenaeus vannamei) post-larva stages in a super intensive cultivation system with varied densities
Get PDFVannamei shrimp (Litopenaeus vannamei) holds significant economic importance in Shrimponesia as a prominent shrimp commodity. The post-larval stage often encounters challenges, primarily due to the shrimp's limited ability to adapt and survive in a new environment. Stocking density is a crucial factor influencing the growth and production performance of vannamei shrimp culture. This study aims to assess the optimal stocking density for achieving optimal growth and survival in L. vannamei. A 40-day maintenance trial was conducted at UD Mina Rahayu Kalianda to investigate the impact of different stocking densities on water quality in the maintenance media. The study utilized containers with varying stocking densities: treatment A (1 shrimp/L), treatment B (1.5 shrimp/L), and treatment C (2 shrimp/L), each with three replications. The findings revealed survival rates (SR) of 83.33% for treatment A, 62.78% for treatment B, and 58.33% for treatment C. Mean Body Weight (MBW) values were recorded as 1.2592 g/shrimp for treatment A, 1.1216 g/shrimp for treatment B, and 0.7728 g/shrimp for treatment C. Average Daily Growth (ADG) results showed 0.0313 g/shrimp for treatment A, 0.0279 g/shrimp for treatment B, and 0.0192 g/shrimp for treatment C. Based on the study, the recommended stocking density for white vannamei shrimp is 40 shrimp/L, demonstrating improved growth and survival rates for this species
The assessment of status of Sibam River and Air Hitam River Pekanbaru city Riau Province using pollution index
Get PDFThe quality of the Siak River is gradually deteriorating with the rapid socio-economic development in its tributary watersheds. S. Sibam and Air Hitam are part of the Siak tributaries in the Siak tributary sub-region in Pekanbaru City. The quality of the Sibam and Air Hitam tributaries in the Siak Watershed of Pekanbaru City has been studied to determine the relative pollution level of water quality standards. Water quality measurements were carried out from January to August 2022 at the upstream, middle, and confluence with the Siak River. The pollution level of the Sibam River and Air Hitam River was measured using the pollution index method. The quality of the Sibam River and Air Hitam waters is compared to the quality standards according to The Regulation of Government of the Republicof Indonesia(RGRI) Number 22/2021 Class III. The water quality parameter measured consisted of dissolved oxygen, TSS, pH, BOD, COD, nitrate, nitrite, ammonia, and total phosphate. Pollution index calculations for the Sibam and Air Hitam rivers show light pollution, with index values ranging from 1.75 to 3.57. Nitrite and ammonia concentrations in the Sibam River do not meet quality standards. Whereas in the Air Hitam River, the BOD, nitrite, and ammonia level exceeds the quality standards (RGRI Number 22/2021 Class III). The highest pollution index is in the middle of the river, with settlements on both rivers.Keywords:Pollution IndexWater QualitySibam RiverAir Hitam Rive
Dynamics of mangrove species dominant area changes in Timbulsloko and Bedono, Demak
Get PDFMangrove forests in Timbulsloko and Bedono villages have very important benefits in minimizing abrasion, due to tidal flooding and land absorption in this area. A large number of people have planted mangroves to restore the function of mangrove forests in coastal areas which conducted by NGOs, students, government agencies, and awareness from local residents. This study aimed to determine the dynamics of mangrove area and mangrove species dominant area changes in 2016, 2018, 2020 and 2022 based on Sentinel-2 Satellite Imagery processing, and to analyze the dynamic changes based on geospatial analysis. The method used in this study is divided into two: satellite imagery data processing and field survey. The result showed that the area of mangrove species in Timbulsloko and Bedono increased from 2016 to 2022. In 2016 the area of mangroves was 140.04 ha, 159.57 ha in 2018, 171.05 ha in 2020, and 234.8 ha in 2022. The use of Sentinel 2 Satellite Imagery to map the distribution of mangrove species dominant produce overall accuracy of 84.62%. The mangrove species with the highest area are Avicennia marina followed by Avicennia alba, Rhizophora apiculata, and Rhizophora mucronate. The increase in this area of mangroves in this area is due to natural additions and artificial additions due to mangrove planting conservation by several parties and the awareness of the local residents to protect mangroves.Keywords:Mangrove SpeciesDynamicsCoastal AreaSentinel 2Remote Sensin
Molecular identification of sharks and rays species from Aceh waters, Indonesia
Get PDFShark is a cartilaginous fish that is widely hunted because it has high economic value. The waters of Aceh are directly adjacent to the Indian Ocean and the Malacca Strait making it a preferred habitat for pelagic fish, especially sharks. Information on shark species landed in the waters west and east of Aceh is very limited due to difficulties in identification and commonly used local names. This study aimed to determine the types of sharks landed in Banda Aceh, Meulaboh, Langsa, Southwest Aceh and Simeulu and to find out specifically what species of sharks are most often landed in Aceh waters. Primary data gathering consisted of four stages, namely sample collection, identification using identification books, molecular identification cytochrome oxidase subunit I (COI) and phylogenetic analysis. The results of the molecular analysis of 46 tissue samples from five locations identified 13 species of sharks, namely Carcharhinhus sorrah, Carcharhinhus amboinensis, Triaenodon obesus, Isurus oxyrinchus, Sphyrna zygaena, Sphyrna lewini, Loxodon macrorhinus, Hemipristis elongaria, Stagostoma fasciatum, Nebrius ferrugineus, Chilloscyllium punctatum, Isurus oxyrinchus, Alopias pelagicus, Alopias supercillosus and 1 species of rays, namely Rhynchobatus australiae. Phylogenetic tree reconstruction using the Neighbor Joining method of 610 basepairs consisting of two large clades separates the species Alopias pelagicus and Isurus oxyrichus with Carcharhinus sorrah, Sphyrna lewini, Loxodon macrorhinus and Rhyncobatus australiae with boostrap values of 87% and 64%. The haplotype diversity shown ranged from 0.667-0.889 while the nucleotide diversity ranged from 0.001-0.097. These values indicates high diversity because of the variance in the number of species found.Keywords:BarcodeCOISharks catchAlopias supercillosusSphyrna lewin