Jurnal Perikanan Universitas Gadjah Mada
Jurnal Perikanan Universitas Gadjah Mada are published to promote a critical review of the various investigative issues of interest in the field of fisheries between the researchers, academics, students and the general public, as a medium for communication, dissemination, and utilization of wider scientific activities.
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<![CDATA[Growth Performance of Silkworms (Tubifex sp.) Cultivated Using a Dry Substrate ]]>
<![CDATA[Mhd Yazid]]>;
<![CDATA[Iin Siti Djunaidah]]>;
<![CDATA[Moch Nurhudah]]>
<![CDATA[ Jurnal Perikanan Universitas Gadjah Mada Vol 24, No 2 (2022) ]]>
Publisher : <![CDATA[Universitas Gadjah Mada ]]>
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DOI: 10.22146/jfs.68259
<![CDATA[Silkworms are one type of live food that has begun to be intensified in their cultivation activities in Indonesia. This study aimed to determine the effect of feeding/dried substrate in different doses on the growth performance of silkworms. The second aim was to determine the appropriate dose of dry substrate for silkworm cultivation. The study used a completely randomized design (CRD) with 4 treatments of dry media at a dose of 114 g/m2 (D10), 228 g/m2 (D20), and 324 g/m2 (D30) dan without media as a control (D0). With 3 replications for each treatment. A silkworm starter was obtained from cultivation for 30 days. The research was conducted at Warung Benih Farm in Depok for 33 days. Data were analyzed using Analysis of Variance (ANOVA) and Duncan's further test with a confidence level of 0.05. The results showed that absolute weight growth, population growth, and the best productivity were obtained in the treatment of substrate addition with a dose of 324 g/m2 (D30) with an absolute biomass growth of 48.67 g, population growth of 59458 individuals, & the productivity of 0.556 g/m2 was/cycle. Most of the water quality observations are in the relatively optimal range.]]>
<![CDATA[Changes in Condition Factor, Hepatosomatic and Gonadosomatic Index of Yellowfin Tuna (Thunnus albacares) in Captivity ]]>
<![CDATA[Jhon Harianto Hutapea]]>;
<![CDATA[Ananto Setiadi]]>;
<![CDATA[Gunawan Gunawan]]>
<![CDATA[ Jurnal Perikanan Universitas Gadjah Mada Vol 24, No 2 (2022) ]]>
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DOI: 10.22146/jfs.68351
<![CDATA[The necessity for tuna products in the world community continues to increase, while production relies only on catching, thus causing overfishing. Therefore, breeding technology to support tuna farming is fundamental to be developed. Yellowfin tuna farming in Indonesia has been successful in cultivating broodstock. This paper discusses biometric data that changes during cultivation, such as condition factor, hepato and gonadosomatic indexes compared with wild captured. Data were collected from young tuna to broodstock and compared with wild captured such as fork length, body, liver and gonad weight. The condition factor (K) of cultivated tuna (1.5-2.5) was higher compared with wild captured (1.5-2.0). Similarly, the value of cultivated tuna’s hepatosomatic index (HSI) was higher (0.63-1.14). In contrast, the gonadosomatic index (GSI) of wild captured yellowfin tuna was higher (>0.5) compared with cultivated yellowfin tuna in a circular concrete tank (0.4) but lower than that cultivated in a floating net cage (>1.4). Maintenance of broodstock in the tank with a lower GSI value means the number of eggs produced is relatively lower than its natural counterpart. At the same time, the high GSI value of cultivated broodstock in FNC shows better results than wild captured broodstock.]]>
<![CDATA[The Potential Secondary Metabolites of Macroalgae Sargassum polycystum C. Agardh (1824) from the coast of West Aceh as Raw Material of Body Scrub ]]>
<![CDATA[Mohamad Gazali]]>;
<![CDATA[Nurjanah Nurjanah]]>;
<![CDATA[Amir Husni]]>;
<![CDATA[Chairun Nufus]]>;
<![CDATA[Bintan Rahma Aulia]]>;
<![CDATA[Citra Dina Febrina]]>;
<![CDATA[Rina Syafitri]]>
<![CDATA[ Jurnal Perikanan Universitas Gadjah Mada Vol 24, No 2 (2022) ]]>
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DOI: 10.22146/jfs.70504
<![CDATA[Sargassum polycystum is one brown seaweed with a rich alginate source. The previous study showed that S. polycystum could be used as a cosmeceutical raw material because of its natural attribute and safe. S. polycystum always grows in many coastal of Indonesia. This study aims to characterise brown seaweed (S. polycystum) as the raw material of the body scrub. The research method includes the extraction, phytochemical assay, antioxidant assay, and total phenolic content-the phytochemical screening-detected alkaloid and steroid compounds in S. polycystum extract. The antioxidant activity by using the CUPRAC method showed the ethanol extract was 53.55±1.07 µM/g and FRAP was 201.95±6.33 µM/g with total phenolic content was 177.647±21.39 Mg GAE/g. We compared the antioxidant capacity of the body scrub by adding brown seaweed of S. polycystum 7% (S7) used the CUPRAC method was 34.23±0.33 µM/g, and FRAP was 124.05±1.87 µM/g with total phenolic content was 416.31±78.44 Mg GAE/g. Kruskal Wallis's analysis showed that adding brown seaweed S. polycystum with different formulas influenced the panellist's preference for smearing ability, odor, texture, colour, and consistency parameters. According to the Mean rank obtained, the level of preferences of the panellists was gained from product S7 namely body scrub with the addition of brown seaweed S. polycystum as much as 7%. It is indicated that the brown seaweed S. polycystum possesses potentially body scrub raw material that is prospective in the cosmeceutical industry. ]]>
<![CDATA[Reproductive Biodynamics of Short Mackerel (Rastreliger brachyoma Bleeker, 1851) in the Northern Waters Makassar Strait, Indonesia ]]>
<![CDATA[Wayan Kantun]]>;
<![CDATA[Ardi Eko Mulyawan]]>;
<![CDATA[Hadijah Mahyuddin]]>
<![CDATA[ Jurnal Perikanan Universitas Gadjah Mada Vol 24, No 2 (2022) ]]>
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DOI: 10.22146/jfs.72728
<![CDATA[Short mackerel are caught with high intensity by the fisherman and using various fishing gear. It is feared that this activity could change the reproduction habits of short mackerel in ther habitat. This study aims to analyze the bio-dynamics reproduction of short mackerel, including sex ratio, maturity stage, length at first maturity, length at first spawning, and fecundity. The survey method obtained the sample collection from the fish landing sites. Samples were collected in 1320 samples consisting of 651 females (13.0-16.5 cm) and 669 males (13.3-17.4 cm). The results showed that the sex ratio was balanced (1.00:1.02), the stage of gonad maturity showed from immature gonad to spawning (I to V), and the highest gonad maturity index for males and females were found in July (1.609 and 1.794). The length at first maturity of males and females had occurred when they were 16.51 cm and 16.63 cm, and the length at first spawning for males and females was 17.12 cm and 17.03 cm in size. The fecundity of female mackerel ranges from 30.106 to 58.439 in the northern waters of Makassar Strait. Capturing fish is suggested with a length above the spawned fish (>17 cm), considering that the fish only spawn at least once from their life cycle. The fecundity of short mackerel is relatively high as an indicator of high reproductive potential.]]>
<![CDATA[Reef Fish Species Diversity Using Environmental DNA Metabarcoding in Mansinam and Lemon Island Waters, Manokwari Regency ]]>
<![CDATA[Bayu Pranata]]>;
<![CDATA[Aradea Bujana Kusuma]]>;
<![CDATA[Muhamad Ilham Azhar]]>
<![CDATA[ Jurnal Perikanan Universitas Gadjah Mada Vol 24, No 2 (2022) ]]>
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DOI: 10.22146/jfs.73037
<![CDATA[Biodiversity has an essential role in the stability of an ecosystem. A high level of biodiversity indicates a more stable and stable ecosystem. The decline in the quality of ecosystems such as coral reefs, seagrass beds, and mangrove forests due to anthropogenic factors and global warming threaten biodiversity. This study aims to determine the diversity of reef fish species using an environmental DNA (eDNA) approach in the waters of the Mansinam and Lemon, Manokwari Regency islands. The analysis results detected 158 individual fish comprising 26 species from 10 families (sequence identity 97-100%). The highest species abundance was found in the Pomacentridae Family. The Pomacentridae family is an ornamental fish species in coral reef ecosystems. In addition, several species from the families Serranidae, Caesionidae, Mullidae, Holocentridae, Balistidae, Scaridae, and Labridae were also detected; fish species from these families are catch targets for fishers with economic value. Assessment of fish species diversity using the Shannon-Wiener method. The diversity of fish species in the waters of the islands of Mansinam and Lemon is in the high category, namely 3.17. High diversity indicates a stable and stable ecosystem condition.]]>
<![CDATA[Osteocranium of the Sailfish (Istiophorus platypterus, Shaw & Nodder, 1792) from Malacca Strait ]]>
<![CDATA[Yusrizal Akmal]]>;
<![CDATA[Mujibul Rahman]]>;
<![CDATA[Muliari Muliari]]>;
<![CDATA[Agung Setia Batubara]]>
<![CDATA[ Jurnal Perikanan Universitas Gadjah Mada Vol 24, No 2 (2022) ]]>
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DOI: 10.22146/jfs.73573
<![CDATA[The features and morphometrics of the sailfish's osteocranium are examined in this study (Istiophorus platypterus, Shaw & Nodder, 1792). I. platypterus has a total weight of ±20 kg with a total length of ±218 cm. The stages of the research process included preparing samples, preparing osteocraniums, documenting photos, editing images, and identifying terminology related to osteocraniums. The Laboratory of Mathematics and Natural Sciences at Almuslim University handled every aspect of the research. The osteocranium preparation process was carried out physically and chemically. Each bone was documented using a camera and edited using Adobe Photoshop CS6. The neurocranium is divided into four components: the olfactory (ethmoidal), which comprises 6 bones. The orbitale comprises 4 bones, the otic comprises 5, and the occipital comprises 4 bones. The branchiocranium is divided into five components: the oromandibular structure consisting of 3 bones, the mandibular arc (suspensorium) composed of 4 bones, the opercular apparatus consisting of 4 bones, and the hyoid arc composed of 6 bones, and the branchial arc composed of 4 bones.]]>
<![CDATA[Some Aspects of the Reproductive of Japanese Threadfin Bream (Nemipterus japonicus Bloch, 1791) Caught in the Area Around the Artificial Reef In the Pitu Sunggu Waters of the Makassar Strait ]]>
<![CDATA[Wayan Kantun]]>;
<![CDATA[Wilma Moka]]>
<![CDATA[ Jurnal Perikanan Universitas Gadjah Mada Vol 24, No 2 (2022) ]]>
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DOI: 10.22146/jfs.73629
<![CDATA[Japanese Threadfin Bream is a demersal fish commonly found around artificial reefs. Food availability in the artificial reef ecosystem is essential for the sustainability of this species. Hence, this research aimed to determine several aspects of bio-reproduction of Japanese Threadfin Bream caught in the artificial reef (bioreeftek). Samples were taken using handline fishing, twice a month (April-July 2020) in Pitu Sunggu Waters, Makassar Strait. The samples were observed for its reproduction aspects. The result showed that the Japanese Threadfin Bream fish caught have a balanced sex ratio between males and females, 1:1.03. The analysis of the gonad maturity stage obtained was II-IV, and the gonado somatic index ranged from 0.541-0.940 for males and 1.156-2.358 for females. The first mature Japanese Threadfin Bream size was 18.29 cm for males and 16.99 cm for females. The Japanese Threadfin Bream fish fecundity ranged between 35.042-42.061 eggs.]]>
<![CDATA[The Ratio of Storage Volume to Cubic Number for Rampus Nets at The Karangantu Archipelago Fishery Port-Banten ]]>
<![CDATA[Annisa Ramadhanti]]>;
<![CDATA[Yopi Novita]]>;
<![CDATA[Mohammad Imron]]>;
<![CDATA[Tri Nanda Citra Bangun]]>;
<![CDATA[Budhi Hascaryo Iskandar]]>
<![CDATA[ Jurnal Perikanan Universitas Gadjah Mada Vol 24, No 2 (2022) ]]>
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DOI: 10.22146/jfs.73658
<![CDATA[The Banten Province Maritime Affairs and Fisheries Service plans to standardize the hold volume for fishing vessels in its management area. The management plan is still challenging to implement because there is no information about the vessel storage volume. In addition, small fishing vessel fishers still store their catch in boxes made of fibre-reinforced plastic (FRP). That box is often placed on the deck floor, causing decreased vessel stability. The size of the available storage volume on the vessel must be ideal, so it needs to be compared with the cubic number. This research aims to determine the optimal storage volume to cubic number ratio for rampus net vessels with the best stability conditions. The sampling technique used was accidental sampling with a total sample of 10% from 72 fishing vessels. Data processing used mathematical calculations and stability simulation with the GZ program. Analysis of the data used is descriptive analysis. The results showed that the optimal ratio of storage volume to cubic number for vessels with sizes 3-5 GT ranged from 5.03 - 8.55%. That ratio was a storage condition designed inside the hull construction, and the catch is directly put into the store without using the FRP box. From the stability point of view, condition 3 is the best for the quality of fishing vessel’s stability. This due to the lowest value of KG in condition 3 comparing to other conditions.]]>
<![CDATA[Effect of Peat Water Mix with Borehole Water on Mortality of African Catfish ]]>
<![CDATA[Ardianor Ardianor]]>;
<![CDATA[Tutwuri Handayani]]>;
<![CDATA[Noor Syarifuddin Yusuf]]>;
<![CDATA[Rosana Elvince]]>
<![CDATA[ Jurnal Perikanan Universitas Gadjah Mada Vol 24, No 2 (2022) ]]>
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DOI: 10.22146/jfs.73848
<![CDATA[Generally, cultured fish are suitable in media with a pH of around 7, like mountainous river and borehole water. However, peat water is known with low pH. It is not suitable for fish culture, especially for fingerlings. This study was conducted to examine the survival of African catfish fingerling (Clarias gariepinus) in the mixture of peat and borehole water with different pHs. Survival test of African catfish as subject applied bioassay method, LC50-96 hours. Peat water as the agent was arranged for 11 concentration levels of 0% - 100% with no replication and placed in plastic basins with 20 liters each. Catfish fingerlings were used for subject fish (size 10-15 cm) and 10 individuals in each basin. Water quality, mortality, and behavior of fish were observed. Results showed that the survival ability of African catfish on peat water, the LC50-96 hours was 63.8%, with 95% CI between 53.3% and 76.4% in concentration. Behavioral response of fish fingerling exposed to peat water ≥ 40% in the beginning 2 hours was frequently swimming up to surface. Lethal responses fingerlings were frequently taking up oxygen to the water surface, horizontally swimming, and moving vertically before death. After death, the fish ran out of mucus, and the skin looked peeling and bruising.]]>
<![CDATA[Influence of In-stream Ecosystem Restoration Techniques on the Fish Ecology of the River Nabongo in Eastern Uganda ]]>
<![CDATA[Remigio Turyahabwe]]>;
<![CDATA[Muhamud Wambedde Nabalegwa]]>;
<![CDATA[Joyfred Asaba]]>;
<![CDATA[Andrew Mulabbi]]>
<![CDATA[ Jurnal Perikanan Universitas Gadjah Mada Vol 24, No 2 (2022) ]]>
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DOI: 10.22146/jfs.73889
<![CDATA[The study was the first in Uganda to assess the responses of fish community assemblages to introduced woody debris structures in a tropical river in Eastern Uganda. For comparison purposes, two different woody debris structures (simple and complex) were introduced in river Nabongo, and their effect on fish assemblage and feeding was established based on experiments conducted in two heterogeneous stream environments (a pool and a riffle). Results showed that sampling plots treated with restoration structures registered higher fish species richness, diversity, and abundance than sampling plots without restoration structures (control plots) at each site. The study (experiment) applied a stratified sampling design which used purposive identification of a pool and a riffle in River Nabongo Catchment. Fish were captured using a drift net, an electro-fishing gear, and a hand net. Data were analysed using a one-way ANOVA generated from STATA version 14. At the pool site, total fish density varied significantly from plot to plot (P<0.05) but was highest in the complex structures with 64±1.08 fishes/m2 and lowest with 24±0.82 fishes/m2 in untreated plots. K-factor did not vary significantly in untreated plots at the pool site but significantly differed from treated plots at P<0.05. The relative abundance of fish species at the pool site was highest in the complex structures with 40.7±0.66% and 21.5±0.42% before structures but was least in the control plot, varying significantly from plot to plot at P<0.05. It was concluded that woody debris restoration is an effective stream restoration technique. Fish individuals, trophic groups, and taxa more densely colonised sampling plots that had structures than those that did not have structures.]]>
