Pub Date : 2021-10-08DOI: 10.24843/jmas.2021.v07.i01.p07
M. A. Pratiwi, G. Kartika
The aimed of this study was to determine the reproductive biology aspects of longtail tuna, namely the gonad maturity level, gonadal maturity index, fecundity and length of first maturity. Fish samples were obtained from the catches of fishermen in the Bali Strait which landed at PPP Muncar from December 2018 to February 2019. Gonad maturity level of longtail tuna in December 2018 was mostly found in immature conditions (TKG I). TKG III and IV are most commonly found in February. The highest IKG value was found in February 2019 (0.017). This can be interpreted that lontail tuna experienced peak spawning and was actively reproducing in February. The sex ratio of gray tuna is dominated by male. Fecundity at TKG III ranged from 18,800 to 33,200 grains and at TKG IV of 154,000 grains. The length of first maturity of longtail tuna was 495 mmFL (male) and was 487 mmFL (female).
{"title":"Biologi Reproduksi Ikan Tongkol Abu-Abu (Thunnus tonggol Bleeker, 1851) Yang Tertangkap Di Perairan Selat Bali","authors":"M. A. Pratiwi, G. Kartika","doi":"10.24843/jmas.2021.v07.i01.p07","DOIUrl":"https://doi.org/10.24843/jmas.2021.v07.i01.p07","url":null,"abstract":"The aimed of this study was to determine the reproductive biology aspects of longtail tuna, namely the gonad maturity level, gonadal maturity index, fecundity and length of first maturity. Fish samples were obtained from the catches of fishermen in the Bali Strait which landed at PPP Muncar from December 2018 to February 2019. Gonad maturity level of longtail tuna in December 2018 was mostly found in immature conditions (TKG I). TKG III and IV are most commonly found in February. The highest IKG value was found in February 2019 (0.017). This can be interpreted that lontail tuna experienced peak spawning and was actively reproducing in February. The sex ratio of gray tuna is dominated by male. Fecundity at TKG III ranged from 18,800 to 33,200 grains and at TKG IV of 154,000 grains. The length of first maturity of longtail tuna was 495 mmFL (male) and was 487 mmFL (female).","PeriodicalId":30849,"journal":{"name":"Journal of Marine and Aquatic Sciences","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47926884","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-06DOI: 10.24843/jmas.2021.v07.i01.p06
Ni Luh Putu Ria Puspitha
Layang deles is one of the highest catches landed in PPN Pengambengan. PPN Pengambengan is a strategic fishery port owned by Jembrana with a function as a center or center for marine fisheries landing. Improvement of fishing technology will be related to the problem of abundance or availability of fishery resoure stocks, so it is necessary to study CPUE, MSY and JTB so that they can utilize the resources with optimal but still maintain its preservation in nature. This research has a purpose, which is to know the trend of CPUE, MSY and JTB of layang deles fish (Decapterus macrosoma) landed in PPN Pengambengan. The method used is a quantitative descriptive method using a surplus production analysis from Schaefer. The data used in this study are catch and fleet data from 2014 – 2019 obtained directly from the PPN Pengambengan office. The results showed the highest CPUE in 2015 amounted to 6,12 tons/fleet, but after that the CPUE trend tended to decline, especially since 2016 while the MSY value was obtained at 3.348,9 tons/year with a maximum sustained effort of 1.830 fleets/year. Furthermore, the JTB value is 80% of the MSY value, a figure of 2.679,12 tons/year is obtained. This indicates overfishing and over-exploitation in the PPN Pengambengan area. To prevent overfishing and over-exploitation, prevention can be done, such as limiting fishing capacity and effort can also apply fisheries management models, such as co-management and EBFM (eco-based fisheries management).
{"title":"Pendugaan CPUE dan Potensi Maksimum Lestari Ikan Layang Deles (Decapterus macrosoma) yang Didaratkan di PPN Pengambengan, Jembrana - Bali","authors":"Ni Luh Putu Ria Puspitha","doi":"10.24843/jmas.2021.v07.i01.p06","DOIUrl":"https://doi.org/10.24843/jmas.2021.v07.i01.p06","url":null,"abstract":"Layang deles is one of the highest catches landed in PPN Pengambengan. PPN Pengambengan is a strategic fishery port owned by Jembrana with a function as a center or center for marine fisheries landing. Improvement of fishing technology will be related to the problem of abundance or availability of fishery resoure stocks, so it is necessary to study CPUE, MSY and JTB so that they can utilize the resources with optimal but still maintain its preservation in nature. This research has a purpose, which is to know the trend of CPUE, MSY and JTB of layang deles fish (Decapterus macrosoma) landed in PPN Pengambengan. The method used is a quantitative descriptive method using a surplus production analysis from Schaefer. The data used in this study are catch and fleet data from 2014 – 2019 obtained directly from the PPN Pengambengan office. The results showed the highest CPUE in 2015 amounted to 6,12 tons/fleet, but after that the CPUE trend tended to decline, especially since 2016 while the MSY value was obtained at 3.348,9 tons/year with a maximum sustained effort of 1.830 fleets/year. Furthermore, the JTB value is 80% of the MSY value, a figure of 2.679,12 tons/year is obtained. This indicates overfishing and over-exploitation in the PPN Pengambengan area. To prevent overfishing and over-exploitation, prevention can be done, such as limiting fishing capacity and effort can also apply fisheries management models, such as co-management and EBFM (eco-based fisheries management).","PeriodicalId":30849,"journal":{"name":"Journal of Marine and Aquatic Sciences","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48088526","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-06-01DOI: 10.24843/jmas.2021.v07.i01.p05
G. Kartika, E. W. Suryaningtyas
One treatment to increase the productivity of tilapia fish farming is by administering probiotics. Natural probiotics, besides it is safe for consumers, it is also very environmentally friendly because it is obtained from natural. The stem of banana (Musa paradisiaca) is organic waste that is commonly found in Indonesia. In the banana stems, they contain carbohydrates, protein, water, and essential minerals that can be used by microorganisms (bacteria) to evolve. Research conducted explorative research, by identifying lactic acid bacteria (BAL) potentially isolated from the banana stem probiotics (Musa paradisiaca) In specific media MRSA BCP and the addition of probiotics banana stems on Tilapia fish feed to see the effectiveness of the use of probiotics in tilapia culture. The result showed the density of lactic acid bacteria probiotic banana stems on the first day 0, day three: 1.63 x 107, the seventh day: 3:20 x 107, and the fourteenth day: 0. Results of testing the addition of probiotics in the feed of tilapia showed that tilapia given feed with probiotics that had specific growth rate and absolute growth is higher than the tilapia fed without probiotics.
{"title":"Kandidat Probiotik Ramah Lingkungan Dari Batang Pisang (Musa Paradisiaca) Untuk Peningkatan Produksi Ikan Nila (Orechromis niloticus)","authors":"G. Kartika, E. W. Suryaningtyas","doi":"10.24843/jmas.2021.v07.i01.p05","DOIUrl":"https://doi.org/10.24843/jmas.2021.v07.i01.p05","url":null,"abstract":"One treatment to increase the productivity of tilapia fish farming is by administering probiotics. Natural probiotics, besides it is safe for consumers, it is also very environmentally friendly because it is obtained from natural. The stem of banana (Musa paradisiaca) is organic waste that is commonly found in Indonesia. In the banana stems, they contain carbohydrates, protein, water, and essential minerals that can be used by microorganisms (bacteria) to evolve. Research conducted explorative research, by identifying lactic acid bacteria (BAL) potentially isolated from the banana stem probiotics (Musa paradisiaca) In specific media MRSA BCP and the addition of probiotics banana stems on Tilapia fish feed to see the effectiveness of the use of probiotics in tilapia culture. The result showed the density of lactic acid bacteria probiotic banana stems on the first day 0, day three: 1.63 x 107, the seventh day: 3:20 x 107, and the fourteenth day: 0. Results of testing the addition of probiotics in the feed of tilapia showed that tilapia given feed with probiotics that had specific growth rate and absolute growth is higher than the tilapia fed without probiotics.","PeriodicalId":30849,"journal":{"name":"Journal of Marine and Aquatic Sciences","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49641529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-06-01DOI: 10.24843/jmas.2021.v07.i01.p04
Ima Yudha Perwira, Nyoman Dati Pertami, Devi Ulinuha, Farhan Danu Fauzan
The aimed of this study was to determine the reproductive biology aspects of longtail tuna, namely the gonad maturity level, gonadal maturity index, fecundity and length of first maturity. Fish samples were obtained from the catches of fishermen in the Bali Strait which landed at PPP Muncar from December 2018 to February 2019. Gonad maturity level of longtail tuna in December 2018 was mostly found in immature conditions (TKG I). TKG III and IV are most commonly found in February. The highest IKG value was found in February 2019 (0.017). This can be interpreted that lontail tuna experienced peak spawning and was actively reproducing in February. The sex ratio of gray tuna is dominated by male. Fecundity at TKG III ranged from 18,800 to 33,200 grains and at TKG IV of 154,000 grains. The length of first maturity of longtail tuna was 495 mmFL (male) and was 487 mmFL (female).
{"title":"Profil Nitrat dan Fosfat pada Air secara Vertikal di Danau Batur, Bali","authors":"Ima Yudha Perwira, Nyoman Dati Pertami, Devi Ulinuha, Farhan Danu Fauzan","doi":"10.24843/jmas.2021.v07.i01.p04","DOIUrl":"https://doi.org/10.24843/jmas.2021.v07.i01.p04","url":null,"abstract":"The aimed of this study was to determine the reproductive biology aspects of longtail tuna, namely the gonad maturity level, gonadal maturity index, fecundity and length of first maturity. Fish samples were obtained from the catches of fishermen in the Bali Strait which landed at PPP Muncar from December 2018 to February 2019. Gonad maturity level of longtail tuna in December 2018 was mostly found in immature conditions (TKG I). TKG III and IV are most commonly found in February. The highest IKG value was found in February 2019 (0.017). This can be interpreted that lontail tuna experienced peak spawning and was actively reproducing in February. The sex ratio of gray tuna is dominated by male. Fecundity at TKG III ranged from 18,800 to 33,200 grains and at TKG IV of 154,000 grains. The length of first maturity of longtail tuna was 495 mmFL (male) and was 487 mmFL (female).","PeriodicalId":30849,"journal":{"name":"Journal of Marine and Aquatic Sciences","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46910761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-02-25DOI: 10.24843/jmas.2021.v07.i01.p03
Gede Kamajaya, I. N. W. Putra, I. N. W. Putra
Total suspended solid is a suspended solid that causes turbidity in the waters. These particles cannot settle directly on the bottom of the water. TSS size and weight are smaller than sediment. TSS concentration if too high will inhibit the penetration of light into the water and result in disruption of photosynthesis. The number of human activities around the waters of Benoa Bay can produce pollutant waste into the waters which can cause negative impacts on the conditions of marine life. This TSS value is one part that plays a role in determining the environmental quality of a waters. Seeing the input from the rivers which empties into Benoa Bay, the need for research in the Benoa Bay area is related to total suspended solids. Technological developments, especially in remote sensing, make the implementation of mapping the distribution of TSS concentrations efficient. The method in this study used Landsat 8 satellite images and in situ data. This research was conducted in May 2018. The research location consisted of 30 points by purposive sampling. The TSS concentration value in situ has an average concentration of 301.65 mg / L. Middle waters have greater concentration because this is due to the effects of tides. TSS concentration values from images can be calculated using the Budhiman, Guzman and Parvati algorithms. The results of the calculation of the three algorithms have an error value above 30%. This may be due to differences in water conditions which result in differences in concentration from the insitu value and the value of satellite images in the waters of Benoa Bay.
{"title":"Analisis Sebaran Total Suspended Solid (TSS) Berdasarkan Citra Landsat 8 Menggunakan Tiga Algoritma Berbeda Di Perairan Teluk Benoa, Bali","authors":"Gede Kamajaya, I. N. W. Putra, I. N. W. Putra","doi":"10.24843/jmas.2021.v07.i01.p03","DOIUrl":"https://doi.org/10.24843/jmas.2021.v07.i01.p03","url":null,"abstract":"Total suspended solid is a suspended solid that causes turbidity in the waters. These particles cannot settle directly on the bottom of the water. TSS size and weight are smaller than sediment. TSS concentration if too high will inhibit the penetration of light into the water and result in disruption of photosynthesis. The number of human activities around the waters of Benoa Bay can produce pollutant waste into the waters which can cause negative impacts on the conditions of marine life. This TSS value is one part that plays a role in determining the environmental quality of a waters. Seeing the input from the rivers which empties into Benoa Bay, the need for research in the Benoa Bay area is related to total suspended solids. Technological developments, especially in remote sensing, make the implementation of mapping the distribution of TSS concentrations efficient. The method in this study used Landsat 8 satellite images and in situ data. This research was conducted in May 2018. The research location consisted of 30 points by purposive sampling. The TSS concentration value in situ has an average concentration of 301.65 mg / L. Middle waters have greater concentration because this is due to the effects of tides. TSS concentration values from images can be calculated using the Budhiman, Guzman and Parvati algorithms. The results of the calculation of the three algorithms have an error value above 30%. This may be due to differences in water conditions which result in differences in concentration from the insitu value and the value of satellite images in the waters of Benoa Bay.","PeriodicalId":30849,"journal":{"name":"Journal of Marine and Aquatic Sciences","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44539228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-02-19DOI: 10.24843/jmas.2021.v07.i01.p02
Mahfud Samdani, I. Restu, Rani Ekawaty
The study of economically important fish which is landed at Fishing Landing Base (PPI) Kedonganan District Kuta Selatan Badung Regency was held on 1 Februri s.d 31 March 2017 (west season). Objective is to inventory list of types of fish economically important which is landed in PPI Kedonganan Badung regency. The research was conducted using direct survey method with purposive sampling technique of fish landed PPI Kedonganan, the data were analyzed using descriptive analysis. The identification process was carried out by using identification keys from Saanin (1984) volumes I and II, and an important economic fish identification book from Peristiwady (2006). Based on the results of the study, there were 16 important types of important fish landed in PPI Kedonganan in the west season, which entered in the classification of 4 orders (perciformes, apodes, clupeiformes, and beloniformes), and 9 families consisting of 16 Species. Of the 4 orders, the most frequencies and volumes found were the perciformes with the tuna fish species, the sardines (Sardinella fimbriate), and the kawa-kawa (Euthynnus afinis). The least-discovered species are baronang (Siganus guttatus), flying fish (Cheilopogon sp) in the order of beloniformes, and kembung fish (Restrelliger sp). Comparison of production data in the west season with fish landing production data in PPI Kedonganan in other seasons, that types of fish are found relatively few species and the volume is lower. This means that the west season gives effect to the catch of fish that was declared in PPI Kedonganan.
{"title":"Inventarisasi Ikan Ekonomis Penting pada Musim Barat di PPI Kedonganan, Bali","authors":"Mahfud Samdani, I. Restu, Rani Ekawaty","doi":"10.24843/jmas.2021.v07.i01.p02","DOIUrl":"https://doi.org/10.24843/jmas.2021.v07.i01.p02","url":null,"abstract":"The study of economically important fish which is landed at Fishing Landing Base (PPI) Kedonganan District Kuta Selatan Badung Regency was held on 1 Februri s.d 31 March 2017 (west season). Objective is to inventory list of types of fish economically important which is landed in PPI Kedonganan Badung regency. The research was conducted using direct survey method with purposive sampling technique of fish landed PPI Kedonganan, the data were analyzed using descriptive analysis. The identification process was carried out by using identification keys from Saanin (1984) volumes I and II, and an important economic fish identification book from Peristiwady (2006). Based on the results of the study, there were 16 important types of important fish landed in PPI Kedonganan in the west season, which entered in the classification of 4 orders (perciformes, apodes, clupeiformes, and beloniformes), and 9 families consisting of 16 Species. Of the 4 orders, the most frequencies and volumes found were the perciformes with the tuna fish species, the sardines (Sardinella fimbriate), and the kawa-kawa (Euthynnus afinis). The least-discovered species are baronang (Siganus guttatus), flying fish (Cheilopogon sp) in the order of beloniformes, and kembung fish (Restrelliger sp). Comparison of production data in the west season with fish landing production data in PPI Kedonganan in other seasons, that types of fish are found relatively few species and the volume is lower. This means that the west season gives effect to the catch of fish that was declared in PPI Kedonganan.","PeriodicalId":30849,"journal":{"name":"Journal of Marine and Aquatic Sciences","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48176072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-02-03DOI: 10.24843/jmas.2021.v07.i01.p01
I. W. G. Astrawan, Elok Faiqoh, I. Dharma
The Indonesian archipelago is a region with high marine diversity, especially in the coral reef ecosystem. Coral reefs have ecological functions such as habitat and foraging. However, coral reefs facing various threats including land pollution, fishing effects, climate change, and coral reef depletion caused by ocean acidity. The condition of coral reefs in Pemuteran waters now is much different from a few years ago. Many organisms symbiosis in living and dead corals, especially crabs. Water depth can affect the abundance of crabs. This study was to determine the level of crab diversity on dead corals (Acropora sp. And Pocillopora sp.) Based on differences in depth. The water depth was divided into 5 and 20 meters. Each depth is taken by three Acropora sp. and three Pocillopora sp. The types of crabs that obtained consist of the family Cheiragonidae, Eriphiidae, Leucosiidae, Majidae, Pilumnidae, Pinnotheridae, Porcellanidae, Xanthidae, Portunidae, and Goneplaciade. Highest composition of crab species in Acropora sp. depth of 5 meters 60% (Xanthidae) and depth of 20 meters 37% (Portunidae and Pilumnidae). Highest composition of crab species in Pocillopora sp. A depth of 5 meters 34% (Xanthidae) and depth of 20 meters by 37% (Pilumnidae). The highest density of Acropora sp. is 37.03 ind/cm2 and Pocillopora sp. is 229.63 ind / cm2. The diversity index analysis of crabs at 2 depths category is moderate, which means that the balance in the ecosystem is unstable, where there are some of species with low and high tolerance levels if there is a change in pressure from the environment.
{"title":"Keanekaragaman Kepiting pada Dead Coral (Pocillopora sp. dan Acropora sp.) Berdasarkan Perbedaan Kedalaman Di Perairan Teluk Pemuteran, Buleleng, Bali","authors":"I. W. G. Astrawan, Elok Faiqoh, I. Dharma","doi":"10.24843/jmas.2021.v07.i01.p01","DOIUrl":"https://doi.org/10.24843/jmas.2021.v07.i01.p01","url":null,"abstract":"The Indonesian archipelago is a region with high marine diversity, especially in the coral reef ecosystem. Coral reefs have ecological functions such as habitat and foraging. However, coral reefs facing various threats including land pollution, fishing effects, climate change, and coral reef depletion caused by ocean acidity. The condition of coral reefs in Pemuteran waters now is much different from a few years ago. Many organisms symbiosis in living and dead corals, especially crabs. Water depth can affect the abundance of crabs. This study was to determine the level of crab diversity on dead corals (Acropora sp. And Pocillopora sp.) Based on differences in depth. The water depth was divided into 5 and 20 meters. Each depth is taken by three Acropora sp. and three Pocillopora sp. The types of crabs that obtained consist of the family Cheiragonidae, Eriphiidae, Leucosiidae, Majidae, Pilumnidae, Pinnotheridae, Porcellanidae, Xanthidae, Portunidae, and Goneplaciade. Highest composition of crab species in Acropora sp. depth of 5 meters 60% (Xanthidae) and depth of 20 meters 37% (Portunidae and Pilumnidae). Highest composition of crab species in Pocillopora sp. A depth of 5 meters 34% (Xanthidae) and depth of 20 meters by 37% (Pilumnidae). The highest density of Acropora sp. is 37.03 ind/cm2 and Pocillopora sp. is 229.63 ind / cm2. The diversity index analysis of crabs at 2 depths category is moderate, which means that the balance in the ecosystem is unstable, where there are some of species with low and high tolerance levels if there is a change in pressure from the environment.","PeriodicalId":30849,"journal":{"name":"Journal of Marine and Aquatic Sciences","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44074258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-12-23DOI: 10.24843/jmas.2020.v06.i02.p17
M. I. Khaldun, Yuli Naulita, A. F. Koropitan
Tropical cyclones are a phenomenon that occurs because of the interaction between oceans and atmospheric circulation. The southeastern Indian Ocean is one of the areas that has a high activity of tropical cyclones. Tropical cyclones that cross waters can result in mixing of water masses. The mixing process produces water mass entrainment between lower and upper layers which decreases temperature in the upper layer. The purpose of this study was to estimate the strength of turbulent mixing caused by tropical cyclones using Argo Float data. The result of this study shows the turbulent mixing caused by tropical cyclones was very strong in the surface layer. Turbulent mixing is not found before the cyclone and increases when the cyclone occurs. The increase in turbulent mixing was recorded at a depth of 50 m which had an energy dissipation value ranging from 6.86x10-8 - 1.93x10-4 W/Kg and a turbulent mixing value with a range of 1.0x10-3 - 2.51x10-1 m2 s-1. This study concluded that the turbulent mixing in the surface layer is caused by tropical cyclones which is the main factor triggering the increase in the dissipation of kinetic and turbulent energy at the sites.
{"title":"Percampuran Turbulen Di Tenggara Samudera Hindia Saat Siklon Tropis Marcus Menggunakan Data ARGO Float","authors":"M. I. Khaldun, Yuli Naulita, A. F. Koropitan","doi":"10.24843/jmas.2020.v06.i02.p17","DOIUrl":"https://doi.org/10.24843/jmas.2020.v06.i02.p17","url":null,"abstract":"Tropical cyclones are a phenomenon that occurs because of the interaction between oceans and atmospheric circulation. The southeastern Indian Ocean is one of the areas that has a high activity of tropical cyclones. Tropical cyclones that cross waters can result in mixing of water masses. The mixing process produces water mass entrainment between lower and upper layers which decreases temperature in the upper layer. The purpose of this study was to estimate the strength of turbulent mixing caused by tropical cyclones using Argo Float data. The result of this study shows the turbulent mixing caused by tropical cyclones was very strong in the surface layer. Turbulent mixing is not found before the cyclone and increases when the cyclone occurs. The increase in turbulent mixing was recorded at a depth of 50 m which had an energy dissipation value ranging from 6.86x10-8 - 1.93x10-4 W/Kg and a turbulent mixing value with a range of 1.0x10-3 - 2.51x10-1 m2 s-1. This study concluded that the turbulent mixing in the surface layer is caused by tropical cyclones which is the main factor triggering the increase in the dissipation of kinetic and turbulent energy at the sites.","PeriodicalId":30849,"journal":{"name":"Journal of Marine and Aquatic Sciences","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44832217","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-12-18DOI: 10.24843/jmas.2020.v06.i02.p16
I. Suryawan, P. Julyantoro, G. Kartika
Batur lake is an aquatic natural resource that has a very important value in terms of ecological functions and economic functions. Batur lake gets pressure due to discharges of various types of waste generated from plantation activities, community settlements, cultivated feed residues in floating net cages, tourism activities and water transportation waste. It can cause ecosystems disruption in Batur lake, especially on the aquatic vegetation. This study aims to determine the species diversity and the influence of community activities on aquatic vegetation in Batur lake. This research was conducted from February to March 2017 at Batur Lake using quantitative descriptive method. Sampling was conducted at five stations by taking data and samples of aquatic vegetation, measuring water quality (temperature, pH, DO, clarity and turbidity) and water samples for testing nitrate, phosphate and sulfide acid content. The aquatic vegetation species that found were seven types, namely Alternanthera philoxeroides, Persicria decipiens, Phragmites australis, Eicchornia crassipes, Ceratophyllum demersum, Pistia stratiotes and Azolla pinnata. The value of diversity is in the low category. Uniformity of aquatic vegetation in Lake Batur waters ranged from 0.62257 - 0.874. The dominant value ranges from 0.22435 - 0.61563. The highest density values were found in species of Alternanthera philoxeroides at station II with 880 ind/m2 and 40 ind/m2 of Persicaria decipiens as the lowest density species. The water quality parameters give a significant influence on the growth of aquatic vegetation in Batur lake waters.
{"title":"Keanekaragaman Vegetasi Akuatik di Peraian Danau Batur, Kintamani, Bangli","authors":"I. Suryawan, P. Julyantoro, G. Kartika","doi":"10.24843/jmas.2020.v06.i02.p16","DOIUrl":"https://doi.org/10.24843/jmas.2020.v06.i02.p16","url":null,"abstract":"Batur lake is an aquatic natural resource that has a very important value in terms of ecological functions and economic functions. Batur lake gets pressure due to discharges of various types of waste generated from plantation activities, community settlements, cultivated feed residues in floating net cages, tourism activities and water transportation waste. It can cause ecosystems disruption in Batur lake, especially on the aquatic vegetation. This study aims to determine the species diversity and the influence of community activities on aquatic vegetation in Batur lake. This research was conducted from February to March 2017 at Batur Lake using quantitative descriptive method. Sampling was conducted at five stations by taking data and samples of aquatic vegetation, measuring water quality (temperature, pH, DO, clarity and turbidity) and water samples for testing nitrate, phosphate and sulfide acid content. The aquatic vegetation species that found were seven types, namely Alternanthera philoxeroides, Persicria decipiens, Phragmites australis, Eicchornia crassipes, Ceratophyllum demersum, Pistia stratiotes and Azolla pinnata. The value of diversity is in the low category. Uniformity of aquatic vegetation in Lake Batur waters ranged from 0.62257 - 0.874. The dominant value ranges from 0.22435 - 0.61563. The highest density values were found in species of Alternanthera philoxeroides at station II with 880 ind/m2 and 40 ind/m2 of Persicaria decipiens as the lowest density species. The water quality parameters give a significant influence on the growth of aquatic vegetation in Batur lake waters.","PeriodicalId":30849,"journal":{"name":"Journal of Marine and Aquatic Sciences","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45165644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-12-16DOI: 10.24843/jmas.2020.v06.i02.p15
Dika Madyawan, I. G. Hendrawan, Y. Suteja
Dissolved oxygen by definition is the total milligrams of oxygen gas dissolved in water which is influenced by atmospheric pressure, temperature, salinity, water turbulence, photosynthesis, respiration and waste. The Finite Volume Coastal Ocean Model (FVCOM) method is one of the ways to study water quality model. This study is aimed to determine the spatial distribution of DO concentration in Benoa Bay during the rainy season on the water surface and the deeper waters. This study was conducted in the waters of the Benoa Bay and rivers which empties into Benoa Bay on January 29 to February 25 2018, representing the rainy season. In carrying out the simulation, two steps are carried out, firstly numerical modeling was done to get ocean current patterns in Benoa Bay, and secondly making a numerical model where DO concentration values are added to get the results of DO distribution horizontally and vertically. The value of DO results ranged from 4.3 to 8.4 mg/l on the surface water of Benoa Bay. Based on tidal results of model during its highest tide, high tide to low tide, and lowest tide conditions, DO concentrations on the surface are higher than the deeper water. However, during low tide to high tide conditions, DO concentrations on the surface water is higher than the deeper water. Conclusions obtained from this research shows that DO concentrations in Benoa Bay waters have a minimum value of 2 mg/l and a maximum of 8.4 mg/l., where conditions of the tidal elevation affects DO concentrations, where it tends to go higher near the land and on sea surface.
{"title":"Pemodelan Oksigen Terlarut (Dissolved Oxygen/DO) di Perairan Teluk Benoa","authors":"Dika Madyawan, I. G. Hendrawan, Y. Suteja","doi":"10.24843/jmas.2020.v06.i02.p15","DOIUrl":"https://doi.org/10.24843/jmas.2020.v06.i02.p15","url":null,"abstract":"Dissolved oxygen by definition is the total milligrams of oxygen gas dissolved in water which is influenced by atmospheric pressure, temperature, salinity, water turbulence, photosynthesis, respiration and waste. The Finite Volume Coastal Ocean Model (FVCOM) method is one of the ways to study water quality model. This study is aimed to determine the spatial distribution of DO concentration in Benoa Bay during the rainy season on the water surface and the deeper waters. This study was conducted in the waters of the Benoa Bay and rivers which empties into Benoa Bay on January 29 to February 25 2018, representing the rainy season. In carrying out the simulation, two steps are carried out, firstly numerical modeling was done to get ocean current patterns in Benoa Bay, and secondly making a numerical model where DO concentration values are added to get the results of DO distribution horizontally and vertically. The value of DO results ranged from 4.3 to 8.4 mg/l on the surface water of Benoa Bay. Based on tidal results of model during its highest tide, high tide to low tide, and lowest tide conditions, DO concentrations on the surface are higher than the deeper water. However, during low tide to high tide conditions, DO concentrations on the surface water is higher than the deeper water. Conclusions obtained from this research shows that DO concentrations in Benoa Bay waters have a minimum value of 2 mg/l and a maximum of 8.4 mg/l., where conditions of the tidal elevation affects DO concentrations, where it tends to go higher near the land and on sea surface.","PeriodicalId":30849,"journal":{"name":"Journal of Marine and Aquatic Sciences","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43977686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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