The Experts below are selected from a list of 285 Experts worldwide ranked by ideXlab platform
Mukti Zainuddin - One of the best experts on this subject based on the ideXlab platform.
-
Estimating potential fishing zones for Skipjack Tuna (Katsuwonus pelamis) Abundance in Southern Makassar Strait
IOP Conference Series: Earth and Environmental Science, 2020Co-Authors: Rachmat Hidayat, Mukti Zainuddin, Achmat Mallawa, Muzzneena Ahmad Mustapha, Safruddin, A Rani Sahni PutriAbstract:This study aims to estimate potential fishing zones by estimating the abundance of Skipjack fish in the Makassar Strait using satellite data and Geographic Information Systems (GIS) techniques. The data used consists of catch coordinates, Skipjack catches, oceanographic data from satellite imagery with high-resolution Spectra-Resolution Imaging Spectroradiometer (MODIS) Aqua data (sea surface temperature, chlorophyll-a), Etopo1 for depth, and Aviso for the current speed. The prediction of Skipjack Tuna abundance is calculated by the Generalized Additive Model (GAM) prediction function to determine the best parameters seen from the AIC and GCV value, then mapped using geographic information system techniques by using the multi-regression formula. The results showed that the most potential fishing ground for Skipjack Tuna in the Makassar Strait was in March 2018 with an estimated abundance of more than 477 fish km−2 at coordinates 118.1297 east longitude and -3.3814 southern latitude. We suggest that efforts to catch Skipjack Tuna are directed to this area for more profitable catches.
-
Mapping the Gravity Center of Fishing Ground on Skipjack Tuna Distribution in Bone Gulf-Flores Sea
International Journal of Environment Agriculture and Biotechnology, 2020Co-Authors: Sulyana Erma Desianty, Mukti Zainuddin, Safruddin SafruddinAbstract:Bone Gulf and Flores Sea in the Fisheries Management Area 713 (WPP 713) are known as one of the best Skipjack Tuna fishing areas in Indonesia, where Skipjack Tuna is an export commodity and has high economic value. The potential of Skipjack Tuna is based on the spatial-temporal pattern of oceanographic conditions. The distribution of Skipjack Tuna can be predicted by the biophysical conditions of the environment. Sea surface temperature and chlorophyll-a are biophysical parameters that greatly affect the distribution of Skipjack Tuna and are often used to predict potential fishing grounds. The study used Skipjack fisheries data from April to July in 2017 to 2019 and remote sensing satellite data on sea surface temperature and chlorophyll-a from Aqua / MODIS. This study aims to determine the gravity center of Skipjack Tuna fishing ground in Bone-Flores Sea using the Generalized Additive Model (GAM). The distribution of Skipjack Tuna was found to be significantly related (p
-
The Effect of Oceanographic Factors on Skipjack Tuna Fad Vs Free School Catch in the Bone Bay, Indonesia: an Important Step Toward Fishing Management
Jurnal Ilmu dan Teknologi Kelautan Tropis, 2019Co-Authors: Mukti Zainuddin, Safruddin, Muhammad Ridwan, Andi Rani Sahni Putri, Rachmat HidayatAbstract:The aims of this study were to compare Skipjack catch between FAD and free school fishing grounds and to describe the effect of the oceanographic factors on either Skipjack Tuna Fish Aggregating Device (FAD) or free school. We used a field survey method for collecting the Skipjack catch and the fishing positions for both near FAD and free school areas. Remotely sensed satellite data of sea surface temperature (SST) and chlorophyll-a concentration (Chl-a) were also used to extract the oceanographic data corresponding with both the fishing locations. To find out the vital oceanographic factors, we examined the characteristics of the oceanographic variables and Skipjack catch using t-test. Results indicated that the fishing operations of Skipjack Tuna at FAD tended to locate areas of relatively higher Chl-a than at free school locations. We also found that Skipjack Tuna catch was higher near the FAD than the other area, where the Chl-a was the most significant factor that affected the difference. This study suggests that the number of Skipjack Tuna FAD in the coastal waters of Bone Bay should be calculated accurately to ensure and support the Tuna fishing management in that study area.
-
Prediction of Potential Fishing Zones for Skipjack Tuna During the Northwest Monsoon Using Remotely Sensed Satellite Data
ILMU KELAUTAN: Indonesian Journal of Marine Sciences, 2017Co-Authors: Mukti Zainuddin, Safruddin Safruddin, Muhammad Banda Selamat, Aisjah Farhum, Sarip HidayatAbstract:One of economically important fish in the Bay of Bone is Skipjack Tuna which their distribution and migration are influenced by surrounding environment. This study aims to investigate the relationship between Skipjack Tuna and their environments, and to predict potential fishing zones (PFZs) for the fish in the Bone Bay-Flores Sea using satellite-based oceanography and catch data. Generalized additive models (GAMs) were used to assess the relationship. A generalized linear model(GLM) constructed from GAMs was used for prediction. Monthly mean sea surface temperature (SST) and chlorophyll-a during the northwest monsoon (December-January) together with catch data were used for the year 2012-2013. We used the GAMs to assess the effect of the environment variables on Skipjack Tuna CPUE (catch per unit effort). The best GLM was selected to predict Skipjack Tuna abundance. Results indicated that the highest CPUEs (fish/trip) occurred in areas where SST and chlorophyll-a ranged from 29.5°-31.5°C and 0.15 - 0.25 mg m -3 , respectively. The PFZs for Skipjack were closely related to the spatial distribution of the optimum oceanographic conditions and these mainly developed in three locations, northern area of Bone Bay in December, in the middle area of the bay (4°-5.5°S and 120.5°-121.5°E) during January and moved to the Flores Sea in February. The movement of Skipjack concentration was consistent with the fishery data. This suggests that the dynamics of the optimum oceanographic signatures provided a good indicator for predicting feeding grounds as hotspot areas for Skipjack Tuna in Bone Bay-Flores Sea during northwest monsoon. Keywords : Skipjack Tuna, potential fishing zones, satellite based-oceanographic data, Northwest monsoon
-
Biological Performance Aspect of Skipjack Tuna (Katsuw onus pelamis) Population Captured by Purse Seine in East Season at Flores Sea
2014Co-Authors: Achmar Mallawa, Faisal Amir, Mukti ZainuddinAbstract:Biological performance of Skipjack Tuna has been done in the Flores Sea during the southeast monsoon (June - August, 2013). The objective of the research was to analyze biological performance of Skipjack Tuna captured by purse seine: including size composition, age classes, growth rate, food habit, gonad maturity and suitable length for capture. The data for length structure and age class, the growth rate, food habit, gonad maturity, and volumetric fecundity estimation were analyzed using Bhattacharya, Von Bertalanffy, propendance index, histological and volumentric methods, respectively. The results showed that (1) the size structure and age class were different according to the fishing ground location and the fishing season, (2) the average size of fishes captured in the western part of Flores Sea was greater than the eastern one, (3) the average length of fishes catched by purse seine without fish aggregation device (FAD, rumpon) was longer than that of with FAD, (4) the growth rate of Skipjack Tuna was slow where the growth coefficient was less than 0,5 per year, and the asymptotic length was 106,0 cm FL, (5) the Skipjack Tuna achieved the mature stage at 45 cm and at 50 cm length for female and male, respectively, and ready to spawn at 55 cm and 60 cm for male and female , respectively, (6) it was more than 80 % of fishes captured by fishermen in the Flores Sea which were not yet suitable size for fishing.
Soottawat Benjakul - One of the best experts on this subject based on the ideXlab platform.
-
characteristics of biocalcium from pre cooked Skipjack Tuna bone as affected by different treatments
Waste and Biomass Valorization, 2018Co-Authors: Soottawat Benjakul, Sulaiman Madali, Theeraphol Senphan, Pornsatit SookchooAbstract:Biocalcium (Bio-Ca) from pre-cooked Skipjack Tuna bone was prepared using several treatments. Cleaning by high pressure water jet cleaner (CB), followed by alkaline treatment (AlB) could remove remaining meat and lipids, thereby increasing levels of Ca and P. This was confirmed by scanning electron microscopy with energy dispersive X-ray spectroscopy, in which Ca and P contents on bone surfaces were more increased (p < 0.05). Defatting using hexane was able to reduce thiobarbituric acid reactive substances values and fishy odor intensity. Bleaching using sodium hypochlorite and hydrogen peroxide resulted in the increase in whiteness (L*-value) with decreases in redness (a*-value) and yellowness (b*-value). Fishy odor intensity of Bio-Ca markedly decreased with the coincidental decreases in volatile aldehydes, ketones and alcohols. Bio-Ca still contained collagen with imino acid content of 179 residues/1000 residues. Thus, individual treatment profoundly affected properties and fishy odor of Bio-Ca from pre-cooked Skipjack Tuna bone.
-
Utilization of Tuna Processing Byproducts: Protein Hydrolysate from Skipjack Tuna (Katsuwonus pelamis) Viscera
Journal of Food Processing and Preservation, 2016Co-Authors: Suppasith Klomklao, Soottawat BenjakulAbstract:Alcalase showed optimum activity against Skipjack Tuna (Katsuwonus pelamis) viscera at pH 10 and 65C. Enzyme concentration, reaction time and fish viscera/buffer ratio affected the degree of hydrolysis (DH) (P
-
utilization of Tuna processing byproducts protein hydrolysate from Skipjack Tuna katsuwonus pelamis viscera
Journal of Food Processing and Preservation, 2016Co-Authors: Sappasith Klomklao, Soottawat BenjakulAbstract:Alcalase showed optimum activity against Skipjack Tuna (Katsuwonus pelamis) viscera at pH 10 and 65C. Enzyme concentration, reaction time and fish viscera/buffer ratio affected the degree of hydrolysis (DH) (P < 0.05). Hydrolysis with an enzyme level of 3% (w/w) for 20 min with fish viscera/buffer ratio of 1:2 (w/v) was found to be the optimum condition. Protein, lipid and ash content of freeze-dried hydrolysate were 81.04, 6.78 and 12.01% dry weight basis, respectively. It was brownish yellow in color (L* = 62.46, a* = 1.44 and b* = 23.05). The hydrolysate contained a high amount of essential amino acids (43.13%) and had glutamic acid, methionine and aspartic acid as the dominant amino acids. Therefore, protein hydrolysate derived from Skipjack Tuna viscera could potentially serve as a good source of peptides and amino acids and the production of Tuna waste protein hydrolysate has both ecological and economical advantage for the Tuna industry. Practical Applications Efficient utilization of fish byproducts, especially viscera, is important for the economic viability of the aquatic food industry. Enzymatic hydrolysis is one of the most effective technologies for recovering value-added proteins from fish viscera without losing their nutritional value. In this study, protein hydrolysate prepared from Skipjack Tuna viscera using Alcalase showed high protein content. Hence, it can be used in a wide range of food additives, diet nutrients and pharmaceutical agents.
-
Proteolytic degradation of sardine (Sardinella gibbosa) proteins by trypsin from Skipjack Tuna (Katsuwonus pelamis) spleen
Food Chemistry, 2006Co-Authors: Sappasith Klomklao, Soottawat Benjakul, Wonnop Visessanguan, Hideki Kishimura, Benjamin K. SimpsonAbstract:Trypsin from the spleen of Skipjack Tuna (Katsuwonus pelamis) was purified by ammonium sulfate precipitation and a series of chromatographies, including Sephacryl S-100 and benzamidine-Sepharose 4 fast flow (high sub). The enzyme was purified 22.3-fold with a yield of 51.6%. The molecular weight of trypsin was estimated to be 42 kDa by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. Purified trypsin was able to hydrolyse natural actomyosin (NAM) and myosin, but scarcely hydrolysed collagen. Myosin heavy chain was most susceptible to hydrolysis by trypsin as evidenced by the lowest band intensity remaining. The effect of NaCl on proteolytic activity was also studied. The band intensity of myosin heavy chain slightly increased as the NaCl concentration was increased, suggesting the inhibitory activity of NaCl. When hydrolytic activities of Skipjack Tuna spleen and bovine pancreas trypsins on sardine proteins, including NAM, myosin and collagen, were compared, it was found that trypsin from bovine pancreas showed a greater activity towards NAM and myosin than that from Skipjack Tuna spleen. However, neither enzymes could degrade collagen.
E. J. Thelen - One of the best experts on this subject based on the ideXlab platform.
-
Consequences of the historical demography on the global population structure of two highly migratory cosmopolitan marine fishes: the yellowfin Tuna (Thunnus albacares) and the Skipjack Tuna (Katsuwonus pelamis)
BMC evolutionary biology, 2005Co-Authors: Bert Ely, Jordi Viñas, Jaime R. Alvarado Bremer, Donna Black, L. Lucas, Kelly Covello, Alexis V Labrie, E. J. ThelenAbstract:Yellowfin and Skipjack Tuna are globally distributed in the world's tropical and sub-tropical oceans. Since little, if any, migration of these fishes occurs between the Atlantic and Indo-Pacific Oceans, one might expect to see genetic differences between sub-populations in these ocean basins. However, yellowfin and Skipjack Tuna have extremely large population sizes. Thus, the rate of genetic drift should be slower than that observed for other Tunas. Low levels of genetic differentiation were observed between Atlantic and Pacific samples of yellowfin Tuna. In contrast, no genetic differentiation was observed between Atlantic and Pacific samples of Skipjack Tuna. Much lower levels of genetic differentiation were found among sub-populations of yellowfin Tuna compared to those observed for other large Tunas, probably due to the large population size of yellowfin Tuna. Since Skipjack Tuna appear to have even larger population sizes, it is not surprising that no genetic differentiation was detected between Atlantic and Pacific samples of these fish.
Sappasith Klomklao - One of the best experts on this subject based on the ideXlab platform.
-
utilization of Tuna processing byproducts protein hydrolysate from Skipjack Tuna katsuwonus pelamis viscera
Journal of Food Processing and Preservation, 2016Co-Authors: Sappasith Klomklao, Soottawat BenjakulAbstract:Alcalase showed optimum activity against Skipjack Tuna (Katsuwonus pelamis) viscera at pH 10 and 65C. Enzyme concentration, reaction time and fish viscera/buffer ratio affected the degree of hydrolysis (DH) (P < 0.05). Hydrolysis with an enzyme level of 3% (w/w) for 20 min with fish viscera/buffer ratio of 1:2 (w/v) was found to be the optimum condition. Protein, lipid and ash content of freeze-dried hydrolysate were 81.04, 6.78 and 12.01% dry weight basis, respectively. It was brownish yellow in color (L* = 62.46, a* = 1.44 and b* = 23.05). The hydrolysate contained a high amount of essential amino acids (43.13%) and had glutamic acid, methionine and aspartic acid as the dominant amino acids. Therefore, protein hydrolysate derived from Skipjack Tuna viscera could potentially serve as a good source of peptides and amino acids and the production of Tuna waste protein hydrolysate has both ecological and economical advantage for the Tuna industry. Practical Applications Efficient utilization of fish byproducts, especially viscera, is important for the economic viability of the aquatic food industry. Enzymatic hydrolysis is one of the most effective technologies for recovering value-added proteins from fish viscera without losing their nutritional value. In this study, protein hydrolysate prepared from Skipjack Tuna viscera using Alcalase showed high protein content. Hence, it can be used in a wide range of food additives, diet nutrients and pharmaceutical agents.
-
Proteolytic degradation of sardine (Sardinella gibbosa) proteins by trypsin from Skipjack Tuna (Katsuwonus pelamis) spleen
Food Chemistry, 2006Co-Authors: Sappasith Klomklao, Soottawat Benjakul, Wonnop Visessanguan, Hideki Kishimura, Benjamin K. SimpsonAbstract:Trypsin from the spleen of Skipjack Tuna (Katsuwonus pelamis) was purified by ammonium sulfate precipitation and a series of chromatographies, including Sephacryl S-100 and benzamidine-Sepharose 4 fast flow (high sub). The enzyme was purified 22.3-fold with a yield of 51.6%. The molecular weight of trypsin was estimated to be 42 kDa by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. Purified trypsin was able to hydrolyse natural actomyosin (NAM) and myosin, but scarcely hydrolysed collagen. Myosin heavy chain was most susceptible to hydrolysis by trypsin as evidenced by the lowest band intensity remaining. The effect of NaCl on proteolytic activity was also studied. The band intensity of myosin heavy chain slightly increased as the NaCl concentration was increased, suggesting the inhibitory activity of NaCl. When hydrolytic activities of Skipjack Tuna spleen and bovine pancreas trypsins on sardine proteins, including NAM, myosin and collagen, were compared, it was found that trypsin from bovine pancreas showed a greater activity towards NAM and myosin than that from Skipjack Tuna spleen. However, neither enzymes could degrade collagen.
Young-ho Kim - One of the best experts on this subject based on the ideXlab platform.
-
Potential predictability of Skipjack Tuna (Katsuwonus pelamis) catches in the Western Central Pacific.
Scientific reports, 2020Co-Authors: Jihwan Kim, Young-gyu Park, Young-ho KimAbstract:The Pacific Island countries have a substantial socio-economic dependency on fisheries. Skipjack Tuna is one of the most important species in the Western Central Pacific (WCP) and its catches in this region exhibit a spatio-temporal variability influenced by ocean conditions, mainly the El Nino-Southern Oscillation (ENSO). This study investigates the relationship between Skipjack Tuna catch amounts and environmental variables in the equatorial Pacific during 1990-2014, and evaluates the potential predictability of the catches based on their statistical relationship. A series of regressed and reconstructed spatial patterns of upper-ocean temperature, salinity, currents and precipitation represent ENSO-like variability, and their principal component time series are used to estimate the predictability of Skipjack Tuna catches in the Federated States of Micronesia (FSM). ENSO-like variability depicted from 100 m temperature and 5 m salinity in the equatorial Pacific exhibit a significant predictability for the annual catch amount in the FSM for several years with a training period of > 20 years. This suggests that the subsurface temperature or near surface salinity can be a better predictor of ecosystem variability than widely used sea surface temperature. Applications of this result to other species could have broad implications for the fishery industry in the WCP.