Yellowfin Tuna Research Articles

Relative abundance of yellowfin tuna Thunnus albacares (Bonnaterre, 1788) in the tropical area of the north-eastern Indian Ocean

The tropical area of the north-eastern Indian Ocean has historically been a prominent fishing ground for yellowfin tunaThunnus albacares (Bonnaterre, 1788). However, low effort from either Japanese or Taiwanese fleet in the last two decadeshas driven some uncertainties in relative abundance estimates of yellowfin tuna, which affects the robustness of the currentstock analysis for an already declined population. Hence this study was carried out to bridge the research gap by utilising theIndonesian scientific observer data from 2006-2021, which covers the north-eastern Indian Ocean. A delta-lognormal modelwas adopted to fit the data, with the catch per unit effort as the response variable and year, quarter, moon phase, latitudeand longitude as known covariates. The optimal model was chosen using a backward method based on Akaike InformationCriterion (AIC) (Akaike, 1974), Bayesian Information Criterion (BIC) (Schwarz, 1978) and the values of the coefficientof determination (R2). In general, the relative abundance of yellowfin tuna remained at a very low level, with an apparentdeclining trend in the first decade, followed by a slight sign of recovery in the past three years. However, the increasing trendwas overshadowed by uncertainties, likely caused due to natural variation and low coverage in some years. Although theseries was considered short, it managed to picture the dynamics of the abundance of yellowfin tuna in the tropical area of thenorth-eastern Indian Ocean, which is essential for conducting a more robust harvest strategy evaluation. Keywords: Declining stock, Fisheries-independent data, Highly migratory, Relative abundance, Scientific observer

Relationship Between Musculoskeletal Load and Weight of Manual Fish Handling Via 2D Simulation

Fisherman experienced work-related musculoskeletal disorders (WMSDs) due to manual handling. Especially, manual handling for heavy fish makes physical load for fisherman. To prevent these WMSDs, fisherman should know the limit of weight in manual fish handling. Thus, the objective of this study was to find the relationship between the musculoskeletal load and weight of manual fish handling. This investigation was performed by the 2D musculoskeletal simulation. Posture of fishermen during manual fish handling on the commercial fishing boat was obtained from the Fishnet Open Images Database. Compression force of L5-S1 and joint torque of elbow, shoulder, knee, and ankle as musculoskeletal load were calculated by BlessPro2 software. The weight values of bigeye tuna, yellowfin tuna, and albacore tuna were used for this simulation. The results showed that compression force of L5-S1 and joint torque were increased with fish weight. In addition, the compression forces of L5-S1 during manual handling for bigeye tuna and yellowfin tuna were much larger than 3400 N as injury threshold of the National Institute of Occupational Safety and Health (NIOSH). These results indicate that fishermen should avoid heavy fish such as bigeye tuna and yellowfin tuna in manual fish handling for preventing WMSDs.

Length-Weight Relationship and Condition Factor of Yellowfin Tuna (Thunnus albacares) from Demta Coast, Jayapura Regency, Papua

The population of Thunnus albacares yellowfin tuna from the Scombridae family is very abundant in North Papua Waters (WPP 717). This study aims to analyze the parameters of population dynamics based on the long-weight relationship and condition factors on Thunnus albacares in Demta Coastal Waters, Jayapura Regency. Fish data collection uses passive and active fishing methods using gill nets, handlines, and long line fishing through fishing activities by traditional fishermen during April - June 2022. Data analysis uses analysis length-weight relationship and condition factor. The results of this study found that the population structure of yellowfin tuna (T. albaceras) was very diverse in the waters of North Papua, with a negative allometric growth pattern (b < 3), i.e. the growth of body length was faster than weight. The condition factor averaged 1.1302 with a maximum of 1.4718 and a minimum of 0.7028. Where in the gonadal maturity period morphometric adaptation occurs, weight growth becomes faster and body length becomes slower.

Changes in Condition Factor, Hepatosomatic and Gonadosomatic Index of Yellowfin Tuna (Thunnus albacares) in Captivity

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.

Extraction and characterisation of type I collagen from the skin offcuts generated at the commercial fish processing centres.

Effective use of underutilised fish processing by-products could open avenues for new industries if they are used to extract high-valued bioactive compounds. Therefore, discarded skin offcuts of three main commercial fish species of Sri Lanka were used to extract collagen with acetic acid and the extracted collagen was evaluated for industrial suitability. The yields of acid-soluble collagens from Yellowfin tuna (Thunnus albacares), Seer fish (Scomberomorus commerson) and Asian sea bass (Lates calcarifer) were 61.26%, 58.21% and 59.31%, respectively on a dry-weight basis. Fourier Transform Infra-Red spectra and X-ray Diffraction spectra confirmed that all collagens were in type I and preserved the native triple-helical structure during extraction. The UV absorption spectra confirmed a high collagen purity in all species. These results confirm that the extracted collagen consists of the characteristics required for collagen-based industries such as food, pharmaceutical, and biomedical. The high availability of skin offcuts from the processing industry and the higher collagen yields revealed in this study confirm the possibility of using discarded skin offcuts of the three fish species as a potential source of type I collagen for industrial purposes.

Analysis of the yellowfin tuna marketing chain at PPP Pondok Dadap Sendang Biru, South Malang

The goal of this study was to investigate the yellowfin tuna marketing chain in PPP Pondok Dadap Sendang Biru. Additionally, this study determined the margin and price share earned by yellowfin tuna fishermen. This research employed a survey strategy that included direct observation and interviews. The data used were original sources collected during October and November 2021. The respondents were chosen using the snowball sampling technique, which is a technique for identifying informants or respondents who possess a wealth of information on the research being conducted. There were 37 respondents. According to the study's findings, there are three distinct channels for yellowfin tuna marketing at PPP Pondok Dadap Sendang Biru. In chain 2, retailers earned the largest overall margin of Rp. 8,864/Kg, or 29 percent. In channel 3, retailers earned the largest overall margin of Rp. 12,000/Kg, or 34%. The biggest Fisherman's share, at 62 percent, is in the type 2 marketing chain.Keywords: fisherman’s share; marketing chain; margin; tuna

Effects of Acute High-Temperature Stress on Physical Responses of Yellowfin Tuna (Thunnus albacares)

To understand the physiological reactions of juvenile yellowfin tuna (Thunnus albacares) under acute high-temperature stress, this study measured the changes in biochemical indexes of serum, liver, gill, and muscle of yellowfin tuna under acute high-temperature stress (HT, 34 °C) and a control group (28 °C) for 0 h and 6 h, 24 h and 48 h. The rising speed of water temperature in the HT group was 2 °C/h and the timing started when the temperature reached 34 °C. In the HT group, there was no significant difference between the four adjacent times in cortisol and lactic acid concentration. Serum triglyceride, cholesterol, and alkaline phosphatase concentration were significantly different from the four adjacent times. The superoxide dismutase (SOD) activity in the liver and gills increased at 6 h and 24 h, and the gills and liver had antioxidant reactions in a short time. The malondialdehyde (MDA) concentration in the gills changed significantly at 6 h, while that in the liver did not change significantly. The gills were more sensitive to temperature stress than the liver and muscle. Acute high-temperature stress affected yellowfin tuna’s antioxidant enzymes and metabolic indexes, resulting negative trend in physiological indexes, indicating that yellowfin tuna juveniles are susceptible to elevated temperature.

Evaluating otolith increment deposition rates in bigeye tuna (Thunnus obesus) and yellowfin tuna (T. albacares) tagged in the Atlantic Ocean

Evaluating otolith increment deposition rates in bigeye tuna (Thunnus obesus) and yellowfin tuna (T. albacares) tagged in the Atlantic Ocean

Analysis of the yellowfin tuna marketing chain at PPP Pondok Dadap Sendang Biru, South Malang

The goal of this study was to investigate the yellowfin tuna marketing chain in PPP Pondok Dadap Sendang Biru. Additionally, this study determined the margin and price share earned by yellowfin tuna fisherman. This research employed a survey strategy that included direct observation and interviews. The data used were original sources collected during October and November 2021. The respondents were chosen using the snowball sampling technique, which is a technique for identifying informants or respondents who possess a wealth of information on the research being conducted. There were 37 respondents. According to the study's findings, there are three distinct channels for yellowfin tuna marketing at PPP Pondok Dadap Sendang Biru. In chain 2, retailers earned the largest overall margin of Rp. 8,864/Kg, or 29 percent. In channel 3, retailers earned the largest overall margin of Rp. 12,000/Kg, or 34%. The biggest Fisherman's share, at 62 percent, is in the type 2 marketing chain.Keywords: fisherman’s share; marketing chain; margin; tuna

Effects of the COVID-19 Pandemic on the Tokyo Wholesale Tuna Market

The study investigated how the changes in the hours spent at home during the COVID-19 pandemic affected the Tokyo Toyosu bluefin, bigeye, and yellowfin tuna markets. Applying the nonlinear autoregressive distributed lag (NARDL) price models for the three tuna products during the four state of emergency (SOE) periods between 2020 and 2021 in Tokyo, the study reveals that an increase in the hours of stay-at-home during the first SOE had an adverse impact on all three tuna prices in the long run. The study also finds that for the bluefin tuna, an increase in the hours of stay at home had a positive impact on price in the short run when the hours of stay at home were increasing during the first SOE. This suggests that there were times when household demand for bluefin tuna increased while people spent longer in their homes during the SOE period.

Assessment of the physico-chemical and sensory properties of frozen fillets of tuna and tuna-related fish species marketed along the Tanga and Mtwara coastlines, Tanzania

ABSTRACT Tuna and tuna-related fish are valuable marine species lacking standardized quality assessment parameters. This study assessed the physico-chemical and sensory properties of skipjack (Katsuwonus pelamis), bigeye (Thunnus obesus), yellowfin (Thunnus albacares), and kawakawa (Euthynnus affinis) tuna fish fillets marketed in Tanga and Mtwara, Tanzania. Laboratory AOAC methods evaluated total volatile basic-nitrogen (TVB-N), pH, color (lightness L*), and texture (hardness) properties. The quality index method (QIM) assessed tuna fillets’ sensory properties (color, texture, and odor). The pH ranged between 5.60 ± 0.08 and 6.10 ± 0.30, the TVB-N between 34 ± 7.00 mg/100 g and 38.04 ± 10.50 mg/100 g, color lightness (L*) between 24.33 ± 1.82 and 40.10 ± 1.50, and texture (hardness) from 3.84 ± 1.20 N to 8.56 ± 1.84 N. The tuna fillets got an overall score of 2 in the sensory analysis, which indicated good quality according to the QIM. Furthermore, the present study showed significant differences (p < .05) between the tuna species in pH, hardness (instrumental), and color lightness properties (L*). There were no significant differences (p > .05) in average TVB-N results across all tuna fillets. There were significant correlations among the assessed quality properties. Based on the combined quality properties results and correlation analysis, the tuna and tuna-related fish marketed in the study areas were of good quality. This study recommends the establishment of standardized quality assessment parameters for tuna and related fish species.

Analysis Of Potential Zone Catching Of Yellow Fin Tuna (Thunnus Albacares) Based on Aqua Modis Images in Cilacap Waters

One area that has the potential for Yellowfin Tuna (Thunnus Albacares) is in the southern area of ​​Java, especially the Cilacap sea waters. To increase efficiency in the search for fishing areas, technology is needed that can determine potential fishing areas. One technique for determining fishing areas is by utilizing remote sensing technology using oceanographic parameter image data via the Aqua MODIS satellite. The oceanographic parameters used were chlorophyll-a and sea surface temperature (SST). The content of chlorophyll-a in the waters for yellowfin tuna (Thunnus Albacares) ranges from 0.15 mg/m3 – 0.17 mg/m3 . The sea surface temperature (SST) for Yellowfin Tuna (Thunnus Albacares) ranges from 26OC - 29OC. From the results of the analysis of mapping, the waters in the sea area of ​​​​Cilacap is a suitable habitats marked by the number of coordinates of the Potential Fishing Zone (ZPPI).

Effect of marine climate and baitfish availability on the tuna baitboat fishery CPUE OFF northwestern Mexico

Tunas caught by the baitboat fleet are one of the most sustainable products of the high seas. We analyzed catches of the baitboat fleet operating off northwestern Mexico from 1978 to 2013. We assessed the relationship between the standardized tuna catch and the Multivariate El Niño Index (MEI), the Pacific Decadal Oscillation (PDO), and landings of the two main species (Pacific sardine, Sardinops sagax, and northern anchovy, Engraulix mordax) used as baitfish in the Northeastern Pacific Ocean tuna fishery. Results showed a strong correlation between yellowfin tuna (Thunnus albacares) catches and sardine landings, and an inverse correlation between yellowfin tuna catches and both MEI and PDO. Yellowfin tunas are more abundant during colder-than-normal conditions. We hypothesized that, when the sardine population is more vulnerable to the small-pelagic fishery in the Gulf of California, environmentally ideal conditions, as well as baitfish (sardine) availability, resulted in high yellowfin tuna landings. The opposite behavior was observed for the standardized catch of skipjack tuna (Katsuwonus pelamis): a strong correlation with anchovy landings and a positive correlation with both MEI and PDO suggested that there is an alternation between tuna and small pelagic species.

UPAYA MENJAGA KESINAMBUNGAN PERIKANAN TUNA MADIDIHANG DI DESA TULEHU, KABUPATEN MALUKU TENGAH

Yellowfin tuna is the leading prima donna in the capture fisheries sector in Maluku Province with a total national contribution of the two foreign exchange earners. The increase in production volume has not been able to meet the increasing demand for regional and global markets. This has led to an increase in fishing intensity in almost all Indonesian waters. Especially in Maluku. The increasing intensity of fishing causes yellowfin tuna to experience fishing pressure which can result in a decrease in stock size, both individual size and population size. The method used is the delivery of theoretical material and interactive discussions to fishermen. The results of the counseling on efforts to maintain the sustainability of the yellowfin tuna fisheries show that the community understands the importance of the availability of catch data both in the number and size of fish caught. The community must also participate in efforts to limit the number of fish caught because it is a wise thing to provide opportunities for fish to reproduce. This counseling is a very relevant suggestion to the condition of the available yellowfin tuna fishery resources

PENANGKAPAN TUNA MADIDIHANG (THUNNUS ALBACARES) DENGAN PANCING ULUR OLEH NELAYAN KECAMATAN AMAHAI KABUPATEN MALUKU TENGAH

One of the fishery commodities with high economic value is tuna, where in the Maluku region in 2021, tuna production will be 35.56% (BPS, 2022). Tuna is caught using handlines which are classified as small-scale fisheries. The existence of tuna that changes over time causes fishermen to experience uncertainty in finding suitable fishing areas. Temperature is an important indicator in the distribution and abundance of tuna. This study aims to determine the composition of the hand line catch and to analyze the temperature distribution based on the area of ​​the hand line fishing operation in Central Maluku Regency. The research was conducted in the waters with the method used is a survey method by following fishing trips and using GPS satellite-based Spot Trace to track vessel movement activities during fishing operations. Descriptive data analysis was used to determine the composition of fisherman catches and used SeaWiFS Data Analysis System (SEADAS) 7.3.1 and Surfer 12 to analyze the distribution of water temperatures at fishing locations. The results showed that yellowfin tuna (Thunnus albacares) dominated the catch by 70.30%, bigeye tuna (Thunnus obesus) by 20.19% and skipjack tuna (Katsuwonus pelamis) by 0.52%. The frequency distribution of yellowfin tuna length ranges from 23-171 cmFL where during 2019 it was dominated by sizes &lt;100 cmFL as much as 82.42%. The SST range in January is 290C-310C, optimal fishing is at 29.80C-30.40C, April is in the range of 30.20C-31.70C, optimal fishing is at 30.90C-31.30C, in May is in the range of 27.40C-31,40C the optimal catch is in the temperature range of 27.80C -30.80C, in June is 27.40C -280C the optimal catch is in the temperature range 27.60C-27.850C, in September 27.40C-29.50C the optimal catch is at a temperature range of 27, 80C -28.50C, and in December the range of 29.40C-31.50C is optimal for catching at a temperature range of 30.40C -31.20C

Comparative proteomics analysis of three commercial tuna species through SWATH-MS based mass spectrometry and chemometrics

The adulteration of tuna is found as attenuation of morphological characteristics during processing due to the exhaustion of tuna resource. The authenticity of tuna is now concentrated in the seafood supply chain. Protein, as the most important component of tuna muscle, plays a very important role in tuna. In this study, the protein relative quantitation of 3 commercial tuna species (skipjack tuna, bigeye tuna and yellowfin tuna) were revealed through the developed sequential window acquisition of all theoretical fragment ion mass spectra (SWATH-MS)-based proteomic analysis with 81 proteins being reliably quantified. Further protein biomarkers discovery was carried out by chemometrics, leading to 14 proteins screened as potential biomarkers. Hierarchical clustering analysis showed that the screened protein biomarkers have the ability to distinguish the 3 tuna species. Gene ontology (GO) annotation of the screened protein biomarkers most of them were relevant to molecular functions.

Pirogues to Paradise?

Pirogues to Paradise?

Applying seasonal time series modeling to forecast marine fishery landings for six species in the Colombian Pacific Ocean

Marine fisheries are keystone components of the industrial and social development of countries. Management of marine resources requires forecasting skills to support best decisions for the sustainability of fishery resources and food security under different environmental, social and political scenarios. In this study, we aimed at forecasting the landings of six marine fish species in the Colombian Pacific Ocean (CPO) from 2020 to 2024, using monthly time series from 2012 to 2020 provided by SEPEC (Servicio Estadístico Pesquero Colombiano), the Colombian governmental authority in charge of aquaculture and fisheries. These forecasts consisted of building, fitting and evaluating SARIMA models (Seasonal Autoregressive Integrated Moving Average), since all of the time series were non-stationary. We focused on evaluating the average percent change of landings between the historical and the forecast periods exclusively on peak landing months. The main results suggested that the landings of the Yellowfin tuna (Thunnus albacores) will decrease by 14% until 2024, those of the Skipjack tuna (Katsunowus pelamis) by 20% until 2022, and those of the Spotted snapper (Lutjanus peru) by 28% until 2023. The forecast landings of the Cachema weakfish (Cynoscion phoxocephalus) and the Red snapper (Lutjanus peru) showed constant increases until 2024, by 1.5 and 0.85 tons per year on average respectively, and those of the Pink grouper (Hyporthodus acanthistius) showed no trends until 2024. These results are the first approach to a multi-species forecast of marine fishery landings in the Colombian Pacific Ocean using a SARIMA model, and their implications must be carefully interpreted for decision making towards the sustainability of fishery resources.

Synthesis of Carbon from Yellowfin Tuna Fishbone to Remove Iron (Fe) Metal in Well Water from Bandar Setia

The performance of tuna fishbone waste as carbon to remove iron (Fe) metal from well water was studied. The parameters of carbon synthesis were set by varying the carbonization temperature of 300, 400, and 500°C. Fishbone carbon was characterized using Scanning Electron Microscopy (SEM-EDX), X-ray Diffraction (XRD), and SSA (nitrogen adsorption). The BET and (BJH) analysis showed that the increase in carbon surface area and pore size was proportional to the increase in carbonization temperature. Fishbone carbon was used as a filtration medium to reduce high levels of iron metal in well water. Samples were taken from wells belonging to residents in Bandar Setia, Medan Tembung. Fishbone carbon was effective as an adsorbent for removing iron metal from well water by the filtration method. The rate of iron removal was 99% for fishbone carbon, carbonized at 400°C.

Utilizing Firefly Technology for Uterine Isthmocele Recognition and Excision: An Approach to Robotic Assisted Cesarean Scar Defect Repair

Study Objective Utilize Firefly fluorescent technology in a robotic assisted isthmocele repair for more accurate defect recognition and excision. Design In laparoscopic approaches for isthmocele repair steps include bladder retraction, defect recognition, excision, and approximation of myometrium. In Firefly, a special camera uses near-infrared imaging to detect blood flow and allow for trans-illumination of vasculature. Since hysteroscopic imaging has shown that isthmoceles contain areas of abnormal vasculature, we can utilize Firefly technology to highlight the defect. Setting Patient was prepared in dorsal lithotomy position with yellow fin stirrups. Patients or Participants We present a patient who desired a second embryo transfer after a cesarean section. She underwent 10 different lining preparations that were all cancelled due to fluid in the lining. MRI showed an endomyometrial defect compatible with isthmocele. Interventions After the bladder is retraced from the lower uterine segment, we switch the robot to Firefly mode and highlight the isthmocele region in bright green. We then mark the highlighted boundaries of the isthmocele with cautery. By marking the isthmocele borders prior to excision, we can avoid vascular and bladder injury. We then reapproximate the healthy myometrium in a multilayer closure. Firefly imaging is used again with prior bright green areas of abnormal uptake no longer visualized. We then use hysteroscopy to view the revision for continuity. Measurements and Main Results Patient will follow-up in three months to assess uterine cavity with ultrasound. Conclusion Firefly technology represents an innovative practical approach for robotic assisted isthmocele repair, utilizing the abnormal vasculature created by the isthmocele for improved defect border recognition and excision. While laparoscopic options have been shown to have better outcomes, they are more invasive than hysteroscopic approaches and can have higher incidence of bladder or vascular injury. By utilizing the Firefly fluorescence technology, we can help to ensure a more complete and accurate isthmocele resection and create a safer approach for patients. Utilize Firefly fluorescent technology in a robotic assisted isthmocele repair for more accurate defect recognition and excision. In laparoscopic approaches for isthmocele repair steps include bladder retraction, defect recognition, excision, and approximation of myometrium. In Firefly, a special camera uses near-infrared imaging to detect blood flow and allow for trans-illumination of vasculature. Since hysteroscopic imaging has shown that isthmoceles contain areas of abnormal vasculature, we can utilize Firefly technology to highlight the defect. Patient was prepared in dorsal lithotomy position with yellow fin stirrups. We present a patient who desired a second embryo transfer after a cesarean section. She underwent 10 different lining preparations that were all cancelled due to fluid in the lining. MRI showed an endomyometrial defect compatible with isthmocele. After the bladder is retraced from the lower uterine segment, we switch the robot to Firefly mode and highlight the isthmocele region in bright green. We then mark the highlighted boundaries of the isthmocele with cautery. By marking the isthmocele borders prior to excision, we can avoid vascular and bladder injury. We then reapproximate the healthy myometrium in a multilayer closure. Firefly imaging is used again with prior bright green areas of abnormal uptake no longer visualized. We then use hysteroscopy to view the revision for continuity. Patient will follow-up in three months to assess uterine cavity with ultrasound. Firefly technology represents an innovative practical approach for robotic assisted isthmocele repair, utilizing the abnormal vasculature created by the isthmocele for improved defect border recognition and excision. While laparoscopic options have been shown to have better outcomes, they are more invasive than hysteroscopic approaches and can have higher incidence of bladder or vascular injury. By utilizing the Firefly fluorescence technology, we can help to ensure a more complete and accurate isthmocele resection and create a safer approach for patients.