Consumption Of Tuna Research Articles

Exposure assessment and semi-quantitative risk analysis of histamine in tuna and tuna-like fish from Indonesia

This study aimed to investigate histamine exposure associated with consumption of fresh tuna and tuna-like species in West Java, and to estimate risk of Scombroid Fish Poisoning (SFP) in Indonesia. A range of species, including tuna (Thunnus spp.), bullet tuna ( Auxis sp.), and skipjack ( Katsuwonus pelamis ) were collected from local markets and fish landing sites. Subsequently, histamine concentrations were determined using NMR analysis and exposure was calculated in mg/day for toddlers, children, and adults. The results showed that skipjack had the highest histamine exposure for all age groups, followed by bullet and regular tuna. The highest EDI for histamine was from skipjack consumption, accounting for 38.67; 37.77 and 20.74 percentage of exposure for toddlers, children and adults, respectively. These values are below the defined thresholds levels (ARfD), indicating no potential risk of acute health effect. Cooked bullet tuna and skipjack were estimated to cause similar illnesses, accounting for 6–7 cases per 100,000 individuals, which was higher than cooked tuna at 1–2 cases per 100,000 individuals. Considering the preparation of raw tuna in restaurants following Good Hygienic Practices (GHP), the predicted annual cases decreased significantly to 4–5 cases per million individuals. This risk estimation only considered histamine levels in fresh fish, without including data from fish preparation. Therefore, further studies were recommended to estimate the risk level in raw/fresh tuna and similar species before consumption.

Histamine poisoning after tuna consumption

Histamine poisoning after tuna consumption

Analysis of animal-based food consumption of farmer households in Girisubo Sub-district, Gunungkidul Regency

Abstract Food is one the basic necesssities that people must meet. One of the important needs for health is a source of protein. Sources of protein that are often consumed are fish, meat, eggs, and milk. The aim of this study was to identify the reasons that impact the amount of animal-based food consumed by households who engage in farming activities Girisubo Sub-district, Gunungkidul Regency. This study belongs to descriptive research. The research location was determined using the purposive method. The data samples include 100 respondents. The data were analyzed using multiple linear regression. The results showed that the average consumption of animal-based food of farmer households in Girisubo Sub-district, Gunungkidul Regency, was 1.31 kg/month of broiler chicken meat, 1.40 kg/month of broiler chicken eggs, and 1.54 kg/month of tuna. The education level and broiler chicken egg price have a positive effect on the consumption of broiler chicken meat, while cooking oil has a negative effect. The consumption of broiler chicken eggs is influenced by income and cooking oil price. Meanwhile, the factors affecting tuna consumption are income, egg price, tuna price, and cooking oil price. Income elasticity shows that broiler chicken eggs and tuna are categorized as normal goods. The price elasticity explains that tuna consumption is elastic. The cross-price elasticity indicates that broiler chicken eggs are substitute goods for broiler chicken meat and tuna while cooking oil is a complementary goods for broiler chicken meat, broiler chicken eggs, and tuna.

Health benefits of bluefin tuna consumption: (Thunnus thynnus) as a case study.

Consumers are increasingly interested in food products with high nutritional value and health benefits. For instance, fish consumption is linked with diverse positive health benefits and the prevention of certain widespread disorders, such as obesity, metabolic syndrome, or cardiovascular diseases. These benefits have been attributed to its excellent nutritional value (large amounts of high-quality fatty acids, proteins, vitamins, and minerals) and bioactive compounds, while being relatively low-caloric. Atlantic bluefin tuna (Thunnus tynnus) is one of the most consumed species worldwide, motivated by its good nutritional and organoleptic characteristics. Recently, some organizations have proposed limitations on its consumption due to the presence of contaminants, mainly heavy metals such as mercury. However, several studies have reported that most specimens hold lower levels of contaminants than the established limits and that their richness in selenium effectively limits the contaminants' bioaccessibility in the human body. Considering this situation, this study aims to provide baseline data about the nutritional composition and the latest evidence regarding the beneficial effects of Atlantic bluefin tuna consumption. A review of the risk-benefit ratio was also conducted to evaluate the safety of its consumption, considering the current suggested limitations to this species' consumption.

The presence of toxic heavy metals in tuna fishes from Laccadive sea and concomitant health risk.

Concentrations of heavy metals in Yellowfin and Skipjack tuna fishes from the Laccadive sea were determined by inductively coupled plasma optical emission spectroscopy (ICP-OES) to evaluate the human health hazards via their consumption. The samples were collected from different atolls of Maldives to ensure a good representation of sample distribution. The metal concentration in tuna fish is found to be below the maximum tolerable limit set by different international organisations. The target hazard quotient values for individual metals were well below the limiting value of 1, indicating an insignificant health risk via the dietary intake of fish. The maximum targeted cancer risk value was 10 -4, indicating low carcinogenic risk from the consumption of tuna fish from the Maldives. Hence, the consumption of tuna from the Laccadive Sea is safe for human health.

Risk assessment of trace metals in canned fish commercialized for human consumption in Egypt

Fourteen trace elements were examined using ICP-OES in the imported canned tuna fish, sardines, and tuna packaging medium that were sold in Greater Cairo. The leaching into acetic acid (3%) was done to simulate the releasing of trace metals from cans. The association between the trace metal levels in tuna, oil/brine, and the leaching of trace metals into 3% acetic acid solution was investigated. All trace metals were found in all samples, although Cd was not. Eight of 25 canned tuna (32%), and one of 5 canned Sardina pilchardus fish (20%) have Pb concentrations that exceeded the permissible limit (PL), whereas one albacore tuna (1/25; 4%) exceeded Finland's PL for As. Except for aluminum, which had higher concentration in oil/brine than in brine alone, there were no variations in other metal concentrations. Although, there is no considerable release of most metals into acetic acid, Fe and Al did, with a leaching median of 32 and 0.16 mg/L, respectively. The average daily intake of arsenic (0.850 mg) was greater than tolerable daily intake (TDI) for adults advised by WHO. The provisional tolerable weekly intake (PTWI) for As (0.085 mg/kg bw/week) also surpassed the advised PTWI. Only 3 out of 30 samples (10%) had PTWIs for Pb above them. The computed non-carcinogenic hazard index (HI) indicating that canned tuna consumption may have health risk for human. The most significant factor in all samples' higher target hazard quotient (THQ) levels was arsenic. This study comprises popular tuna fish species from Thailand, Vietnam, Italy, and Morocco, including skipjack, longtail, albacore, and sardina fish. Thus, it is pertinent to all nations that import tuna from these nations.

Eco-Labeled Canned Tuna Consumption: What do Italians Know and How do They Behave?

The study investigates the importance that Italians assign to eco-labeled canned tuna, their appreciation and ability to recognize different eco-label logos. Three steps of analysis were followed: a descriptive analysis; a test analysis, to detect the significance of socio-demographic characteristics, frequency of consumption and knowledge of eco-labels; finally, an ordered logistic model, to investigate respondents’ preferences toward eco-labeled tuna and understand what factors influence their choice. Results show a high willingness to buy and to pay for eco-labeled tuna. Most of the respondents were unable to identify the logos. Consumers who know the meaning of the sustainability concept, who buy certified products and who trust in the certification of products are more likely to prefer eco-labeled tuna, than other people. People’s recognition of eco-labels, awareness to buy certified food and the perceived knowledge of the overfishing status of tuna, all exerted a positive effect on people’s preferences toward eco-labeled tuna.

Raw fish consumption in Portugal: Commonly consumed fish species and associated risk factors for anisakiosis

Foodborne parasitic zoonoses from fish and shellfish products are of significant health concern. Anisakiosis is an important fish-borne zoonosis caused by nematodes of the genus Anisakis. Humans are infected through consumption of raw or undercooked fish or cephalopods containing Anisakis spp. Third stage larvae. Infection can result in both gastrointestinal and allergic symptoms. Globalization has resulted in a growth in demand for raw or undercooked food, and this may increase the population at risk of anisakiosis. Our study's main aim was to investigate the risk of anisakiosis from the five fish species most frequently consumed raw or undercooked in Portugal, as identified by a previous study. In addition, a study was carried out to identify the fish species most commonly used in raw fish dishes in Asian restaurants serving Japanese food in the Porto district. The results of this study were incorporated into the risk investigation. The 5 fish species most commonly eaten raw were salmon, tuna, cod, hake and sardines. This was similar to our findings in the restaurant survey, which identified salmon and tuna as the most popular fish served in raw dishes. It also identified nigiri, sashimi and temaki as the most popular raw fish dishes. After examination of the production practices and parasite prevalence for each of the five fish species, we concluded that the main risk groups for anisakiosis were consumers who prepare raw or lightly processed fish dishes at home, if they are unaware of methods to prevent anisakiosis. Some cooked fish dishes may also present a risk, lightly grilled wild salmon or sardines have the potential to contain viable Anisakis larvae. We identified a need for further studies, to establish the level of consumption of wild salmon and wild tuna, and a large-scale study to examine the level of sensitization to Anisakis within the Portuguese population. Our findings highlight the need for more consumer education campaigns regarding the risks associated with raw fish consumption, and prevention methods for anisakiosis. In addition, our study emphasises the need for a more standardized approach to inspection measures within the fish supply chain, to prevent products contaminated with parasites reaching the market.

Association of omega-3 and omega-6 fatty acid intake with leukocyte telomere length in US males

Omega-3 (n-3) and omega-6 (n-6) fatty acids may contribute to oxidative stress and inflammation, which are related to telomere shortening. Evidence supporting an association between intake of n-3 or n-6 fatty acids and leukocyte telomere length (LTL) in males has been limited. We conducted a cross-sectional study to examine the associations of total or individual n-3 or total n-6 fatty acid intake with LTL in US males. We included 2,494 US males with LTL measurement from 4 nested case-control studies within the Health Professionals Follow-Up Study. Individuals with previous histories of cancers, diabetes, and cardiovascular diseases at or before blood collection were excluded. Blood collection was performed between 1993 and 1995, and relevant information including n-3 and n-6 intake was collected in 1994 by questionnaire. The LTL was log-transformed and Z scores of the LTL were calculated for statistical analyses by standardizing the LTL in comparison with the mean within each selected nested case-control study. We found that consumption of DHA (22:6n-3) was positively associated with LTL. In the multivariable-adjusted model, compared with individuals who had the lowest intake of DHA (i.e., first quartile group), the percentage differences (95% CIs) of LTL were -3.7 (-13.7, 7.5), 7.0 (-4.3, 19.7), and 8.2 (-3.5, 21.3) for individuals in the second, third, and fourth quartiles of consumption, respectively (P-trend=0.0498). We did not find significant associations between total n-3 or total n-6 fatty acid intakes and LTL. In addition, we found that males who consumed canned tuna had longer LTL than those who did not; in the multivariable-adjusted model, the percentage difference of LTL was 10.5 (95% CI: 1.3, 20.4) (P=0.02). Our results suggest that higher intakes of DHA and canned tuna consumption are associated with longer LTL.

First isolation of a trh positive V. alginolyticus from Atlantic bluefin tuna (Thunnus thynnus) farmed in Turkey

Popularity of sushi-sashimi (raw-almost raw fish service) is increasing around the globe, and Atlantic bluefin tuna is among the most frequently used fish in these dishes. In this study, trh (Thermostable direct hemolysin-related hemolysin gene) positive Vibrio alginolyticus was isolated from the internal organs of two tuna sent to the laboratory from a farm in Aegean region of Turkey in 2014. Isolation was done by conventional microbiological methods and Vitek 2 Compact fully automatic identification device was used for identification. Isolate confirmation and investigation of trh-tdh (Thermostable direct hemolysin) gene existence were carried out by a Polymerase Chain Reaction (PCR) method. Two V.alginolyticus isolates from two tuna were found to be trh positive and tdh negative. trh is one of the important genes associated with pathogenicity in the Vibrio genus, and raw consumption of tuna infected with trh positive V.alginolyticus can cause serious food poisoning. The aim of this study is to report first isolation of trh positive Vibrio alginolyticus from two bluefin tuna cultured in the Aegean sea, to draw attention to possible dangers in raw-almost raw fish consumption and supply information for further epidemiological studies. However, more samples are necesary for mentioning the prevalence of high virulence food pathogens in tuna. However, due to their economic value, multiple tuna samples are rarely sent to laboratories for diagnostic purposes.

Are Italian consumers of canned tuna fish sensitive to environmentally sustainable product attributes?

PurposeThe study aims to provide important insights into environmental attributes that are relevant to consumer's choices in purchasing canned tuna fish, and how much these attributes and socio-demographic individual characteristics relate to the frequency of consumption.Design/methodology/approachAn online survey of 251 Italians was carried out. Socio-demographic variables and environmental attributes of the product that consumers pay attention to were considered in a two-step analysis: a cluster analysis used to create a segmentation of people's profiles that are further characterised; a binary logistic regression to assess the significance of attributes in relation to the frequency of canned tuna consumption.FindingsAmong attributes that respondents pay attention to when purchasing canned tuna, the country of origin is the aspect most considered, while other characteristics with a higher content of environmental sustainability received minimal attention. Three clusters emerged: the smallest one, insensitive to sustainability issues; an intermediate group which is mindful of sustainability attributes; and the biggest cluster which is “sustainability inconsistent.” Moreover, respondents who reported concerns about the environmental impacts of tuna production are less likely to consume the product than other consumers; attention paid to the method of farming, the presence of children and a young age show willingness to consume tuna.Originality/valueThis study contributes to the literature on canned tuna consumption by focusing on the attention that consumers pay to environmental product attributes in their purchasing choices. The relevance of this topic might be envisaged in relation to several environmental issues associated with tuna production and consumption, and to the economics and strategies of the tuna industry, being canned tuna among the most internationally traded seafood products.

A challenge to estimate global canned tuna demand and its impact on future tuna resource management using the gamma model

The overall demand for canned tuna products has increased remarkably over the last four decades because it is a good nutritional source of protein with competitive prices and health benefits. This study focused on the top thirty countries that account for 99% of global consumption in recent years to estimate the global canned tuna demand by 2050, using a density function of gamma distribution (gamma model). We found five markets including the Asia, Central and South America, Africa, Oceania and Middle East were growing, although the other two markets including the EU and North America are maturing or matured. Additionally, we discovered a significant quadratic correlation between the average per capita GDP and canned tuna consumption per capita when looking at the world as a whole. We estimated the global canned tuna demand will continue to increase further over the next several decades, and will reach 2,466,000 t in 2050, about 34% increase compared to the current level. Yet global tropical tuna resources are improbable to accommodate the future canned tuna demand, as the canned tuna dominants (62%) in the global tropical tuna catch in recent years. In conclusion, challenges estimating the long-term canned tuna demand would contribute to the sustainable use of tuna resources, including the improvement of the current fishing management in the socioeconomic aspects of the harvest control rules for tuna Purse Seine fisheries which dominate raw material supplies for canned tuna production.

An investigation protocol to manage a foodborne outbreak in a disaster event

Abstract Background During disaster events, the displaced populations living in tent camps are at high risk from foodborne illness outbreaks (FBO) as in these circumstances it is difficult to follow proper hygienic procedures during food handling and storage. When an outbreak occurs, an epidemiological investigation able to identify the source(s) of the exposure is essential to rapidly establish control measures to prevent continuing episodes of illness. This work aimed to evaluate the effectiveness and the applicability under simulated field conditions of an investigation protocol to be used during a FBO. Moreover, the application of the software ‘TOSSINFO' for data analysis was evaluated. Methods In May 2018, a FBO associated with the consumption of a tuna affecting 46 out of 75 people present in a tent camp in southern Italy was simulated. During the simulation, two teams of doctors and veterinarians participated in the investigation. The investigation protocol involved three steps: environmental inspection, epidemiological investigation, and data analysis through TOSSINFO. This software allows calculating different epidemiological indicators, several measures of association, and the visualization of the progression of the outbreak through epidemic curves. Results At the end of the exercise, both teams were able to trace the source of the infection. After data collection and data analysis, the groups demonstrated a strong association between illness people and tuna consumption. Furthermore, the teams achieved similar Results RR (7.50 vs 7.01), OR (27 vs 28), and Chi-square (12.1 vs 10.1). Conclusions The results demonstrated the validity of the procedure and the simple execution of the software analysis. These guidelines represent an opportunity for the implementation of foodborne disease management strategies and could be used throughout the community, leading to an improvement of the Public Health surveillance system. Key messages These guidelines allow for effective management of a food toxinfection episode. The original software TOSSINFO used in this procedure enables quick and easy identification of infected food.

Epidemiology of wheeze among preschool children: a population-based cross-sectional study from rural Sri Lanka

ObjectivesTo assess the prevalence of wheeze and factors associated with its severity among 3–6 years old children.MethodologyDesignA population-based, cross-sectional study using the WHO 30 cluster methodology with probability proportionate to...

Demand Elasticities of Canned Tuna at Point of Sale of a Large Retail Chain in Southern Philippines: Implications for Sustainability Policy

New variants of canned skipjack tuna have been developed by large manufacturers of canned tuna in the Philippines. This study analyzes the expenditure and price elasticities of canned tuna and determines the implications for sustainable fishery. An AIDS (almost ideal demand system) model incorporating an income group variable was used to estimate these elasticities. This study utilized a pooled time series data of 459 weekly point-of-sale observations from 2010–2012 of three store branches of a large supermarket chain in southern Philippines. The point-of-sale data suggest that canned tuna consumption is composed mostly of tuna in sauce with vegetables followed by tuna in oil and tuna in sauce without vegetables. For both high- and low-income groups, the expenditure elasticities have the expected positive signs – indicating that as the income of consumers’ increases, the quantity demanded for canned tuna in three product mediums also increases. For high-income consumers, consumption of tuna in sauce with and without vegetables is more responsive to income changes. The own-price elasticities of the three product mediums across high- and low-income store branches have negative signs – suggesting that as their own price increases, the quantity demanded for these products decreases. The cross-price elasticities suggest that tuna in sauce with vegetables is a substitute for tuna in oil and in sauce without vegetables for both income groups. Thus, promoting more use of vegetables through product development may lead to a lower volume of tuna meat used in canned tuna products, which contributes to addressing tuna resource sustainability

An Outbreak Investigation of Scombrotoxin Fish Poisoning Illnesses in the United States Linked to Yellowfin Tuna Imported from Vietnam—2019

Scombrotoxin fish poisoning (SFP) is caused by the ingestion of certain fish species with elevated concentrations of histamine due to decomposition. In fall 2019, the U.S. Food and Drug Administration (FDA) was notified of 51 SFP cases including two hospitalizations from 11 states through the FDA consumer complaint system or directly from state partners. A case patient was defined as an individual who experienced a histamine-type reaction after consumption of tuna imported from Vietnam and an illness onset between 14 August and 24 November 2019. A traceback investigation was initiated at 19 points of service to identify a common tuna source. The FDA and state partners collected 34 product samples throughout the distribution chain, including from a case patient's home, points of service, distributors, and the port of entry. Samples were analyzed for histamine by sensory evaluation and/or chemical testing. Case patients reported exposure to tuna imported from Vietnam. The traceback investigation identified two Vietnamese manufacturers as the sources of the tuna. Twenty-nine samples were confirmed as decomposed by sensory evaluation and/or were positive for elevated histamine concentrations by chemical testing. Both Vietnamese companies were placed on an import alert. Seven U.S. companies and one Vietnamese company initiated voluntary recalls. The FDA released public communication naming the U.S. importers to help suppliers and distributors identify the product and effectuate the foreign company's recall. This SFP outbreak investigation highlights the complexities of the federal outbreak response, specifically related to imported food. Cultural considerations regarding imported foods should be addressed during outbreak responses when timing is critical. Collaboration with countries where confidentiality agreements are not in place can limit information sharing and the speed of public health responses.

The Length-Weight Relationship and Condition Factors of Bullet Tuna Landed at the Tanjung Luar Fishing Port, Indonesia

HighlightBullet tuna (Auxis rochei Risso 1810) has been identified (measured, weighed) and analyzed.The resource status of bullet tuna has been estimated based on body shape and age group.LWR curve is implemented to describe and express the age group of bullet tuna (immature, adult/mature, old)This study has resulted the composition and ratio of bullet tuna that is suitable to be caught, fit for consumption and worthy of maturationAbstractBullet tuna (Auxis rochei Risso 1810) or tongkol lisong (Indonesian) is important for human consumption and health as well as an income source for fishers and coastal communities. Its utilization problems are over exploitation, catch domination by immature groups, and the threatened stock security of the bullet tuna (BLT). This research aimed to determine the status of the prospective parent of bullet tuna caught in the Lesser Sunda region, particularly from the Alas Strait to the Indian Ocean, West Nusa Tenggara (WNT). Meanwhile, the data were collected from July to September 2020 (2nd transitional season) at the Tanjung Luar Fishing Port, East Lombok and a dependent survey method was adopted with sampling, interview, observation, and documentation techniques. Fork length and body weight data were used to estimate the length and weight relationship, growth pattern, condition factor, fish age group, and catch worth. The primary and secondary data were processed quantitatively using several equations. The growth pattern of bullet tuna was minor allometric (b = 2.875), worth selling (K > 1.00), and the majority was adult fish or mature group. The LWR model is . This condition indicates the bullet tuna is worth catching and worth spawning, so that it is eligible to be a potential broodstock candidate to support a sustainable management of BLT fisheries. Furthermore, fishers have applied the code of conduct for responsible fisheries (CCRF) in supporting the sustainable development goals.

Maximum Consumption Limits of Fish Catches Tainted by Lead (Pb) in 3 Fish Auction Markets (FAM) in Cilacap, Indonesia

Heavy metals produced by the industrial sector in Cilacap will contaminate the waters and impact the organisms in them, which will affect the condition of humans as consumers. The purpose of the importance of this research activity is to compare the type of fish and the value of heavy metal Pb with the quality standards of the Ministry of Environment No.51 of 2004, BPOM Regulation 2009 and SNI 7387 of 2009, as well as knowing the maximum consumption limit of consumption fish catches to control the pattern eat fish indicated heavy metals. The method used is a comparative description with survey techniques in 3 locations where fish auctions (FAM) and Pb level analysis using the AAS method. The types of fish with the highest level of consumption in Cilacap are kembung, tuna and tongkol. The Pb level of kembung, tuna and tongkol passes the threshold> 0.4 ppm from SNI 7387-2009 and BPOM 2009, namely 0.7 ppm, 2.9 ppm, and 2.3 ppm, respectively so it is essential to have a consumption limit per week through Tolerable Maximum Intake (MTI) with categories for adults and children for the consumption of each type of fish consumption. Research shows that the maximum consumption limit for adults in kembung, tuna and tongkol is 16.9 kg, 2.8 kg, and 9.2 kg, respectively. Meanwhile, the maximum limit of consumption of kembung, tuna and tongkol for children is 6.4 kg, 1 kg, and 2.9 kg, respectively.

Batas aman konsumsi ikan tongkol Pasar Dupa Pekanbaru ditinjau dari kandungan logam Pb dan Cu

Based on toxicology viewpoint, heavy metals can be divided into 2 types. The first type is essential heavy metals, which is in a certain amount is needed by living organisms, but in excessive amounts can cause toxic effects, such as Zn, Cu, Fe, Co and Mn. The second type is non-essential, which is in the organism body is still not known the benefit of this heavy metals even it can be become a toxic in our body, such as Hg, Cd, Pb and Cr.The purpose of this research is to 1) analyzing the concentration of heavy metals Pb and Cu on the tuna fish which is sold in the Dupa Market Pekanbaru, and 2)analyzing the content of heavy metals Pb and Cu on Tuna,whether it has exceeded or not the threshold of SNI 2009. The study has been conducted in June to July 2015 in Dupa Market Pekanbaru City. The method used in this study is a survey method. The result showed that heavy metals Pb and Cu have the highest metal content are derived from Sibolga waters. The heavy metals content of tuna in Dupa Market of Pekanbaru were Pb of 1 – 3.98 ug/g and Cu of 0.22 - 0.93 ug/g,. The Safety limit consumption of tuna in Dupa Market Pekanbaru are Pb of 3.89 kg/week and Cu of 2456.76 kg/week. Based on this results showed the status for heavy metals of Pb and Cu on Tuna fish that sold at Dupa Market Pekanbaru is still safe and consumable.

Probable association between Anisakis infection in the muscle of skipjack tuna (Katsuwonus pelamis) and human anisakiasis in Tokyo, Japan

Anisakiasis is a gastrointestinal disease caused by parasitic anisakid nematodes, mainly Anisakis simplex sensu stricto (A. simplex). Anisakiasis is prevalent in Japan and approximately 40% of anisakiasis cases in Tokyo occur through the consumption of raw or marinated mackerel. However, in 2018, there was a sudden increase in the number of the food poisoning cases in Tokyo caused by consumption of skipjack tuna (Katsuwonus pelamis). Therefore, we investigated anisakiasis cases resulting from ingestion of skipjack tuna in Tokyo, and surveyed the presence of Anisakis larvae in skipjack tuna in 2018 and 2019. Nineteen samples from 15 patients (13 in 2018 and 2 in 2019) with anisakiasis surely caused by ingestion of skipjack tuna were all identified as A. simplex. The higher mean abundance of Anisakis simplex larvae in skipjack tuna muscle in May 2018 (1.30; 13 larvae/10 fishes) compared to that in the other periods was regarded as a contributing factor in the increase in anisakiasis cases by ingesting skipjack tuna in 2018. To verify whether Anisakis larvae migrate from the visceral organs to the muscle during the period from fishing on the boat until processing for sale, the number of Anisakis larvae in skipjack tuna caught from August to November 2018 was investigated by removing the visceral organs at three different timings, i.e., immediately after catching, after landing, and after transport to the laboratory. Anisakis larvae were detected in the muscle irrespective of the timings at which visceral organs were removed. All larvae from the muscle were detected only from the ventral part and were identified as A. simplex. We thus consider that avoiding raw consumption of the ventral muscle should be an effective measure to prevent anisakiasis.