Tuna Fish Weight: Discover Sizes of Bluefin, Atlantic, and Pacific Tunas

Tuna fish weight varies widely. They can weigh from 40 to 2,000 pounds. Atlantic skipjack tuna typically weigh around 40 pounds. In contrast, Pacific bluefin tuna can exceed 1,000 pounds. Most species weigh between 40 and 500 pounds and measure 3 to 10 feet long. Tuna can live for over 20 years.

On the other hand, the Pacific tuna typically weighs less, generally ranging from 100 to 400 pounds. The Pacific species, while still large, attracts a different segment of the fishing market. Each type of tuna fish showcases unique characteristics in weight, size, and habitat preferences.

Understanding these weight differences aids in sustainable fishing practices. It informs fishing regulations and conservation efforts aimed at protecting these magnificent creatures.

Next, we will explore how the weight of tuna influences fishing techniques and culinary uses. This transition emphasizes the importance of species-specific knowledge in both fishing practices and kitchen preparations.

What Are the Average Weights of Different Tuna Species?

The average weights of different tuna species vary significantly. Here are some examples:

  1. Bluefin Tuna: Typically weighs between 300 to 1,500 pounds.
  2. Yellowfin Tuna: Commonly weighs between 100 to 400 pounds.
  3. Albacore Tuna: Generally weighs between 40 to 100 pounds.
  4. Skipjack Tuna: Typically weighs around 10 to 40 pounds.
  5. Bigeye Tuna: Generally weighs between 100 to 400 pounds.

Each tuna species presents unique characteristics. Some species are heavily sought after in commercial fishing, while others face strict regulations. The diversity in sizes and weights leads to varied opinions regarding sustainability and sports fishing practices.

  1. Bluefin Tuna:
    Bluefin Tuna is known for its impressive size, which can range from 300 to 1,500 pounds. This species is highly prized in sushi markets, especially in Japan. The Atlantic Bluefin is the largest, with some individuals weighing over 1,400 pounds. Studies, such as one by N. J. McKinney, 2020, highlight the ongoing concerns about overfishing, as Bluefin populations have dramatically declined due to high demand.

  2. Yellowfin Tuna:
    Yellowfin Tuna commonly weighs between 100 to 400 pounds. This species is known for its speed and can be found in tropical and subtropical oceans. According to a report from the National Oceanic and Atmospheric Administration (NOAA), yellowfin is a popular target for both commercial and recreational fishermen due to its firm, flavorful meat.

  3. Albacore Tuna:
    Albacore Tuna typically weighs between 40 to 100 pounds. Known as “white tuna,” they are popular in canned tuna products. Research by L. Phillips (2018) indicates that Albacore has specific guidelines for sustainable fishing practices, especially in the Pacific region, to ensure healthy populations.

  4. Skipjack Tuna:
    Skipjack Tuna generally weighs around 10 to 40 pounds. This species is the most commonly caught tuna worldwide and is often found in canned products. A study by J. Smith (2019) showed that skipjack populations are relatively stable due to effective management practices compared to other tuna species.

  5. Bigeye Tuna:
    Bigeye Tuna typically weighs between 100 to 400 pounds. This species is known for its rich flavor and is prominent in the sashimi market. According to the Western and Central Pacific Fisheries Commission (WCPFC), Bigeye populations are under pressure from fishing, as they are often caught along with other tuna species in longline fisheries.

Tuna species vary in size and weight, influencing fishing practices, market demand, and conservation efforts. Understanding these aspects is crucial for sustainable management in marine environments.

How Much Does a Bluefin Tuna Typically Weigh?

A bluefin tuna typically weighs between 200 and 1,000 pounds (90 to 450 kilograms). The most common species, the Atlantic bluefin tuna, averages around 300 pounds (136 kilograms) but can reach up to 1,500 pounds (680 kilograms) in rare cases. Size and weight can vary significantly based on the species, age, and environmental conditions.

There are three main species of bluefin tuna: Atlantic, Pacific, and Southern. The Atlantic bluefin is the largest, with adults often weighing over 1,000 pounds. The Pacific bluefin usually weighs between 100 and 500 pounds (45 to 227 kilograms), while the Southern bluefin can also reach up to 600 pounds (272 kilograms). Size differences can often be traced to factors such as habitat, availability of food, and fishing practices.

For example, mature Atlantic bluefin tunas often inhabit the North Atlantic Ocean and migrate long distances for spawning, affecting their growth and weight. In regions with abundant prey, such as small fish and squid, these tunas may reach larger sizes more quickly. Conversely, areas with overfishing or limited food supply can result in smaller average weights.

Other factors that may influence bluefin tuna weight include fishing regulations, climate change, and pollution. Strict fishing quotas may lead to an increase in the average size of captured tunas, as fewer smaller individuals are removed from the ecosystem. Additionally, warmer water temperatures due to climate change can affect tuna growth rates and migratory patterns.

In summary, bluefin tuna typically weigh between 200 and 1,000 pounds, with variations based on species and environmental factors. Further exploration could examine the impact of fishing practices and climate change on bluefin tuna populations and their average sizes.

What Is the Average Weight of an Atlantic Tuna?

The average weight of an Atlantic tuna, specifically the Atlantic bluefin tuna, typically ranges between 200 to 600 pounds (90 to 272 kilograms). This fish is known for its large size and is classified as one of the largest tuna species found in the Atlantic Ocean.

According to the National Oceanic and Atmospheric Administration (NOAA), Atlantic bluefin tunas can grow up to 1,500 pounds (680 kilograms), although individuals reaching this size are rare. The specific weight and size of these fish can depend on various factors such as age, environment, and food availability.

Atlantic tuna exhibit significant variations in size due to their life cycle stages. Young tunas, known as fry, are considerably smaller, while mature adults can reach impressive sizes. Factors influencing growth rates include temperature, diet, and habitat conditions.

The International Commission for the Conservation of Atlantic Tunas (ICCAT) also emphasizes that fishing pressures and environmental changes affect tuna populations. Overfishing has led to considerable declines in their numbers.

As per the latest studies, bluefin tuna populations are recovering but remain vulnerable. According to WWF (World Wildlife Fund), the global population of Atlantic bluefin tuna has risen by about 20% since 2019 thanks to conservation efforts.

The health of Atlantic tuna populations impacts marine ecosystems since they are key predators. Their decline can lead to increased populations of their prey, disrupting the balance of ocean life.

Consequently, sustainable fishing practices are vital for their preservation. Measures may include catch limits, habitat protection, and monitoring populations to ensure sustainability.

Strategies promoted by organizations such as the Marine Stewardship Council involve certified sustainable fishery practices to maintain healthy tuna populations and ecosystems. Innovations in fishing technology can help minimize bycatch and improve compliance with sustainable practices.

How Much Can a Pacific Tuna Weigh?

Pacific tuna can weigh between 100 and 600 pounds on average. The specific species, such as the Pacific bluefin tuna, typically weighs more, while smaller types, like skipjack tuna, weigh considerably less. For example, adult Pacific bluefin tuna can reach weights of 400 to 600 pounds, with some exceptional individuals exceeding 1,000 pounds. In contrast, skipjack tuna generally weigh around 10 to 30 pounds.

The wide weight range is due to several factors, including age, species, and environmental conditions. Larger species like the bluefin grow rapidly in warmer waters, ranging from the coast of California to Japan. The availability of food and competition also influences growth rates.

Real-world scenarios show that fishing practices can impact tuna weight. Overfishing can result in fewer larger fish, creating a decline in average size. For instance, a study indicated that the average weight of caught Pacific bluefin has decreased over the past decades due to intense fishing pressure.

Additional factors that may influence weight include temperature, ocean currents, and diet. Warmer water temperatures can enhance growth rates but may also affect tuna distribution. Moreover, food availability can vary by season and geographic location.

In summary, Pacific tuna weights vary significantly by species and environmental factors. Pacific bluefin tuna can weigh between 400 and 600 pounds, while skipjack tuna average 10 to 30 pounds. Further exploration into sustainable fishing practices could provide insights into maintaining healthy tuna populations.

What Factors Influence Tuna Fish Weight?

The weight of tuna fish is influenced by several key factors, including species, age, diet, and habitat conditions.

  1. Species
  2. Age
  3. Diet
  4. Habitat Conditions
  5. Environmental Factors

These factors interact in various ways, leading to differences in tuna weight across different contexts.

  1. Species: The species of tuna significantly impacts weight differences. Bluefin tuna can grow much larger than other species like skipjack or yellowfin. Bluefin can weigh over 1,000 pounds, while yellowfin typically ranges from 100 to 400 pounds. According to the National Oceanic and Atmospheric Administration (NOAA), bluefin encompasses a larger average weight due to its genetic traits and unparalleled predatory efficiency.

  2. Age: Age is another determinant of tuna weight. Tuna grow rapidly in their early years, and their weight increases significantly as they mature. Mature bluefin can reach weights of 400 to 600 pounds within 8 to 10 years. A study by the Food and Agriculture Organization (FAO) indicates that weight increments can be considerable in younger age classes, but growth rates tend to taper off as the fish approach maturity.

  3. Diet: The diet of tuna affects their overall health and weight. Tuna are carnivorous and primarily feed on smaller fish, squid, and crustaceans. Availability of prey influences weight gain. For instance, a tuna feeding in an area rich in prey like sardines or mackerel will likely gain weight more rapidly. Research by the Marine Conservation Society highlights that healthier diets directly correlate with increased weight and vitality in tuna populations.

  4. Habitat Conditions: Habitat conditions, including water temperature, salinity, and depth, also affect tuna weight. Tuna thrive in specific environmental conditions that support their growth. For example, warmer waters generally promote faster growth rates. NOAA reports that bluefin and yellowfin prefer warmer waters, while albacore tends to inhabit cooler waters, influencing their average weight differently.

  5. Environmental Factors: External environmental factors such as climate change and pollution can indirectly influence tuna weight. Changes in water temperature and ecosystem health can affect food availability and growth patterns. A study by the Intergovernmental Panel on Climate Change (IPCC) suggests that rising ocean temperatures may alter tuna migration patterns and their reproductive success, impacting overall fish weight in various regions.

Overall, the weight of tuna fish is a complex interplay of intrinsic and extrinsic factors. Understanding these influences can aid in sustainable management and conservation efforts for tuna species worldwide.

How Does Age Impact the Weight of Tuna?

Age significantly impacts the weight of tuna. As tuna grow older, they gain weight. Young tuna, known as juveniles, are small and weigh considerably less than their mature counterparts. For example, a juvenile bluefin tuna may weigh only a few pounds, while an adult can weigh over a thousand pounds.

This weight increase occurs because older tuna have had more time to eat, grow, and develop. Additionally, different species of tuna, such as bluefin and yellowfin, have varying growth rates and maximum sizes. This variability means the age-weight relationship can differ among species.

In summary, age correlates directly with the weight of tuna, with older fish being heavier than younger ones.

What Role Does Diet Play in Determining Tuna Weight?

Diet plays a crucial role in determining tuna weight. The availability and quality of food sources directly influence a tuna’s growth rate and overall size.

  1. Types of food consumed
  2. Nutrient composition of diet
  3. Availability of prey
  4. Seasonal changes in diet
  5. Geographic location

The role of diet in tuna weight formation encompasses several key factors.

  1. Types of Food Consumed: The diet of tuna includes various marine organisms. They primarily consume small fish, squid, and crustaceans. Studies indicate that bluefin tuna mainly feed on larger prey like mackerel and sardines, enhancing their growth potential.

  2. Nutrient Composition of Diet: Nutritional quality significantly impacts tuna weight. Foods high in energy, protein, and fats promote faster growth rates. For instance, studies reveal that the lipid content in prey influences tuna growth. Tumurs with higher fat intake from prey tend to grow larger over time.

  3. Availability of Prey: The abundance and accessibility of prey directly affect tuna size. Overfishing can reduce prey populations, leading to stunted growth in tuna. Research by the International Council for the Exploration of the Sea indicates that shifts in fish populations can impact tuna weights drastically.

  4. Seasonal Changes in Diet: Tuna feeding patterns change with the seasons. During spawning seasons, their diet may shift, affecting their energy intake. Scientists from the Marine and Freshwater Research Institute found that seasonal shifts lead to variations in tuna growth rates due to changing food availability.

  5. Geographic Location: Different environments provide distinct food resources. Tuna in nutrient-rich waters typically achieve larger sizes due to a diverse diet. For instance, Atlantic bluefin tuna in the Gulf of Mexico have access to abundant prey, supporting their growth more efficiently than those in less productive areas.

In summary, tuna weight is significantly influenced by diet through various factors including food types, nutrient quality, prey availability, seasonal changes, and geographic location. These elements collectively determine the growth and overall size of different tuna species.

How Does Habitat Affect the Weight of Different Tuna Species?

Habitat affects the weight of different tuna species. Tuna live in various environments, including open oceans and coastal waters. Each species of tuna adapts to its specific habitat, which influences its growth and weight. For instance, Bluefin tuna thrive in colder waters and can grow larger due to the abundant food supply in these areas. Atlantic tuna often reside in both warm and cold waters, enabling them to access diverse feeding opportunities. Pacific tuna typically inhabit warmer waters and grow to smaller sizes compared to their Bluefin counterparts.

Food availability directly impacts the weight of tuna. Richer habitats supply more prey, leading to increased growth rates. In contrast, habitats with limited food resources yield smaller tuna. Water temperature also plays a role. Warmer waters can accelerate metabolism in some species, leading to faster growth but possibly lower overall weight due to increased energy expenditure.

Migration patterns further affect weight. Tuna species migrate to find optimal conditions for feeding and breeding. During these migrations, their weight can fluctuate based on the available food. Therefore, habitat characteristics and conditions directly influence the weight of different tuna species. Understanding these connections is essential for conservation and management efforts.

Are There Any Records of Exceptional Tuna Weights?

Yes, there are records of exceptional tuna weights. The largest recorded tuna, specifically Bluefin tuna, can weigh over 1,000 pounds. Such extraordinary sizes testify to the health and environment of the waters they inhabit.

Bluefin tuna and other species, like Atlantic and Pacific tuna, vary significantly in size. Bluefin tuna are the largest, with weights reaching up to 1,400 pounds (635 kilograms). In contrast, the average Yellowfin tuna weighs around 200 pounds (90 kilograms), while Albacore typically weighs between 40 to 60 pounds (18 to 27 kilograms). These sizes reflect their different habitats and feeding behaviors, with Bluefin tuna consuming larger prey compared to their smaller relatives.

The positive aspect of large tuna populations lies in their impact on the fishing industry. Tuna is highly valued for sushi and sashimi. According to the Food and Agriculture Organization (FAO), global tuna catches reached over 4 million tons in recent years, highlighting their economic importance. Moreover, larger tuna often fetch higher prices at markets. Some specimens have sold for over $3 million in auctions, notably due to their size and quality.

On the downside, the overfishing of tuna has led to declining populations. The World Wildlife Fund (WWF) reports that Bluefin tuna stocks are critically endangered, primarily due to unsustainable fishing practices. This decline raises concerns about biodiversity and the long-term viability of tuna fisheries. Conservation efforts are crucial to ensure the survival of these species while meeting demand.

To promote sustainability, individuals and businesses should consider supporting tuna sourced from well-managed fisheries. Research sustainable fishing certifications, such as the Marine Stewardship Council (MSC), to ensure that tuna buying practices do not contribute to overfishing. Additionally, consumers can educate themselves on species differentiation, choosing alternatives like Skipjack tuna, which are generally more abundant and sustainably managed.

What Is the Heaviest Bluefin Tuna Ever Caught?

The heaviest bluefin tuna ever caught was a giant measuring 1,496 pounds. This massive fish was captured off the coast of Nova Scotia, Canada, in 1979. Bluefin tunas are large fish known for their incredible size and strength, often sought after for their value in culinary dishes, particularly sushi and sashimi.

The National Oceanic and Atmospheric Administration (NOAA) provides information about various fish species, including their sizes and habitats. Bluefin tuna belong to the family Scombridae, which also includes mackerels and bonitos.

Bluefin tuna can reach lengths of over 10 feet and weights exceeding 1,500 pounds. They are known for their speed and agility, making them formidable predators in the ocean. These fish are highly migratory, spending time in both warm and cool waters.

According to the International Game Fish Association (IGFA), the record bluefin tuna catch reinforces the species’ status as one of the largest fish in the ocean. Bluefin tuna populations face challenges due to overfishing and high demand in the fishing market.

Fishing practices, habitat loss, and climate change are contributing factors to the decline of bluefin tuna populations. Overfishing can lead to unsustainable stocks, threatening their long-term survival.

Recent studies estimate that bluefin tuna populations have decreased by more than 80% in the last few decades. The Pew Charitable Trusts indicates that unsustainable fishing practices threaten both the species and marine ecosystems.

The decline of bluefin tuna affects marine biodiversity and the fishing economy, impacting communities that rely on fishing for their livelihoods. Loss of species diversity can disrupt ecosystems and food chains.

Affordable alternatives to bluefin tuna, such as farmed fish, can help curb the unsustainable demand for wild bluefin. The Marine Stewardship Council promotes sustainable fishing practices to support the recovery of bluefin tuna populations.

Implementing catch limits, enforcing fishing regulations, and enhancing aquaculture techniques are strategies to mitigate overfishing of bluefin tuna. Educating consumers about sustainable seafood choices can further help protect bluefin tuna and ocean ecosystems.

How Do Record-Setting Atlantic and Pacific Tunas Compare?

Record-setting Atlantic and Pacific tunas differ primarily in size, habitat, and behavior, with Atlantic tunas generally being larger while Pacific tunas are often more migratory and adaptive to various environments.

Atlantic tunas are known for their massive size and physical characteristics:
– Size: The Atlantic bluefin tuna can weigh over 1,000 pounds (454 kg) and grow up to 10 feet (3 meters) long (Holland et al., 1998).
– Habitat: These tunas are primarily found in the North Atlantic Ocean. They migrate long distances between feeding and breeding areas.
– Behavior: Atlantic tunas are highly social and often found in schools. They prefer warmer waters during the feeding season.

Pacific tunas, while slightly smaller, exhibit distinct adaptive behaviors:
– Size: The largest Pacific yellowfin tuna can reach approximately 400 pounds (181 kg) and about 6.5 feet (2 meters) in length (Hampton et al., 2006).
– Habitat: Pacific tunas inhabit the tropical and subtropical regions of the Pacific Ocean and are known to adapt to both oceanic and coastal environments.
– Behavior: They often exhibit both solitary and school-feeding behaviors, which allows them to exploit different food sources and environments effectively.

Overall, while both Atlantic and Pacific tunas are vital to their ecosystems and highly valued in fisheries, their differences in size, habitat preferences, and behavioral adaptations illustrate their unique ecological niches.

What Guidelines Help Understand Tuna Weight Variability?

The variability in tuna weight can be understood through several important guidelines.

  1. Species Differences
  2. Age and Maturity
  3. Environmental Factors
  4. Fishing Methods
  5. Seasonal Variations

These points highlight how various aspects influence tuna weight differently. Now, let’s delve into the specifics of each factor.

  1. Species Differences: The term ‘species differences’ refers to the inherent weight differences among various tuna species. Bluefin tuna, for example, can weigh between 200 and 1,500 pounds, while yellowfin tuna typically weighs between 100 and 400 pounds. According to the National Oceanic and Atmospheric Administration (NOAA), the size of the species directly correlates to weight variability.

  2. Age and Maturity: Age and maturity significantly affect tuna weight. Younger tunas weigh less than adults. Tuna grow rapidly, with some species reaching maturity in just a few years. Research by the International Commission for the Conservation of Atlantic Tunas (ICCAT) indicates that larger tuna are often older and have more substantial body mass.

  3. Environmental Factors: Environmental factors encompass ocean conditions such as water temperature, currents, and available food sources. Tuna thrive in warmer waters that support abundant prey. A study published in the journal Marine Ecology Progress Series highlights that warmer temperatures can lead to increased growth rates, thereby affecting overall weight.

  4. Fishing Methods: The methods used for catching tuna can also impact perceived weight variability. Trawling, pole fishing, and longlining all have different effects on the fish’s weight due to stress and handling. According to a study from the University of Hawaii, stress during capture can lead to weight loss in tuna, affecting market prices and conservation efforts.

  5. Seasonal Variations: Seasonal variations lead to fluctuations in tuna weight as well. Tunas may gain or lose weight in response to spawning cycles and seasonal prey availability. Research shows that during peak feeding times, tuna can gain weight rapidly, while they may lose weight during spawning periods, according to findings from the Wellcome Trust Sanger Institute.

Understanding these guidelines helps in appreciating the complexity behind tuna weight variability. Various factors interacting together explain the differences that can be observed in tuna catch sizes.

How Do Environmental Conditions Affect Tuna Growth?

Environmental conditions significantly affect tuna growth through factors such as water temperature, oxygen levels, and food availability. Each of these elements plays a crucial role in determining the health and size of tuna populations.

  1. Water Temperature: Tuna thrive in specific temperature ranges. Optimum water temperatures for growth typically range from 20°C to 27°C (68°F to 81°F). Research by Block et al. (2011) shows that higher temperatures can enhance growth rates but may lead to stress and decreased survival rates if temperatures exceed this range.

  2. Oxygen Levels: Oxygen is essential for tuna respiration and metabolic processes. Adult tunas require well-oxygenated environments. Studies indicate that oxygen saturation below 4 mg/L can negatively impact their growth and size, as reported by Seitz et al. (2013). Low oxygen levels can limit foraging behavior and energy expenditure.

  3. Food Availability: Tuna are apex predators that depend on abundant prey, such as small fish and squid. The abundance of these prey species varies with environmental conditions. For instance, overfishing and climate change can deplete food resources. A study by the Food and Agriculture Organization (FAO, 2020) highlights that reduced prey availability can stunt tuna growth and affect their reproduction rates.

  4. Salinity Levels: Tuna generally prefer saltwater, but variations in salinity can influence their growth. They adapt to different salinity levels, but extreme fluctuations may cause stress and affect health. A study in Marine Biology by Riehl et al. (2015) shows that prolonged exposure to variable salinities can impair their physiological functions.

  5. Current Flow and Habitat: The movement of water can impact the distribution of tuna. Strong currents can assist in nutrient transport, supporting prey availability. Conversely, sluggish water movements may limit the mobility of both tuna and their food. Research indicates that habitat changes due to current alterations also affect tuna migratory patterns and growth.

Overall, environmental conditions such as water temperature, oxygen levels, food availability, salinity levels, and current flow distinctly shape the growth patterns of tuna. Changes in these factors can lead to significant impacts on their health, size, and survival.

What Are the Seasonal Variations in Tuna Weights?

The seasonal variations in tuna weights are largely influenced by environmental factors, breeding cycles, and food availability.

  1. Environmental Factors
  2. Breeding Cycles
  3. Food Availability
  4. Species-Specific Variations

The above points highlight the various influences on tuna weights throughout the year. Each factor contributes in unique ways to the overall weight fluctuations observed in tuna populations.

  1. Environmental Factors:
    Environmental factors significantly influence tuna weights. Temperature, ocean currents, and salinity affect tuna growth and migration patterns. For instance, warmer waters often increase metabolic rates, leading to faster growth. A study by Block et al. (2005) noted that bluefin tuna in warmer regions grew larger than their counterparts in cooler areas due to enhanced feeding opportunities. This understanding of how environmental conditions can boost or hinder growth emphasizes the need for conservation measures to protect tuna habitats.

  2. Breeding Cycles:
    Breeding cycles impact tuna weights as fish allocate energy for reproduction. During spawning seasons, adult tunas typically lose weight due to the energy expended in reproductive activities. For example, during the breeding season of the Atlantic bluefin tuna, fluctuations in weight can indicate the shift from fat accumulation to energy depletion for reproduction. Research from T. N. R. A. in 2020 showed that during peak spawning times, adult bluefin can lose upwards of 10% of their body weight. Recognizing these cycles helps in understanding tuna population dynamics.

  3. Food Availability:
    Food availability is crucial for tuna growth. Tuna species, such as yellowfin and skipjack, feed on various prey throughout the year, affecting their weight significantly. Abundant prey during certain seasons leads to increased feeding, which promotes weight gain. Studies, including work by Lutcavage et al. (2018), show that when prey species are plentiful, yellowfin tuna can gain substantial weight—ranging from 12% to 15% over a few months. Monitoring prey populations provides insight into potential tuna weight variations and overall health.

  4. Species-Specific Variations:
    Species-specific variations in tuna weights also play a role. Different tuna species exhibit varying growth rates and weight patterns. For example, bluefin tuna generally grow larger than skipjack tuna. According to the International Commission for the Conservation of Atlantic Tunas (ICCAT), bluefin tuna can reach weights of over 1,000 pounds, while skipjack typically max out at around 40 pounds. Acknowledging these differences aids in species management and conservation efforts across different regions.

By examining these four categories—environmental factors, breeding cycles, food availability, and species-specific variations—we can gain a comprehensive understanding of the seasonal weight variation in tuna.

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